Fault Finding Chart 3.7; Fault Finding Charts 4 And 4.1 - Rheem II Series Service Instructions Manual

Fault Finding Chart 3.7

3.7
Outlet water
temp too high
Is error code 15
YES
displayed?
NO
Fan current detecting
circuit failure
Is error code
YES
79 displayed?

Fault Finding Charts 4 and 4.1

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