Water heaters
A.O. Smith error codes
A.O. Smith residential standard gas water heater status light (flash) codes, from A.O. Smith's own service handbook. Also covers AO Smith.
A.O. Smith water heater codes (8)
- 0 flashesControl off / pilot out
- SolidPilot recently went out
- 1 flashNormal operation
- 2 flashesThermopile voltage low
- 4 flashesTemperature exceeded (ECO)
- 5 flashesSensor failure
- 7 flashesInternal control failure
- 8 flashesPower off failure
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