The situation when The refrigerator continues to hum, the light inside is on, but the food in the freezer begins to melt, causing panic. This is a classic symptom of a cooling cycle failure, which can be caused either by a simple failure in the control system or by serious mechanical failure. It is important not to give in to emotions and consistently check the condition of the equipment in order to understand the scale of the problem.
The first thing to do is to assess the nature of the compressor's operation. If the motor runs continuously without turning off, or, conversely, turns on for only a few seconds, this indicates different types of faults. Loss of refrigerant or failure of the thermostat requires fundamentally different approaches to repair. In some cases, the problem can be solved independently, without calling a specialist, but often professional intervention using specialized equipment is required.
In this article we will analyze in detail the main reasons why refrigerator stopped freezing food, and we will draw up an algorithm of actions for diagnosis. Understanding the physical processes occurring inside the unit will help you make the right decision on further actions.
Checking the operating mode and settings
Before looking for hidden defects, make sure that the equipment is not accidentally switched to defrost or storage mode. Modern models Indesit, Bosch and LG equipped with electronic control, where a failure in the settings can simulate a breakdown. Check if the "Holiday" or "Eco" function is activated, which causes the temperature in the freezer to rise to -9...-12°C, which is not enough for deep freezing.
Pay attention to the thermostat. If it is mechanical, try turning the knob smoothly towards maximum cold. Sometimes the contact inside the regulator becomes oxidized and a simple twist will restore the connection. In electronic models, resetting the settings to factory settings via the menu Settings → Reset can eliminate a software glitch.
⚠️ Attention: If after changing the settings within 2-3 hours the temperature does not begin to drop and the compressor is operating normally, the problem lies deeper than just a control failure.
It is also worth checking the density Freezer door fit. If the seal (cuff) is worn out or dirty, warm air constantly enters and the unit simply does not have time to cool the volume. This is a common reason why freezer does not hold the temperature.
Malfunctions of the defrost system (No Frost)
In refrigerators with the system No Frost most A common cause of lack of cold is a failure in the evaporator defrost system. If the heating element, defrost thermostat or timer (or electronic control module) fails, a coat of ice builds up on the evaporator. This ice blocks the circulation of cold air, and it stops flowing into the chamber, although the compressor continues to work.
You can diagnose this problem by listening to the operation of the fan. If you don't hear it, the blades may be hitting the ice. In this case, the unit must be completely defrosted within 24 hours. If after defrosting the refrigerator began to freeze, but after 1-2 weeks the problem recurred, it means that one of the elements of the defrosting system is faulty and requires replacement.
☑️ Diagnostics of the No Frost system
It is worth noting that in models with one compressor and two circuits (or one circuit and a valve), ice can block not only the fan, but also the air channels. The temperature difference between the top and bottom of the freezer will be significant.
Freon leakage and problems with the compressor
If the compressor runs “idle” - that is, it hums, but does not create the necessary pressure in the system, or turns on for a short time and clicks, There may be a refrigerant leak. Freon could escape through microcracks in sealed areas or through a damaged evaporator. In this case, refrigerant simply does not circulate through the tubes, and the cooling capacity drops to zero.
It is difficult to determine the leak visually, but you can touch the condenser grille at the back of the refrigerator. If it is cold or at room temperature while the engine is running, then there is no gas in the system. Normally, the grate should be warm or hot.
Is it possible to refuel the refrigerator yourself?
Independent refueling is impossible without special equipment (vacuum pump, pressure gauge station, scales). In addition, you need to know the type and exact amount of freon indicated on the nameplate. An attempt to refuel "by eye" will lead to failure of the compressor.
Another option is a breakdown of the compressor itself. The engine may hum, but the piston group will be worn out and there will be no compression. In this case, the unit must be replaced with a new one. This is an expensive repair that must be performed by a certified specialist.
Clogged capillary tube
Another technical reason why refrigerator stopped freezing is clogged capillary tube. This is a thin copper pipeline where the refrigerant is throttled. If there is moisture or oil breakdown products in the system, an ice or dirt plug forms in a narrow place.
The symptoms of a blockage are similar to a leak: the compressor works, but there is no cold. However, if you touch the filter drier (the cylindrical element in front of the capillary tube), it may be cold or even frosted while the rest of the system is warm. Sometimes, when clogged, the compressor may overheat.
Removing the clog requires purging the system with high pressure nitrogen and replacing the filter drier. This is a complex procedure that requires the qualifications of a specialist.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The compressor is hot, but does not start (clicks) | Faulty starting relay or windings | Low (relay replacement) |
| Rear grille is cold when the engine is running | Freon leakage | High (search for leaks, refilling) |
| Ice on the back wall, the fan does not make noise | Malfunction of the defrost system (No Frost) | Medium (replacement of the heating element/thermostat) |
| The freezer freezes poorly, the filter-drier is frosty | Clogged capillary tube | High (blowing the system) |
Problems with the thermostat and sensors
The thermostat (thermostat) is the “brain” that commands the compressor to turn on or off. If its contacts are stuck in the "off" position or the temperature sensor (in electronic models) shows incorrect data, the compressor may simply not receive a signal to start. As a result, it is warm in the chamber, although technically the refrigerator is working.
In mechanical models, you can check the thermostat by closing its contacts directly (after disconnecting the equipment from the network!). If after this manipulation and connection to the network the compressor starts, it means that the regulator is faulty and requires replacement. In modern Samsung or Whirlpool diagnosis is carried out through the service menu or with a multimeter by testing the sensors.
When you need to call a technician
Independent repair is possible only in case of simple malfunctions: replacing the thermostat, defrosting the No Frost system, cleaning the condenser. However, there are situations when the intervention of an unqualified user will only aggravate the situation.
If you find that it is necessary soldering copper tubes or refilling the system with freon, it is better to immediately contact the service. Working with refrigerants requires a license, and improper evacuation of the system will lead to rapid failure of the new compressor.
⚠️ Attention: Do not try to solder tubes yourself with a running refrigerator or without using nitrogen. Residual freon may ignite when heated, and moisture entering the system will cause instant blockage.
A technician is also needed if the problem is related to the electronic control module. Repairing boards requires knowledge of circuit design and a programmer. An attempt to “reflash” the module without experience can lead to a complete failure of the electronics.
FAQ: Frequently asked questions
Why does the freezer not freeze, but the refrigerator works fine?
In two-compressor models, this indicates a breakdown of the freezer circuit (leakage, compressor). In single-compressor systems, most often the problem is in the defrost system (No Frost), when ice blocks the air supply channels specifically to the freezer, or the solenoid valve that switches the refrigerant flows is faulty.
How long does it take to defrost the refrigerator to check?
To completely defrost the No Frost system and evaporator, a minimum of 24 is required hours. A shorter defrosting may not have time to melt the ice in hard-to-reach places in the air ducts, and the diagnosis will be incorrect.
Is it possible to operate a refrigerator if it does not freeze?
Short-term - yes, for diagnostics. But long-term operation during a malfunction (especially if there is a freon leak or a blockage) leads to overheating and combustion of the compressor, which makes repairs economically unfeasible.
What to do if, after defrosting, the refrigerator started working, but after a week it stopped again?
This is a sure sign of a malfunction of one of the components of the defrost system: the evaporator heating element, the sensor defrost or timer. Diagnostics with a multimeter and replacement of the burnt element are required.