Fridge Not Cooling? What to Check Before Calling Anyone
Simple checks for a fridge or fridge-freezer that is warm or not cooling properly, covering settings, seals, airflow and signs of a bigger fault.
A warm fridge puts food at risk, so it deserves quick attention. Many causes are simple: a setting nudged by accident, a door that does not seal, or a back vent blocked by stored boxes. Work through the easy checks first, and act on food safety while you do.
Protect your food first
If the fridge has warmed up, check the food. Move perishables to a coolbox or a neighbour's fridge, and be cautious with anything that has been warm for hours. General guidance is that chilled food should be kept cold, so when in doubt, throw it out. Keep the freezer closed, since a full freezer holds its temperature for a good while if undisturbed.
Easy checks
1. Is it getting power?
Check the light, the fan noise and the plug. Try another appliance in the same socket, and look at the consumer unit for a tripped switch. A fridge that was accidentally switched off or unplugged during cleaning is surprisingly common.
2. Temperature setting
Dials and digital controls can be knocked. A typical fridge compartment should be around 3 to 5 degrees Celsius, and a freezer around minus 18. After adjusting, give it several hours before judging.
3. Door seals
Close the door on a sheet of paper. If it pulls out easily, the seal may not be gripping. Look for splits, mould or a warped door. A dirty seal can often be cleaned with warm soapy water, and a worn one replaced.
4. Airflow and loading
- Do not block the air vents inside the cabinet with packed food.
- Leave a gap behind and above the fridge for ventilation.
- Avoid putting hot food straight in.
- Do not leave the door open for long periods.
5. Dust on the coils
Coils at the back or underneath dissipate heat. Dust and pet hair reduces efficiency. Unplug, then vacuum gently, using the manual to locate them.
6. Ice and frost
Excess frost in a frost-free model can block the evaporator and starve the fridge of cold air. If the freezer is heavily iced, see freezer ice build-up and defrosting.
Signs of a bigger fault
| Symptom | Possible cause |
|---|---|
| Compressor never starts | Start relay, thermostat or control board |
| Runs constantly, not cold | Refrigerant or compressor issue |
| Freezer cold, fridge warm | Fan, damper or defrost fault |
| Loud clicking or buzzing | Relay or fan problem |
| Water pooling | Blocked defrost drain |
Compressor and sealed-system problems must be handled by qualified engineers, and a sealed unit should never be opened by anyone else. Do not attempt to recharge or open the refrigeration circuit.
Deciding what to do
Describe the fault precisely, including what you have checked. Our fault description guide gives a template. Sealed system faults can be costly, so compare the quote with the cost of a new unit, using the repair or replace rule of thumb. Older fridges can also be inefficient to run.
If you decide to get help, you can describe the job on Compito and compare offers from ID-verified local providers.
Frequent causes summarised
- Setting changed or turned down.
- Door seal not closing.
- Blocked vents or overpacking.
- Dirty condenser coils.
- Ice build-up blocking airflow.
- A genuine component fault.
A worked example
A family notices the fridge is lukewarm but the freezer is solidly frozen. The fan in the freezer compartment can be heard running, yet the fridge side feels warm. Looking inside, the air vent between the two compartments is blocked by a bag of salad pushed against it. Moving it, then waiting a few hours, brings the fridge back to temperature. Had the vent been clear and the freezer heavily iced, the likelier suspect would be a defrost fault. The order matters: free checks first, parts later.
A fridge thermometer is worth a few pounds
Dials rarely show real temperature. A simple fridge thermometer placed on the middle shelf for a day gives you a number to compare with the 3 to 5 degree guideline, and a number is far more useful to an engineer than "feels warm". Note whether the reading changes after you adjust the setting.
Edge cases
- Integrated fridges rely on vents in the plinth and top of the housing. If a recent kitchen job covered them, cooling suffers.
- Garages and utility rooms: some models struggle in very cold or very hot rooms, so check the manual for the climate class.
- Rented homes: a supplied fridge that has failed is normally for the landlord to fix, so report it promptly and keep a note of the date.
- After a move: a fridge laid on its side or tipped may need to stand upright for a good few hours before switching on, per the manual.
When to call a professional
Do not open or tamper with the sealed cooling system, and do not try to recharge it. If the plug, socket or cable looks scorched or damaged, unplug it once it is safe to do so and have an electrician look at the socket. Otherwise an appliance engineer is the right call.
Frequently asked questions
How long can food stay in a warm fridge?
Chilled food is only safe for limited periods above recommended temperatures. Be cautious, and discard high-risk items if you are unsure how long it has been warm.
Why is my freezer fine but my fridge warm?
Cold air is usually shared between the two, so a blocked vent, a faulty fan or a damper problem can leave the fridge warm.
Should I turn it off and on again?
Switching off for 20 to 30 minutes and back on can help reset a control board, but give a fridge time to restart, as many protect the compressor with a delay.
Is a fridge worth repairing?
It depends on age and the cost of the part. Small faults such as seals, fans or thermostats are often worthwhile, while sealed system failures on old units may not be.
Is it safe to eat food from a fridge that went warm overnight?
It depends on how warm it got and for how long, and on the food type. Cooked meats, dairy and ready meals are higher risk. If you cannot be sure, official food safety guidance is to discard rather than risk illness.