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K. Removal and Replacement of Thermistors
This section covers removal and replacement of the cabinet and defrot thermistors. For a
thermistor check procedure, see "IV.C. Thermistor Check."
CAUTION
1. The thermistors are fragile; handle very carefully.
2. Do not shorten or cut the thermistor leads.
1. Cabinet Thermistor
1) Raise the front panel. Move the power switch to the "OFF" position, then unplug the unit.
2) Remove the evaporator case cover.
3) Remove the control box cover.
4) Disconnect the cabinet thermistor (gray (GY) wires) from the RED K4 connector on the
control box.
5) Remove the cabinet thermistor from the thermistor bracket. Remove the thermistor.
6) Place the new cabinet thermistor in the thermistor bracket. Then, route the thermistor
connector to the control box.
7) Connect the cabinet thermistor (gray (GY) to the RED K4 connector on the control
board.
8) Replace the evaporator case cover and control box cover.
9) Plug the unit back in. Move the power switch to the "ON" position.
10) Close the front panel.
2. Defrost Thermistor
1) Raise the front panel. Move the power switch to the "OFF" position, then unplug the unit.
2) Remove the evaporator case cover.
3) Remove the control box cover.
4) Disconnect the defrost thermistor connector (orange (O) wires) from the WHITE K3
connector on the control box.
5) Remove the defrost thermistor clip from the evaporator (note the location in the
evaporator). Remove the defrost thermistor from the defrost thermistor clip.
6) Place the new defrost thermistor in the defrost thermistor clip, then insert it back into its
original position in the evaporator. Route the defrost thermistor connector to the control
box.
7) Connect the defrost thermistor connector (orange (O) wires) to the WHITE K3 connector
on the control board.
8) Replace the evaporator case cover and control box cover.
9) Plug the unit back in. Move the power switch to the "ON" position.
10) Close the front panel.
