Service Manual

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25
Service Procedure I:
Thermostat Circuit Testing and Replacement
Thermostat Sensor (Thermister) Replacement Procedure
1. Position main power switch to OFF.
2. Disconnect (unplug) water heater from 120 volt power source.
3. Unlatch and remove the top surround cover from top of heater.
4. Disconnect the temperature sensor from control (see images below).
5. Unclip the sensor from well and pull sensor to remove, do NOT remove well (see image).
6. Install new sensor assembly into well and reinstall senor clip.
7. Reconnect the sensor connector to the control board and route the wire harness through the same path that
it was removed.
8. Restore 120 volt power supply and water supply to water heater, check and repair any leaks found. Confirm
proper operation following the lighting instructions on the lighting instruction label or the lighting instruction
located in the Installation and Operating Instruction Manual.
9. Replace the surround cover on the top of the water heater.
Disconnect sensor
harness from
control board
120 volt potential exposure.
Isolate the appliance and
reconfirm power is disconnected
using a multi-meter.
WARNING
Sensor clip sown
properly installed
Sensor shown fully
inserted into well