Rheem RTGH-RH10DV Service Manual page 66

66
Error code
The circuit board has Fan Speed data. Before ignition, compare with standard Fan Speed before ignition
and error appears when exceeding standard range, stop all of the outputs except post-purge.
Meaning
Excess Fan Speed detected
(Manual restore)
Failure event
Check point
① Check APS and circuit board connection.
② Verify that the condensate trap and drain pipe are free of
obstructions.
③ Check the exhaust and intake pipes for blockage.
④ To reset this error code, the power needs to be disconnected
and then reconnected.
Chapter 4 Troubleshooting
Condition
When fan speed exceeds normal
values during combustion, error
code 41 will appear.