Error Code 65; Error Code 66 - Rheem 874W27NF Service Manual

Error Code 65

Water Volume Control Motor fault.
Error Code 65
Isolate power to unit for 10
seconds and restore power.
Is the voltage to the water
volume control motor normal?
TEST 20
YES
When motor operates, is the
voltage to the water volume
control motor normal?
TEST 21
YES
Replace water volume control
assembly.

Error Code 66

Water Bypass Control Motor fault.
Error Code 66
Isolate power to unit for 10
seconds and restore power.
Is the voltage to the water
bypass control motor normal?
TEST 22
YES
When motor operates, is the
voltage to the water bypass
control motor normal?
TEST 23
YES
Replace water bypass control
assembly.
TM061 Rheem 27 Water Star Service Instructions – Issued: 11/10
REV A Issued 08/13
This document is stored and maintained electronically by
NO
NO
NO
NO
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled"
Check wiring, if intact replace the
control PCB.
Check wiring, if intact replace the
control PCB.
Check wiring, if intact replace the
control PCB.
Check wiring, if intact replace the
control PCB.
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