Rheem 862 27 Series Service Instructions Manual page 72

Water Body Assembly: (Procedure 13)
Do not attempt to dismantle the servomotor, this is factory calibrated.
Adjustments will render the water heater either inoperable or cause incorrect
water temperature delivery.
1. Isolate power and water supplies.
2. Unscrew the water drain plug and pressure relief valve and drain the water heater.
3. Remove front cover and water bypass control assembly. Refer to procedures 1 and 12.
4. Remove the stainless steel spring clip that connects the water volume control assembly
to the cold water inlet connection.
5. Remove the black protective cover from the top of the water volume control assembly to
expose the multi-pin connector. Disconnect multi-pin connector from the volume control.
6. Disconnect the multi-pin connector from terminal S, on control PCB. Note: Some wiring
harnesses will need to be removed in order to release the water flow sensor cables.
7. Disconnect the cold water inlet thermistor from water volume control assembly by
removing the retaining screw.
8. Remove water volume control assembly from heater cabinet.
9. Reassemble in reverse order of above. Ensure an O-ring is fitted to each of the
connections on the water volume control assembly. Note: When replacing the water
body assembly it is important to ensure that the correct PCB is installed as fitment of an
incorrect PCB will result in unit malfunction. There are two PCB options available and
the correct type to use is dependent on the type of water body assembly that is installed
i.e. if the water body has a black plug on the flow sensor wiring loom, the PCB must have
a matching black socket, refer TB18-001 for further details.
Flow Sensor Turbine: (Procedure 14)
1. Isolate power and water supplies.
2. Remove the front panel. Refer to procedure 1.
3. Unscrew the water drain plug and pressure relief valve and drain the water heater.
4. Disconnect the cold water supply pipe from the cold water inlet connection.
5. Remove the stainless steel spring clip that connects the water volume control assembly
to the cold water inlet connection
6. Remove the four screws from the cold water inlet connection on the underside of the
heater cabinet and withdraw the inlet connector from the base of the water heater.
7. From the underside of the heater cabinet, gently withdraw the flow sensor turbine from
the inlet of the water volume control motor assembly by using a pair of long nose pliers.
8. Reassemble in reverse order of above. Ensure turbine is correctly centred and all o'rings
are fitted.
TM049 27L Continuous Flow Service Instructions
REV AL – Issued April 2019
This document is stored and maintained electronically by Rheem Technical Support. All printed copies are deemed "uncontrolled".
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