To test the defrost heater circuit resistance from the main control, use the blue wire at pin 2 and the bright orange wire at pin 9 on the wire connector for connection CON3. To test the defrost sensor, use the brown wire at pin 19 and the brown wire at pin 22 on the wire connector for connection CON7. To test the freezer sensor, use the blue wire with white stripe at pin 17 and the blue wire with white stripe at pin 20 on the wire connector for connection CON7.
