How to Test a Chest Freezer Compressor Relay

A chest freezer.
  • 1 hours
  • Beginner
  • 0-20
What You'll Need
Multitester
Needle nose pliers

Testing your freezer compressor is not difficult and can save you money on a repair visit. If you are up to the task, unplug your freezer and pull it out so that the back is exposed for you to work on.

Step 1 - Remove and Examine

The compressor relay is located at the lower bottom of the freezer, beneath the terminal cover. Pull it off of the compressor and use the needle-nose pliers to pull the connector that connects the wire on the side terminal of the relay.

Step 2 - Test the Relay

Set the multitester to X1 and place the relay upside down. Put the multitester probes into the S and the M terminals. It should read 0 ohms. Keeping the probes plugged in, turn the relay right side up. The magnetic switch should engage and the multitester should read infinity.

Repeat this step on the M and the S terminals individually. If the readings are the same, 0 upside down and infinity right side up, your compressor relay is fine. If this test fails at any point, your compressor relay is faulty and you must replace it with a new one.