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FREEZER CABINET THERMISTOR
Thermistor Condition Action
Open or shorted
▪ EE on display.
▪ Service wrench icon
flashes.
▪ Fault code logged.
▪ Compressor on 20
minutes and off 20
minutes.
High temperature offset
reached
Compressor energized, unless
in defrost five-minute delay.
Display temperature shows an
average of compartment
thermistor
Changes one degree per
minute.
Sabbath mode
15- to 25-second delay before
compressor starts.
Low offset
Compressor and evaporator
fan stopped.
During adaptive defrost
Freezer temperature display is
locked.
Freezer Cabinet Thermistor Test
1 Turn off power to the unit.
2 Follow the procedure in Component Removal and
Installation to expose the freezer cabinet thermistor.
3 Remove the thermistor from the freezer compartment clip.
4 Follow the procedure in Component Removal and
Installation to expose the control board.
5 Remove the thermistor harness from the control board.
6 Place the thermistor into an ice bath of 0°C. Let the
thermistor sit for five minutes, stirring occasionally.
7 Measure the resistance of the thermistor through the control
board connector.
8 If thermistor is outside the normal range of 30,000 to 33,000
ohms, replace it.
Built-In Freezer Evaporator Thermistor
The freezer evaporator (FE) thermistor senses the freezer
evaporator temperature and transmits it to the control board,
where it operates the evaporator fan.
FREEZER EVAPORATOR THERMISTOR
Thermistor Condition Action
Open or shorted
▪ EE for "FE" thermistor in
diagnostics.
▪ Service wrench icon
flashes.
▪ Fault code logged.
▪ Compressor energized
after five-minute defrost
delay, and evaporator fan
three minutes later.
Freezer evaporator
temperature above 2°C after
defrost
Evaporator fan does not start.
Freezer Evaporator Thermistor Test
1 Turn off power to the unit.
2 Follow the procedure in Component Removal and
Installation to expose the freezer evaporator thermistor.
3 Remove the thermistor from the freezer evaporator.
4 Follow the procedure in Component Removal and
Installation to expose the control board.
5 Remove the thermistor harness from the control board.
6 Place the thermistor into an ice bath of 0°C. Let the
thermistor sit for five minutes, stirring occasionally.
7 Measure the resistance of the thermistor through the control
board connector.
8 If thermistor is outside the normal range of 30,000 to 33,000
ohms, replace it.
COMPONENT
Built-In Condenser Fan Testing
The control board monitors the power output to both
compressors, and if either compressor is energized, the control
board closes the condenser fan relay/triac and supplies the
condenser fan with voltage. See the Technical Data section for
condenser fan rating.
1 While the condenser fan is running, stop the condenser fan
blade and determine if the condenser fan restarts. Repeat
this test at least six times. If the condenser fan does not
start or starts slowly, replace the condenser fan.
2 Disconnect the electrical connector from the condenser fan,
and measure the resistance of the condenser fan. The
resistance should be approximately 17 megaohms.
3 Connect the electrical connector and check for correct
voltage on the hot lead on the condenser fan connector to
ground.
ICBBI-42UFDID
Troubleshooting
BUILT-IN FREEZER CABINET THERMISTOR (continued)
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7041397 REVA 12/2017
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