RV water heater troubleshooting by appliance type

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Identify the unit before following a procedure

Photograph the rating plate, control or display, and the exact symptom. Model generations can use different controls and code meanings even when the brand name is the same.

Choose the heater typeGas tank, electric tank, tankless, heat pump, indirect, or RV.
Record the exact clueCode, flash count, leak location, sound, or timing.
Use the closest guideConfirm every model-specific step against the label or manual.

RV

40 guides

Airstream Water Heater Troubleshooting

Airstream coaches use Atwood/Dometic, Truma, or Suburban heaters. Identify the unit behind the exterior door, then follow the right checks.

Alde RV Water Heater Problems

Alde no-heat is glycol, 12 V, mixing valve, or a lockout — not an Atwood tank. Photograph the panel.

Alde Water Heater Not Working: RV Fixes

Alde Compact hot water failures come from 12 V power, low or air-locked glycol, LP supply, pump, or a panel lockout. How to narrow it safely.

Aqua-Hot Water Heater Problems

Aqua-Hot no-heat faults usually come from power, diesel, boiler fluid, or circulation. Check the display.

Atwood / Dometic

Atwood Clicking But Not Lighting

Atwood/Dometic click with no flame is spark without LP, a dead ECO, or a failed solenoid. Test spark with gas off.

Atwood / Dometic

Atwood Electric Water Heater Not Working

Atwood/Dometic electric heat dies from a tripped ECO, bypass valve, dead element, or no 120V. Reset safely.

Atwood / Dometic

Atwood RV Water Heater Troubleshooting

Atwood/Dometic RV water heater not working? Split the problem into gas, electric, ECO, or bypass, then follow the matching checks.

Atwood / Dometic

Atwood Water Heater Reset Button Location

The Atwood/Dometic reset is the ECO behind the exterior door. Where to find it, how to press it safely, and why a thermal fuse isn't a reset.

Atwood / Dometic

Atwood Water Heater Will Not Stay Lit

An Atwood/Dometic that lights and then dies is losing flame: low LP, a dirty sense electrode, an ECO trip, or an open thermal fuse.

Broken RV Water Heater Sight Glass

A cracked Suburban or Atwood sight window can dump LP into the bay. Shut the bottles. Do not spark it.

Atwood / Dometic

Dometic Water Heater Thermal Fuse Blown

An Atwood/Dometic thermal fuse opens from flame rollout, a blocked flue, or overheating. Find the cause before replacing it; never jumper it.

Forest River Electric Water Heater Dead

Forest River coaches use Suburban or Atwood heaters. Electric mode fails from no 120 V, bypass valve position, or a tripped ECO.

Forest River Heater Dead? Read the Door Badge

Forest River coaches use Suburban, Atwood, or tankless — not a Forest River OEM tank. Identify the door.

Furrion Tankless E1 Ignition Failure

Furrion tankless E1 means ignition failure: the board never proved flame. Causes include LP supply, low 12 V, spark, or the flame probe.

Furrion Tankless Water Heater Troubleshooting

A Furrion tankless that is cold or flashing E1 needs power, flow, gas, or ignition checks. Photograph the code.

Girard Tankless Reset Button: Clear a Lockout

How to clear a Girard GSWH-2 lockout with a faucet or 12 V reset, when one reset is reasonable, and which codes or smells mean stop.

Girard Tankless Troubleshooting: Codes & Lockouts

Girard RV tankless not heating? Most cases are an E1/E2 ignition lockout, low 12 V, an ECO trip, a probe fault, or freeze mode. What each means.

Grand Design Heater Dead? Read the Door Badge

Grand Design coaches use Suburban, Atwood/Dometic, or tankless heaters. Identify the unit behind the door, then check bypass, ECO, LP, and 12 V.

How to Reset a Suburban RV Water Heater

Reset a Suburban ECO once with a full tank, or cycle DSI lockout after you find the cause. Repeat trips mean

Jay Flight Heater Dead? Read the Door Badge

Jay Flight trailers use Suburban, Atwood/Dometic, or tankless heaters. Identify yours, then check the bypass, ECO, LP, 12 V, and ignition board.

Keystone RV Electric Water Heater Dead

Keystone RVs use Suburban or Atwood/Dometic heaters. Electric mode fails from no 120 V, bypass position, a tripped ECO, or a failed element.

Oasis Heater Dead? Name the Module First

On motorhomes, Oasis usually means an ITR diesel hydronic system. Cold showers trace to coolant, flame-out, 12 V, the pump, or a mixing valve.

Atwood / Dometic

Replacing an Atwood Water Heater Element

Atwood/Dometic RV elements are 120 V, around 1400 W. How to test one with power off, what else stops electric heat, and when to stop.

RV Water Heater Fault Light On

The red light on an RV water heater switch usually means a DSI ignition lockout. What it means, one safe reset, and when to stop.

RV Water Heater Fires Up Then Goes Out

An RV water heater that lights and then goes out is losing flame: low LP, a dirty sense electrode, an ECO or thermal fuse, or a regulator issue.

RV Water Heater Leaking From the Bottom

Water at the bottom of an RV water heater can come from the drain plug, P&T valve, anode, bypass fitting, or the tank. How to find the source.

RV Water Heater Leaking Outside

Water under an RV water heater door can come from the drain plug, T&P, anode, element gasket, or the tank. How to find the wet part.

RV Water Heater Not Getting Hot Enough

Lukewarm RV hot water is usually a half-open bypass valve, one heat source not working, or a mixing valve. How to find the cause.

RV Water Heater Pressure Relief Dripping

An RV water heater relief valve that drips usually reacts to high city-water pressure, heating without an air pocket, or a dirty seat.

RV Water Heater Smells Like Rotten Eggs

Rotten-egg smell only in RV hot water usually comes from the anode or stagnant water. The same smell in the air may be propane. How to tell.

Suburban Igniter Clicking With No Spark

Suburban DSI click with no flame is a cracked electrode, melted wire, or lockout. Test spark with LP off.

Suburban RV Heater Not Working on Gas

If a Suburban RV heater works on electric but not propane, record the model and ignition sequence. Leave spark and fuel-system tests to a technician.

Suburban RV Water Heater Leaking

A leaking Suburban RV heater may be a plug, relief valve, fitting, or split tank. Shut it down safely.

Suburban SW10DE Troubleshooting Guide

Suburban SW10DE not heating on gas or electric? Check the ECO, bypass valves, shore power, DSI board, and igniter, starting with a full tank.

Suburban SW6DE Troubleshooting Guide

Suburban SW6DE not heating on gas, electric, or both? Check the ECO, bypass valves, shore power, and DSI ignition, and never heat an empty tank.

Suburban Tankless Troubleshooting

A Suburban Nautilus tankless not heating usually has an E1/E2 ignition lockout, low flow, low 12 V, an overheat code, or freeze damage.

Suburban Water Heater Not Working on Electric

Suburban works on gas but not electric? Suspect no 120 V, bypass valves, a tripped ECO, or a failed element. How to check safely.

Thor Water Heater Dead? Read the Door Badge

Thor coaches use Suburban, Atwood/Dometic, Truma, or other tankless heaters. Identify the unit behind the exterior door before troubleshooting.

Truma AquaGo Problems: Field Fixes

AquaGo no-heat is 12V, LP, the water filter, freeze lock, or ignition — not a generic RV tank. Decode it.

Truma Water Heater Flashing Light Codes

A flashing Truma AquaGo or Combi light signals a lockout or warning. How to read the blink pattern or code, and when one reset is reasonable.

Troubleshooting

2 guides

Troubleshooting

Water Heater Switch Not Working

A water heater switch that does nothing may be a tripped disconnect, a blown fused pullout, an RV rocker switch, or a tripped breaker.

Troubleshooting

Water Heater Thermal Fuse Open

A water heater thermal fuse means different parts on tankless, RV, gas, and electric units. What an open fuse means and why it's never bypassed.