The situation when the refrigerator has stopped freezing in the upper compartment and in the lower chamber the products begin to deteriorate causes panic in any home cook. This is a classic symptom of poor refrigerant circulation or a malfunction in the temperature control system. Modern two-chamber models are designed in such a way that the cold is generated in one compartment (most often in the freezer) and is forced or naturally transferred to the refrigeration compartment. If this balance is disturbed, it is the upper chamber that suffers.
Before calling a technician, it is worth carrying out an initial diagnosis, since failure it may be trivial. Sometimes the problem lies not in the breakdown of units, but in improper operation or minor blockage. However, you can’t ignore the signal: if compressor works too hard, trying to compensate for the lack of cold, this can lead to expensive repairs.
In this article we will look at the main reasons why The refrigerator does not freeze well top, and determine which nodes require your attention. We will consider both simple cases that can be corrected on your own, as well as complex technical failures that require the intervention of a professional.
Problems with tightness and door seals
One of the most common reasons why the upper chamber does not cool products are not properly processed, resulting in a violation of the tightness of the circuit. The door may be warped, or the rubber seal may have dried out and lost its elasticity. In this case, warm air constantly enters inside, and the unit simply does not have time to cool it.
Check the condition rubber seal along the entire perimeter of the door. There should be no cracks, tears or sticky residue on it. If the seal is dirty, it should be washed carefully with warm water and soap. If the rubber is deformed, restore its shape using a hair dryer, heating the deformed area and pressing it against the body.
Also pay attention to the door hinges. Over time, they can weaken and the door warps. This creates a gap through which the cold escapes. Make sure that the door closes tightly and with a characteristic pop, without distortions.
☑️ Checking the door tightness
⚠️ Attention: If after cleaning the seal and adjusting the hinges the problem persists, the deformation of the rubber may be irreversible. In this case, it is necessary to replace the seal with a new one, since the old one will no longer provide the required tightness.
Malfunctions of the No Frost system: heating element and defrost timer
If your refrigerator is equipped with a system No Frostthen the lack of cold in the upper chamber when the freezer is running often indicates problems with the system defrost. In such models, cold air is forced by a fan from the freezer into the refrigerator through special channels. If these channels become clogged with ice (“coat”), air circulation stops.
An ice plug is formed when one of the elements of the defrost system fails: Evaporator heating element, defrost sensor or the timer. The heating element must heat up at certain intervals, melting the ice on the evaporator. If it burns out, ice accumulates and blocks the air ducts.
- ❄️ Defrost heating element is a heating element that can burn out over time.
- ⏱️ Defrost timer —a mechanical or electronic device that regulates freezing and defrosting cycles.
- 🌡️ Defrost sensor —a thermostat that turns off the heating element when a certain temperature is reached.
Diagnostics often require partial dismantling the back wall of the freezer. If you find a thick layer of ice on the evaporator that does not melt when the defrost mode is turned on, the problem lies precisely in the defrosting circuit.
How to check the heating element with a multimeter?
To check the heating element, you need to “ring” it with a multimeter in resistance measurement mode. If the device shows a break (infinity), it means that the heating element has burned out and requires replacement. Normal resistance is usually from 200 to 600 Ohms, depending on the model of the refrigerator.
Freon leakage: symptoms and consequences
Refrigerant leak (freon) is a serious technical malfunction that causes the refrigerator to stop freezing. Freon circulates in a closed circuit, taking heat from the chambers. If a microcrack appears in the system, the gas gradually evaporates, and the cooling efficiency drops.
Most often, a leak occurs in the foamed part of the case or in places where pipes are soldered. The first sign is that the freezer is working poorly or it does not freeze at all, and the upper chamber becomes warm. In this case, the compressor can work continuously, trying to gain temperature, and become very hot.
It is difficult to visually diagnose a leak if it is not accompanied by oil stains under the refrigerator. The technician uses a leak detector or nitrogen pressure testing method to find the location of the damage. After eliminating the leak, the system must be evacuated and filled with new freon.
| Symptom | Probable cause | Required action |
|---|---|---|
| The compressor hums, but does not freeze | Leak freon or blockage | Call a technician to find a leak |
| The refrigerator rarely turns on | The thermostat is faulty | Replacing the thermostat |
| Heavy ice in freezer | Problems with defrosting No Frost | Checking the heating element and timer |
| Heat only in the upper compartment | Clogged capillary tube | Purge the system or replacing the filter |
Clogged capillary tube and filter-drier
Another reason why the refrigerator does not freeze wellis clogged capillary tube or filter-drier. In the freon circulation system, oil oxidation products or moisture can accumulate, which turns into an ice plug in a narrow section of the tube.
When clogged, the pressure in the system is disrupted. The compressor is overloaded, trying to push the refrigerant, but the cold does not enter the evaporator in the required volume. This is often accompanied by an unusual sound of the motor or its periodic shutdown via a thermal relay.
To remove the blockage, the technician may try to pressurize the system or replace the filter drier. In difficult cases, a complete flushing of the circuit and replacement of the compressor oil is required, since the old one could be coked.
Faulty compressor and start relay
Compressor is the heart of the refrigerator. If it fails, the cold ceases to be produced completely. However, there are situations when the engine hums but does not start, or starts for a few seconds and stalls. This may indicate a breakdown of the starting relay or an interturn short circuit of the windings.
The starting relay is responsible for starting the compressor engine. If it burns out, the compressor cannot reach the required speed. You can check the relay by gently shaking it near your ear: if you hear the ringing of the parts inside, most likely the mechanism is destroyed.
If the compressor itself makes a dull hum and gets very hot, but does not start, this is a sign of a wedge in the piston group or a short circuit. In this case, it is necessary to replace the entire unit, since repairing the compressor at home is impossible and economically unfeasible.
⚠️ Attention: When replacing a compressor or start relay, it is important to strictly follow the soldering and vacuum technology of the system. The entry of moisture or air into the circuit is guaranteed to lead to rapid breakdown of the new compressor.
Failure of the thermostat or electronic module
In refrigerators with electromechanical control, thermostatis responsible for the temperature. This device measures the temperature in the chamber and commands the compressor to turn on or off. If the thermostat is “stuck” in the “off” position or does not read the readings correctly, the upper chamber will remain warm.
In models with electronic control (for example, LG, Samsung, Bosch), the thermostat function is performed by temperature sensors that transmit data to the main control module. The failure of one sensor or a failure in the firmware of the board can lead to the fact that the refrigerator “does not see” the temperature increase and does not turn on the cooling.
Diagnostics of the electronic module requires special knowledge and equipment. Often a malfunction is indicated by a flashing temperature indicator on the control panel or the appearance of an error code on the display. The decoding of the code can be found in the instructions for the specific model.
Frequently asked questions (FAQ)
Why is there ice in the freezer, but warm in the refrigerator?
This is a classic sign of a system malfunction. No Frost. Most likely, the air ducts through which cold air should flow from the freezer to the upper compartment are frozen. The reason lies in the breakdown of the defrost heating element, timer or sensor.
Is it possible to use a refrigerator if it does not freeze well?
Short-term operation is possible, but undesirable. If the cause is a freon leak, the compressor will work without stopping, which will lead to overheating and combustion. It is better to defrost the food and start repairing.
How long should the cold be restored after defrosting?
Usually, the refrigerator takes from 2 to 6 hours to reach operating temperature, depending on the volume of the chambers and the ambient temperature. If after 8-10 hours the upper chamber remains warm, there is a technical malfunction.
Why is the back wall of the refrigerator covered with ice?
A continuous layer of ice (“coat”) on the back wall indicates that the moisture does not have time to evaporate. This may be due to frequent opening of the door, storing liquids in open containers, or a malfunction of the defrost system.
What to do if the refrigerator makes gurgling sounds?
Gurgling and gurgling are normal sounds of refrigerant flowing through the pipes. However, if the sounds become loud, accompanied by a lack of cold, this may indicate airing of the system or a serious leak of freon.