A.O. Smith Waterheater Error Codes

All A.O. Smith waterheater error codes with step-by-step troubleshooting, multimeter specs, and OEM part numbers.

1 error codes

Code	Meaning	Severity	Difficulty
NO-HEAT	Something broke the heating circuit. On electric units, power either isn't reaching the elements or the elements themselves are toast. Gas units usually mean the pilot's out, the thermocouple gave up, or the gas valve stopped doing its job. Either way, no heat transfer is happening inside that tank. highintermediate	high	intermediate