Fault Finding Chart 3 - Rheem 871018 Service Instructions Manual

Fault Finding Chart 3

3
Operation switch
malfunction
Is error
code 24
displayed?
NO
Thermistor
malfunction
*Is error
code 31, 32, 33 or
34 displayed?
NO
Fan speed
abnormal
Is error
code 61
displayed?
NO
3.1
TM031 Integrity 18, 20, 24, 26L Service Instructions REV: B
D.O.I: February 2008
This document is stored and maintained electronically by
Ignition and Temperature Control
Is error
code 24 shown on
YES
error code display
also?
YES
*Is the
resistance of the
YES
relevant thermistor
normal?
Is
voltage being
YES
supplied to the fan
motor?
YES
Is
the fan motor
rotating?
YES
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled"
NO
Test 7
Also when
Min/Max button is
pressed?
Test 8
YES
*Thermistor error codes
31 = Water inlet thermistor
32 = Heat exchanger thermistor
33 = Hot water outlet thermistor
34 = Ambient air thermistor
NO
Test 9
NO
Test 10
Is a
pulse signal being
sent from the fan
motor?
YES
38
Replace the remote controller.
Release the Min/Max buttons and
YES
re-open a hot tap.
NO
Replace the PCB assembly.
Replace the relevant thermistor.
Replace the PCB assembly.
NO
NO Replace the fan motor assembly.
Replace the PCB assembly.