GE PSC21MGM, Technical Service Manual

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Dispenser Board
No self diagnostic tests exist for the dispenser board. Dispenser board operation is tested by pressing
each button and checking for proper operation.
Control and Sensor System Self-Test (0 7)
This test checks all five thermistors located throughout the unit. Once the test is initiated, the test code
(0 7) will stop flashing and the thermistor test results will appear on the freezer display in the test order
listed below. The thermistor test sequence number will not be shown on the display.
If the unit is not equipped with the Quick Chill option, the third thermistor (quick chill) will display a 0 and
3 audible beeps will sound at the temperature control panel. This is not a failure if the unit is not
equipped with the Quick Chill option.
Thermistor test results:
•
P = Pass
•
0 = Failed
• S = Short to 5 VDC
•
B = Bad amplifier
Thermistor test sequence is:
1. Fresh food top thermistor
2. Fresh food bottom thermistor
3. Quick chill thermistor (displays 0 if unit is not equipped with Quick Chill option)
4. Evaporator thermistor
5. Freezer thermistor
Note: Thermistor test results will be displayed in the sequence shown above. The thermistor test
sequence number will not be shown on the display.