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F. Thermistor Check
A thermistor (semiconductor) is used as a harvest control sensor and anti-slush sensor.
The resistance varies depending on the suction line temperatures. The thermistor
detects the temperature of the evaporator outlet to start the harvest timer or momentarily
stop the pump motor during the freeze cycle. No adjustment is required. If necessary,
check for resistance between thermistor leads, and visually check the thermistor
mounting, located on the suction line next to the evaporator outlet.
Temperature (°F) Temperature (°C) Resistance (kȍ)
0 -18 14.401
10 -12 10.613
32 0 6.000
50 10 3.871
70 21 2.474
90 32 1.633
Check a thermistor for resistance by using the following procedure:
1) Remove the air ¿ lter. Move the control switch to the “OFF” position, then unplug the
appliance.
2) Disconnect the connector K1 on the board.
3) Remove the thermistor.
4) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3
minutes.
5) Check for resistance between the thermistor leads. Normal reading is within 4.7 to 6.2
k. Replace the thermistor if it exceeds the normal reading.
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