Service Manual

87
Service Procedure VII
Flame Sensor Testing and Replacement (Continued)
Flame Sensor Replacement Procedure
1. Position main power switch to OFF.
2. Disconnect (unplug) water heater from 120 volt power
source.
3. Unlatch and remove the surround cover from the top of
the water heater.
4. Fold back insulation in front of combustion assembly to
expose flame sensor (see image at right).
5. Disconnect the wire lead from the flame sensor.
6. Remove the two sensor mounting screws
(magnetic tip, long reach Phillips
screwdriver) and remove flame sensor and
gasket from the transition base flange.
7. Remove any residual gasket material from the transition base flange.
8. Install new flame sensor with new gasket provided using screws from step 6. Arrange the flame sensor
with hook towards the burner.
9. Reconnect the flame sensor wire.
10. Fold insulation back into place. Be sure no wires are in contact with the burner flange.
11. Restore 120 volt power supply to water heater and confirm proper operation following the lighting
instructions on the lighting instruction label or the lighting instructions located in the Installation and
Operating Instruction Manual.
12. Replace the surround cover on the top of the water heater.
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multimeter.
Flame
sensor
87