Refrigerator Runs Constantly: Common Causes and How to Fix It
If your refrigerator runs constantly or rarely shuts off, the problem could be caused by dirty condenser coils, poor airflow, a faulty thermostat, or a cooling system component that isn't operating efficiently. Before replacing any parts, inspect the most common causes listed below.
Possible Causes
- Dirty condenser coils
- Damaged or worn door gasket
- Faulty temperature control thermostat
- Defective evaporator fan motor
- Frost buildup on the evaporator coils
- Failed condenser fan motor
- Warm room temperature or frequent door openings
- Defective main control board
1. Dirty Condenser Coils
Most Common Solution
Dirty condenser coils prevent the refrigerator from releasing heat efficiently, causing the compressor to run longer in an attempt to maintain the correct temperature.
What to do:
- Unplug the refrigerator.
- Locate the condenser coils.
- Clean the coils using a vacuum or condenser coil brush.
- Restore power and monitor the refrigerator over the next several hours.
2. Damaged or Worn Door Gasket
A damaged door gasket allows warm air to enter the refrigerator, forcing the cooling system to run continuously.
What to do:
- Inspect the door gasket for cracks, tears, or gaps.
- Clean the gasket to remove dirt and debris.
- Ensure the door closes and seals properly.
- Replace the gasket if it is damaged.
3. Temperature Control Thermostat
A faulty thermostat may not properly regulate the refrigerator's cooling cycle, causing it to run longer than necessary.
What to do:
- Rotate the thermostat through its temperature settings.
- Listen for a clicking sound.
- Test the thermostat for continuity using a multimeter.
- Replace it if it fails testing.
4. Evaporator Fan Motor
The evaporator fan circulates cold air throughout the refrigerator. If the fan is not operating efficiently, the refrigerator may run continuously while trying to reach the desired temperature.
What to do:
- Listen for the evaporator fan during operation.
- Inspect for ice buildup or obstructions.
- Test the motor for continuity.
- Replace the fan motor if it is defective.
5. Frost Buildup on the Evaporator Coils
A failed defrost system can cause frost to accumulate on the evaporator coils, restricting airflow and forcing the refrigerator to run constantly.
What to do:
- Remove the rear freezer panel.
- Inspect the evaporator coils for excessive frost.
- Test the defrost heater, defrost thermostat, and defrost control board if frost buildup is present.
6. Condenser Fan Motor
The condenser fan cools the compressor and condenser coils. If it fails, the compressor can overheat and run continuously.
What to do:
- Inspect the fan blade for debris.
- Verify the blade spins freely.
- Test the motor with a multimeter.
- Replace the motor if it is defective.
7. Warm Room Temperature or Frequent Door Openings
High ambient temperatures or frequently opening the refrigerator door can cause the appliance to run longer than normal.
What to do:
- Avoid leaving the doors open longer than necessary.
- Verify the refrigerator has adequate ventilation around it.
- Keep the appliance away from heat sources such as ovens or direct sunlight.
8. Main Control Board
The main control board regulates the refrigerator's cooling cycle. Although uncommon, a failed board can cause the compressor to run continuously.
What to do:
- Inspect the control board for visible damage.
- Rule out all other cooling components before replacing the board.
Need Help Finding the Correct Part?
If you need help identifying the correct replacement part, send us your complete refrigerator model number and a clear photo of the appliance identification label before placing your order. Our team will verify compatibility and help ensure you receive the correct replacement part the first time.