You open the refrigerator door, expecting to feel the usual cold, but instead you feel warm, and the food begins to spoil. This is a classic situation faced by owners of household appliances of any brand, be it Indesit, LG or Atlant. Primary panic is understandable, but in the first minutes it is important not to make mistakes that could aggravate the situation or lead to financial losses.
Modern units are complex devices where many interconnected units are responsible for maintaining the temperature regime. Failure of even one element, for example thermostat or compressor, disrupts the entire cooling cycle. Understanding the principle of operation will help you quickly determine the nature of the malfunction.
In this article we will analyze in detail why the refrigerator works but does not cool, what symptoms indicate a freon leak, and when the problem lies in a banal defrosting. You will learn how to carry out primary diagnostics and whether it is worth calling a technician right away or you can try to fix the problem yourself.
Primary diagnostics: checking simple causes
Before sounding the alarm and looking for the service center number, you need to exclude external factors. Often, users look for complex technical problems, while the problem is solved in a couple of minutes. First of all, check whether the door fits tightly. If the seal is worn out or a foreign object gets into the gap, cold air will evaporate and warm air will flow inside the chamber.
Evaluate the location of the unit. If the refrigerator is located close to the wall or in a niche without gaps, heat exchange is disrupted. The compressor overheats and goes into protection mode, stopping pumping refrigerant. It is also worth checking the thermostat settings: perhaps someone in the household accidentally moved the lever or changed the parameters in the digital menu.
⚠️ Attention: If you notice that the motor-compressor is hot to the touch, but is silent, do not try to restart it immediately. Allow the equipment to cool for 2-3 hours, otherwise the electric motor may be permanently damaged.
It is important to listen to the operation of the device. Is the engine humming? Are clicks heard? No sound when the power is on may indicate electrical problems, while a continuous hum without cooling indicates a mechanical or freon failure. Fan in No Frost systems can also be a source of noise or lack thereof.
Problems with the defrosting system (No Frost)
In refrigerators with a No Frost system, the most common reason for stopping cooling is a malfunction of the defrost system. A “coat” of ice is growing on the evaporator, which is hidden behind a plastic panel inside the freezer. When the layer of ice becomes too thick, it blocks the channels for supplying cold air to the main chamber.
As a result, the freezer can still freeze somewhat, but the temperature in the refrigerator compartment is above zero. Visually, you may not see ice since the evaporator is closed. An indirect sign is swelling of the back wall in the freezer or the appearance of water under the vegetable drawers. Three key elements are responsible for the defrosting process: (defroster) and (or electronic module). If at least one of them fails, the defrost cycle will not start. Ice accumulates, the fan begins to make noise, touching the ice crust on the blades, and the cooling efficiency drops to zero.
Three key elements are responsible for the defrosting process: defrost heating element, defrost sensor (defroster) and timer (or electronic module). If at least one of them fails, the defrost cycle will not start. Ice accumulates, the fan begins to make noise, touching the ice crust on the blades, and the cooling efficiency drops to zero.
☑️ Diagnostics of the No Frost system
To eliminate This problem often requires complete defrosting of the unit within 24 hours. If after turning on the refrigerator worked normally, but after 1-2 weeks the situation repeated itself, it means that one of the elements of the defrosting system requires replacement. This is a typical “disease” of models Samsung and LG previous years of production.
Refrigerant leakage and leakage
One of the most serious problems is leakage freon. The refrigerant circulates in a closed circuit, and if a microcrack appears in the tubes or connections, the gas gradually evaporates. Without a sufficient amount of freon, heat exchange does not occur and cold is not generated.
Signs of a leak often appear gradually. At first, the refrigerator starts to work longer, the compressor almost does not turn off. Then, bald spots appear on the back grille (condenser) - areas that remain cold while the rest of the part is hot. Ultimately, the unit stops cooling completely.
| Symptom | Probable cause | Action |
|---|---|---|
| The compressor is hot, but silent | Motor jammed or leaking | Switch off, call a technician |
| The compressor tubes are the same temperature | Lack of freon in the system | Search for leaks and refill |
| Bloating of the wall inside the chamber | Evaporator corrosion (crying refrigerator) | Replacing the evaporator or installing a new one |
| Black deposits near the compressor | Burnt motor winding | Replacing the compressor |
It is impossible to eliminate the leak on your own. Special equipment is required to find the location of the damage, solder the pipes and evacuate the system before refilling. Attempts to simply “add gas” without eliminating the cause will lead to repeated breakdown in a short time.
Can I fill the refrigerator myself?
Self-filling with freon without evacuation of the system is strictly prohibited. Residual moisture in the tubes will turn into an ice plug that will block the capillary system, which will lead to expensive repairs of the compressor.
Faults of the compressor and start relay
The compressor is the heart of the refrigerator. If it does not work, the refrigerant does not circulate. However, the motor itself may be fine, but the problem may lie in start-protection relay. This small element provides the impulse to start the engine. If the relay is burned out, you can hear characteristic clicks every few minutes, but startup does not occur.
In more severe cases, the compressor itself fails. This may be an interturn short circuit of the windings or mechanical wear of the piston group. In this case, the unit either hums and does not start, or operates silently, without creating pressure in the system. Replacing a compressor is a complex and expensive process that requires a skilled technician.
Sometimes the problem lies in sticking contacts or oxidation of the wiring going to the motor. Testing the circuit with a multimeter helps determine whether voltage is reaching the consumer. If there is voltage, but the motor does not spin, the problem is inside the electric motor.
⚠️ Attention: When checking electrical circuits, be sure to unplug the refrigerator! Working with a voltage of 220V with wet hands or without insulating tools is life-threatening.
Clogged capillary tube
The capillary tube is a thin channel where throttling (sharp expansion) of freon occurs, which causes cooling. The diameter of this channel is very small, so it is sensitive to contamination. A blockage may form in the system due to oil oxidation products, moisture or debris introduced during poor-quality previous repairs.
When blocked, the compressor works with increased load, trying to push freon, but there is no circulation. A characteristic sign is that the condenser (grid at the back) remains cold or warm only at the beginning, and the freezer does not freeze. Often, gurgling or hissing is heard, which quickly stops.
Removing the blockage requires purging the system with nitrogen under high pressure and replacing the filter-drier. The filter retains moisture and dirt, and if it is clogged, its throughput decreases. Ignoring filter replacement during repairs is a serious mistake leading to re-clogging.
Failures in the operation of electronics and thermostat
In older models, a mechanical one is responsible for turning the compressor on and off. thermostat. This is a simple flask of gas that reacts to temperature. If the thermostat is stuck in the off position, the engine will not start. You can check it by closing the contacts directly (for diagnostics), but you cannot operate the refrigerator without a thermostat - it will freeze until it stops.
Modern models are controlled by an electronic module. The board receives signals from temperature sensors and commands actuators. If one of the sensors (for example, in the evaporator or in the chamber) produces incorrect data, the “brains” of the refrigerator may decide that the temperature is normal and not turn on the cooling.
It is also worth checking the integrity of the wiring. Vibration during compressor operation over time frays the wires, especially in the bends of the door or near the motor. An open circuit of the sensor or fan will lead to incorrect operation of the entire system.
Frequently asked questions (FAQ)
Why is the refrigerator humming, but not freezing, and what to do?
If you hear a hum, but there is no cold, the compressor may be working idle due to freon leak or blockage. The starter could also burn out. You need to listen: if the hum is intermittent and accompanied by clicks, change the relay. If the hum is constant, we call a technician to look for a leak.
Is it possible to use a refrigerator if it does not freeze?
You cannot store food in a unit that is not working - they will quickly spoil. In addition, if the cause is a faulty compressor or leak, further work may lead to complete failure of the unit and fire of the wiring.
How long should defrost last before checking?
To completely defrost the No Frost system and evaporator, you must keep the doors open for at least 24 hours. This is the only way to be sure that all the ice in hard-to-reach places has melted and evaporated.
Why is there ice in the freezer, but warm in the refrigerator?
This is a classic sign of a malfunction of the defrost system (heating element, sensor, timer) or a blockage in the air supply duct. Ice blocks the circulation of cold air from the freezer to the main one.