Service Manual

Service Procedure I:

Thermostat Circuit Testing and Replacement (Continued)

Thermostat Sensor (Thermistor)

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 the top of the water heater.

4. Unclip sensor connector from the control board and remove the harness from the control panel (see

below images).

5. Unclip sensor from the well and pull the sensor to remove, do NOT remove well.

6. Install new sensor assembly into well and reinstall the sensor 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 the water heater, check and repair any leaks

found. Confirm proper operation following the lighting instruction label or the lighting instructions

located in the Installation and Operating Instruction Manual.

9. Replace the surround cover on the top of the water heater.

Remove sensor

connector from

control board

Sensor shown fully

inserted into well

Sensor clip shown

properly installed

WARNING

120 volt potential exposure. Use caution

making voltage checks to avoid personal injury.