Refrigerator compressor clicks but won't start running

Symptoms

• Rhythmic clicking sound every few seconds from the back of the fridge
• Fridge feels warmer over time since the compressor never actually runs
• No humming sound following the click, unlike normal operation
• Clicking may stop temporarily then start again later

Likely causes

• CommonFailed start relayThis small component helps the compressor start; when it fails, the compressor attempts to start, clicks off, and tries again repeatedly.
• PossibleWeak or failed start capacitorSome compressors use a capacitor to assist starting, and a failed one can cause the same repeated clicking pattern.
• PossibleCompressor itself has failed or seizedIf the relay and capacitor are fine, the compressor motor itself may be unable to start due to internal failure.
• Less commonLow voltage or power supply issueInsufficient voltage reaching the fridge can prevent the compressor from starting properly.

What to do

1. Unplug the fridge and let it sit for about 10 minutes, then plug it back in to see if the clicking pattern changes.
2. Locate the start relay, usually a small black component near the compressor at the back of the fridge, often accessible without major disassembly.
3. If comfortable and the fridge is unplugged, the relay can sometimes be removed and gently shaken; an audible rattle can indicate internal failure, though this isn't a definitive test on its own.
4. Check that the outlet is providing full, stable voltage using another appliance as a rough test.
5. Avoid repeatedly unplugging and replugging the fridge in quick succession, since compressors need rest time between start attempts.
6. Given the specialized skills and parts needed, most people should have a technician test the relay, capacitor, and compressor directly rather than replacing parts speculatively.
7. If diagnosed as a bad start relay or capacitor, replacement is usually far cheaper than a new compressor and often resolves the issue completely.

Tools and parts

When to call a pro

A clicking compressor that won't start is best diagnosed by an appliance technician who can safely test the start relay, capacitor, and compressor windings.

Safety