Hubbell Electric Heater Company J - Manual (Page 33)

Ground Wire (J7) Display Cable Leak Detection Wire (J2) Probe Cable (J3)
Power Wire (Common, White) Connector (J5)
Power Wire (Black) Wire to #1 Contactor (yellow)
Wire to #2 Contactor (red)
3. Remove four (4) screws securing control board to panel.
4. Remove and replace control board.
5. Reconnect wires disconnected in step 2. NOTE: When reconnecting the ribbon cable,
be sure to have the key on the cable align with the slot in the connector.
6. Connect power to unit.
RELIEF VALVE
1. Disconnect power from unit.
2. Shut off incoming water supply.
3. Attach hose to drain connection.
4. Lift manual release lever on relief valve to let air into system or break union on
outgoing water line.
5. Drain water from tank.
6. Disconnect overflow piping.
7. Unscrew relief valve, remove assembly and replace with new one.
8. Connect overflow piping.
9. Turn on incoming water supply and check for leaks.
10. Connect power to unit.
P65 SENSOR PROBE
1. Disconnect power from the unit.
2. Unplug the P65 probe connector from the T1000 control board.
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Probe connection (J3)
3. Twist the cord and shrink-wrap end of the P65 probe (or cut the shrink-wrap with a
sharp knife) to loosen the P65 sensor assembly from the P65 thermowell.
4. Remove the old P65 sensor assembly by pulling on the cord coming out of the P65
thermowell.