190 Part Number 000014797 Rev02 05/18
WATER TROUGH THERMISTOR
Function
Thermistor resistance values change with temperature.
The value supplied to the control board is used to identify
temperature at the thermistor location.
When the resistance value indicates a temperature of 34°F
(1.1°C) the control board will delay the water pump for 25
seconds. When the water pump restarts the water inlet
valve will energize for 7 seconds then turn off.
NOTE: If the ice machine is experiencing long freeze cycle
shut down, we recommend removing the thermistor and
bracket permanently.
Check procedure
THERMISTOR
1. Disconnect thermistor from control board and
measure resistance.
2. Measure temperature at the thermistor.
3. Compare measured resistance/temperature readings
to resistance/temperature relationship chart.
A. Within 10% of the published resistance value
Thermistor is good
B. Not within 10% of the published resistance value
- Thermistor is defective.
CONTROL BOARD OPERATION
1. Disconnect thermistor from control board - The
control board thermistor LED will flash 1 second on
and 1 second off.
2. The control board will default to the 3.75 minute
pump delay in the freeze cycle.
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