Why Is My Refrigerator Constantly Running

Quick answer

If your refrigerator is constantly running, it may be due to a faulty thermostat, dirty condenser coils, or a failing compressor. Clean the coils, check the thermostat setting, and ensure the door seals tightly. If the issue persists, a professional inspection may be needed.

Confirm the symptom

• Refrigerator motor runs continuously without cycling off
• Interior temperature is warmer than normal
• Loud humming or running noise is constant
• Freezer compartment is not freezing properly
• Increased electricity bill without a clear reason

Tools and prep

• Screwdriver (flathead and Phillips)
• Vacuum with brush attachment
• Thermometer for temperature check
• Flashlight
• Work gloves
• Turn off refrigerator to avoid electrical hazards
• Unplug the unit before cleaning or inspecting components

Step-by-step troubleshooting

1. Check Thermostat Settings
   Do: Ensure the thermostat is set to the correct temperature (usually 37–40°F for fridge, 0°F for freezer).
   Observe: If the temperature is set too low, the fridge may run constantly.
   Means: Incorrect temperature settings can cause the compressor to work overtime.
   Next: Adjust the thermostat to the recommended temperature 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: If the paper slides out easily, the door seal may be damaged or dirty.
   Means: Poor door seals let cold air escape, making the fridge work harder.
   Next: Clean the seals with warm, soapy water and dry them. If they remain loose, consider replacing them.
3. Clean Condenser Coils
   Do: Locate the condenser coils (usually at the back or bottom of the fridge) and vacuum them thoroughly.
   Observe: Dust and debris on the coils reduce efficiency and cause the fridge to run constantly.
   Means: Dirty coils prevent proper heat dissipation, making the compressor work harder.
   Next: After cleaning, monitor the fridge for a few hours to see if it cycles off normally.
4. Check for Obstructions
   Do: Ensure the refrigerator is not placed too close to walls or other objects.
   Observe: If the fridge is too close, airflow around the coils is restricted.
   Means: Restricted airflow causes the coils to overheat, leading to constant running.
   Next: Move the fridge at least 2 inches away from walls and other surfaces to allow proper ventilation.
5. Test the Compressor
   Do: Listen for a humming sound and feel the compressor area for warmth.
   Observe: If the compressor is warm and humming constantly, it may be failing.
   Means: A failing compressor cannot cycle off, causing the fridge to run non-stop.
   Next: If the compressor is suspected to be faulty, contact a professional technician for further diagnosis.
6. Check for Overloading
   Do: Ensure the refrigerator is not overfilled with items.
   Observe: If the fridge is packed too full, airflow inside is restricted.
   Means: Restricted airflow prevents proper cooling, making the compressor work harder.
   Next: Remove excess items and organize the fridge to allow proper airflow.

Common causes

Parts matching

Common parts needed for a constantly running refrigerator include:

• Thermostat
• Door seal
• Condenser coils (cleaning only)
• Defrost timer
• Start relay
• Compressor (replacement requires professional service)
• Refrigerant (requires professional service)

Before purchasing parts, ensure the issue is correctly diagnosed to avoid unnecessary replacements.

When to call a professional

• The compressor is warm and running constantly without cycling off
• The fridge is making loud or unusual noises
• The temperature inside the fridge remains warm despite troubleshooting
• You suspect a refrigerant leak (smell or visible oil stains)
• The fridge is over 10 years old and requires major part replacement
• You are unsure about diagnosing or replacing internal components

FAQ

Related guides

• refrigerator temperature too high

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