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C. Control Module Check
1. Control Module
Before replacing a CM that does not show a visible defect and that you suspect is bad,
conduct the following check procedure. This procedure will help you verify your diagnosis.
Always choose a neutral white (W) wire to establish a good power supply and neutral
connection to CM. Check that 115VAC is present between CM Live In black (BK) wire
and CM Neutral white (W) wire. Confirm defrost and cabinet thermistors are connected.
Cabinet Temperature
Control Dial
Setting Position
Neutral (W)
Power Supply (BK)
Compressor (V)
Evaporator Fan
Motor (BK-SM)
Defrost Heater (BK-SM)
Cabinet Temperature
Control Dial
Setting Position
Control Module
Cabinet Thermometer
(located on shelf)
Cabinet Temperature Control Dial
(Shown if "OFF" Position)
Control Dial
Fig. 1
20
Control Dial
Setting Position
PRB 2
Defrost
Thermistor
PRB 1
Cabinet
Thermistor
Red LED
Yellow LED
Green LED
Cabinet Temperature
Control Dial
Setting Position
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