TM090 12-26 Series II CFGWH Service Instructions
REV AB
– Issued February 2019
This document is stored and maintained electronically by Rheem Technical Support. All printed copies
are deemed “uncontrolled”
43
Fault Finding Chart 3.2
YES
Test 11
NO
Open the gas isolation valve.
NO
Replace the PCB assembly.
NO
Replace the proportional gas flow
regulating valve assembly.
NO
Replace the PCB assembly.
NO
Test 13 &16
YES
NO
Set burner pressure correctly.
Clean the burner if necessary.
YES
3.2
Replace the proportional gas flow
regulating valve assembly.
YES
NO
YES
Test 11
YES
YES
YES
Test 10
Replace the burner change over
assembly.
NO
Is gas available?
Is the gas pressure
correct at the
burner test point?
Is there voltage at the
gas inlet solenoid
valve?
Test 13 &16
Test 10
Is the resistance of the
gas inlet solenoid valve
normal?
Is there voltage at
solenoid valves 1, 2
& 3?
Is the resistance of
the solenoid valves
1, 2 & 3 normal?
Is there voltage at the
proportional gas flow
regulating valve?
Is the resistance of
the proportional gas
flow regulating valve
normal?
Is dynamic inlet gas
pressure correct?
Gas supply issue.
Check gas regulator, pipe sizing etc.
NO
YES