Fridge Not Cooling? Here's What to Check First

A fridge that stops cooling is one of those faults that quickly turns urgent. Food spoils fast, and it is not always obvious whether the problem is something simple you can sort yourself or a fault that needs a trained engineer. The good news is that a few safe checks from the outside can help you narrow it down before you pick up the phone.

This guide covers the most likely reasons a fridge or fridge freezer stops keeping temperature, what you can safely inspect without opening the casing or touching anything internal, and the signs that mean it is time to stop guessing and get a repair booked.

Why a Fridge Stops Cooling: The Main Possibilities

There is no single cause. A fridge not cooling properly could be anything from a blocked condenser coil to a failed thermostat, a faulty evaporator fan, a seized compressor, or a refrigerant leak in the sealed system. Each of these has a different fix and a different cost implication, which is why a proper diagnosis matters before any parts are ordered.

• Condenser coils coated in dustThe coils at the back or underneath the fridge release heat. If they are heavily clogged, the fridge works harder and eventually cannot maintain temperature. This is one of the few things you can address yourself from the outside.
• Evaporator fan not runningThe fan circulates cold air around the cabinet. If it stops, one section of the fridge may stay cold while another does not. You might hear an unusual silence where there used to be a gentle hum.
• Thermostat or thermistor faultIf the control that reads or regulates temperature fails, the fridge may not trigger the cooling cycle correctly. It can appear to run normally but never get cold enough.
• Door seal failureA damaged or warped seal lets warm air into the cabinet continuously, making it almost impossible for the fridge to hold temperature. Ice build-up around the seal is often a tell-tale sign.
• Frosted-over evaporatorIf the defrost system fails, ice builds up on the evaporator coils until airflow is blocked completely. The fridge runs but cannot circulate cold air. This is a very common cause of a fridge that stops cooling gradually over days or weeks.
• Compressor faultThe compressor is the heart of the cooling system. If it is failing, you may hear it clicking on and off repeatedly without the fridge getting cold. A failed compressor is a significant repair.
• Sealed system fault or refrigerant lossIf refrigerant escapes the sealed system, the fridge cannot cool at all. This requires specialist equipment to diagnose and repair, and is not a DIY fix under any circumstances.
• Start relay failureA small component that helps the compressor start. When it fails, the compressor cannot run. You may hear a click every few minutes as the fridge tries and fails to start the cooling cycle.

Safe Checks You Can Do at Home

Before calling anyone, there are a handful of checks you can do safely from the outside of the appliance. Switch the fridge off and unplug it at the wall before you touch anything, and if the appliance is plumbed in for a water dispenser, turn off the water supply too.

1. Check the power and settings. It sounds obvious, but confirm the appliance is actually switched on and that nobody has accidentally turned the thermostat dial to the off or minimum position. Check your fuse box too, in case a circuit has tripped.
2. Inspect the door seal. Run your fingers around the full perimeter of the door seal. Feel for gaps, tears, or sections that have gone stiff and no longer press flush against the cabinet. Close the door on a thin piece of paper: if it pulls out easily, the seal is not gripping as it should.
3. Look at the space around the fridge. Fridges need adequate clearance on the sides, top, and especially the back to disperse heat. If the fridge has been pushed tight against a wall or enclosed in a very warm space, that alone can reduce cooling performance.
4. Check for excessive frost or ice. Open the fridge and look at the back interior wall. A heavy sheet of ice suggests the defrost system has a fault. In a fridge freezer, check whether the freezer compartment is still freezing while the fridge section is not, or vice versa.
5. Listen for the compressor. With the fridge plugged back in and running, listen near the bottom rear of the appliance. A steady, quiet hum is normal. Repeated clicking, silence where there should be a hum, or a loud rattling are all worth reporting to an engineer.
6. Clean the condenser coils if accessible. On some fridge models, the condenser coils run along the back and are visible without removing any panels. If they are heavily coated in dust or pet hair, carefully vacuuming them with a brush attachment can help. Only do this with the appliance unplugged.

What You Should Not Attempt Yourself

There is a clear line between what a homeowner can safely inspect and what needs a qualified engineer. Do not remove any back panel, side cover, or internal casing. Do not attempt to defrost the evaporator with a heat gun or by interfering with the internal components. Never attempt to work on the sealed refrigeration system, handle refrigerant, or disturb any pipe or fitting inside the appliance.

Fridge vs Fridge Freezer: Does It Make a Difference?

In a standalone fridge, the cooling system serves one compartment. In a fridge freezer, a single sealed system typically serves both sections, meaning a fault in one part can affect the other in ways that are not immediately obvious.

For example, if the evaporator is frosted over in a fridge freezer, you might find the freezer still feels cold while the fridge section has warmed up. That is because the freezer sits closer to the evaporator and retains its temperature longer. By the time the fridge is noticeably warm, the fault may have been developing for some time.

Conversely, if the compressor is failing in a fridge freezer, neither section will hold temperature reliably. If you notice your freezer contents softening at the same time as the fridge warming up, that points toward a compressor, refrigerant, or control board issue rather than a simple door seal or fan fault.

We repair fridge freezers in Plymouth and across the wider Devon and Cornwall area, and the diagnostic approach is the same regardless of brand or configuration.

When to Call a Repair Engineer

If your safe checks have not identified an obvious cause, or if the fault is something you have identified but cannot safely fix yourself, it is time to get an engineer in. There are a few situations where you should not delay:

If the compressor is clicking repeatedly and not running, every failed start attempt puts additional stress on the motor. If the evaporator is heavily frosted, continuing to run the appliance will not resolve the fault and may make it worse. If you can see an oily residue near the pipework at the back, which can be a sign of a refrigerant leak, switch the appliance off and do not run it until an engineer has assessed it.

We also repair fridge freezers in Saltash and the surrounding areas.

Is Repair Worth It on an Older Fridge?

This is a genuine question and worth thinking through before you book. A fridge with a straightforward fault such as a failed door seal, a faulty thermostat, or a seized fan motor is almost always worth repairing if the appliance is otherwise in good condition. These are parts that are typically available and the labour is not excessive.

A compressor replacement on an older fridge is a bigger decision. The part and labour cost can be significant, and if the fridge is already ten or more years old, there is a reasonable chance another component will follow. An engineer can give you an honest view once they have diagnosed the fault. A good repair professional will tell you if they do not think a repair represents good value, not just quote for the work regardless.

For standalone freezer faults, the same logic applies: the age and condition of the appliance matters as much as the specific fault when you are weighing up repair against replacement.

Fridge Not Cooling: FAQ