Brand guide
All Rheem water heater guides
Choose the symptom or code that matches your unit. Confirm the exact model and control generation against the rating plate before following model-specific instructions.
Rheem A108 Error: Condensate Blocked
Rheem hybrid A108 means the condensate sensor is wet or the drain is blocked. How to clear the drain safely and when a repeat code needs a pro.
Error codes and flashing lightsRheem Blue Light Flashing 7 Times
Seven flashes on a Rheem, Ruud, or Richmond gas control indicates a lockout, often FVIR related. What it means and why it must not be bypassed.
Pilot and ignition problemsRheem Code 11: Ignition Failure
Code 11 on a Rheem tankless means ignition failure: the unit never proved flame. Common causes, one safe reset, and when to call a technician.
Pilot and ignition problemsRheem Failed Ignition Lockout
A Rheem failed-ignition lockout means spark or glow didn't produce proven flame. How to read the LED or code and when a reset is appropriate.
Pilot and ignition problemsRheem Gas Control or Valve Failure
Rheem gas control faults usually come from a weak thermocouple or thermopile, an LED lockout, a clogged flame arrestor, or a failed valve.
No hot waterRheem Heat Pump Water Heater Problems
A Rheem hybrid not heating may have a dirty filter, vacation mode, an EcoNet code, a tripped ECO, a failed element, or a compressor lockout.
Pilot and ignition problemsRheem Pilot Light Will Not Stay Lit
A Rheem pilot that dies is a thermocouple, FVIR screen, or gas valve — not a ritual relight. If you smell gas, leave and call a pro.
Leaks and floodingRheem Plastic Drain Valve Leaking
Locate a possible Rheem drain-valve leak without forcing the valve. Distinguish tracked water, a leaking outlet, and a tank problem.
GasRheem Pressure Switch Failed Open
Pressure switch failed open on a Rheem power-vent means draft was never proven: a blocked vent, condensate, a cracked hose, or a failed blower.
Error codes and flashing lightsRheem Red Light Flashing 9 Times
Nine red flashes on a Rheem, Ruud, or Richmond gas control is a lockout, usually the chamber temperature sensor. What it means and next steps.
Pilot and ignition problemsRheem Tankless Error Code 12: Flame Loss
Rheem tankless code 12 means the burner lit and then lost flame. Common causes like gas supply and venting, a safe reset, and when to stop.
Leaks and floodingRheem Tankless Leaking Inside the Cabinet
Water inside a Rheem tankless cabinet can be condensate, relief valve discharge, an O-ring, or the heat exchanger. How to identify the source.
Leaks and floodingRheem Tankless Smells Like Gas? Leave
A gas smell at a Rheem tankless should be treated as a leak until a professional says otherwise. What to do, and which odors aren't gas.
Pilot and ignition problemsRheem Tankless Water Heater Flashing 11
Rheem tankless code 11 means ignition failure: no flame was proven. Common causes like a closed gas cock or dirty flame rod, and one safe reset.
Error codes and flashing lightsRheem Tankless Water Heater Troubleshooting
A Rheem tankless that won't heat usually has a power, flow, lockout, freeze, or gas problem. What codes 11, 12, and 14 mean.
Pilot and ignition problemsRheem Thermopile Voltage Low
Low thermopile voltage on a Rheem millivolt gas valve can shut off the burner or darken the LED. Causes, what to check, and when to call a pro.
Pilot and ignition problemsRheem Water Heater Keeps Turning Off
A Rheem that heats and then shuts off has tripped a safety: an ECO, FVIR, thermopile, pressure switch, or tankless lockout. How to find which.
Pilot and ignition problemsRheem Water Heater No Status Light
A dark Rheem status light can mean no 240 V, a failed thermostat or ECO on electric models, or a pilot, thermopile, or control fault on gas.
No hot waterRheem Water Heater Not Heating
A Rheem not heating needs different checks for gas and electric: breaker, ECO, elements, and thermostat, or pilot, FVIR, and gas control.
Leaks and floodingRheem Water Heater Smells Like Gas? Leave
A gas smell at a Rheem, Ruud, or Richmond water heater should be treated as a leak. What to do right away, and which smells are not fuel.
Pilot and ignition problemsRheem Water Heater Won't Light
A Rheem gas water heater that won't light usually has a closed gas cock, empty LP, a lockout, a failed igniter, or no gas supply.