How to Test a Refrigerator Compressor

Before testing and inspecting the refrigerator compressor, unplug the power supply from the wall source to avoid electrical shock incidents. To locate the compressor, look for a large cylindrical object at the back of your refrigerator. In most cases, it’s in the right side. You should be able to see wires coming out of the box.

Checking for Corrosion

Remove the terminal cover box and the overload protector and electric terminals will be exposed. Pull off the relay from the compressor itself. Using needle-nose pliers, pull the connector and be careful not to include the wires. Check the terminal and connector for corrosion. You should replace this as quickly as possible if there are any signs of corrosion.

Testing for Voltage Continuity

The multi-tester should be set to Ohms X1. Attach the tester’s probes to the compressor’s terminals. You should get a reading of zero Ohms. Then, attach the other probe to the other terminal. Do this in all three terminals and a perfectly-functioning compressor motor should give you a reading of zero Ohms in all three terminals. If you get a different reading, you will need to seek out professional assistance.

Testing for Ground

With the multi-tester setting at Ohms X1, allow one probe to touch the metal box housing and the other probe should touch the 3 terminals one at a time.