
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”
24
F1
G.I.S.V (SVO) ON
11 Flashing
11
Operational Flow Chart 2
Igniter ON
P.G.F.R Valve Min
12
S.V. 2 (SV2) ON
13
P.G.F.R Valve SI
10
Igniter OFF
S.V. 3 (SV3) OFF
P.G.F.R Valve OFF
S.V. 2 (SV2) OFF
S.V. 1 (SV1) OFF
I.U.I. Off
Lea kag e >
than 0.1uA
NO
3 sec later
YES
I.U.I. ON
Igniter OFF
YES
Proportional t emp adjust ment
Hot water volume adjustment
14
10 Flashing
YES
74, 75 or 76 Flashing
3
32 Flashing
33 Flashing
35 Flashing
14 Flashing
15 Flashing
31 Flashing
99 Flashing
52 Flashing
71 Flashing
79 Flashing
61 Flashing
81 Flashing
65 Flashing
NO
B
P.G.F.R.
control fail ure
Water i nlet
thermistor
disconnected
Decrease of
fan mo tor
ventilation
(ope rati on stop)
Heat
exchanger
thermistor
disconnected
Heat
exchanger
water temp >
140 C
O.H.L.
Working
Thermistor
connections
crossed
Hot water
outlet
thermistor
disconnected
G.I.S.V.
S.V.1~3
O.H.L.
control fail ure
Failure to det ect
fan mot or current
Fan fai lure
False flame
detectio n
Malfunctio n o f
water volu me
control mo tor
S.V.2 (SV2) OFF
Igniter OFF
12 Flashing
A
NO
34 Flashing
NO
S.V. 3 (SV3) OFF
P.G.F.R Valve OFF
S.V. 2 (SV2) OFF
S.V. 1 (SV1) OFF
I.U.I. Off
Flame failure
8
E
YES
NO
16
15
Gas rate change-over
done by solenoid valves
YES
4
Flame Detected?
Fifth ignition trial?
Fan ventilation
warning
Communication issue
with remote cont roller &
heat er
YES
Ambien t air
thermistor
disconnected
YES
Safety device
working
Outlet temp > set
temp
NO
Fifth flame
failure
NO
F2
G.I.S.V. (SV0) OFF
G.I.S.V. (SV0) OFF
G.I.S.V. (SV0) OFF
NO
Shut down
YES
YES
OFC 1
OFC 1
Note: see page 22 for details on interpreting chart abbreviations.