If your fridge freezer seems to be running all the time, you may notice a constant humming sound, higher electricity bills, or the appliance feeling warm around the sides. While it is normal for a fridge freezer to run more frequently during hot weather or after being restocked, a unit that rarely switches off can indicate an underlying problem.

In many cases, the cause is something simple that can be identified and corrected. In others, a worn component may need replacing.

In this guide we explain the most common reasons a fridge freezer runs constantly and what you can do to fix the problem.

1. The Door Seal Is Damaged

A worn or damaged door seal is one of the most common causes of a fridge freezer running continuously.

If warm air enters the appliance through gaps in the seal, the cooling system must work harder to maintain the correct temperature.

Signs this is the problem

• The compressor runs frequently

• Condensation around the door

• Frost build-up near the seal

• The door does not close tightly

What to do

Inspect the seal for cracks, tears, or areas that have become flattened.

Replacing a damaged seal can often reduce running time and improve energy efficiency.

2. The Temperature Is Set Too Low

If the thermostat is set colder than necessary, the appliance will run longer in an attempt to reach the target temperature.

Recommended settings

• Fridge compartment: 3°C to 5°C

• Freezer compartment: approximately -18°C

Adjusting the temperature correctly can improve efficiency and reduce wear on components.

3. Dirty Condenser Coils

The condenser coils release heat from the refrigeration system.

Over time they can become coated in dust, pet hair, and dirt, making it harder for heat to escape.

Common symptoms

• The appliance feels warm externally

• The compressor runs continuously

• Increased energy consumption

How to fix it

• Unplug the appliance

• Locate the condenser coils

• Carefully remove dust using a brush or vacuum cleaner

Regular cleaning helps maintain efficient operation.

4. Frequent Door Opening

Every time the door is opened, warm air enters the appliance.

The fridge freezer must then work harder to remove the additional heat.

What to look for

• Increased running during busy periods

• Longer cooling cycles

• More frost build-up inside the freezer

Try to minimise how often the doors are opened and avoid leaving them open for extended periods.

5. The Appliance Is Overloaded

Packing a fridge freezer too tightly can restrict airflow.

When cold air cannot circulate properly, the appliance may struggle to maintain temperature and run continuously.

Helpful tips

• Leave gaps between food items

• Avoid blocking air vents

• Do not overfill shelves and drawers

Good airflow is essential for efficient cooling.

6. A Faulty Thermostat

The thermostat tells the cooling system when to switch on and off.

If the thermostat becomes faulty, it may continue calling for cooling even when the correct temperature has been reached.

Possible symptoms

• The appliance feels excessively cold

• The compressor rarely switches off

• Food begins freezing in the fridge compartment

A replacement thermostat may be required.

7. Excessive Frost Build-Up

Heavy frost inside the freezer compartment can reduce cooling efficiency and force the appliance to work harder.

Signs

• Thick ice on internal panels

• Reduced airflow

• Longer cooling cycles

If frost is building up inside the appliance, see Why Is My Fridge Freezer Icing Up? Causes and Fixes.

8. A Faulty Evaporator Fan

The evaporator fan circulates cold air throughout the appliance.

If the fan is not operating correctly, the cooling system may struggle to distribute air effectively.

Symptoms

• Uneven cooling

• Constant compressor operation

• Reduced airflow from vents

Replacing the fan motor may restore normal performance.

9. Hot Weather or Appliance Location

Environmental conditions can affect how often a fridge freezer runs.

Common causes

• The appliance is positioned next to an oven

• Direct sunlight is hitting the appliance

• The room temperature is unusually high

Moving the appliance or improving ventilation around it can help.

How This Relates to Other Fridge Problems

A fridge freezer that runs continuously is often linked to cooling and frost issues.

For example:

• If your appliance is struggling to maintain temperature, see Fridge Not Cooling Properly – Causes and Fixes

• If frost is building up inside the freezer, read Why Is My Fridge Freezer Icing Up? Causes and Fixes

• If water is appearing inside the appliance, see Fridge Freezer Leaking Water? Causes and How to Fix It

When Replacement Parts May Be Needed

If cleaning and adjustments do not solve the problem, some components may need replacing.

Common parts associated with continuous running include:

• door seals

• thermostats

• evaporator fans

• temperature sensors

Replacing worn or faulty parts can help restore normal cycling and improve efficiency.

You can find replacement fridge freezer spare parts for many appliance brands from Yourspares.

Preventing Excessive Running

Regular maintenance can help keep your appliance operating efficiently.

Helpful tips

• Clean condenser coils regularly

• Check door seals for wear

• Avoid overloading the appliance

• Keep vents clear

• Use recommended temperature settings

Final Thoughts

If your fridge freezer is running constantly, the cause is often related to airflow restrictions, worn seals, excessive frost, or thermostat problems.

By checking these common issues first, you can often improve efficiency, reduce energy consumption, and extend the life of your appliance.

If replacement parts are needed, fitting the correct component can help restore normal operation and keep your fridge freezer running efficiently.

Related Fridge & Freezer Advice

• Fridge Not Cooling Properly – Causes and Fixes

• Why Is My Fridge Freezer Icing Up? Causes and Fixes

• Fridge Freezer Not Freezing Properly? Causes and How to Fix It

• Fridge Freezer Leaking Water? Causes and How to Fix It

• Fridge Making Loud Noise? Causes and How to Fix It

• How to Replace a Fridge Door Seal

• How to Clean Fridge Condenser Coils