Refrigerators

Refrigerator running constantly and not shutting off

A compressor that never seems to cycle off is often due to dirty coils, a door that isn't sealing, or a thermostat problem, and it wastes energy while stressing the compressor. Cleaning coils and checking the seal are the first steps.

Difficulty
Easy
Time
30–45 minutes
DIY cost
$0–$40
Pro cost
$150–$350

Symptoms

  • Compressor hum never stops or pauses
  • Fridge feels warm on the outside more than usual
  • Higher than normal electric bill
  • Fridge seems to cool fine but just never quiets down

Likely causes

  • CommonDirty condenser coilsCoils covered in dust can't release heat efficiently, forcing the compressor to run longer to compensate.
  • CommonDoor not sealing or left slightly openConstant warm air intrusion keeps the compressor working to maintain temperature.
  • PossibleFridge placed too close to a wall or heat sourcePoor clearance around the fridge limits heat dissipation, making the compressor run more.
  • PossibleFailing condenser fanIf the fan that cools the condenser coils isn't working well, the system compensates by running the compressor longer.
  • PossibleThermostat or temperature sensor malfunctionA faulty sensor can keep signaling the fridge to keep cooling even after reaching the right temperature.

What to do

  1. Clean the condenser coils thoroughly with a vacuum and coil brush.
  2. Check the door gaskets on both the fridge and freezer with the paper test for a tight seal.
  3. Make sure there's at least a couple inches of clearance around the back and sides of the fridge for airflow.
  4. Confirm the fridge isn't placed near a heat source like an oven, direct sunlight, or a heating vent.
  5. Listen for the condenser fan running when the compressor is on, checking for a weak or silent fan.
  6. Use an appliance thermometer to confirm the fridge is actually at a normal temperature despite running constantly, which can indicate it's just working hard rather than malfunctioning.
  7. If everything checks out but it still never cycles off, have a technician test the thermostat and sealed system.

Tools and parts

  • Vacuum with hose attachment
  • Coil brush
  • Appliance thermometer
Refrigerator condenser fan motorSearch: “refrigerator condenser fan motor”

When to call a pro

If coils are clean, the door seals well, and clearance is adequate but the compressor still never cycles off, a technician should test the thermostat and refrigerant charge.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.