A sudden loss of cold in the freezer is always stressful for the owner, because food supplies are at risk. When you open the door and instead of solid ice you see melting porridge inside, your first instinct is to panic or urgently look for the service center number. However, in a significant proportion of cases, the problem lies in trivial things that can be fixed on your own without calling a technician.
Modern refrigerators, be it Indesit, LG or Atlant, are complex units where a combination of a compressor, refrigerant and control system are responsible for cooling. Malfunction of any link in this chain leads to the fact that temperature ceases to drop to the required values. Understanding the physics of the process will help you quickly find the root of evil.
In this article we will analyze in detail the mechanical and electrical causes of malfunctions. We will not use complex terminology without explanation, but will focus on practical steps that will help revive your equipment.
Primary diagnosis: checking simple causes
Before grabbing the tools, it is necessary to exclude the human factor and external influences. It often happens that equipment is fully operational, but does not work correctly due to improper use. First of all, check whether you have pushed the refrigerator too tightly against the wall. The gap between the rear condenser grille and the wall must be at least 5-7 cm for normal air circulation.
The second critical point is how tightly the door is closed. If the rubber seal wears out, becomes dirty, or simply does not fit due to debris, the cold will evaporate faster than it is produced by the compressor. Do a simple test: press a piece of paper between the door and the frame around the perimeter. If the paper falls out on its own or is pulled out without resistance, the seal is broken.
⚠️ Attention: If you notice that the seal has become hard and inelastic, do not try to soften it with boiling water or aggressive chemicals. This will only speed up the destruction of the rubber. It is better to gently wipe it with warm water and mild soap and lubricate it with silicone lubricant intended for rubber products.
It is also worth paying attention to the location of the products. If you jam the freezer full, leaving a minimum of free space, the air circulation inside the chamber will be blocked. Cold air simply will not be able to reach all corners, and the sensors will show incorrect values.
Make sure that there is no thick layer of ice in the chamber. In models with manual defrosting, a layer of frost of more than 5 mm becomes a heat insulator that interferes with the cooling of products, and in No Frost systems, ice can block ventilation ducts.
Problems with tightness and thermoregulation
If simple measures do not help, we move on to more complex units. One of the common reasons that freezer compartment stopped freezing is the failure of the thermostat or temperature sensor. It is this element that “tells” the compressor when to turn on and when to turn off. If the sensor “lies” and reports that it is already -20°C inside, although it is 0°C there, the motor simply will not start.
In electronically controlled refrigerators thermistoris responsible for this. Its resistance changes depending on the temperature, and the control board reads these readings. The slightest deviation in the readings can cause the system to go into emergency mode or simply stop generating cold.
Checking the thermostat in mechanical models often requires testing it with a multimeter. To do this, you need to remove the regulator, immerse its sensitive tube in a container with water at a temperature of about 50 degrees (preheat) and check the contacts. If, when cooling, there is no click and no change in resistance readings, the part must be replaced.
It is important to note that in some models, for example, in old Stinol or Biryusa, thermostats may fail due to power surges in the network. Installing a voltage stabilizer can extend the life of new parts.
Faults of the compressor and start relay
The heart of the refrigerator is the compressor. If it does not start, hums, clicks and immediately stalls, or runs continuously without stopping, but there is no cold, this is where the problem lies. The compressor creates the pressure necessary to circulate the refrigerant through the system. Without this pressure freon remains static and does not cool the chamber.
Often the culprit for the “silence” of the motor is the starting relay. This is a small part that provides an impulse to start the motor windings. If the relay contacts are oxidized or the coil is burned out, the compressor will not be able to start. You may hear a characteristic click, followed by silence or hum.
⚠️ Attention: If you hear a loud click, followed by a hum, and then silence, and this repeats cyclically, immediately unplug the refrigerator! Operating in this mode (“humming without starting”) can burn out the compressor windings in a matter of hours, turning a simple repair into an expensive replacement of the unit.
Replacing the start relay is a procedure accessible even to a novice. You need to remove the back cover, disconnect the wires and replace the part with a similar one, selected according to the engine power. However, if replacing the relay did not help, the problem may be in the compressor itself (turn-to-turn short circuit) or in the control board, which does not send a signal to start.
Refrigerant leak and capillary system clogged
The most unpleasant technical malfunction is a freon leak. The refrigerant circulates in a closed circuit, and if a microcrack forms in the tubes or evaporator, the gas escapes. Without freon, heat exchange is impossible, and the refrigerator turns into an ordinary cabinet. Signs of a leak are often a swelling of the back wall inside the chamber or the appearance of rust on the external tubes.
Another common problem is Clogged capillary tube. Over time, oil oxidation products may form in the system or moisture may enter, which turns into an ice plug. This prevents normal refrigerant circulation. As a result, the compressor works, pressure is created, but the freon does not reach the evaporator.
How to find a freon leak yourself?
It is almost impossible to visually find a microcrack. Craftsmen use leak detectors that react to refrigerant vapors or the nitrogen pressure method. At home, you can only notice oily spots on the tubes, which indirectly indicates the place of depressurization, since the oil comes out along with the gas.
To eliminate these problems, specialized equipment is required: a vacuum pump, a pressure gauge station and a supply of freon. Fixing a leak and refilling the system on your own without experience is extremely difficult and risky. Incorrect refrigerant dosage will lead to incorrect operation or breakdown of the compressor.
It is worth noting that modern environmentally friendly refrigerants (for example, R600a) are explosive, which requires special care when carrying out work. If you are not confident in your abilities, it is better not to risk it.
Failures in the No Frost system
In refrigerators with the system No Frost ("No frost"), the reasons for the lack of cold may be specific. Here the air is cooled in a separate evaporator hidden behind a plastic panel and forced into the chamber by a fan. If one of the elements of this chain fails, the cold stops flowing to the products.
The first suspect is the fan. If it is jammed or the motor is burned out, cold air simply will not circulate. You can hear the compressor running, but there is no characteristic air flow noise coming from the freezer. Sometimes the fan blades become covered with ice and stop rotating.
The second important element is the defrosting system. It consists of a heating element (heater), a defrost timer and a defrost sensor. If the heating element burns out or the timer is stuck in cooling mode, the evaporator becomes overgrown with ice. Ice blocks the channels, and the fan blows air, but not cold, but room air.
☑️ Diagnostics of the No Frost system
Checking the defrost heating element is carried out by testing its spirals. If the resistance is infinitely high, the heater has burned out and requires replacement. You can try to switch the defrost timer to defrost mode manually (usually you need to turn the rod with a screwdriver until it clicks) and listen to see if the heating element starts.
Table of symptoms and probable causes
For ease of diagnosis, we have systematized the main symptoms of a malfunction in a table. This will help you quickly navigate the situation and understand which part will most likely need to be changed.
| Symptom | Probable cause | Difficulty of repair | Required tools |
|---|---|---|---|
| Compressor does not start, silence | Faulty start relay or thermostat | Low | Screwdriver, multimeter |
| Buzzes, clicks and turns off | The compressor is jammed or the relay is burned out | High (compressor replacement) | Set of keys, burner, freon |
| Works constantly, but does not freeze | Freon leak or system blockage | High (refueling required) | Pressure gauges, vacuum pump |
| Noisy, but no cold (No Frost) | Fan or defrost heating element is faulty | Medium | Hair dryer, multimeter, screwdriver |
| Ice only at the back wall | The door seal is broken | Low | Hair dryer (for seal adjustments) |
As can be seen from the table, many problems can be solved by replacing inexpensive parts. However, the diagnosis must be accurate. For example, replacing a thermostat with a real freon leak will not give any result, but will only waste your time.
Safety comes first, and even simple manipulations with electrical circuits require compliance with electrical safety rules.
When you need to call a specialist
Despite the desire to save money, there are situations when professional intervention is inevitable. If the diagnosis shows a freon leak, the system must be sealed, evacuated, and accurately charged with refrigerant. Without special equipment, it is impossible to perform these operations efficiently.
It is also worth contacting specialists if the compressor itself has failed. Replacing it requires soldering copper tubes, working with an open flame and accurately calculating the amount of oil and freon. An error in the amount of refrigerant can lead to water hammer and instant breakdown of the new motor.
⚠️ Attention: If your refrigerator is under warranty, any independent intervention (even simple replacement of a light bulb or seal, if it requires disassembly) may be grounds for refusal of warranty service. Open seals only if the warranty has already expired.
In addition, modern inverter compressors and complex electronic control modules require in-depth knowledge of electronics for diagnosis. An attempt to “re-solder” a board without a circuit diagram can finally finish off the equipment.
In conclusion, regular defrosting and cleaning the drainage holes will help extend the life of your refrigerator. Keep the condenser at the back of the unit clean - dust on the radiator fins impairs heat transfer and causes the compressor to work with overload.
Frequently asked questions (FAQ)
Why did the freezer stop freezing after defrosting?
If after defrosting the refrigerator does not turn on or does not freeze, moisture may have gotten into the electrical contacts or sensors. Allow the equipment to dry completely (at least 12-24 hours) before turning it on again. The thermostat could also have failed due to a sharp temperature change.
Is it possible to use a refrigerator if it has stopped freezing?
You cannot use such a refrigerator for storing food, since bacteria multiply quickly in a warm environment. It is possible to operate it in a switched-off state like a cabinet, but it is better to eliminate the cause of the malfunction in order to avoid mold and unpleasant odors inside the ventilation system.
How long does it take for a refrigerator to get cold after repair?
After replacing the freon, compressor or filter-drier, the refrigerator needs from 2 to 6 hours to reach operating temperature. At this time, it is not recommended to open the doors and load food. Complete stabilization of temperature conditions can take up to 24 hours.
Why is it warm in the freezer and cold in the refrigerator?
In two-compressor models, this indicates a problem in the freezer circuit (leakage, compressor failure). In single-compressor models (where there is one motor for both chambers), this often indicates a malfunction of the No Frost system, clogged channels or a problem with the air flow control damper.