IMPORTANT NOTE: This procedure assumes a cool tank
WARNING
120 volt potential exposure. Usecaution making voltage checksto avoid personal injury.CAUTION
Use caution not to damage
connectors when making voltage
measurements or jumping
terminals
WARNING
Do not reset the display from the hard lockout
state without correcting the cause of the
overheating condition
Check continuity of wire harness to sensor. Resistance of harness
should be close to 0 ohms. Replace wire harness if high resistance
is measured (over 0.5 ohms) Check wires for intermittent
connections, shorts, frayed insulation. Replace if necessary
Turn power ON to water heater.
Run water heater through heating cycle and verify proper operation.
Sensor temperature can be viewed when burner shuts off (see
section on viewing the display in “Service Mode”).
Turn power “OFF”.
Draw water to cool tank below 120 °F
Check sensor. Sensor is held in place with a clip fastened to the well
(see photo). Check sensor wire for potential damage or breaks in the
wire insulation. Is the sensor fully inserted into the well?
Check Sensor Resistance
(See Sensor Resistance
Testing, following section)
Y
N
Condition: Water Heater Not Operating
Display shows error code “65”
High Water Temperature (over 200 °F)
If wire harness is O.K., check sensor resistance detailed in
“Appendix - A: sensor resistance at various temperatures” at the end
of the thermostat testing and replacement section. Replace sensor if
needed.
Unplug or disconnect electrical power to the water heater
Condition: Water Heater Not Operating
Display shows error code “32” ( Sensor Reading
Faulty)
Continued on
next page
If sensor clip is damaged
replace clip. Replace
sensor if damaged.
Sensor shown fully
inserted into well
Sensor clip shown
installed properly
Checking continuity of
sensor (disconnected
at Control Board)
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Serial Numbers including and AFTER
GB13006174 and ALL EFR models
(Excluding EF100T399 model series).
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