The situation when the main chamber of the refrigerator properly cools food, while in the freezer compartment the temperature rises to critical levels, is one of the most common and alarming for owners of household appliances. This behavior of the unit often takes you by surprise, as it seems illogical: the compressor is humming, the light inside is on, but the ice in the freezer is melting, and the meat begins to spoil. Understanding the physics of the process and the structure of the system No Frost or drip type helps not to panic and correctly assess the scale of the problem.
Most often, the root of all evil lies not in the breakdown of the compressor itself, but in a disruption of the refrigerant circulation or a failure in the defrost control system. Modern models Indesit, LG or Beko equipped with complex electronics that can block the start of the freezing cycle in the presence of certain sensor errors. At the same time, the good old “Atlantas” or “Biryusy” may suffer from a banal blockage of the capillary tube or a freon leak, which requires the intervention of a specialist.
In this article we will analyze in detail why a temperature imbalance occurs, how to carry out the initial diagnosis yourself and in which cases calling a specialist is inevitable. It is important not to ignore the first signs of a malfunction, since prolonged operation in the wrong mode can lead to failure of an expensive compressor.
Incorrect temperature settings and overload
Before looking for complex technical faults, it is necessary to eliminate the human factor and operating errors. In modern refrigerators with a Electronic Control system, a failure in the settings can occur accidentally, for example, if the control panel was touched during cleaning or by children. The user could inadvertently switch the operating mode to “Holiday” or “Eco”, in which the freezer is turned off or operates in minimum mode to save energy.
Another common reason is a simple overload of the compartment. If you just returned from the store and filled your freezer with warm food to capacity, the system simply cannot cope with heat shock. Air cannot circulate around the food, and the temperature sensor does not detect changes, which is why the compressor does not receive a signal to work harder. In such cases, Samsung or Bosch may temporarily stop freezing until the heat balance is equalized.
⚠️ Attention: Do not try to speed up the freezing process by setting the temperature control to the minimum values (maximum cold) immediately after loading the products. This will create an excessive load on the compressor and may lead to its overheating and subsequent shutdown of the protective relays.
It is also worth checking the tightness of the door. If the rubber seal is dirty or damaged, warm air constantly enters the chamber, which the cooling system does not have time to remove. This is especially true for the upper compartments in models with a lower freezer, where warm air accumulates naturally.
- 🌡️ Check the current readings on the display and compare them with those recommended in the instructions (usually -18°C for a freezer).
- 🚪 Inspect the rubber seal around the perimeter of the door for cracks and tears or stuck debris.
- 📦 Make sure that food does not block the ventilation holes inside the chamber.
- ❄️ Try defrosting the refrigerator completely (for 12-24 hours) to reset the electronics error.
Problems with the defrost system (for No Frost models)
If your refrigerator is equipped system No Frost, then the most likely reason for the lack of cold in the freezer when the main chamber is working is a malfunction of the defrost system. The operating principle of such units is that frost accumulating on the evaporator is periodically melted by a heating element (heating element). If this process is disrupted, the evaporator becomes overgrown with a “coat” of ice, which blocks the operation of the fan.
As a result, the ice plug blocks the cold air supply channels. In the main chamber, cold can still enter according to the residual principle or through cracks, but the air simply does not reach the freezer, which is often a lump of cold in such systems. The fan, trying to blow air through the ice shell, may hum or stop altogether.
The main culprits in this situation are a burnt Defrosting heating element, failed defrost sensor (defrost timer) or a faulty fuse. The electronic control module “thinks that the defrosting has been successful” and starts a cooling cycle, but the ice does not go away, but only grows further with each cycle.
How to understand that the problem is in the defrosting system?
If you hear that the fan in the freezer is humming, cracks or works intermittently, and a layer of ice or snow is visible on the back wall - this is a sure sign of a malfunction of the defrosting system. Another sign may be that after complete defrosting, the refrigerator begins to freeze like new, but after 1-2 weeks the problem returns.
Diagnostics often require “ringing” the elements with a multimeter for resistance. If the heating element is working, it should show a certain resistance (usually within 200-400 Ohms), and an open circuit will indicate the need to replace the part. Sensors often “lie”, showing the control module that the evaporator temperature is already high, although in fact there is ice.
Refrigerant leak or clogged capillary tube
More serious technical problems are associated with a violation of the tightness of the circuit or freon circulation. If a microcrack has formed in the system (often in the foamed part of the housing or in solder joints), the refrigerant gradually evaporates. With a partial leak, the freon pressure may be enough to cool one chamber (usually the main one), but the gaseous refrigerant simply does not reach the freezer, where a lower temperature is required, or does not have time to condense.
Similar symptoms are observed when clogged capillary tube. Oil circulates in the system, which over time can thicken or mix with compressor wear products, forming a plug at the narrowest point of the circuit. Freon cannot pass through the blockage, circulation stops, and the freezer stops working, remaining warm.
| Symptom | Probable cause | Characteristic sign |
|---|---|---|
| The freezer is warm, the main chamber cools weakly | Freon leak | The compressor runs constantly without stopping, the condenser is hot (grid at the back) |
| Complete lack of cold in both chambers | Complete leak or compressor failure | Silence or rare clicks, cold condenser |
| The freezer does not freeze, a gurgling sound is heard | Clogged capillary system | Uneven heating of the tubes, intermittent operation unit |
| Frost only at the entrance to the evaporator | Partial leakage | Bloating of the side walls (in some models) |
Diagnosis of these problems at home is limited to visual inspection and listening to the operation of the unit. If you notice that the compressor Electrolux or Whirlpool works without interruption, trying to gain temperature, but there is no result, most likely there is a leak. It is impossible to eliminate the leak or clean the capillary on your own: you need to evacuate the system, replace the filter-drier and fill with freon by scale.
⚠️ Attention: Do not try to pierce the tubes yourself or unsolder them to “check the pressure”. The release of freon into the atmosphere is harmful to the environment, and the ingress of moisture into the system during repairs without a vacuum sealer is guaranteed to damage the compressor in a short time.
Faults of the compressor and start relay
The compressor is the heart of the refrigerator, creating pressure for the movement of the refrigerant. However, a situation where the “heart” beats, but the blood (freon) does not circulate properly is also possible. Sometimes the compressor works, but does not develop the required compression (pressure). This may occur due to burnout of the valves inside the engine. In this case, the unit hums, the condenser may be warm, but there is no cooling or it is very weak, affecting only one zone.
The starting relay becomes a frequent problem. If the contacts in it are burnt or stuck, the compressor may not start at all or may start for a split second and immediately stall with a characteristic click. In some cases, the relay allows the engine to start, but it operates in abnormal mode, not providing sufficient power for freezing.
☑️ Primary diagnostics of the compressor
If one of the tubes is running when the compressor is running (discharge) becomes red-hot or becomes excessively hot, and the other (suction) remains warm instead of cold - this is a sign of a circulation problem. It is also worth paying attention to the noise level: knocking, clanging or a high-pitched whistle indicate mechanical wear of the components.
Failures in the operation of the electronic control module
In modern refrigerators, such as LG, Samsung or Boschfor cold distribution and mode control the electronic module responds. If its operation malfunctions (for example, due to a power surge or contact oxidation), it may not send a signal to open the damper that regulates the air flow into the freezer, or may not turn on the fan.
Often the module “freezes” and requires a reboot. Temperature sensors (thermostats) may also fail and transmit incorrect data to the board. For example, the sensor in the freezer may indicate that it is -20°C, although in fact it is +5°C. Receiving such data, the module simply does not turn on the cooling.
For diagnostics, you need to enter the service mode (the combination of buttons depends on the model) and look at the error codes. However, it is better to interpret them using service documentation. Sometimes simply disconnecting the device from the network for 15-20 minutes to reset the memory helps.
Mechanical damage and external factors
External factors cannot be ignored. If the refrigerator is placed close to the wall, air circulation around the condenser is disrupted, which reduces cooling efficiency. Also, the equipment does not like direct sunlight and proximity to heating devices.
Mechanical damage can be caused during transportation. If the refrigerator was transported lying down without observing the time intervals for settling before switching on, oil could enter the circuit, resulting in water hammer or blockage. In addition, children or pets could accidentally move the temperature control or damage the wiring of the sensors.
⚠️ Attention: If you transported the refrigerator lying down, be sure to let it stand upright for at least 4-6 hours (or better yet, a day) before turning it on. This is necessary so that the oil flows back into the compressor crankcase.
Frequently asked questions (FAQ)
Is it possible to continue to use the refrigerator if the freezer does not freeze?
Short-term use of the main chamber is possible if the temperature is maintained there. However, food from the freezer needs to be moved urgently. Long-term operation in this mode is dangerous for the compressor, which will work to wear out, trying to reach an inaccessible temperature.
Why did the freezer start working after defrosting, but after a week it stopped again?
This is a classic sign of a malfunction of the defrost system (No Frost). Defrosting removes the ice plug temporarily, but since the heating element, timer or sensor does not work, the ice builds up again in a few days, blocking the air channel.
How much does the repair cost if you need to replace freon?
The cost depends on the model and type of refrigerant. Refilling with freon is a labor-intensive process that includes leak detection, soldering, evacuation and refilling. This is one of the most expensive types of repairs, often amounting to up to 50% of the cost of a new budget refrigerator.
How to check whether the defrosting heating element is working without disassembling?
It is impossible to accurately check the rear panel of the freezer without disassembling it. An indirect sign - if after complete manual defrosting (24 hours) the refrigerator begins to freeze perfectly, and after 5-7 days the problem returns, then with a 90% probability one of the elements of the defrosting system is faulty.