Rheem 70103 Service Instructions Manual page 51

Boiling Water Thermistor (Procedure 12)
6. Isolate power supply to BWU.
7. Remove jacket surround (refer to procedure 1).
8. Disconnect boiling water thermistor at wiring connector.
9. Withdraw boiling water thermistor from element dry well.
10. Complete reassembly in reverse order of above. If required, apply a small amount of
heat transfer paste to the boiling water thermistor before reinserting into dry well.
Level Probe (Procedure 13)
1. Isolate power supply to BWU.
2. Operate tap lever until water ceases to flow from tap.
3. Remove jacket surround (refer to procedure 1).
4. Disconnect wiring connector plug from level probe and withdraw probe from housing.
Note: level probe is a push fit o-ring seal.
5. Measure and cut the replacement probe to correct length as required
6. Complete reassembly in reverse order of above.
Control Board (Procedure 14)
3L & 5L BWU heat sinks are air cooled. 7L - 40L models heat sinks are water cooled.
1. Isolate power supply to BWU.
2. Operate tap lever until water ceases to flow from tap.
3. Remove jacket surround (refer to procedure 1).
4. Disconnect all wiring / wiring plugs from controller including timer ribbon cable.
5. Using a pair of long nose pliers, compress barbs on plastic mounting spacers and
remove controller from backing plate.
6. For 7 – 40L models only: Disconnect silicone tubes from top and bottom of heat sink
pipe and remove controller from BWU. Note: Silicone tubes are easier to remove if seal
has been cracked first by levering with a small flat bladed screwdriver.
7. Complete reassembly in reverse order of above ensuring silicone tubes are not kinked.
8. Check for leaks.
Terminal Block (Procedure 15)
1. Isolate power supply to BWU.
2. Remove jacket surround (refer to procedure 1).
3. Mark and disconnect wiring from terminal block.
4. Using a pair of long nose pliers, compress barbs on plastic mounting spacers located
underneath terminal block and remove terminal block.
5. Reassemble in reverse order of above.
TM063 701, 702 & 703 Series Boiling Water Unit Service Instructions
Revision D: Feb 2017
This document is stored and maintained electronically by
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled"
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