Service Guide

34
D. Thermistor Check
The cabinet thermistor is used for cabinet temperature control and the defrost thermistor
is used for defrost cycle initiation and termination. Thermistor resistance varies
depending on temperature. The control module monitors the thermistors to control
system operation. No adjustment is required.
In the event the cabinet thermistor reading is out of range (E1 alarm), the compressor
operates on a xed time basis of 5-min. on and 5-min. off.
In the event the refrigerator defrost thermistor reading is out of range (E2alarm), defrost
initiation occurs every 4-hr. of cumulative compressor run time and terminates on
20-min. minimum defrost timer.
In the event the freezer defrost thermistor reading is out of range (E2 alarm), defrost
initiation occurs every 4-hr. of cumulative compressor run time and terminates based on
cabinet thermistor temperature.
To check thermistor resistance, follow the steps below.
1) Move the power switch to the "OFF" position, then unplug the appliance from the
electrical outlet.
2) Remove the control box cover.
3) Disconnect and remove the thermistor in question.
4) Immerse the thermistor sensor portion in a glass containing ice and water for 2 to 3 min.
5) Check the resistance between the wires at the thermistor connector. Normal reading is
within 16.0 to 16.7 kΩ. If outside the normal reading, replace the thermistor.
6) Reconnect and replace the thermistor in its correct position. See "IV.B. Important Notes
for Component Replacement."
7) Plug the appliance back into the electrical outlet. Move the power switch to the "ON"
position.