I have a refrigerator that is actuating its compressor for approximately 6-10 seconds, and then clicking off again. In testing the components, the start and run coils are testing within the proper resistance ranges, the run capacitor is showing proper capacitance, and the relay has been newly replaced (P#: AP5178110). Am I possibly needing to replace the mechanical defrost or thermostat? Thanks for your time and attention.
Answer Hi Ethan. You need to remove power from the unit. Ohm the compressor terminals for opens or shorts. There are 3-terminals on the compressor body. One is C (common), One is S (start), last one is R (run). You may need to use a magnifying glass to see them. Set the ohm meter to the smallest ohm setting. Rx1 or lowest range. Touch meter leads together to insure ohm meter is working correctly. It should show 0-ohms or . 1 ohms. Test between C and S terminals . Record readings, (4-6 ohms). Then between C and R. Record readings that are normally higher, (6-8 ohms). Then add the 2 recordings. (12-14 ohms). Now test between the S and R terminals. They should add up to the previous added separate recordings, + or - 10 % (12-14 ohms). Now test each terminal separately with one test lead on the comp. terminal and the other to chassis ground to see if the individual windings are not shorted. If it is shorted you will have a reading like (0 or higher) other then open. Usually you will have an electrical device ohm out correctly between windings, then you may find a short to ground. Thus- as the compressor starts up and after a few seconds it will draw excessive current and open the relay as you will audibly hear a solid click. Testing can be tricky, but this is the only way to know. The compressor is part # 12001872. Thank You.