What Causes a Refrigerator to Constantly Run

Quick answer

A refrigerator that runs constantly is often due to a faulty thermostat, dirty condenser coils, or a failing compressor. Check the temperature settings, clean the coils, and ensure the door seals tightly to resolve the issue.

Confirm the symptom

• Refrigerator motor runs non-stop
• Interior temperature is not cooling properly
• Unusual humming or loud noises from the unit
• Higher than normal electricity bill

Tools and prep

• Screwdriver set
• Soft brush or vacuum with brush attachment
• Thermometer for temperature check
• Multimeter (for testing electrical components)
• Work gloves
• Turn off the refrigerator before cleaning or inspecting parts
• Unplug the unit before testing electrical components

Step-by-step troubleshooting

1. Check Temperature Settings
   Do: Verify the thermostat settings on both the refrigerator and freezer compartments.
   Observe: Settings should be at or below 40°F (4°C) for the fridge and 0°F (-18°C) for the freezer.
   Means: Incorrect settings can cause the compressor to run continuously.
   Next: Adjust the settings if necessary and wait 24 hours to see if the issue resolves.
2. Inspect Door Seals
   Do: Close the refrigerator door on a piece of paper and try to pull it out.
   Observe: A strong resistance indicates a good seal; if the paper slides out easily, the seal is faulty.
   Means: Poor door seals allow cold air to escape, making the compressor work harder.
   Next: Replace the door gasket if it is damaged or not sealing properly.
3. Clean Condenser Coils
   Do: Locate the condenser coils (usually at the back or bottom of the unit) and clean them with a brush or vacuum.
   Observe: Remove all dust and debris from the coils.
   Means: Dirty coils reduce cooling efficiency, causing the compressor to run longer.
   Next: Plug the refrigerator back in and monitor its performance over the next 24 hours.
4. Test the Thermostat
   Do: Use a multimeter to test the continuity of the thermostat.
   Observe: If there is no continuity or the reading is inconsistent, the thermostat is faulty.
   Means: A malfunctioning thermostat can send incorrect signals to the compressor.
   Next: Replace the thermostat if it is not functioning correctly.
5. Check the Compressor
   Do: Listen for the compressor to kick in and out. Use a multimeter to test the compressor's windings.
   Observe: If the compressor is running constantly without cycling off, or if there is no power reaching it, it may be failing.
   Means: A failing compressor cannot regulate temperature properly.
   Next: If the compressor is faulty, it may need to be replaced by a professional technician.
6. Inspect the Evaporator Fan
   Do: Check if the evaporator fan is spinning freely and making no unusual noises.
   Observe: If the fan is not spinning or is making loud noises, it may be obstructed or damaged.
   Means: A faulty evaporator fan can prevent proper air circulation inside the refrigerator.
   Next: Clean or replace the fan if necessary.

Common causes

Parts matching

If you need to replace parts, ensure they match your refrigerator's make and model. Check the user manual for specific part numbers and compatibility.

• Thermostat replacement kit
• Door gasket seal
• Condenser coil cleaning brush
• Evaporator fan motor
• Compressor (if professional repair is required)

Purchase OEM (Original Equipment Manufacturer) parts for the best compatibility and performance.

When to call a professional

• The refrigerator continues to run constantly after checking and fixing all possible causes.
• You detect a refrigerant leak (smell, frost buildup, or hissing sound).
• The compressor is making loud, unusual noises or vibrating excessively.
• The refrigerator is not cooling at all despite proper settings and maintenance.
• You are unsure about testing or replacing electrical components like the compressor or thermostat.

FAQ

Related guides

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