Refrigerator Running Constantly? 6 Causes and What to Check

By Mountain View Appliance Pros · October 24, 2026

Why does my refrigerator keep running?

A fridge runs nonstop when it cannot reach its set temperature or cannot get rid of heat. The usual causes are dirty condenser coils, a worn door gasket, a thermostat set too cold, a failing condenser or evaporator fan, frost on the evaporator from a defrost problem, or low refrigerant. Start with the coils and the door seal. They cause most cases and are easy to check.

Need it looked at soon? Our appliance repair Mountain View CA technicians work on every major fridge brand, including built-ins.

Keep in mind that many newer fridges have inverter compressors. They run longer at low speed by design, so long, quiet run times alone are not a problem if the food stays cold.

What are the 6 most common causes?

1. Dirty condenser coils

The coils release heat from inside the fridge. When dust and pet hair cover them, the compressor has to run longer. Coils are usually behind the kick plate at the bottom or on the back.

2. Worn or dirty door gasket

A torn or loose seal lets cold air out and warm air in. Close the door on a dollar bill. If it slides out easily, the gasket is not sealing there.

3. Temperature set too cold

Settings that are much colder than needed keep the compressor busy. Aim for about 37°F in the fridge and 0°F in the freezer.

4. Failing fan

The condenser fan cools the compressor. The evaporator fan moves cold air. If either one is slow or stopped, the fridge runs longer and may warm up. A fan that buzzes or chirps is often on its way out.

5. Defrost problem

When the defrost heater, timer or sensor fails, frost builds on the evaporator and blocks airflow. You may see frost on the back wall of the freezer. Our guide to freezer frost buildup covers this in detail.

6. Low refrigerant or a weak compressor

A leak in the sealed system or a tired compressor means the fridge can never get cold enough. This needs a certified technician. Under EPA Section 608 rules, only certified techs may handle refrigerant.

What can you check yourself?

• Pull off the kick plate and vacuum the coils with a brush attachment.
• Do the dollar-bill test around the door seal.
• Check that the temperature settings are about 37°F and 0°F.
• Make sure there are a few inches of space behind and above the fridge.
• Don't block the air vents inside with food.
• Listen at the bottom for the condenser fan when the compressor runs.

Mountain View homes with fridges in a warm garage or a sunny kitchen corner see longer run times in summer. That is normal up to a point, but it also wears parts faster.

Is a fridge that runs all the time costing me money?

Yes. A refrigerator that never cycles off can use far more electricity than one that is working right, and the extra wear shortens the compressor's life. If your fridge is old, compare its energy use with a newer model on the ENERGY STAR refrigerator page before you pay for a major repair.

Our repair or replace guide helps you decide when a fix is worth it.

When should you call a technician?

Call if the fridge still runs nonstop after you clean the coils and check the seal, if the fridge or freezer is getting warm, if you see frost on the back wall, or if a fan is noisy or stopped. These point to a fan, defrost or sealed system problem. Most refrigerator repairs in Mountain View run about $200 to $600 with parts and labor.

See our refrigerator repair Mountain View page for brands and common fixes. If the fridge is warm, read refrigerator not cooling. If it is loud, read refrigerator making noise. Keep food safe with the FoodSafety.gov cold storage chart.

Other common repairs we see in Mountain View

If another appliance is acting up too, these guides can help: oven not heating up all the way, fridge water and ice dispenser not working, and washing machine repair for washers that leak, stall or will not spin.

Frequently asked questions