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Error code reference
Honeywell Water Heater Error Codes
8 error codes documented with diagnostic procedures.
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0 FlashesControl is off or pilot is out.1 FlashNormal operation (bright/dim heartbeat).2 FlashesThermopile voltage low.4 FlashesTemperature exceeded (ECO activated).5 FlashesSensor failure.7 FlashesInternal control failure.8 FlashesPower off failure.Status Light On (solid)Pilot light was recently extinguished and the thermopile is cooling down.
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Step-by-step tests, expected values, wiring diagram references, and verified part numbers.
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