The situation when there is pleasant coolness in the main chamber of the refrigerator, and the food in the freezer compartment begins to melt, is a classic sign of a serious malfunction of the unit. Many users mistakenly believe that if the compressor is humming and the light in the chamber is on, then the equipment is working properly, but this is only a superficial observation. In fact, impaired refrigerant circulation or failure of one of the system components can lead to such paradoxical results when one zone functions normally, while the other completely fails.
The first thing that needs to be done when such an anomaly is detected is to carry out initial diagnostics without disassembly housings. It is important not to panic and consistently check the thermostat settings, as sometimes a failure in the electronics or an accidental turn of the knob could change the operating mode. It is also worth listening to the background sound: is the motor-compressor operating in normal mode or does it turn on too often and work without stopping.
If a visual inspection and checking the settings do not produce results, then the problem lies deeper, in the technical part of the device. In most cases, the culprits are clogging of the capillary tube or failure of the defrost system. Understanding the principle of operation of a double-circuit or single-circuit system will help you more accurately determine the source of the malfunction before calling a technician. freon leak, clogged capillary tube or failure of the defrost system. Understanding the operating principle of a dual-circuit or single-circuit system will help you more accurately determine the source of the malfunction before calling a technician.
⚠️ Attention: If you notice that oily spots have appeared on the back wall of the refrigerator or in the compressor area, under no circumstances try to start the unit again. This is a direct sign of depressurization of the circuit, and further operation of the compressor can lead to its complete combustion due to the lack of lubricant, which is carried away by freon.
The principle of operation of the No Frost and drip defrosting system
To understand why the temperature disproportion has arisen, you need to clearly understand how exactly the cold is distributed inside the chamber. In modern models equipped with the system No Frost, cooling occurs due to forced air circulation. A fan located in the freezer compartment (usually at the top or behind the back wall) forces air through the evaporator, where it is cooled, and directs flows into the refrigerator compartment.
If the fan stops, cold air stops flowing into the upper compartment, but in the freezer, where the evaporator itself is located, the temperature may remain for some time. However, in the case when the freezer does not freezeand the refrigerator is working, we often deal with the opposite effect or a specific breakdown of the circuit. In single-circuit systems, the cold goes from the freezer to the refrigerating compartment, and if it is warm there, then the cycle is interrupted.
In drip systems (“crying” evaporator), everything is different: here the evaporator is located on the back wall of the refrigerator compartment, and the freezer has its own separate circuit or is part of a common one. An imbalance of temperatures here often indicates problems with thermostat or gas leakage, since natural convection is disrupted.
Refrigerant leak as the main cause of the problem
One of the most common reasons why the refrigerator continues to hum, but stops freezing food, is a banal freon leak. The refrigerant circulates in a closed circuit, and if a microcrack forms in the tubes, the gas gradually evaporates. At the same time, the compressor runs idle, trying to pump up pressure that is physically insufficient to create the desired temperature gradient.
Leakage symptoms often appear gradually. At first, you may notice that the freezer began to freeze worse, then ice stopped forming altogether, and in the main chamber the temperature rose to room temperature. At the same time, the unit itself can work almost without interruption, trying to compensate for the lack of cold. This is an extremely harmful mode for motor-compressor, leading to its overheating.
It is almost impossible to determine a leak yourself without special equipment (leak detector), but there are indirect signs. If you move the refrigerator away and see swelling in the back wall or traces of rust at the joints of the tubes, the likelihood of depressurization is high. This is also indicated by the absence of a characteristic hissing sound when the device is disconnected from the network.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The compressor is hot, but there is no cold | Leakage freon | High (needs a technician) |
| Ice only at the entrance to the freezer | Clogged capillary tube | Medium |
| Fan does not spin | Fan motor malfunction | Low |
| Frost on the back wall | Problem with defrosting | Medium |
⚠️ Attention: Freon used in household refrigerators itself It is not toxic in itself in small quantities, but it is lighter than air and displaces oxygen. If you smell a strange chemical odor, ventilate the area immediately. Do not try to solder the tubes yourself without sampling the remaining gas.
Malfunctions of the defrost system (Defrost)
In units with the system No Frost a serviceable defrost cycle is critically important. The evaporator on which ice freezes must be periodically heated with special heating elements (heating elements). If this process is disrupted, the ice “coat” grows so much that it blocks the channels for air circulation.
As a result, the fan continues to work, but cold air simply cannot pass through the ice shell into the chambers. The freezer stops freezing, although the compressor is working as hard as it can. The main culprits in this situation are a burnt out defrost heating element, faulty thermal relay or defrost timer.
You can diagnose this problem by paying attention to the back wall in the freezer. If it is covered with an uneven layer of ice or, conversely, is completely dry while the compressor is running, this is a sign of a malfunction. Complete manual defrosting of the refrigerator within 24 hours often helps: if after turning on the problem disappears for a week or two and then returns, then the defrosting system requires replacing components.
How to check the defrosting heating element with a multimeter?
To check, you need to remove the back panel in the freezer, get to the heating element and “ring” its contacts. The resistance of a working heating element is usually from 200 to 500 Ohms. If the device shows a break (one on the screen), the element has burned out and requires replacement.
Clogged capillary tube
The capillary tube is the thinnest channel connecting the condenser and the evaporator, in which throttling (a sharp drop in pressure) of freon occurs. This is the bottleneck of the entire system, and it is here that blockages most often form. The reason may be moisture that entered the circuit during poor-quality repairs, or oil oxidation products inside the system.
If clogged, freon cannot circulate in full. The compressor tries to push the gas, creating excess pressure in front of the plug, but there is no cold further along the circuit. A characteristic sign is that the freezer may be cold only at the very beginning (at the entrance of the tube), and then the temperature rises sharply. In this case, the condenser (grid at the back) may only be partially hot.
Removing the blockage is a complex procedure and requires professional equipment. The technician needs to “push” the system with nitrogen under high pressure or replace the entire capillary tube. It is impossible to solve this problem on your own without a vacuum pump and a filling station.
☑️ Signs of a clogged capillary tube
Problems with the compressor and start relay
Although the compressor is the “heart” of the refrigerator, its breakdown does not always mean complete silence. Sometimes a faulty valve inside the compressor does not create enough pressure to circulate freon, although the motor itself hums. In this case, they say that the compressor “does not pump.”
The start-protection relay is also a common cause of unstable operation. If it “sticks” or does not work correctly, the compressor may start, run for several minutes, and then stall due to thermal protection, without having time to cool the chambers. You can check this by sound: a characteristic click and hum lasts 10-20 seconds, followed by a pause and a second click.
Replacing a compressor is a major overhaul that requires recharging the system. If your refrigerator is more than 10 years old, it is often more economically feasible to purchase new equipment, since the cost of replacing the “heart” can be up to 70% of the price of a new device.
⚠️ Attention: Be careful when checking the start relay. Even when switched off, there may be residual charge in the capacitors. Always disconnect the device from the power supply before removing the compressor casing.
Faults in electronics and sensors
Modern refrigerators are stuffed with electronics that control all processes. If the temperature sensor in the freezer fails, it can send a false signal to the control module that “it’s already too cold there.” As a result, the controller simply does not turn on the compressor or fans, although it seems to the user that the equipment is working (the light is on, the indication is on).
Failures in the control module (board) itself are also possible. Power surges in the network often damage tracks or microcircuits responsible for specific nodes. In this case, the refrigerator can behave chaotically: it freezes, turns off, or works in enhanced mode.
Diagnostics of electronics requires special knowledge and circuits. The average user can only visually inspect the board for burnt elements (blackening, swelling of capacitors) or try to reset errors by long-term disconnection from the network (for 15-20 minutes).
Operating rules for extending the life of equipment
To avoid situations where the refrigerator works, but does not freeze, it is important to follow basic operating rules. Regular defrosting (even for No Frost systems once every year or two) helps maintain heat transfer efficiency. Do not overload the chambers with food by blocking the ventilation holes - this interferes with air circulation and causes the compressor to wear out.
Keep the condenser grille at the back of the refrigerator clean. Dust and pet hair act as a heat insulator, preventing the freon from cooling, which leads to increased pressure in the system and reduced freezing efficiency. Wipe the door seals, as a loose fit leads to a constant flow of warm, moist air and rapid freezing of the evaporator.
Remember that timely maintenance and careful attention to the first signs of a malfunction (the appearance of excess noise, changes in operating mode) allow you to eliminate the problem at an early stage, avoiding expensive repairs or replacement of equipment.
Frequently asked questions (FAQ)
Is it possible to use the refrigerator if the freezer has stopped freezing?
For a short time - yes, the food is in the refrigerator compartment will not spoil immediately. However, long-term operation in this mode is dangerous for the compressor, which will work non-stop, trying to gain temperature. This may cause it to burn. It’s better to unload the food and call a technician.
How long should defrosting last when clogged with ice?
To completely melt the ice plug in hard-to-reach places in the evaporator, the refrigerator must be turned off with the doors open for at least 24 hours. One day is often not enough, since the ice inside the channels melts slowly.
Why, after defrosting, did the refrigerator stop freezing again after a week?
This is a sure sign of a malfunction of the defrosting system (the heating element, timer or sensor has burned out). The ice is growing again and blocking the channels. Diagnostics and replacement of a failed element of the No Frost system is required.
Could the thermostat be to blame if it does not freeze?
Yes, if the thermostat is “stuck” in the “off” position or shows incorrect values, the compressor will not turn on. But in this case, the refrigerator usually does not work either. If there is cold, but weak, the problem is most likely in a leak or compressor.
What to do if you hear gurgling, but there is no cold?
The sound of gurgling indicates that there is freon in the system and is moving, but perhaps there is not enough of it or the circulation is impaired (the filter drier is clogged). This requires the intervention of a specialist to find a leak or purge the system.