Rheem II Series Service Instructions Manual page 57

Thermistors: (Procedure 15)
Note: There are 4 Thermistors, one on the heat exchanger copper pipe outlet, two on the
inlet and outlet valve assemblies and an ambient air thermistor (part of the wiring harness).
1. Remove the front Panel.
Refer to Procedure 2.
2. Relieve water pressure through a hot
tap.
3. Locate the Thermistor requiring
replacement.
4. Disconnect the multi-pin plug from the Thermistor.
5. Remove the retaining screw(s) and withdraw the thermistor
taking care not to damage the O-ring (Note: With the exception of
the Ambient Air Thermistor, water may escape during this
procedure).
6. Reassemble in reverse order of above, replacing O-rings (items
412 and 432) if required.
Over Heat Limiter Assembly: (Procedure 16)
1. Remove the upper burner Assembly. Refer to Procedure 4.
2. Remove the 4 x screws retaining the Over Heat Limiter Assembly
to the Jacket back and remove the Over Heat Limiter Assembly.
3. Inspect the heat exchanger for holes or combustion damage.
4. Reassemble in reverse order of above (Note: Ensure all multi-pin plugs are reconnected
and all wiring is neatly repositioned and retained to prevent damage during operation).
5. Test operation of water heater and ensure the MIN and MAX burner gas pressures are
correct. Refer to Procedure on page 51.
Remote Controller: (Procedure 17)
1. Isolate power at the water heater.
2. Remove the small Philips head screw from the bottom of the Remote Controller.
3. Gently pivot the Remote Controller up from the bottom and then lift up and off upper
retaining lugs.
4. Kitchen Controller: Disconnect the wiring from the terminals on the back of the
Controller (Note: The wiring is not polarity sensitive).
Bathroom Controllers: Disconnect the multi-pin plug.
5. Reassemble in reverse order of above.
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"
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