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Appliance

Water Heater error codes

Tank and tankless water heater fault codes for gas, electric, and recirculation faults.

47 codes indexed

Pick your brand, then your model family

47 codes across 3 model families. The model family matters, because two water heater models from the same brand can read the same number as two different faults.

Bosch

16 codes

Therm 250SX, GWH 635ES and 2400E gas tankless

16 codes

Condensing gas tankless platform with a condensing heat exchanger, an induction fan and a flue gas limiter. Four of its codes, A2, A7, A9 and C1, mean something completely different on the Greentherm T9000 platform, and the gas pressure ranges published for it differ from the T9000 ranges, so the code has to be read against the model family rather than as a Bosch code.

8EBoschElectrical noise reported on the control boardA2BoschOverheat protection tripped, flue gas limiter or overheat fuseA7BoschHot water temperature sensor fault or out of rangeA9BoschOutlet temperature sensor not seeing the set temperatureC1BoschFan rotation too low at start-upC6BoschFan rotation too low during operationC7BoschNo fan speed signal from the fanCABoschWater flow above the specified maximumE0BoschControl board software or hardware failureE1BoschOver temperature at the hot water sensorE2BoschInlet temperature sensor faultE9BoschOverheat sensor opened circuitEABoschNo ionization during the safety time, failed to igniteECBoschLoss of burner flame while burningF7BoschFlame sensed while the unit is in standbyFABoschGas valve not closing the gas circuit

Bradford White

19 codes

Ultra Low NOx D series gas

19 codes

Atmospheric gas water heater with a flue damper and a Honeywell WV4472 electronic gas control, which reports faults as a counted LED flash with a three second pause between repeats. The damper codes have no equivalent on units that do not have one, and the codes are not shared with the condensing platforms of other brands.

HeartbeatBradford WhiteNot a faultThermostat calling for heat, normal operationNo lightBradford WhiteNot a faultNo status light, unit is not powered1 flash every 2 secondsBradford WhiteNot a faultStandby, waiting for a call for heat2 flashesBradford WhiteFlue damper test circuit not working, damper stuck open3 flashesBradford WhiteFlue damper test circuit not working, damper not fully open4 flashesBradford WhiteExcessive tank temperature5 flashesBradford WhiteUndesired false pilot flame present7 flashesBradford WhiteFlammable vapour sensor or resettable thermal switch fault61 flashBradford WhiteFailed to light the pilot, unit auto resets62 flashesBradford WhiteFlue damper moved off fully open during the run63 flashesBradford WhitePilot flame extinguished, unit auto resets64 flashesBradford WhiteUndesired false pilot flame sensed, unit auto resets81 flashBradford WhiteFlammable vapour sensor out of specification82 flashesBradford WhiteTemperature sensor fault83 flashesBradford WhiteGas control electronics fault84 flashesBradford WhiteGas valve fault detected91 flashBradford WhiteInsufficient combustion air detected92 flashesBradford WhiteCombustion chamber temperature sensor out of specificationWeak pilot signalBradford WhiteWeak pilot signal on the last call for heat

AO Smith

12 codes