Situation, when refrigerator compartment stops cooling food, while the freezer continues to operate normally, is one of the most common complaints from owners of household appliances. Such a mismatch in temperature conditions can indicate a whole range of problems - from a banal blockage to serious compressor failure or loss of refrigerant. Users often panic when they see melting ice in the freezer or, conversely, too low a temperature where it should be warm.
Understanding the principles of operation of double-circuit or single-compressor cooling systems will help you quickly navigate the situation. In most modern models, the cold is distributed forcibly, and if this process is disrupted, it is the upper compartments that suffer. It is important not to ignore the first signs of malfunction, as this can lead to spoilage of a large number of products.
In this article we will analyze in detail why The refrigerator does not work, although the freezer is functioning properly, and what steps need to be taken to troubleshooting. We will consider both simple actions that are accessible to every user, and complex technical malfunctions that require the intervention of professionals.
The principles of operation of the No Frost and drip defrosting system
To understand the essence of the problem, you need to understand the structure of your unit. In systems No Frost the cold is produced in the evaporator, which is usually located behind the back wall of the freezer. Special fan pumps cold air from the freezer into the refrigerator compartment through special air ducts. If this mechanism fails, the cold simply does not reach the upper compartment.
In models with a drip system (Drop) everything works differently. Here the evaporator is located directly in the fridge compartment or behind its rear panel, and cooling occurs due to natural convection or the operation of a separate circuit. However, even in such models, air circulation plays an important role. If circulation is impaired, warm air accumulates in the upper part of the chamber.
⚠️ Warning: Attempting to forcefully open the back panel inside the refrigerator without turning off the power may result in electric shock or damage to the fragile evaporator tubes.
The key element in the cold distribution system is a thermostat or electronic temperature sensor. It is he who gives the command to the compressor to turn on or off. If the sensor that controls the fridge compartment fails and shows incorrect data, the compressor may simply not turn on, believing that the temperature inside has already reached normal.
Main causes of malfunction in No Frost models
The most common reason why the refrigerator does not cooland The freezer works, it is hidden in the evaporator defrost system. Ice builds up on the evaporator during operation. It should turn on periodically The defrosting heating element, which melts this ice. If the heating element burns out, the ice turns into a huge block that blocks the air duct channels.
As a result, the fan hums, trying to drive air out, but physically cannot push it through the ice plug. Cold air remains trapped in the freezer compartment, and only warm room air enters the refrigerator compartment. Over time, ice can block the fan itself.
Another possible reason is a malfunction of the fan itself. blowing fan. If its motor burns out or the impeller is jammed, forced circulation stops. In this case, it will be very cold in the freezer (since the evaporator is there), and in the refrigerator compartment the temperature will begin to rise.
- ❄️ Ice on the evaporator blocks the air dampers.
- 🌀 Failure of the fan motor blowing.
- 🌡️ Malfunction of the defrost sensor or heating element.
- 🚪 The door is not tightly closed, due to which the system does not have time to defrost.
Problems with the refrigerant and compressor
A more serious situation arises when there is freon leak. The refrigerant circulates through a system of tubes, first through the freezer, then through the refrigerator (or vice versa, depending on the circuit). If freon becomes scarce, it is only enough for the first section of the circuit - the freezer. The gas simply does not reach the refrigerator compartment in the required volume.
In this case, you may notice that the freezer is working for wear, the compressor is humming almost without interruption, trying to gain temperature, but there is no effect. Often, when there is a freon leak, the back wall inside the refrigerator remains warm or has only a small area of cold at the entrance of the tube.
Another option is Clogged capillary tube. Oil breakdown products or moisture can clog the narrow passage, preventing refrigerant flow. The symptoms are similar to a leak: the freezer is freezing, but the refrigerator is warm. In this case, the compressor may operate with overheating.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The compressor is silent | Malfunction of the thermostat or start relay | Low |
| The compressor hums, but does not cool | Freon leak or system blockage | High |
| The sound of the fan is heard, but there is no cold | Icing of the air ducts | Medium |
| The refrigerator operates cyclically | Problems with sensors or control board | Average |
Faults in electronics and sensors
Modern refrigerators such as as LG, Samsung or Bosch, are controlled by complex electronic modules. If control board receives incorrect signals from the sensors, it may not send a command to open the air damper or turn on the compressor for the refrigerator compartment.
Often fails temperature sensor in the refrigerator compartment itself. It may “stick” in a position indicating that the temperature has already reached +2°C, although in fact it is +15°C. The electronics “thinks” that everything is in order and does not turn on the cooling.
It is also worth paying attention to the air damper (damper). This is a mechanical or electromagnetic curtain that regulates the flow of cold air. If it is stuck in the closed position or the damper drive is burned out, the cold will not physically enter the upper compartment.
⚠️ Attention: Diagnostics of electronic boards requires special equipment. Without skills in working with a multimeter and knowledge of electrical circuits, it is dangerous to get into the “brains” of the refrigerator.
Sometimes the problem lies in the oxidation of the contacts. Under conditions of constant humidity and temperature changes, the sensor contacts may oxidize, which leads to signal loss. Visual inspection of connectors sometimes helps to identify obvious defects.
Self-diagnosis: step-by-step instructions
Before calling a technician, you can carry out an initial diagnosis. This will help you more accurately describe the problem to a specialist or, perhaps, resolve the issue yourself if the problem is simple icing. The first step is to completely defrost the refrigerator.
Unplug the appliance, remove all food and leave the doors open for at least 12, and preferably 24 hours. This is to ensure that the ice in the hidden ducts (that you can't see) completely melts. Often after such a procedure the refrigerator begins to work normally if the problem was in the system No Frost.
☑️ Primary diagnostic checklist
After defrosting, turn on the refrigerator and listen. You should hear the relay click, the compressor starts and after a while the fan starts (if model No Frost). Place your hand on the holes through which air enters the refrigerator compartment - a cold flow should come from there.
If, after complete defrosting, the situation repeats after 1-2 weeks, then the problem is deeper: the defrost heating element, timer or thermostat has burned out. In this case, you will need replacement of parts.
How to check the air damper?
If you have access to the damper (usually it is located at the top of the back wall of the refrigerator), you can try to gently move its lever with your hand (with the refrigerator turned off!). If it moves slowly or is jammed, it may need to be cleaned or the drive replaced.
When you need to call a technician and professional repairs
There are a number of symptoms in which self-repair is not only useless, but also harmful. If you suspect a freon leak, no amount of defrosting will help. It requires searching for a leak, soldering tubes, evacuating the system and charging with new refrigerant.
Replacement compressor is a complex operation that requires working with an open flame (burner) and special tools. The technician may also need to replace the filter-drier, which must be changed whenever the circuit is opened.
- 🛠️ Soldering of copper tubes and working with gas is required.
- 🔌 Replacement of the compressor or complex overhaul is required system.
- 💻 The electronic control module needs to be re-flashed or replaced.
- 🔍 A search for micro-leakage using special equipment is required.
In addition, if the refrigerator is under warranty, any independent repair will lead to loss of warranty. In this case, you must immediately contact an authorized service center.
Is it possible to operate the refrigerator if the refrigerator compartment does not work?
For a short time - yes, if the freezer is working properly. However, the compressor will work with increased load, trying to cool the entire volume, which can lead to overheating and failure. Long-term operation in this mode is not recommended.
Why did the refrigerator stop cooling again after a week after defrosting?
This is a classic sign of a malfunction of the defrosting system. Ice accumulated again and blocked the channels. Most likely, the defrost heating element, defrost sensor or timer has burned out. The faulty element needs to be replaced.
How long do you need to wait for the cold after defrosting?
After turning on the refrigerator, stabilizing the temperature in the refrigerator compartment usually takes from 2 to 5 hours. The freezer gets cold faster. If after 6-8 hours there is no cold compressor operation, there is a technical problem.
Does the amount of food in the refrigerator affect cooling?
Yes, an empty refrigerator takes longer to cool, since air is a poor cold accumulator. However, if food clogs the air ducts, it interferes with circulation. It is important not to overfill the chamber and not to close the openings for the release of cold air.