Circuit Board - Rheem RTGH-RH10DV Service Manual

Condensing tankless gas water heater
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Chapter 4 Troubleshooting
Error code
During initialization or AGM check, the AGM motor rotates so that the position can be determined by the
circuit board. If there is a discrepancy between the movement of the motor and the circuit board's input (i.e.
AGM motor is stuck in one position and cannot rotate), Er. 67 is displayed.
Er. 67 must be cleared manually.
③ If above ①, ② operates abnormally replace AGM.
④ If AGM is moving normally after a hard reset but still doing an Er 67,
replace the circuit board with the newest version.
Meaning
AGM Abnormality
(Manual restore)
Failure event
Check point
Condition
Unable to sense proper positioning
of AGM motor, error code 67 will
appear.
① Check error code sign after turning off
and on the power.
② Check wiring line connection
carefully.
73

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