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Signs of a Failing Fridge Compressor Relay & How to Fix It

AZpartsA
AZparts Team
Updated on March 28, 2025
3 min read

The compressor start relay is a small but essential component of a refrigerator. It helps start the compressor, which is responsible for cooling. When this relay fails, the compressor may not turn on, leading to temperature issues, spoiled food, and increased energy consumption.

Refrigerator

What Is a Compressor Start Relay?

The compressor start relay is an electrical switch that helps power the compressor when the fridge cycles on.

  • It sends a high-voltage current to the compressor to start the cooling cycle.
  • Once the compressor is running, the relay disengages.
  • If the relay fails, the compressor may not start, leading to inconsistent cooling and food spoilage.

Signs of a Bad Compressor Start Relay

1. Fridge Runs but Isn’t Cooling
If your refrigerator is on but not maintaining the correct temperature, the start relay might not be engaging the compressor. A properly functioning fridge should maintain 35-38°F (1-3°C) in the fresh food section and 0°F (-18°C) in the freezer.

2. Clicking Noise from the Back
A bad start relay often causes a clicking sound every few seconds as it repeatedly attempts to turn on the compressor.

3. Warm Fridge with Working Lights
If the interior lights are on but the fridge isn’t cooling, the compressor may not be running. Place your hand on the compressor:
  • If it’s silent and cool, the start relay might be faulty.
  • If it’s warm and making clicking sounds, the relay is struggling to engage.

4. Overheating Compressor
A compressor that is extremely hot may be trying to start but failing. If left unchecked, this can cause the compressor to burn out, leading to costly repairs.

5. Frequent Circuit Breaker Trips
A failing relay can draw excess electrical current, overloading your home’s circuit and causing power surges.

How to Test the Compressor Start Relay

Before replacing the relay, test it to confirm the issue.

Tools Needed:
  • Screwdriver (to access the relay)
  • Multimeter (to test continuity)
  • Needle-nose pliers (to remove the relay)

Step-by-Step Testing Guide:
  1. Unplug the Refrigerator – Always disconnect power before working on electrical components.
  2. Locate the Compressor & Start Relay – The compressor is the black cylindrical unit at the back of the fridge, with the start relay attached to its side.
  3. Remove the Relay – Use pliers or your fingers to pull it off. Some models may have a cover that needs unscrewing.
  4. Shake the Relay – If it rattles, internal components may be damaged, indicating failure.
  5. Test with a Multimeter - Set the multimeter to continuity mode | Touch the probes to the relay terminals | A reading of 0-1 ohm means the relay is working | If the reading is infinite or zero, the relay is faulty.

How to Replace a Faulty Start Relay

If the relay is defective, replacing it is a simple DIY fix.

Step-by-Step Replacement Guide:
  1. Buy a Compatible Start Relay – Get an OEM replacement based on your refrigerator’s model number.
  2. Unplug the Refrigerator – Safety first.
  3. Remove the Old Relay – Pull it off the compressor terminals using pliers.
  4. Install the New Relay – Attach it securely to the compressor.
  5. Plug the Fridge Back In – Turn it on and listen for the compressor to start.
  6. Monitor Cooling – Wait a few hours to ensure the fridge reaches the correct temperature.

Preventing Future Relay Failures

  • Clean the Condenser Coils – Dust buildup can cause overheating. Clean the coils every six months.
  • Avoid Overloading the Fridge – Overloading forces the compressor to work harder, shortening relay life.
  • Ensure Proper Ventilation – Leave at least two inches of space behind the fridge for airflow.
  • Use a Surge Protector – Power surges can fry electrical components, including the relay.

Final Thoughts

If your Frigidaire, Whirlpool, or Kenmore refrigerator isn’t cooling, a faulty start relay could be the cause. Look for clicking noises, a warm fridge with working lights, an overheating compressor, or frequent circuit breaker trips.

KenmoreRefrigeratorWhirlpoolAppliances

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