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”
25
Hot tap closed
Operation Flow Chart 3
G.I.S.V (SVO) off
[S.V. 1-3 (SV1-3) off]
YES
NO
YES
P.G.F.R Valve at
minimum
4
5
Post Purge Shut Down Function
Water flow sensor off
Check gas cut off function by
alternating the closing order of gas
valves SVO and SV1-3 at each shut
down
Fan motor at
minimum
I.U.I. Off
S.V. 1-3 (SV1-3)
failure
80 Flashing
8 seconds la ter
NO
G.I.S.V (SV0) failure
51 Flashing
G.I.S.V (SVO) off
[S.V. 1-3 (SV1-3) off]
P.G.F.R Valve off
Fan off
YES
Abnormal combustion
Decreased air flow
NO
99 Flashing
Fan off
Isolate power
Locate and repair fault
Use procedure to
clear error code 99
S.V. 1 (SV1) off
S.V. 2 (SV2) off
S.V. 3 (SV3) off
Fan off
G.I.S.V (SV0) off
P.G.F.R valve off
Isolate power
Locate and repair fault
and restore power
10 seconds la ter
10 seconds la ter
Check gas cut off function by
alternating the closing order of gas
valves SVO and SV1-3 at each shut
down
Flame current
detected
< 0.1uA?
Fan motor speed
checked during
operation?
Fan motor
current check
OK?
Note: see page 22 for details on interpreting chart abbreviations.