The freezer is rock hard, the ice cream is fine, and the milk in the fridge is lukewarm. It is a confusing fault, because the fridge is clearly running. Something is stopping the cold air from getting from one side to the other.
A fridge not cooling but freezer working is almost always an airflow problem, a sensor problem or a control problem, not a dead compressor. That is good news, because many of the parts involved are small and affordable. This guide covers the common reasons, a sensible order to check them in, what to do if it started after a power outage, and when to stop and call a technician.
Short answer: in most fridge freezers, one cooling system sits in the freezer and a fan pushes some of that cold air into the fridge through a vent with a flap called a damper. If the vent is blocked, the damper is stuck, the fan has stopped or the sensor is giving bad readings, the freezer carries on freezing while the fridge slowly warms up.
Why the Freezer Keeps Working While the Fridge Warms Up
Most frost free fridge freezers have a single evaporator, the cold coil behind the freezer back panel. The freezer sits right next to it, so it gets cold first. The fridge gets its share through a duct, which carries cold air in when a temperature sensor says the fridge needs it.
That means the fridge depends on a longer chain of parts than the freezer does. Those include the evaporator fan, the air vents, the damper, the temperature sensor and the control board. If any link fails, the freezer is the last to notice.
Some older or smaller fridges work differently. Two door models with separate cooling systems, and fridges with a fan-less freezer, can fail in other ways. If your fridge has a separate evaporator for each compartment, the notes below still help, but the fault may sit in the sealed system.
Quick Checks Before You Pull Anything Apart
These take a few minutes and fix more fridges than you might expect.
• Temperature setting. Someone may have nudged the dial or touch panel. The fridge is normally set at around 3 to 4°C.
• Vents. Look inside the fridge for the cold air vents, usually near the back wall or top. If a tub of leftovers or a bag of veggies is pushed against one, cold air cannot get out.
• Overpacked shelves. A fridge stuffed to the door can block air even when the vents are clear.
• Door seals. Close each door on a strip of paper. If the paper slides out easily, the seal is not gripping.
• Door left slightly open. Check that the doors close all the way, and that nothing is stopping the crisper drawers from sliding in.
• Warm food. A big load of groceries or hot leftovers can warm the fridge for several hours without any fault at all.
If none of that helps, work through the causes below.
Fridge Not Cooling Reasons: 8 Common Causes
1. Blocked or Iced Up Air Vents
If you can see frost or ice around the vent, or on the divider between the compartments, the air path is clogged. Ice here often means the defrost system is not working. Read our guide to a freezer not defrosting with ice build up before you simply melt it, or it will return.
2. Stuck or Faulty Air Damper
The damper is a small flap, sometimes motorised, that opens and closes to let cold air into the fridge. If it sticks closed, the fridge gets almost no cold air at all. If it is frozen shut with ice, a manual defrost may free it.
Turn the fridge setting colder and listen near the vent. On many models you can hear or see the flap move. If it never opens, the damper or its motor is the likely fault. Damper parts vary a lot between models, so match the part number to your model before you order.
3. Evaporator Fan Not Running
The evaporator fan sits behind the freezer back panel and pushes cold air through the freezer and into the fridge. If it fails, the freezer still gets cold because it sits next to the coil, but the fridge gets very little airflow.
Open the freezer door and press the door switch in. You should hear and feel the fan running. A rattle, a squeal or a fan that does not turn may point to ice on the blades or a worn motor. Once any ice is cleared, a fan that is still stiff or silent needs replacing. Browse our fridge fan motors for a match.
4. Faulty Temperature Sensor
A thermistor tells the control board how warm the fridge is. If it fails, the board may think the fridge is already cold and never ask for more air. A sensor that reads too low is a classic reason for a fridge that stays warm while everything else looks normal.
Thermistors change resistance with temperature, so a single fixed value will not work for every model. You need the resistance chart for your fridge, then you compare the reading at a known temperature with that chart. A reading that is open, shorted or far from the chart means the sensor should be replaced. We stock a range of fridge temperature sensors.
5. Control Board or Thermostat Fault
On older fridges, a mechanical thermostat decides when the fridge needs cooling. On newer ones, an electronic board does. If the thermostat or board fails, it may stop calling for cold air in the fridge section.
This is harder to diagnose at home. Rule out the vents, damper, fan and sensor first. If those all check out and the fridge still does not cool, the control is the likely cause. Electronic boards are model specific, so confirm the part number before you buy.
6. Dirty Condenser Coils
The condenser coils release heat. When they are clogged with dust and pet hair, the fridge works harder and cools poorly. Usually this affects both compartments, but a fridge that is borderline can show it in the fridge section first.
Unplug the fridge and clean the coils with a vacuum and a soft brush. It takes a few minutes and is worth doing once a year anyway.
7. Worn Door Seal
A seal that is not gripping lets warm air in. The fridge section works hardest to keep up, so it is often the first to show it. Clean a grubby seal with warm soapy water. A torn or hardened gasket needs replacing.
H3: 8. Low Refrigerant
A refrigerant leak is less common, and it usually affects the freezer as well. It should only be suspected after everything above has been ruled out. If you think this is the problem, call a licensed technician.
Fridge Not Cooling After a Power Outage
Many people notice the fault right after a blackout, a storm or a tripped switch. That timing is not always a coincidence.
First, check the basics. Make sure the fridge is switched on at the wall, the power board has not tripped, and the display or lights are working. If the settings have been reset, set the temperature back to normal.
Give it time. After a power cut, the compressor often waits a few minutes before restarting to protect itself. Once running, a full fridge can take several hours to get back to its normal temperature. If the freezer is cold and the fridge is still warm after about a day, there is probably a real fault.
Possible faults after an outage.
• A power surge may have damaged the control board
• The start relay or overload that helps the compressor start may have failed
• A damper or sensor that was borderline may have finally given up
• Ice may have melted and refrozen, blocking a vent
If you hear a click and a hum every few minutes but the compressor never settles into a steady run, call a technician. This can point to a start relay or compressor problem.
What about the food? Temperature is what matters. As a general guide, food kept above 5°C for more than around four hours is considered risky, although it depends on the food. Perishables like raw meat, seafood, dairy and cooked leftovers carry the most risk. When in doubt, throw it out. Your state health department has detailed advice for power outages, and it is worth reading before you decide what to keep.
A Sensible Order for Checking
1. Check the temperature setting and make sure the doors close and seal properly.
2. Clear the vents and look at how the food is packed.
3. Look for frost around the vents and the back of the freezer.
4. Listen for the evaporator fan with the freezer door switch pressed in.
5. Check whether the damper opens when you turn the fridge colder.
6. Test the temperature sensor against the chart for your model.
7. Only then suspect the control board or thermostat.
8. Leave refrigerant and compressor problems to a licensed technician.
Can You Fix It Yourself?
Often, yes. Clearing vents, cleaning coils, replacing a seal or fan, and testing a sensor with a multimeter are all jobs that most people can handle with basic tools. Always unplug the fridge before you take a panel off, and do not work near mains wiring unless you are comfortable doing so.
Call a licensed technician if the compressor is not running, you suspect a refrigerant leak, the control board needs diagnosing or you are not comfortable working with 240V wiring. In Australia, work on refrigerant gas must be done by an ARC licensed technician.
Getting the Right Spare Part
The most common mistake is ordering a part that almost fits. Before you buy:
1. Find the model number on the sticker inside the fridge.
2. Note any number printed on the old part.
3. Take clear photos of the part and its connectors.
4. Use our Find Your Part page, or send us the model number and photos.
You can also browse our defrost timers and thermostats if the faults point towards the defrost system. We ship across Australia.
Keeping Your Fridge Cooling Properly
• Leave gaps around the vents so cold air can move
• Do not pack the fridge so tightly that air cannot circulate
• Let hot food cool before it goes in
• Clean the door seals every few months
• Vacuum the condenser coils once a year
• Do not keep the fridge too close to the wall
Frequently Asked Questions
Why is my fridge not cooling but the freezer is working?
Usually cold air is not reaching the fridge. The common reasons are blocked vents, a stuck damper, a faulty evaporator fan or a failed temperature sensor.
Why is my fridge not cooling properly after a power outage?
It may simply need a few hours to recover. If it is still warm after about a day, check for a tripped board, a reset setting, a failed relay or a damaged control board.
Is a fridge not cooling but the freezer is cold a compressor problem?
Rarely. If the freezer is cold, the compressor is probably running. The fault is more likely to be in the airflow or control parts that serve the fridge.
Can a dirty condenser stop the fridge cooling?
It can reduce cooling in both compartments, and a borderline fridge may show it in the fridge section first. Cleaning the coils is a cheap thing to try.
How long does a fridge take to cool down after a repair?
It depends on how full it is and how warm the room is, but several hours is normal.
Is it worth repairing a fridge that is not cooling?
Often it is. Damper, fan and sensor repairs usually cost far less than a new fridge, but it depends on the age and condition of the fridge.
Get Your Fridge Cooling Again
A fridge not cooling but freezer working looks alarming, but the fault is usually small. Work through the checks in order, test the parts that carry cold air to the fridge, and replace whatever has failed. If you are not sure which part you need, call Fast Fridgespares on 0405 972 558 with your model number, or use our Find Your Part page and we will help.