Rheem GHE100SU - Troubleshooting Error Codes; Anode Wiring Harness Continuity Test

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Before You Call For Service…
Alarm (‘A’)
and Alert
(‘T’) Codes
Description Current Alarm Screen Display
A025
Control does not detect blower RPM. This will disable
the heater.
A025 No Blower RPM feedback. Call Tech Service
->Please contact technical support or service
provider.
A026
Blower RPM feedback (actual RPM) is ≥300 RPM from
desired RPM for > 1 minute.
A026 Blower expected RPM vs actual RPM mismatch
->Please contact technical support or service
provider.
A027
Flame current detected prior to opening gas valve. This
will disable the heater.
A027 Flame present before ignit. Call Tech Svc
->Clear error code by turning the unit o󰀨 and on. If
problem persists please contact technical support or
service provider.
A028
Flame current detected 10 seconds after closing gas
valve. This will disable the heater.
A028 Flame present w/o heating. Call Tech Svc.
->Clear error code by turning the unit o󰀨 and on. If
problem persists please contact technical support or
service provider.
A029 Unit did not ignite. A029 Failed ignition. Retrying.
A030 Unit lost ame. A030 Flame lost during heating. Retrying.
A031
Powered anode control is no longer communicating
with the ignition control. This will override any other
anode based alarms.
A031 Powered Anode Communication failure
->Unit will continue to operate. Please contact your
qualied service provider.
T032 Lower (inlet) thermistor analog to digital converter fault.
T032 Lower Tank temp A/D error. Call Tech Svc.
->If problem persists, please contact technical sup-
port or service provider.
A033
Exhaust ue thermistor analog to digital converter fault.
This will disable the heater.
A033 Flue sensor A/D error. Call Tech Service.
->If problem persists, please contact technical sup-
port or service provider.
A034
Upper tank thermistor analog to digital converter fault.
This will disable the heater.
A034 Upper Tank temp A/D error. Call Tech Svc.
->If problem persists, please contact technical sup-
port or service provider.
T035
Gas relay #1 contacts did not close. The unit will contin-
ue to try and close the relay to initiate combustion.
A035 Gas Relay 1 stuck open. Call Tech Service
->If problem persists, please contact technical sup-
port or service provider.
A036
Gas relay #1 stuck closed. This could inadvertently
allow the gas valve to open. This will disable the
heater.
A036 Gas Relay 1 stuck closed. Call Tech Svc.
->If problem persists, please contact technical sup-
port or service provider.