Gas Water Heater Guides | Water Heater Answers

5 Flashes on a Water Heater: What It Means

Five status-light flashes means different faults on different gas controls. Manufacturer-verified meanings for Bradford White, Rheem and A. O. Smith.

Continue reading →No hot water

Apartment Water Heater Not Hot Enough: Tenant Checks

Why apartment hot water is only lukewarm, what a tenant can check without touching the heater, and how to report it so the right repair gets made.

Continue reading →Leaks and flooding

Apartment Water Heater Not Working: Tenant Steps

What a tenant can safely check when the apartment water heater stops working or leaks, how to limit damage, and what to report to the landlord.

Continue reading →No hot water

Brand New Water Heater Has No Hot Water

A newly installed tank with no hot water usually has a startup problem: a closed valve, no power or gas, a dry-fired element, or a plumbing mix-up.

Continue reading →Pilot and ignition problems

Brand New Water Heater Making Popping Noises

Popping or ticking from a new water heater: air, pipe expansion, condensation on a gas burner, or a delayed-ignition bang that needs a technician.

Continue reading →No hot water

Brand New Water Heater Only Gives Warm Water

A newly installed water heater making only lukewarm water: how to tell a mixing or plumbing issue from a heater fault, and what the installer checks.

Continue reading →Gas

Broken Water Heater Sight Glass: Is It Safe to Use?

The sight glass on a gas water heater's inner door is part of the sealed combustion chamber. Why a cracked one means shutting the heater off.

Continue reading →Gas, burning, and sulfur smells

Can a Water Heater Leak Carbon Monoxide?

How a gas water heater can put carbon monoxide into a home, the warning signs, what to do if a CO alarm sounds, and what the technician will check.

Continue reading →Pilot and ignition problems

Can You Manually Light an Electronic-Ignition Water Heater?

Why you can't light an electronic-ignition water heater with a match or lighter, how to tell which ignition you have, and what to do when it won't light.

Continue reading →No hot water

Can You Still Use Water If the Water Heater Is Leaking?

Yes for cold water, once the heater's cold inlet is closed. Why running hot water feeds the leak, how to isolate the heater, and which leaks can wait.

Continue reading →Pilot and ignition problems

Don't Purge a Water Heater Gas Line Yourself

Do not open gas fittings to release air. Learn what to do after a failed installation start and when gas odor requires immediate evacuation.

Continue reading →Pilot and ignition problems

Eco-Defender Water Heater Won't Turn On

Why a Bradford White Eco-Defender (Defender Safety System) gas heater won't fire: pilot out, safety shutdown, lint-blocked air supply, or a control fault.

Continue reading →Leaks and flooding

Expansion Tank Full of Water: Failed Bladder Signs

How to tell an expansion tank has waterlogged, why it makes the T&P valve drip, and why adding air does not fix a failed bladder.

Continue reading →Leaks and flooding

Expansion Tank Pinhole Leak: What It Means

A pinhole or rust weep on an expansion tank shell means the tank needs replacing. How to confirm the source and limit water damage until it's swapped.

Continue reading →Error codes and flashing lights

Flashing Green Light on a Water Heater: What It Means

A single slow flash on a gas water heater control is usually normal standby. How to tell normal status patterns from fault codes, with sources.

Continue reading →Gas

Gas Power-Vent Water Heater Problems

Why a power-vent gas water heater won't start or keeps shutting down: power, blocked vents, blower, and pressure-switch faults, and what is safe to check.

Continue reading →Gas, burning, and sulfur smells

Gas Smell After Water Heater Replacement

A gas smell after a new water heater is installed should be treated as a leak. What to do, how to tell it from first-fire odors, and who checks it.

Continue reading →Pilot and ignition problems

Gas Valve Electronic Fault Detected: What It Means

On Bradford White heaters with a Honeywell gas control, seven flashes means a gas control electronic fault. What causes it and what a reset can fix.

Continue reading →Pilot and ignition problems

Gas Water Heater Burner Not Lighting at All

When a gas water heater shows no flame at all, the cause is usually gas supply, the control setting, the igniter, or a safety lockout. What to check first.

Continue reading →No hot water

Gas Water Heater Burner On but No Hot Water

The main burner fires but taps stay cold or lukewarm. How a dip tube, mixing valve, closed valve, crossover, or sediment causes it, and what to check.

Continue reading →Pilot and ignition problems

Gas Water Heater Burner Won't Stay Lit

The main burner lights and then goes out. How weak thermopiles, starved combustion air, gas supply, and safety switches cause it, and what to check.

Continue reading →Error codes and flashing lights

Gas Water Heater Error Codes and Flashing Lights

Why gas water heater flash codes differ by brand and control, how to read and record yours, and links to brand-specific code guides.

Continue reading →Leaks and flooding

Gas Water Heater Got Wet and the Pilot Won't Light

After a flood, a burst pipe, or water dripping onto the burner, a gas water heater needs inspection before relighting. Why, and what to do.

Continue reading →Gas

Gas Water Heater Not Getting Gas: What to Check

When a gas water heater gets no gas, the cause is often a closed valve, an empty propane tank, or a utility shutoff. What to check and what to leave alone.

Continue reading →Pilot and ignition problems

Gas Water Heater Not Working After a Power Outage

Whether a gas water heater needs electricity depends on its ignition and venting. What to check when it stays cold after an outage.

Continue reading →Pilot and ignition problems

Gas Water Heater Not Working After Rain

Rain can reach a gas water heater through the vent, a missing cap, or an outdoor cabinet. How to spot it, and why not to relight a wet burner.

Continue reading →Gas

Gas Water Heater Thermal Switch Keeps Tripping

A thermal or rollout switch that keeps tripping means heat is escaping where it shouldn't. Common causes, what to check, and why not to bypass it.

Continue reading →Gas

Gas Water Heater Thermal Switch Won't Reset

A gas water heater thermal or rollout switch that won't reset is still hot, has failed, or is still seeing the overheat that tripped it. What it means.

Continue reading →Leaks and flooding

Hot Water Smells Like Rotten Eggs: Causes and Fixes

Why hot water from a tank smells like rotten eggs, how to tell it from a gas leak, and the fixes manufacturers list: chlorination and a different anode.

Continue reading →Troubleshooting

How Long Do Water Heaters Last? Tank, Tankless, Heat Pump

Expected life of tank, tankless and heat-pump water heaters from DOE, ENERGY STAR and manufacturers, what the warranty tells you, and when to replace.

Continue reading →Troubleshooting

How Long Does a Water Heater Take to Heat Up?

Recovery times for gas, electric and heat-pump tanks from manufacturer spec sheets: about 1 hour for gas, 2 to 2.5 for electric, longer for heat pumps.

Continue reading →Troubleshooting

How to Drain a Water Heater With No Floor Drain

Options for draining a tank water heater when there is no floor drain nearby: a hose to a lower point, a pump, or buckets, with the safety steps first.

Continue reading →Error codes and flashing lights

How to Flush a Tankless Water Heater: What Each Brand Says

How tankless descaling works, how often Navien, Rinnai, Rheem, Noritz and Takagi say to do it, the codes that call for it, and who should do it.

Continue reading →Troubleshooting

How to Flush a Water Heater: Steps From the Manuals

How often A. O. Smith, State, Rheem and Bradford White say to drain and flush a tank water heater, the owner steps, and when to call a plumber.

Continue reading →Error codes and flashing lights

How to Reset a Tankless Water Heater by Brand

How Rinnai, Rheem, Richmond, Noritz, Navien and Takagi tankless heaters clear a code, what each manual says, and which codes a reset can't fix.

Continue reading →Troubleshooting

How to Reset a Water Heater: Gas, Electric, Tankless

What "reset" means on each type of water heater: the electric high-limit button, relighting a gas control, power-vent and tankless resets, and when not to.

Continue reading →Leaks and flooding

How to Turn Off a Water Heater in an Apartment

Stop a leaking or malfunctioning apartment water heater: shut the cold-water valve, turn off gas or power if safe, and report it to your landlord.

Continue reading →Troubleshooting

Low Water Pressure After Installing a Water Heater

Hot water pressure drops after a new water heater usually trace to a partly closed valve, debris in aerators or filters, or an undersized connector.

Continue reading →No hot water

No Hot Water After Flushing the Water Heater

Why a tank has no hot water after flushing: not completely refilled, drain valve open, pilot out, breaker off, or an element damaged by powering it empty.

Continue reading →Pilot and ignition problems

Pilot Goes Out When You Turn the Temperature Dial

Why a water heater pilot that stays lit on PILOT goes out when the knob is turned to ON or the temperature is raised, and what a technician checks.

Continue reading →Pilot and ignition problems

Pilot Light Is Lit but the Burner Won't Come On

Pilot lit but the main burner never lights? Check the knob and temperature setting first, then the thermopile, a safety limit, or the gas control.

Continue reading →Pilot and ignition problems

Pilot Won't Stay Lit After Replacing Thermocouple

If a new thermocouple didn't fix the pilot, the cause may be the wrong sensor type, its position in the flame, a weak pilot, draft, or the gas control.

Continue reading →Pilot and ignition problems

Power-Vent Water Heater Blower Not Working

Why the blower on a power-vent gas water heater won't start or runs without lighting the burner, what you can check, and why it must not be bypassed.

Continue reading →Leaks and flooding

PVC Pipe Leaking at a Water Heater: Which Pipe?

A leaking white plastic pipe at a water heater may be a condensate drain, a vent, or a relief-valve discharge line. How to tell which and how urgent it is.

Continue reading →Pilot and ignition problems

RV Water Heater Fault Light On: What It Means

A lit fault or lockout light on an RV water heater switch usually means the gas burner failed to light. What causes it and how to reset it.

Continue reading →Leaks and flooding

RV Water Heater Leaking From the Bottom

A leak at the bottom of an RV water heater tank: drain plug, anode rod, or a corroded tank. How Suburban and Atwood tanks differ and when to replace.

Continue reading →Leaks and flooding

RV Water Heater Leaking Outside the Coach

Water under the outside access door of an RV water heater: relief valve discharge, drain plug or anode, fittings, or the tank. How to find the source.

Continue reading →Pilot and ignition problems

RV Water Heater Lights Then Goes Out: Causes

An RV gas water heater that lights, then shuts off, is losing its flame signal or fuel. Causes include propane supply, wind, altitude, and the ECO.

Continue reading →No hot water

RV Water Heater Not Getting Hot Enough

Lukewarm water from an RV tank heater: bypass valves, one heat source not working, a fixed thermostat, low shore power, or small tank capacity.

Continue reading →RV water heater troubleshooting

RV Water Heater Not Working on Electric

Why an RV tank water heater heats on propane but not on 120-volt electric, what owners can check safely, and what a technician tests next.

Continue reading →Leaks and flooding

RV Water Heater Pressure Relief Valve Dripping

Why an RV water heater relief valve drips while heating, what Suburban calls normal, how to restore the air pocket, and when the valve needs replacing.

Continue reading →Gas, burning, and sulfur smells

RV Water Heater Smells Like Rotten Eggs

Rotten-egg smell from RV hot water usually comes from sulfur in the water reacting in the tank. A smell in the air may be propane. How to tell and fix it.

Continue reading →Leaks and flooding

SharkBite Water Heater Connector Leaks: Causes

Why a SharkBite push-to-connect fitting leaks at a water heater: insertion depth, pipe prep, side load, or heat, and how the joint is fixed.

Continue reading →Pilot and ignition problems

Should You Replace a Water Heater Burner Assembly?

When a gas water heater burner assembly is worth replacing, when a rusty or wet burner means the tank has failed, and what the technician checks first.

Continue reading →Troubleshooting

Should You Turn Off the Water Heater If Water Is Off?

When the water supply is shut off, whether to turn off a tank or tankless water heater, why draining is the real risk, and how to restart it safely.

Continue reading →Leaks and flooding

Smell Gas When the Water Heater Lights or Turns On?

A gas odor after lighting the pilot or each time the burner fires can mean unburned gas, delayed ignition, a leak, or exhaust spilling. How to respond.

Continue reading →No hot water

Solar Water Heater No Hot Water in the Morning

A solar water heater that is hot at night but cold by morning is losing stored heat or its backup is not running. The usual causes, by system type.

Continue reading →Leaks and flooding

T&P Valve Leaking After Testing It: What It Means

Why a water heater relief valve may keep dripping after its test lever is lifted, how long a drip is normal, and when the valve needs replacing.

Continue reading →Leaks and flooding

T&P Valve Leaking on a New Water Heater

Why the relief valve on a newly installed or newly replaced tank drips: thermal expansion, high house pressure, debris on the seat, or overheating.

Continue reading →Pilot and ignition problems

Tankless Water Heater Banging Noise

A bang from a tankless water heater can be delayed ignition, water hammer, or scale. How to tell them apart by timing, and which one means stop using it.

Continue reading →Pilot and ignition problems

Tankless Water Heater Clicking Noise

Clicking from a tankless water heater is normal at ignition, but clicking with no flame or no one using water points to a fault. How to tell which.

Continue reading →Gas, burning, and sulfur smells

Tankless Water Heater Exhaust Smells Like Gas

What to do when a tankless heater's vent smells like gas, how raw gas differs from exhaust odor, and why vent and combustion faults need a technician.

Continue reading →Tankless

Tankless Water Heater Goes Hot, Cold, Then Hot Again

Why a tankless heater swings from hot to cold mid-shower: low flow, the cold-water sandwich, recirculation, plumbing crossover, scale or gas supply.

Continue reading →Unusual noises

Tankless Water Heater Groaning Noise

A groaning tankless water heater usually points to the combustion fan, scale in the heat exchanger, a condensate drain, or a pump. How to narrow it down.

Continue reading →Leaks and flooding

Tankless Water Heater Leaking After a Freeze

A tankless water heater leaking after freezing weather may have a split heat exchanger or fitting. How to shut it down and what to expect.

Continue reading →Leaks and flooding

Tankless Water Heater Leaking From the Bottom

Water under a tankless heater can be condensate, relief-valve discharge, a filter or valve fitting, freeze damage, or the heat exchanger. How to tell.

Continue reading →Tankless

Tankless Water Heater Not Working After Rain

A tankless water heater that stops after heavy rain often has a tripped GFCI, water in the vent, or wet electronics. What to check and when to call.

Continue reading →Tankless

Tankless Water Heater Pressure Drop

Weak hot water pressure from a tankless heater? Compare hot and cold, then check the inlet filter, isolation valves, scale, and sizing in that order.

Continue reading →Leaks and flooding

Tankless Water Heater Smells Like Sulfur

Sulfur odor from a tankless water heater: in the hot water it is usually a water-supply or bacteria issue; in the air it may be a gas leak. How to tell.

Continue reading →Tankless

Tankless Water Heater Takes a Long Time to Heat Up

Waiting a long time for hot water from a tankless heater is usually pipe length, not a fault. How to time it, what is normal, and what helps.

Continue reading →Tankless

Tankless Water Heater: No Water at the Hot Taps

Hot taps dead but cold works? Check the tankless path: closed service valves, a clogged inlet filter, freezing, or scale. Navien, Rinnai, Noritz notes.

Continue reading →No hot water

Tankless: No Hot Water at the Kitchen Sink

Kitchen faucet stays cold while showers get hot from a tankless heater? Low flow, the faucet cartridge, or a crossover is usually the cause. How to check.

Continue reading →RV water heater troubleshooting

Turned On a Water Heater Without Water?

Powering an empty electric water heater usually burns out the element within moments. What to do now, and how gas, tankless and RV heaters differ.

Continue reading →Leaks and flooding

Water Coming From the Top of the Water Heater

Water on top of a tank heater usually comes from a fitting, connector, relief valve, or anode port. How to find the source and when it means replacement.

Continue reading →Leaks and flooding

Water Dripping at a Water Heater's Vent Collar

Water at a gas tank's draft hood or vent collar can be condensation, rain, a fitting above, or the tank. How to tell, and when it signals a vent problem.

Continue reading →Leaks and flooding

Water Dripping From the Water Heater Exhaust

Why water drips from a gas water heater's vent: condensate, rain, a blocked condensate drain, or a leak inside the heater, and which need service.

Continue reading →Leaks and flooding

Water Dripping Inside the Water Heater

Water inside a tank heater may be flue condensation, a fitting leak running down, or a failed tank. How to tell them apart and what to do.

Continue reading →Leaks and flooding

Water Dripping on a Gas Water Heater Burner

Water near a gas burner may be condensation, tracked water, or a tank leak. Keep wet equipment off and have the source and combustion safety assessed.

Continue reading →Leaks and flooding

Water Dripping on the Water Heater Pilot Light

Water landing on a gas water heater's pilot can be condensation, a leak running down from above, or a failing tank. How to find the source safely.

Continue reading →Leaks and flooding

Water Heater Alarm Going Off: What Is Beeping?

Find what is beeping: a tankless controller, heat-pump water heater, leak sensor, or a nearby smoke or CO alarm, and what each alarm needs.

Continue reading →Troubleshooting

Water Heater and Furnace Both Not Working

When the water heater and furnace stop together, look at what they share: gas or propane supply, the vent, or power. What to check and when to leave.

Continue reading →Troubleshooting

Water Heater Anode Rod: What It Does and When to Check It

What a water heater anode rod does, magnesium vs aluminum vs powered, how often manufacturers say to inspect it, signs it's used up, and who replaces it.

Continue reading →Error codes and flashing lights

Water Heater Beeping After a Power Outage

Why a hybrid, tankless, or power-vent water heater beeps when power comes back, how to restart it safely, and when the outage may have damaged the control.

Continue reading →No hot water

Water Heater Beeping and No Hot Water

A heater that beeps and stops heating has locked out. Read the code, learn what each heater type is protecting against, and know when to call.

Continue reading →Error codes and flashing lights

Water Heater Blinking Blue Light: What It Means

A blinking blue light on a gas water heater is usually the gas control's status LED. When it is normal, and why the code chart depends on the control.

Continue reading →Error codes and flashing lights

Water Heater Blinking Red Light: Read the Fault

What a blinking red light means on gas, electric, heat-pump, and tankless water heaters, how to count it, and when one reset is reasonable.

Continue reading →Gas, burning, and sulfur smells

Water Heater Burning Smell: Causes and What to Do

What a burning, hot-plastic, or electrical smell from a water heater means, which smells are a brief new-heater burn-off, and when to shut it off.

Continue reading →Leaks and flooding

Water Heater Burst: What to Do Right Now

First steps when a water heater bursts or floods: stop the water, shut off power or gas safely, protect the house, and what happens next.

Continue reading →Pilot and ignition problems

Water Heater Buzzing Noise: Find the Source

Where a buzz or hum from a water heater usually comes from (elements, gas valve, fan, heat pump, or the breaker) and which buzzing sounds need attention.

Continue reading →Gas

Water Heater Chamber Sensor Failure

What a flammable-vapor or combustion-chamber sensor fault means on a gas water heater, common causes, safe checks, and why it must not be bypassed.

Continue reading →Leaks and flooding

Water Heater Check Valve Leaking or Failing

How to tell whether a check valve near your water heater is leaking from its body or letting water flow backward, and what each problem means for repair.

Continue reading →Troubleshooting

Water Heater Clunking Sound: Causes by Timing

A clunk near the water heater is usually water hammer, a slamming check valve, or a recirculation pump. How the timing of the sound points to the cause.

Continue reading →No hot water

Water Heater Cold Water Inlet Leaking

Water at the cold inlet can be the shutoff valve stem, a connector, the inlet nipple, or a sweating cold pipe. How to tell, and which are simple repairs.

Continue reading →Leaks and flooding

Water Heater Connector Leaking: Repair or Replace

Why flexible water heater connectors and their fittings leak, how to confirm the connector is the source, and what a proper replacement looks like.

Continue reading →Gas, burning, and sulfur smells

Water Heater Control Box Leaking Gas: What to Do

A gas smell at a water heater's gas control is an emergency. What to do right away, what not to touch, and what the gas technician checks afterwards.

Continue reading →No hot water

Water Heater Dip Tube Failure: Signs and Fix

A broken dip tube sends cold water to the top of the tank, so hot water turns lukewarm quickly. Signs to look for, how it is confirmed, and repair options.

Continue reading →Unusual noises

Water Heater Exhaust Blower Noise: Causes

What squealing, grinding, rattling, or gurgling from a power-vent water heater's exhaust blower means, which sounds are normal, and when to stop using it.

Continue reading →Troubleshooting

Water Heater Fan Keeps Running: Normal or a Fault?

Which water heaters run a fan for long periods by design, which should go quiet after heating, and the signs a fan that won't stop needs service.

Continue reading →Pilot and ignition problems

Water Heater Flame Too High or Yellow: What It Means

How to tell a normal gas water heater burner from one that is overfiring, starved of air, or rolling out, and which signs mean shut it off now.

Continue reading →Leaks and flooding

Water Heater Hissing Noise, Including After a Shower

A hiss may be sediment, a fitting, the relief valve or, rarely, a gas leak. Where it comes from, and why it often starts after a shower, tells you which.

Continue reading →Leaks and flooding

Water Heater Leaking After a Power Outage

Why water can appear at a heater once power returns: relief-valve discharge, a condensate pump that stopped, or freeze damage, and how to find which.

Continue reading →Leaks and flooding

Water Heater Leaking From a Plastic Plug on Top

What the plastic caps and fittings on top of a tank water heater are, why they can leak, and how to tell a fitting leak from a failing tank.

Continue reading →Leaks and flooding

Water Heater Leaking From an Outside Pipe

Water on a pipe attached to the outside of a water heater: how to tell a connector, relief valve, drain line, or condensate leak from a failing tank.

Continue reading →Leaks and flooding

Water Heater Leaks When the Washing Machine Runs

If water appears only during laundry, the cause is often a pressure spike at the relief valve, a connector that leaks under flow, or the washer itself.

Continue reading →Pilot and ignition problems

Water Heater Made a Loud Bang: What to Do

A loud bang as a gas water heater lights is often delayed ignition. How to tell it from sediment popping or water hammer, and why to stop using it.

Continue reading →Unusual noises

Water Heater Making a Gurgling Noise: Causes

Gurgling from a water heater usually comes from air after draining, sediment, a relief valve releasing water, or a condensate line. How to tell which.

Continue reading →Pilot and ignition problems

Water Heater Piezo Igniter Won't Spark: Causes

Why the push-button igniter on a standing-pilot gas water heater may not click or spark, and what to do when it sparks but the pilot won't light.

Continue reading →Pilot and ignition problems

Water Heater Pilot Goes Out in Cold Weather

Why a gas water heater pilot that is fine all summer goes out on cold or windy days: downdrafts, closed-up houses, propane pressure, and condensation.

Continue reading →Leaks and flooding

Water Heater Plastic Drain Valve Dripping

A drip from the plastic drain valve at the bottom of a tank is usually the valve, not the tank. How to confirm it and what the replacement involves.

Continue reading →Leaks and flooding

Water Heater Problems in a Crawl Space

What to do about a leaking, cold, or poorly venting water heater in a crawl space, how to judge whether it is safe to go under, and when to replace it.

Continue reading →Troubleshooting

Water Heater Relief Valve Not Working: Warning Signs

Signs a water heater's temperature and pressure relief valve may not protect the tank: seized lever, blocked discharge, or overheating with no relief.

Continue reading →Troubleshooting

Water Heater Relief Valve Stuck Open: What to Do

What to do when a relief valve keeps pouring water: shut off heat and water in the right order, why it happens, and why it must never be capped.

Continue reading →Troubleshooting

Water Heater Shuts Off After a Few Minutes: Causes

A heater that runs a few minutes then shuts off is usually tripping a safety or losing flow. What the timing means on gas, electric, and tankless units.

Continue reading →Pilot and ignition problems

Water Heater Smells Like a Dead Animal?

A rotten or dead-animal smell near a water heater can be gas, sulfur in the hot water, or an actual animal in the vent or burner area. How to tell.

Continue reading →Gas, burning, and sulfur smells

Water Heater Smells Like Gas: What to Do Right Now

A gas smell near a water heater is an emergency. What to do first, how to tell gas from sulfur water or new-heater odor, and propane cautions.

Continue reading →Unusual noises

Water Heater Sounds Like Rocks Inside

Rumbling, popping or rattling like rocks in a tank heater is usually sediment on the bottom. When flushing helps and when the noise means a failing tank.

Continue reading →Leaks and flooding

Water Heater Sounds Like Running Water

If a water heater sounds like water running with every tap closed, water is moving: a relief valve, a leak, a recirculation pump or a dripping fixture.

Continue reading →Error codes and flashing lights

Water Heater Status Light Blinking 3 Times

Three status-light flashes mean different faults on different gas controls. Documented meanings for Bradford White ICON and Rheem PowerVent heaters.

Continue reading →Leaks and flooding

Water Heater Status Light Blinking 6 Times

Six flashes can be a leak alarm on Bradford White ICON tanks or a two-part ignition or vent code on power-vent models. How to read the pattern.

Continue reading →Troubleshooting

Water Heater Suddenly Too Hot

Water that suddenly comes out scalding can mean a stuck thermostat, a failed gas control, or a mixing valve that stopped working. What to do first.

Continue reading →RV water heater troubleshooting

Water Heater Switch Not Working

When a water heater switch does nothing, the cause is usually a tripped breaker, a disconnect or fused pullout, or on an RV a 12- or 120-volt supply fault.

Continue reading →Troubleshooting

Water Heater Temperature Control Not Working

Turning the dial and seeing no change? It may be a mixing valve, a tripped high-limit, a failed thermostat or gas control, or the wrong expectations.

Continue reading →Troubleshooting

Water Heater Thermal Fuse: What It Means

A thermal fuse is a one-time overheat safety. Which water heaters use one, how it differs from a resettable switch, and why it must never be bypassed.

Continue reading →Pilot and ignition problems

Water Heater Thermocouple Problems

How a water heater thermocouple fails, how to tell it from a gas valve or thermopile problem, and which heaters don't use a thermocouple at all.

Continue reading →Leaks and flooding

Water Heater Ticking Like a Clock

A steady ticking near a water heater is usually pipes expanding, heat-trap fittings, or a check valve. When ticking is harmless and when it's a leak.

Continue reading →Leaks and flooding

Water Heater Vent Pipe Leaking Water

Water dripping from a water heater vent pipe can be condensation, rain, or a vent fault that also lets exhaust escape. How to tell and what to do.

Continue reading →Troubleshooting

Water Heater Won't Stop Draining

If a water heater keeps running water out of the drain or relief valve, close the cold inlet, shut off the energy, and identify which valve is open.

Continue reading →Leaks and flooding

Water in the Pan Under a New Water Heater

Water in the pan under a newly installed heater is usually condensation, relief valve discharge, or a loose fitting or drain valve. How to tell which.

Continue reading →Leaks and flooding

Water Leaking From the Bottom of the Tank

A puddle under a tank water heater can come from a drain valve, relief discharge, a fitting, condensation, or the tank. How to tell and what it means.

Continue reading →Leaks and flooding

Water on a Water Heater's Gas Control Valve

Water on the gas control usually runs down from a fitting above or comes from the tank itself. How to trace it and when a wet control means replacement.

Continue reading →Troubleshooting

Water Won't Drain From the Water Heater

A water heater that won't drain usually has a sediment-clogged drain valve or no air getting into the tank. Common causes and when to call a plumber.

Continue reading →Pilot and ignition problems

When Does a Water Heater Pilot Assembly Need Replacing?

What a water heater pilot assembly includes, which failures it fixes, which it doesn't, and why technicians often replace the whole kit on FVIR heaters.

Continue reading →Gas, burning, and sulfur smells

White Smoke Coming From a Water Heater

White vapor from a water heater is often steam, but it can also be spilling exhaust or overheating wiring. How to tell them apart and what to do.

Continue reading →Leaks and flooding

Why Does My Water Heater Overflow Keep Discharging?

A relief valve that keeps discharging usually means high water pressure, thermal expansion, overheating, or a worn valve. What to check and never cap it.

Continue reading →Gas, burning, and sulfur smells

Why Does My Water Heater Smell Fishy?

A fishy smell in the air near a water heater can mean overheating wiring; a fishy smell in the water is usually water quality. How to tell which.

Continue reading →Pilot and ignition problems

Why Does My Water Heater Turn Off by Itself?

A water heater that shuts off on its own has usually tripped a safety: a high-limit, flame sensor, vent switch, or breaker. How to tell which one.

Continue reading →Leaks and flooding

Why Is My Tankless Water Heater Draining So Much?

Water from a tankless heater is usually condensate, relief-valve discharge, freeze-protection drainage, or a leak. How to tell which and what's normal.

Continue reading →Pilot and ignition problems

Why Won't My Gas Water Heater Pilot Stay Lit?

Why a standing pilot goes out on a gas tank, how the control type changes the cause, what owners can safely check, and what a technician tests.

Continue reading →A. O. Smith

A. O. Smith Blinking Green Light: Normal or a Fault?

How to tell a normal A. O. Smith gas status light from a fault code, with A. O. Smith's own flash-code meanings for its standing-pilot FVIR models.

Continue reading →A. O. Smith

A. O. Smith Blinking White Light: Reading the Pattern

What a steady, slow, fast or missing status light means on A. O. Smith gas water heaters, including Ultra Low NOx models with a separate LDO module.

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A. O. Smith Gas Control Valve: Is It Really Bad?

How to tell whether an A. O. Smith gas control valve has failed or another part is the cause, using A. O. Smith's own status codes and service checks.

Continue reading →A. O. Smith

A. O. Smith Gas Water Heater Reset Keeps Tripping

Why the reset on an A. O. Smith gas water heater keeps tripping: what the button protects, what the timing tells you, and when the heater must stay off.

Continue reading →A. O. Smith

A. O. Smith or State Water Heater Igniter Not Working

Which igniter your A. O. Smith or State gas heater uses, what a missing spark or glow means, what you can safely check, and what a technician tests.

Continue reading →A. O. Smith

A. O. Smith Tankless No Hot Water: Checks and Codes

Why an A. O. Smith gas tankless gives no hot water: power, flow, gas, filter and freezing checks, plus verified codes for the 240, 340 and 540 models.

Continue reading →A. O. Smith

A. O. Smith Tankless Reset: Where It Is and When to Use It

A. O. Smith gas tankless heaters have no red reset button; a lockout clears by cycling power. Which codes a reset can clear and which need service.

Continue reading →A. O. Smith

A. O. Smith Water Heater Blinks 3 Times: What It Means

Three flashes on an A. O. Smith gas water heater points to an air or damper fault on the models that use it. How to confirm your model and what to do.

Continue reading →A. O. Smith

A. O. Smith Water Heater Humming Noise

Why an A. O. Smith water heater hums or buzzes: which sounds are normal on electric, gas, power-vent and hybrid models, and which need a technician.

Continue reading →A. O. Smith

A. O. Smith Water Heater Troubleshooting Guide

Troubleshoot an A. O. Smith water heater by type: gas, electric, hybrid heat pump or tankless. What to check first and what the lights and codes mean.

Continue reading →AERCO

AERCO Water Heater Troubleshooting

How AERCO Innovation and SmartPlate water heaters fail, what building staff can check, and what an AERCO-trained technician will look at.

Continue reading →Alde

Alde RV Heater Problems: No Heat, Faults and Glycol

Alde Compact 3020 RV problems: no heat or hot water, panel fault messages, low battery, air in the glycol, a dripping safety valve and frost damage.

Continue reading →Whirlpool

American and Whirlpool Water Heater Troubleshooting

American Water Heaters, an A. O. Smith company, also built Whirlpool-brand tanks for Lowe's. How to sort a cold, flashing or leaking unit.

Continue reading →Apollo

Apollo Water Heater Troubleshooting

Apollo on a water heater or air handler can mean different products. How to identify yours and narrow down no heat, lukewarm water or a cold air handler.

Continue reading →Aquah

Aquah Tankless Water Heater Troubleshooting

Why an Aquah portable propane or electric tankless heater won't heat: flow, batteries, propane supply, power, and why portable units are outdoor-only.

Continue reading →Atwood / Dometic

Atwood RV Water Heater Clicking But Not Lighting

An Atwood RV water heater that clicks but won't light is sparking without flame. Causes include propane supply, the igniter, nests and the gas valve.

Continue reading →Atwood / Dometic

Atwood RV Water Heater Element: When to Replace It

How to tell whether an Atwood or Dometic RV water heater's electric element has failed, what else stops electric heating, and what the repair involves.

Continue reading →Atwood / Dometic

Atwood RV Water Heater Troubleshooting

Troubleshoot an Atwood (Dometic) RV water heater by splitting gas from electric, then checking water, bypass valves, propane, 12-volt and shore power.

Continue reading →Atwood / Dometic

Atwood Water Heater Not Working on Electric

Why an Atwood (Dometic) RV water heater heats on propane but not on 120-volt electric, what you can check, and what an RV technician tests.

Continue reading →Atwood / Dometic

Atwood Water Heater Reset Button: Which Reset Applies

Atwood (Dometic) RV heaters have a manual-reset electric limit, a switch-cycle gas lockout reset, and fuses that aren't resets. Which applies when.

Continue reading →Atwood / Dometic

Atwood Water Heater Won't Stay Lit on Propane

An Atwood (Dometic) RV heater that lights and goes out is usually losing propane, flame contact or 12-volt power. What you can check and what a tech tests.

Continue reading →Baxi

Baxi Combi No Hot Water: Codes and Common Causes

Why a Baxi combi boiler stops making hot water: low system pressure, ignition lockout, circulation and sensor faults. Verified Baxi codes and owner checks.

Continue reading →AquaStar

Bosch AquaStar Tankless Troubleshooting

Why a Bosch AquaStar gas tankless heater runs cold: flow, the inlet screen, pilot or ignition type, venting, and what a display code means on newer models.

Continue reading →Bosch

Bosch Water Heater Troubleshooting by Model Type

Bosch makes gas tankless, electric tankless and mini-tank heaters. How to tell yours apart and what Bosch says to check when there's no hot water.

Continue reading →Bradford White

Bradford White Defender Pilot Won't Stay Lit

Why a Bradford White Defender pilot goes out when you release the knob or a few hours later, which gas control you have, and what a technician checks.

Continue reading →Bradford White

Bradford White Hydrojet Leaking at the Cold Inlet

Water at a Bradford White cold inlet is usually a nipple, union or connector, not the Hydrojet dip tube. How to find it and what's repairable.

Continue reading →Bradford White

Bradford White Igniter Not Working: Spark or Glow?

A Bradford White igniter that won't spark or glow: piezo igniters on atmospheric tanks versus electronic ignition on power-vent models, and what to check.

Continue reading →Bradford White

Bradford White Pilot Won't Light at All

When a Bradford White pilot never appears: no gas at the pilot, no spark, a blocked pilot tube, or a missed lighting step. Owner and technician checks.

Continue reading →Bradford White

Bradford White Status Light Not On: What It Means

A dark status light on a Bradford White gas control usually means no pilot and no thermopile power. When that's normal, when it isn't, and what to check.

Continue reading →Bradford White

Bradford White Water Heater Beeping: Find the Source

Standard Bradford White gas tanks flash an LED; they don't beep. Which Bradford White models have audible alerts, and what else nearby might be beeping.

Continue reading →Bradford White

Bradford White Water Heater Leaking From the Top

Water on top of a Bradford White tank usually comes from a pipe connection, the relief valve or the anode fitting. Find which, and when it's the tank.

Continue reading →Bradford White

Bradford White Water Heater Troubleshooting Guide

Troubleshoot a Bradford White by type: gas status-light codes, electric no-heat, leaks and display models. Verified LED meanings and owner checks.

Continue reading →Bradford White

Bradford White Water Not Hot Enough: Common Causes

Lukewarm water from a Bradford White tank: setting, mixing valves, demand, cold inlet water, a failed element or dip tube, or a gas control problem.

Continue reading →Bradford White

Bradford White Weak Pilot Signal: 2 Flashes

Two flashes and a pause on a Bradford White gas control means low thermopile voltage. What causes it, what you can check, and the usual repair.

Continue reading →Camplux

Camplux Water Heater Not Lighting, Lukewarm or Shutting Off

Camplux propane heater won't light, runs lukewarm or shuts off: batteries, flow, propane, wind and settings. Portables without a vent are outdoor-only.

Continue reading →Atwood / Dometic

Dometic (Atwood) Water Heater Thermal Fuse Blown

The thermal cutoff on Atwood/Dometic RV heaters is a one-time fuse that opens when burner heat escapes. Why it blows and why it's never bypassed.

Continue reading →Envirotemp

Envirotemp Water Heater Troubleshooting

Envirotemp heaters are ordinary gas or electric tanks. Learn to tell which you have and which checks are safe when it is cold or leaking.

Continue reading →Excel

Excel Tankless Water Heater Troubleshooting

Small Excel propane tankless heaters: why they pass cold water, what the ODS does, and why unvented units belong outdoors only.

Continue reading →Fogatti

Fogatti Tankless Water Heater Troubleshooting

A Fogatti tankless that will not heat: identify RV, indoor, or outdoor model, check propane, power, and flow, and what an E1 ignition code suggests.

Continue reading →Furrion

Furrion Tankless Water Heater E1 Code

Furrion's E1 code points to an ignition-stage flame problem, usually short propane supply. What to check, how to reset once, and when to call for service.

Continue reading →Furrion

Furrion Tankless Water Heater Troubleshooting

Furrion RV tankless not heating? The E0 to E7 codes, plus the winterize, flow, 12-volt, and propane problems that cause most no-heat calls.

Continue reading →GE / GeoSpring

GE Water Heater Pilot Light Won't Light

A GE gas water heater pilot that never lights: gas supply, igniter, a blocked pilot, or a control that isn't in the pilot position. What you can check.

Continue reading →Girard

Girard Tankless Water Heater Reset: How It Works

The Girard GSWH-2 has no tank-style reset button. How the manual says to clear a lockout, and which codes should not be reset.

Continue reading →Girard

Girard Tankless Water Heater Troubleshooting

Girard GSWH-2 RV tankless codes E0 to E9, En and Fd explained from the owner's manual, plus flow, propane, and 12-volt checks.

Continue reading →Honeywell / Resideo

Honeywell Water Heater Control: Thermocouple or Not?

Before replacing a thermocouple on a Honeywell (Resideo) water heater gas control, confirm which flame sensor the valve uses and what else stops a pilot.

Continue reading →Honeywell / Resideo

Honeywell Water Heater Igniter Not Sparking

No spark at the pilot on a water heater with a Honeywell gas control: how to check the igniter safely, what the status light says, and who repairs it.

Continue reading →Bradford White

How to Relight a Bradford White Pilot Light

Relighting a Bradford White gas water heater pilot: the shutdown wait on LED controls, what normal light patterns look like, and what to do if it fails.

Continue reading →Honeywell / Resideo

How to Reset a Honeywell Water Heater Gas Control

Honeywell/Resideo water heater gas controls reset by turning off, waiting, and relighting. What the status light means and when not to reset.

Continue reading →Navien

How to Reset a Navien Tankless Water Heater

Which button resets each Navien model (NPE-2, older NPE, NPN, NHW, NCB combi), why not to unplug it, and when a reset won't clear the code.

Continue reading →Suburban

How to Reset a Suburban RV Water Heater

Suburban RV water heaters have two resets: the DSI lockout restart and the ECO high-limit. What the manual says for each, and when not to reset.

Continue reading →Takagi

How to Reset a Takagi Tankless Water Heater

Most Takagi lockouts clear by turning power off and on after you fix the cause. Which codes to record first, and when a reset isn't enough.

Continue reading →HTP / Phoenix

HTP Water Heater Troubleshooting: Phoenix and SuperStor

Identify your HTP, then troubleshoot it: Phoenix condensing tank lockouts and leaks, SuperStor indirect tanks that stay cold, and tankless units.

Continue reading →Kenmore

Kenmore Water Heater Troubleshooting

Kenmore tank water heaters were built for Sears by other manufacturers. How to find yours, then check the common gas, electric and leak problems.

Continue reading →Marey

Marey Gas Tankless Water Heater Not Igniting

Why a Marey gas tankless won't light: batteries, water flow and pressure, gas supply, and venting. What GA16ETL codes mean, per Marey's manuals.

Continue reading →Navien

Navien Condensate Drain Leaking: Causes and Fixes

Water from a Navien condensate line is normal while it fires. Puddles mean a blocked, kinked, frozen or poorly sloped drain or a failed pump. How to tell.

Continue reading →Navien

Navien Constantly Running: Recirculation or a Leak?

A Navien that seems to run nonstop is usually recirculation doing its job. If the burner fires with no tap open and recirculation off, look for a leak.

Continue reading →Navien

Navien E003: Ignition Failure Explained

Navien lists E003 as ignition failure. What usually causes it, the one check Navien gives owners, how to reset once, and what a technician tests.

Continue reading →Navien

Navien E773: Wrong Gas Type Detected

Navien's NPE-2 manual lists E773 as using the wrong gas. What that means, why it appears after installs, moves or conversions, and who corrects it.

Continue reading →Navien

Navien Error 598-00: What Is Known and What to Do

Navien 598-00 is widely reported as a clock (RTC) fault, but it isn't in the NPE-2 owner's error table. What that means and how to get it confirmed.

Continue reading →Navien

Navien Exhaust or Air Intake Blocked (E110, E030)

How Navien reports a blocked vent or air intake, what the manual tells owners to check for E110 and E030, and when a venting problem needs a technician.

Continue reading →Navien

Navien Goes Cold After a Few Minutes

When a Navien heats, then turns cold and stays cold: low flow, a clogged inlet filter, recirculation check valves, or codes E012, E016 and E030.

Continue reading →Navien

Navien Hot Water Takes Too Long to Arrive

Why you wait for hot water from a Navien, how to time it, and how recirculation on A2 models, demand controls and plumbing changes shorten the wait.

Continue reading →Navien

Navien Knocking, Banging or Vibrating: What Causes It

A Navien that knocks, bangs, buzzes or vibrates: water hammer, scale, recirculation pump or check valves, the fan, mounting, or delayed ignition.

Continue reading →Navien

Navien Low Hot Water Pressure: Find the Restriction

Strong cold water but weak hot water from a Navien usually means a clogged inlet filter, part-closed valves, scale, or the heater limiting flow.

Continue reading →Navien

Navien Tankless During and After a Power Outage

Why a Navien gives no hot water without power, how freeze protection depends on electricity, and what to check when it won't restart afterward.

Continue reading →Navien

Navien Tankless Error Codes: Owner's List

Every error code in Navien's NPE-2 and NPN owner manuals, what each means, the owner check Navien lists, and which codes need technical support.

Continue reading →Navien

Navien Water Heater Not Getting Hot Enough

When a Navien runs but water stays lukewarm: the setting, a mixing valve or plumbing crossover, temperature rise and sizing, scale, filters or gas supply.

Continue reading →Navien

Navien Water Heater Won't Turn On

A Navien with a blank display or no response when hot water runs: power supply, the front-panel Power button, flow below 0.5 GPM, filters or valves.

Continue reading →Noritz

Noritz Code 11: Ignition Error

Noritz lists code 11 as an ignition error. Noritz's owner checks, the reset sequence, when 11 is expected after draining, and what a technician tests.

Continue reading →Noritz

Noritz Code 12: Flame Loss

Noritz code 12 means the burner lit and then lost its flame. Common causes include gas supply under load, venting, and the flame rod. What you can check.

Continue reading →Noritz

Noritz Code 29: Condensate Drain Blocked

Noritz lists code 29 as a clogged condensate trap or drain pipe. What to check for blockage or freezing, and when the installer needs to clear it.

Continue reading →Noritz

Noritz Tankless Not Hot Enough: Lukewarm Water

Why a Noritz delivers lukewarm water: the temperature setting, flow beyond capacity, a clogged filter, scale, or a plumbing crossover. Noritz's guidance.

Continue reading →Noritz

Noritz Tankless Not Working: Dead Remote or No Response

When a Noritz shows nothing or ignores an open hot tap: power, the remote, flow and the inlet filter, reversed plumbing on new installs, and freezing.

Continue reading →Noritz

Noritz Tankless Running but No Hot Water

Water flows but stays cold from a Noritz tankless: gas supply, valves, the inlet filter, the power button, or a flashing error code. Noritz's checks first.

Continue reading →Polaris

Polaris Water Heater Problems and Lockouts

Common problems with American Water Heaters Polaris condensing gas tanks: condensate drain blockages, ignition and blower lockouts, scale, and leaks.

Continue reading →Quietside

QuietSide Tankless and Combi Heater Problems

Why a QuietSide QVM combi or tankless unit stops making hot water: power, gas supply, venting, a clogged strainer, or a diverter valve, plus repair odds.

Continue reading →Reliance

Reliance 6-Year Water Heater Troubleshooting

Troubleshoot a Reliance 6-year gas or electric water heater: how to read the model number, then sort no heat, status light codes, and leaks.

Continue reading →Reliance

Reliance Gas Water Heater Status Light Not Blinking

On a Reliance gas water heater, a status light that is off usually means the pilot is out or the thermopile isn't making enough power. What to check.

Continue reading →Reliance

Reliance Gas Water Heater Won't Light

Why a Reliance gas water heater won't light: gas supply, the lighting sequence, igniter spark, a clogged air intake, or a status-light lockout.

Continue reading →Rheem

Rheem Code 11: Tankless and Power-Vent Meanings

Rheem code 11 on a tankless means the burner didn't light; on a power-vent tank it is an ignition lockout. What each manual says and how to reset.

Continue reading →Rheem

Rheem Failed Ignition Lockout: Soft vs Hard Lockout

What a failed-ignition lockout means on a Rheem power-vent or condensing gas water heater, how soft and hard lockouts clear, and what causes them.

Continue reading →Rheem

Rheem Gas Control or Valve Failure: Signs and Codes

How a failed Rheem gas control shows up on atmospheric and power-vent models, what else causes the same symptoms, and when a new control is the fix.

Continue reading →Rheem

Rheem Gas Water Heater Won't Light: What to Check

A Rheem gas water heater that won't light: tell a standing pilot from electronic ignition, owner checks for gas and lockouts, and what a technician tests.

Continue reading →Rheem

Rheem Plastic Drain Valve Leaking

How to tell whether a drip at a Rheem water heater's plastic drain valve is the valve or the tank, what you can do now, and what a plumber will replace.

Continue reading →Rheem

Rheem Power Vent: Pressure Switch Failed Open

On a Rheem power-vent water heater, three flashes mean the pressure or blower thermal switch failed open. Common causes, owner checks, and repairs.

Continue reading →Rheem

Rheem Red Light Flashing 9 Times: Chamber Sensor

Nine red flashes on a Rheem atmospheric gas water heater means a chamber sensor fault. Why it trips, what you can check, and what the technician does.

Continue reading →Rheem

Rheem Tankless Error Code 12: Flame Loss

What Rheem's manual says about tankless code 12 (and IKONIC A012): interrupted gas, low propane, and flame loss. What to check and when to call.

Continue reading →Rheem

Rheem Tankless Leaking Inside the Cabinet

Water inside or under a Rheem tankless may come from a fitting, the inlet filter, the relief valve, condensate, or the heat exchanger. How to tell.

Continue reading →Rheem

Rheem Tankless Water Heater Troubleshooting

Why a Rheem gas tankless isn't heating: no power, too little flow, a clogged inlet filter, or an error code. What Rheem's manual says about each.

Continue reading →Rheem

Rheem Thermopile Voltage Low: 2 Red Flashes

On a Rheem atmospheric gas water heater, two red flashes mean low thermopile voltage with the pilot still lit. What causes it and what to do next.

Continue reading →Rheem

Rheem Water Heater Has No Status Light

Why the status light on a Rheem gas water heater is off or solid, how that differs on power-vent and electric models, and what to check before calling.

Continue reading →Rheem

Rheem Water Heater Light Flashing 7 Times

Seven flashes on a Rheem gas water heater means a gas control failure on atmospheric models and a flammable vapor lockout on power-vent models.

Continue reading →Rheem

Rheem Water Heater Pilot Light Won't Stay Lit

Why a Rheem gas water heater pilot goes out, what the status light tells you, and which causes you can rule out before calling a technician.

Continue reading →Richmond

Richmond Tankless Error Codes: 11, 12, 29 and More

What Richmond Essential Plus and Encore tankless codes mean, including 11, 12, 29, 1L, 88 and A0 codes, and the reset sequence Richmond gives.

Continue reading →Richmond

Richmond Water Heater Blinking Light Codes

What a Richmond gas water heater's status light means: blue and red blink counts on atmospheric models and flash codes on power-vent models.

Continue reading →Richmond

Richmond Water Heater Gas Valve Problems

How to tell whether a Richmond gas water heater's problem is the gas control valve or a part around it, what you can check, and when a valve is replaced.

Continue reading →Richmond

Richmond Water Heater Temperature Settings

What the HOT, A, B and C marks mean on a Richmond gas control, how electric and tankless models are set, and why 120°F is the starting point.

Continue reading →Rinnai

Rinnai Beeping With Code 17: Venturi Blockage

On Rinnai SENSEI tankless heaters, code 17 means venturi blockage. What Rinnai says to check first, what you can do, and why the venturi is a pro job.

Continue reading →Rinnai

Rinnai Code 10: Air Supply or Exhaust Blockage

What Rinnai tankless code 10 means, the outside checks you can make (vent caps, condensate line, air filter), and what a technician inspects next.

Continue reading →Rinnai

Rinnai Code 11: No Ignition on a Rinnai Tankless

Rinnai code 11 means no ignition. The owner checks Rinnai lists, which steps need a licensed professional, and why it often follows a new install.

Continue reading →Rinnai

Rinnai Code 14: Thermal Fuse or Overheat

Rinnai code 14 means the heat exchanger overheated and a safety opened. Common causes (scale, airflow, recirculation) and why repeats need service.

Continue reading →Rinnai

Rinnai Code 25: Condensate Drain or Pump Fault

Rinnai code 25 means condensate is backing up: a full float switch, a failed condensate pump, or a clogged or frozen drain line. What to check.

Continue reading →Rinnai

Rinnai Control Panel Not Working: What to Check

A blank or unresponsive Rinnai controller usually means lost power, a controller turned off, a Priority setting, or a cable fault. Checks and next steps.

Continue reading →Rinnai

Rinnai Dripping at the Exhaust After Shutoff

Water at a Rinnai vent after the burner stops is often vent condensate or rain, but it can signal a blocked drain or a leaking heat exchanger. How to tell.

Continue reading →Rinnai

Rinnai Error Code 12: Flame Failure

Rinnai code 12 means the burner lit and then lost its flame. Owner checks for gas supply and propane, cold-weather causes, and what a technician tests.

Continue reading →Rinnai

Rinnai Goes Cold After a Few Minutes: Why

A Rinnai that runs hot then turns cold mid-shower is usually near its minimum flow, losing flame (code 12), or overheating. How to tell which.

Continue reading →Rinnai

Rinnai In Use Light Not On: No Call for Heat

If the Rinnai In Use indicator stays off when you open a hot tap, the heater is not detecting flow. Check power, On/Off, flow rate, and the inlet filter.

Continue reading →Rinnai

Rinnai Not Working After a Power Outage

Why a Rinnai tankless may not heat after a power outage: tripped GFCI, controller left off, code 03 after bath fill, a lockout, or freeze damage.

Continue reading →Rinnai

Rinnai Pressure Relief Valve Leaking: Causes

Why the pressure relief valve on a Rinnai tankless drips or discharges: high supply pressure, thermal expansion, overheating, or a worn valve.

Continue reading →Rinnai

Rinnai R53 Tankless Problems and Fixes

Common Rinnai R53 problems: codes 10, 11, 12, 14 and 16, scale, low flow, and capacity limits. What owners can check and when to repair or replace.

Continue reading →Rinnai

Rinnai Takes Too Long for Hot Water: Why

Why hot water takes a long time to arrive from a Rinnai tankless: pipe length, low fixture flow, and missing recirculation. How to shorten the wait.

Continue reading →Rinnai

Rinnai Tankless Constantly Running: Causes

Why a Rinnai tankless seems to run nonstop: recirculation pumps, freeze protection, fan post-purge, hidden hot-water flow, or a sensor fault.

Continue reading →Rinnai

Rinnai Tankless Humming Noise: Normal or Not?

Which Rinnai tankless hums are normal (combustion fan, recirculation pump) and which deserve service (grinding fan, buzzing with a code, gas smell).

Continue reading →Rinnai

Rinnai Tankless Low Hot Water Pressure: Causes

Weak hot-water flow from a Rinnai tankless usually traces to the inlet filter, service valves, scale, house pressure, or the heater limiting flow.

Continue reading →Rinnai

Rinnai Tankless No Hot Water: Where to Start

A Rinnai tankless with no hot water at any tap: use the display and In Use light to tell a power, flow, or ignition problem apart, then what to check.

Continue reading →Rinnai

Rinnai Tankless Not Getting Hot Enough

Why a Rinnai tankless delivers lukewarm water: demand beyond its capacity, scale, gas supply, mixing valves, or recirculation. How to narrow it down.

Continue reading →Rinnai

Rinnai Tankless Water Heater Frozen: What to Do

What to do when a Rinnai tankless freezes: Rinnai's shutdown and thaw steps, how to check for leaks, and how its freeze protection works.

Continue reading →Ruud

Ruud and Richmond Water Heater Troubleshooting

Ruud and Richmond are Rheem brands. How to sort a cold, flashing or leaking Ruud or Richmond tank by fuel, status light and leak location.

Continue reading →State

State Select Gas Water Heater Troubleshooting

A State Select gas water heater with no heat usually has a pilot, thermocouple, or blocked air-intake problem. What the manual covers and what a pro does.

Continue reading →State

State Select Water Heater No Hot Water

No hot water from a State Select? Electric and gas models fail differently. Sort the symptom, do the safe checks, and know what a technician will test.

Continue reading →Suburban

Suburban RV Heater Not Working on Gas

Suburban RV water heater works on electric but not propane? Check LP supply, 12-volt power, and the lockout light, then let an RV tech handle ignition.

Continue reading →Suburban

Suburban RV Water Heater Leaking

Water around a Suburban RV water heater usually comes from the anode plug, relief valve, fittings, or bypass valves. How to find it and when to replace.

Continue reading →Suburban

Suburban SW6DE and SW10DE Troubleshooting

Suburban SW6DE or SW10DE not lighting, not heating on electric, leaking or noisy? Sort it by fuel and symptom, do the safe checks, know what gets fixed.

Continue reading →Suburban

Suburban Tankless Troubleshooting

A Suburban Nautilus on-demand RV water heater with no hot water: check flow, 12-volt power, and propane, read the code, and know when to call a tech.

Continue reading →Suburban

Suburban Water Heater Igniter: When It Needs Replacing

How to tell whether a Suburban DSI water heater's igniter is really the problem, what to check first, and what an RV technician does to replace it.

Continue reading →Suburban

Suburban Water Heater Not Working on Electric

Suburban RV water heater heats on propane but not electric? Check shore power, the breaker and switch, and the tank fill, then know what a tech tests.

Continue reading →Takagi

Takagi Code 111: Ignition Failure

Takagi error 111 means ignition failure. What Takagi's service sheets list as causes, what you can check safely, and when a technician is needed.

Continue reading →Takagi

Takagi Tankless Leaking: Find the Source

Water under a Takagi tankless can be condensate, relief valve discharge, a fitting, or the heat exchanger. How to tell them apart and what each means.

Continue reading →Takagi

Takagi Tankless Not Heating? Problems and Error Codes

Why a Takagi tankless won't heat or runs lukewarm, and what its three-digit error codes mean per Takagi's service sheets, with safe owner checks.

Continue reading →Takagi

Takagi Tankless Vibration While Firing

A Takagi tankless that vibrates or rattles while it runs usually has a mounting, piping, fan, or scale issue. How to narrow it down safely.

Continue reading →Truma

Truma AquaGo Problems: No Hot Water and Lockouts

Why a Truma AquaGo RV tankless heater gives cold water or locks out: 12-volt supply, LP, water flow, freezing, scale, and the fault codes it reports.

Continue reading →Truma

Truma Water Heater Flashing Light: AquaGo Codes

How to read the Truma AquaGo flashing yellow and red LEDs, what the common short-long codes mean, and when a single reset is appropriate.

Continue reading →U.S. Craftmaster

U.S. Craftmaster Water Heater Troubleshooting

Why a U.S. Craftmaster gas or electric tank heater goes cold, shows a status light, or leaks, what you can check yourself, and when it needs a new tank.

Continue reading →Unitrol

Unitrol Water Heater Gas Valve Troubleshooting

Why a Robertshaw Unitrol standing-pilot gas valve won't light or hold the pilot, why the burner won't come on, and when the valve needs replacing.

Continue reading →Whirlpool

Whirlpool Water Heater Temperature Sensor Failure

What a temperature sensor fault on a Whirlpool-branded gas or electric water heater means, why the heater shuts down, and how to confirm the code.

Continue reading →Rheem

Why Does My Rheem Water Heater Keep Turning Off?

A Rheem water heater that keeps shutting off has usually tripped a safety: pilot and thermopile, overheat limit, chamber or vapor sensor, or power vent.

Continue reading →Rheem

Why Is My Rheem Water Heater Not Heating?

A Rheem water heater that won't heat needs different checks for electric, gas, heat pump and tankless models. Start with the type, then the symptom.

Continue reading →