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”
46
Fault Finding Chart 3.7
Fault Finding Charts 4 and 4.1
3.7
YES
YES
YES
Set the outlet temp to 70ºC
NO
YES
**Error code 15 will occur if the outlet
water temp exceeds 20º above the
set point -3ºC. 60+20-3=77ºC
Replace the proportional gas flow
regulating valve.
YES
NO
Test 10
Outlet water
temp too high
Replace the PCB assembly.
Is error code 15
displayed?
*Is the unit used as
an in-series gas
booster?
Is the outlet temp
set at 70ºC ?
**Is the Inlet
water temp >
77ºC?
Does the proportional
gas flow regulating
valve test normal?
Fan current detecting
circuit failure
2
Replace the PCB assembly.
Note: only replace the PCB
assembly if error code 79 is
displayed during combustion.
YES
Is error code
79 displayed?
Was error code 79
displayed prior to
opening the hot tap?
YES
NO
NO
NO
NO
1y = Water flow detected
by water flow sensor
4
Test 3
NO
Read maintenance
information 1y
YES
NO
Replace the PCB assembly.
Replace the water flow sensor. If
the fault persists replace the
water body assembly.
YES
Controllers must not be fitted
when a continuous flow water
heater is used as an in-series
gas booster. Remove
controllers.
YES
NO
4.1
4.2
NO
Free the flow sensor turbine.
YES
NO
Is the voltage
between F16 & 18
normal?
Are the test results
normal?
YES
YES
NO
Is the unit used as
an in-series gas booster?
Are controllers fitted?
Is the flow sensor
turbine jammed?
Test 3
Is the water flow
more than 3 litres/
min?