Review
Common Causes of Refrigerator Compressor Problems
AAZparts Team
Updated on May 13, 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.
The compressor start relay is a small yet vital component in any refrigerator. Its job is to help start the compressor, which powers the cooling system. When this relay fails, the compressor may not run, leading to a range of refrigerator compressor problems —such as rising temperatures, spoiled food, and higher energy bills.
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What Is a Compressor Start Relay?
The compressor start relay is an electrical switch that briefly sends high-voltage current to the compressor when the fridge cycles on. Once the compressor is running, the relay disengages.
If the relay is faulty:
- The compressor won’t start.
- The fridge can’t cool properly.
- You may notice several signs indicating the refrigerator compressor might be failing .
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
If your breaker trips frequently, a bad relay might be drawing excess current. This not only signals a refrigerator compressor problem , but it could also damage other components over time
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:
- Unplug the Refrigerator – Always disconnect power before repairs.
- Locate the Compressor & Relay – Found on the back, the compressor is a black cylinder with the relay attached to the side.
- Remove the Relay – Gently pull it off using your fingers or pliers.
- Shake Test – If it rattles, the relay may have loose or broken internal parts.
- Multimeter Test –
- Set to continuity or ohms.
- Touch the probes to the terminals.
- A good relay shows 0–1 ohm.
- No reading or infinite resistance means it’s faulty.
How to Replace a Faulty Start Relay
If your test confirms the relay is bad, replacement is a quick DIY fix.
Steps:
- Buy a Compatible Replacement – Use your refrigerator’s model number to find an OEM part.
- Unplug the Fridge
- Remove the Old Relay
- Install the New Start Relay – Attach it securely to the compressor.
- Plug the Fridge Back In – Listen for the compressor to kick on.
- Wait & Monitor Cooling – Give it a few hours to stabilize the 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, don’t panic. A bad compressor start relay is a common issue and often the root cause of refrigerator compressor problems . Look out for clicking sounds , warm fridge despite working lights , an overheating compressor , or frequent circuit trips . Testing and replacing the relay is straightforward—and could save your fridge from costly repairs.
The good news? Testing and replacing a faulty relay is simple—and much cheaper than replacing the entire compressor. At AZParts , you can find high-quality, OEM-compatible compressor start relays for a wide range of refrigerator models. A quick DIY fix today could save you from costly repairs tomorrow.
KenmoreRefrigeratorWhirlpoolAppliances
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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.
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