The situation when freezer compartment continues to work properly, but the main compartment of the refrigerator suddenly becomes warm, causes panic in any home cook. Products begin to deteriorate, condensation appears on the shelves, and equipment makes unusual sounds or, conversely, remains silent for too long. This is a classic symptom of a refrigerant circulation problem or a malfunction in the temperature control system.
In most cases, the problem lies not in the breakdown of the compressor, which continues to hum, but in the fact that the cold simply “does not reach” the upper or middle shelves. Modern No Frost systems and static models are designed in different ways, but the physics of the process is the same: if the evaporator is frozen or clogged, cold air stops flowing into the storage chamber. Understanding the structure of your unit will help you quickly find malfunction.
Before calling a technician, it is worth conducting an initial diagnosis. Often the reason is simple: a clogged drain hole or an incorrectly set operating mode. However, ignoring the problem can lead to failure of an expensive compressor. Let's look at the main reasons why the refrigerator does not freeze, although the freezer is functioning normally.
Violation of the rules of operation and placement of products
The first thing you need to check before you commit equipment breakdown is the loading density of the chambers. If you've recently returned from the store and your shelves are full, air circulation may have been compromised. In models with the system No Frost cold air is pumped by a fan through special channels. If these channels are blocked by food, the cold remains in the freezer, and the refrigerator compartment becomes warm.
Particular attention should be paid to the location of products near the back wall. In static models, there is an evaporator there, and the tight fit of the products can cause local hypothermia and the formation of a “snow coat”, which will block the access of cold to the rest of the chamber. In systems with airflow, food should not block the ventilation openings.
⚠️ Attention: Never place hot or even warm pans inside a running refrigerator. A sharp jump in temperature causes the compressor to wear out, and the released steam instantly condenses on the walls, disrupting heat transfer.
Also check whether you accidentally closed the air supply damper. In some models Indesit or Atlant the temperature regulator is located inside the chamber, and carelessly composed jars could shift it to the “minimum” position. Make sure the door closes tightly and is not warped under the weight of the food.
If you notice that the problem occurs periodically, analyze what foods you store. Packages with a high moisture content that are placed close to the walls can contribute to the formation of an ice crust that will eventually block the channels. Regularly check the freedom of air flow.
Problems with the door seal and heat transfer
One of the most common reasons why it is warm in the refrigerator is a leak in the refrigerator door. While you are reading this text, warm, moist air is constantly flowing into the chamber through a loose rubber band. The cooling system does not have time to cool it, although the freezer, the door of which can be closed more tightly, works normally.
Check the condition sealing rubber. It should not have cracks, creases or sticky residue. Over time, the rubber loses its elasticity and ceases to fit tightly to the body. Also, the reason may be contamination or misalignment of the door itself, which often happens if heavy bottles of water or juices are stored on the shelves.
For diagnostics, use a simple method with a sheet of paper. Press the door around the perimeter of the sheet and try to pull it out. If the paper is pulled out without resistance, it means the seal is broken. Condensation will accumulate in places of poor fit, and puddles will appear on the shelves.
If the seal is simply dirty, just wash it with warm water and soap and wipe dry. If the rubber is deformed, soften it with a hairdryer and straighten it, but this is a temporary measure. In the long term, it will be necessary replacement of the sealto avoid constant operation of the compressor and spoilage of products.
Malfunctions of the thermostat and temperature sensors
The thermostat (thermostat) is the “brain” that commands the compressor to turn on or switch off. If this element fails, it may “think” that the chamber is already cold enough and not start cooling, although in fact it is warm there. In older models this is a mechanical button, in new ones it is an electronic sensor.
Signs of a thermostat malfunction are obvious: the compressor either does not turn on at all or works non-stop, trying to reach an unattainable temperature. In the case when the freezer is freezing, but the refrigerator is warm, the sensor that controls the upper chamber or the damper controlled by this sensor is often to blame.
In modern electronically controlled models (Samsung, LG, Bosch), air sensors are responsible for the temperature. If one of them is lying or the contact is lost, the system receives false data. The display may show the norm, but in fact the temperature will be higher than permissible.
⚠️ Attention: Replacing the thermostat yourself requires accurate diagnostics. Installing an unsuitable model may result in the refrigerator operating in an incorrect mode, freezing or defrosting food.
Checking the thermostat in mechanical models is possible by closing the contacts. If the compressor starts after the short circuit, then the problem is in the thermostat. However, electronic systems require a special tester and knowledge of electronics. If you are not confident in your abilities, it is better not to take risks.
Clogged capillary tube or freon leak
These are the most serious technical faults. If refrigerant (freon) leaks out of the system due to a microcrack in the circuit or corrosion, the pressure drops. The compressor hums, trying to pump gas, but the amount is not enough to create cold in all chambers. Often in such cases, the freezer still somehow maintains a minus temperature, but the refrigerator is already at a positive temperature.
Another option is a clogged capillary tube. There are very narrow areas in the freon circulation system. If moisture, oil or decay products get into them, a plug forms. The refrigerant cannot circulate through the full cycle, and cooling of the main chamber stops. This is often accompanied by overheating of the condenser (grid at the back) in one part and coldness in the other.
How to distinguish a leak from a blockage?
When there is a leak, the condenser often remains only partially cold or warm, and the compressor runs overheated. If clogged, the compressor may become very hot and switch off via a thermal relay, and the condenser will be unevenly hot. Only a technician with a pressure gauge can make an accurate diagnosis.
A symptom of a leak can also be swelling of the inner wall of the refrigerator (in the place of the foamed evaporator) or the appearance of rust on the body. If you notice oily spots under the refrigerator or on the pipes at the back, this is an almost guaranteed leak.
Repair in such cases is complex: it requires searching for the location of the damage, soldering, vacuuming the system and refilling with new freon. It is impossible to fix a leak or break through an ice plug in a capillary without equipment.
Failures in the No Frost and defrost system
In refrigerators with a system No Frost the fan is responsible for air circulation, and the defrost system is responsible for the lack of ice. If the fan located in the freezer compartment stops or is running weakly, cold air will not flow into the refrigerator compartment. You will hear silence where there should be wind noise.
The second common problem is the “overgrowing” of the evaporator with ice. This happens if the defrost timer or defrost sensor is faulty. Ice builds up on the evaporator in the freezer and blocks the channels through which cold air should go up into the refrigerator. Visually, the ice in the chamber may not be visible, since it is hidden behind a plastic panel. Defrosting heating element, defrost timer or defrost sensor. Ice builds up on the evaporator in the freezer and blocks the channels through which cold air should go up into the refrigerator. Visually, the ice in the chamber may not be visible, since it is hidden behind a plastic panel.
This can be diagnosed by completely defrosting the refrigerator (for 24 hours with the doors open). If after defrosting the equipment worked normally, but after a week or two the problem returned, it means the defrosting system is faulty. The ice will block the channels again.
☑️ Symptoms of a defrost system malfunction
Replacing the heating element or defrost sensor is a standard procedure, but requires disassembling the rear wall of the freezer. It is also important to check whether the fuse, which often comes in conjunction with the heating element, has blown.
Diagnostics of the compressor and start relay
The compressor is the heart of the refrigerator. If it does not work at full capacity, the pressure in the system drops. It often happens that one of the windings burns out or the valves inside the motor wear out. In this case, the compressor hums, but does not create the necessary pressure to pump freon through both chambers. The freezer, being closer to the compressor outlet, still freezes, but the cold does not reach the refrigerator.
Another culprit is the start relay. This is a small part that fits onto the compressor contact. If it is faulty, the compressor may hum, click and turn off after a few seconds without properly starting. Or it can start, but work unstably.
You can check the operation of the compressor by touch (it should be warm, but not hot) and by sound. A uniform hum is a good sign. Knocking, clanging, or intermittent operation indicates a mechanical problem. It is also worth checking the voltage in the network: with strong power surges, the equipment may behave inappropriately.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The compressor hums, but does not start | Faulty start relay or compressor wedge | Medium / High |
| The refrigerator turns on, but does not freeze | Freon leak or capillary blockage | High (a technician is needed) |
| The chamber is warm, there is no ice on the walls | The thermostat or sensor is faulty | Medium |
| The freezer is covered in snow, the refrigerator is warm | System failure defrost (No Frost) | Average |
Frequently asked questions (FAQ)
Is it possible to continue to operate the refrigerator if it does not freeze, but works?
It is strictly not recommended. Food in the refrigerator will quickly deteriorate, which can lead to poisoning. In addition, if the cause is a freon leak or problems with the compressor, further work “to wear out” will completely wear out the motor, and repairs will become economically unfeasible.
How long does it take to defrost the refrigerator to check?
For complete defrosting, especially if there is a suspicion of an ice plug in the No Frost channels, the refrigerator should be left turned off with doors open for at least 24 hours. A shorter defrosting may not melt the ice in the hidden channels.
Why did the refrigerator start working after defrosting, but then stopped again a week later?
This is a classic sign of a malfunction of the automatic defrosting system (heating element, sensor or timer). Ice accumulated again and blocked the channels. A failed element of the defrost system needs to be replaced.
Is it dangerous to change the freon in the refrigerator yourself?
Yes, it is dangerous and ineffective without equipment. Freon requires the system to be evacuated before refilling. If you simply add gas to a system with a leak, the effect will be temporary, and the mixture of oils and moisture will damage the compressor in a short time.