Customer Questions and Answers for Refrigerator Defrost Control Board by Whirlpool

Cordell, Your refrigerator has an ADC Board There are two methods to test it : The refrigerator/freezer defrost system can be checked by manually initiating a defrost cycle. There are two methods of initiating the ADC Test Mode. "First Test Method: 1. Turn the thermostat off for 15 seconds. 2. Turn the thermostat on for 5 seconds. 3. Turn the thermostat off for 15 seconds. 4. Turn the thermostat on for 5 seconds. 5. Turn the thermostat off for 15 seconds. 6. Turn the thermostat on for 5 seconds. 7. Turn the thermostat off. In 3 to 8 seconds the ADC should turn on the defrost heater (with the bimetal closed). NOTE: The test mode will terminate when the bimetal opens. Second Test Method: 1. Disconnect the refrigerator/freezer from the wall outlet for at least 30 seconds. 2. Turn the thermostat off. 3. Reconnect power to the refrigerator/freezer. Within 3 to 8 seconds the ADC should turn on the defrost heater (with the bimetal close). If the unit fails to go into the defrost mode during this test, the problem may not be with the ADC. A defective bimetal may be the cause of the failure. The ADC will only go into a test mode if the bimetal is closed. If the ADC senses an open bimetal it will return to the cooling mode within 3 to 8 seconds." In the defrost mode, you can test for 120 VAC at the pink wire to chassis ground or any white wire. in the cooling mode you can check the orange and/or red wire to chassis ground or a white wire, this will confirm voltage out to the components is proper and the ADC board is functioning properly.