The situation when you open the door of the refrigerator compartment, and it’s warm inside, can take any owner of household appliances by surprise. Products begin to deteriorate, and a panicky desire arises to immediately call a technician or buy a new unit. However, before taking radical measures, it is worth conducting a primary diagnosis, since often the problem lies in banal things that do not require complex intervention.
Modern models, be it Indesit, Bosch or LG, are designed on similar principles, and malfunctions of the cooling system have common symptoms. If you notice that the unit is humming, but does not create cold, or is working non-stop without any visible result, this is a signal for immediate action. Ignoring the problem at an early stage can lead to the failure of an expensive compressor.
In this article we will analyze in detail the mechanical and electrical reasons for the lack of cold, explain how to check the serviceability of the main components and determine in which cases repairs are possible with your own hands, and when you need to call a specialist. Remember that timely detection of a leak or sensor malfunction can save your food supplies and budget.
Primary diagnostics and external factors
Before disassembling the equipment or looking for spare parts, it is necessary to exclude external factors that affect the operation of the refrigerator. Users often forget about simple operating rules, which leads to false alarms. First of all, make sure that the unit is connected to the network and the power indicator on the panel is on. If there are no indicators, check the outlet and the integrity of the power cord.
The second important point is the location of the refrigerator. If it stands close to a wall or radiators, air circulation is disrupted. The radiator on the back wall must “breathe”, releasing heat into the room. The minimum distance from the back wall to the wall should be at least 5-7 cm for free heat removal. Violation of this rule leads to overheating and cooling stops.
It is also worth checking the thermostat settings. Someone in the household could have accidentally moved the wheel to minimum or turned on the "Vacation" mode. In models with electronic control (Electrolux, Samsung), an electronic failure may have occurred. Try disconnecting the device from the network for 15 minutes to reset the controller settings, and then turn it on again.
Problems with the compressor and start relay
The compressor is the heart of the refrigeration system. If it does not start, the refrigerant does not circulate through the pipes and no cold is produced. Listen carefully to the operation of the motor. If you hear a quiet hum that ends abruptly with a click and repeats cyclically, the problem most likely lies in starting relay or the motor itself.
The starting relay is responsible for starting the motor windings. Over time, the contacts inside it burn or oxidize, and the motor cannot start. Replacing a relay is an inexpensive procedure and can often be done yourself if you have the skills to work with electrical appliances. However, if the compressor is hot to the touch and makes a dull hum, there may be a winding failure, which requires replacement of the entire unit. turn-to-turn short circuit windings, which requires replacing the entire unit.
⚠️ Attention: If you smell a burning smell or see sparking in the compressor area, immediately unplug the refrigerator. Operating a faulty electric motor can lead to a wiring fire.
In some cases, the compressor works, but does not create the required pressure. This may indicate loss of piston compression. This can only be checked using a pressure gauge by connecting it to the service fitting. If the discharge pressure is weak, even when the motor is running, the refrigerator will not freeze effectively.
How to check the start relay yourself?
Unplug the refrigerator. Remove the protective cover from the compressor. Carefully remove the start relay (black plastic block). Shake it near your ear: if you hear a knock on the internals, it means the part is damaged and requires replacement.
Refrigerant (freon) leak and symptoms
One of the most common reasons why the refrigerator stops freezing is a leak refrigerant (freon). Without a sufficient amount of gas in the system, heat exchange is impossible. Leaks can occur in places where tubes are soldered, through microcracks in the evaporator, or due to corrosion of metal-plastic capacitors hidden in the walls of the housing.
The main symptom of a leak is the operation of the compressor without stopping. The motor tries to compensate for the lack of cold and hums around the clock, but the temperature in the chambers remains high. In this case, the evaporator itself (the plate inside the freezer) may only be partially covered with frost or remain completely warm. Unlike normal operation, where the cold is distributed evenly, with a leak you will notice “warm spots.”
Fixing a leak is a complex process that requires professional equipment. The technician needs to:
- 🔍 Find the leak using a leak detector or by immersion in water (for removable units).
- 🔧 Solder the damaged area or replace the circuit (for example, foam a new evaporator).
- 💨 Vacuum the system to remove moisture and air.
- ❄️ Fill the system with the exact amount of freon indicated on the nameplate.
Attempts to simply “refuel” the refrigerator without eliminating the cause of the leak will only give a temporary effect. After a week or a month, the gas will come out again, and the compressor, running idle, may burn out due to overheating.
Faults in the system No Frost
Refrigerators with the system No Frost (No Frost) have a more complex device, including a fan, defrosting heating element, sensors and a timer. If a “coat” of ice builds up in the freezer compartment, and it’s warm in the refrigerator compartment, it means the defrost cycle is broken. Ice blocks the air channels, and cold air simply does not enter the upper chamber.
The first candidate for testing is Defrost heating element (heating element). It should turn on on a timer and melt the ice on the evaporator. If the heating element is burnt out, the ice does not melt, the fan cannot drive air through, and the system stops. You can check the integrity of the heating element with a multimeter in the continuity mode: if there is no resistance (break), the part must be replaced.
The defrost sensor also often fails, which “does not see” that the evaporator is frozen and does not give a command to turn on the heating. In models LG i Samsung a common problem is clogging of the drainage hole through which water should drain. If the tube is clogged with dirt or ice, water overflows and freezes below, blocking the operation of the entire system.
| Symptom | Probable cause | Check method |
|---|---|---|
| Ice only on the back wall | The heating element or timer is faulty | Ring the heating element with a multimeter |
| Water on the refrigerator floor | Drainage clogged | Blow out the tube with a blower |
| Noisy, but not cold | Frozen evaporator | Visual inspection after defrosting |
| Frost throughout the chamber | The door is not tightly closed | Checking the seal |
☑️ Diagnostics No Frost
Clogged capillary or filter drier
There is a bottleneck in the freon circulation system - the capillary tube. Its diameter is less than a millimeter, so it becomes clogged with oil oxidation products, paraffin or moisture. If the capillary is clogged, freon cannot circulate: pressure rises in the condenser (at the back), but there is none in the evaporator (inside).
Symptoms of a clogged capillary are similar to a leak: the compressor works, but there is no cold. However, there is a difference: the condenser (grid at the back) can be hot only at the beginning (at the compressor) and cold further, or completely hot, but without the characteristic freon hissing in the filter. The filter drier installed in front of the capillary may also become clogged and stop passing gas.
To eliminate this problem you need to:
- 🛠️ Cut off the old filter drier.
- 🔥 Purge the system with nitrogen under high pressure to clean it contamination.
- 🔌 Install a new filter and seal the system.
- 🌡️ Fill the refrigerator with freon.
This procedure cannot be performed at home without professional equipment. Independent attempts to clean the tube often lead to damage to it or depressurization of the system.
⚠️ Attention: When working with the cooling system, it is prohibited to use an open flame near gas cylinders and oil stains. Work should be carried out in a well-ventilated area.
Malfunction of the thermostat or electronic module
If the compressor does not turn on at all and is silent, although the indicators are on, the problem may be in the “brains” of the refrigerator. In mechanical models, this is responsible for thermostat a device that closes the circuit when the temperature rises. If its contacts have oxidized or the bellows has lost its seal, the command to start the engine will not be received.
In modern models with electronic control (Bosch, Whirlpool), the thermostat function is performed by temperature sensors and the main control module. If the sensor “lies” and shows the module that it is -20°C in the chamber, although it is +10°C, the compressor simply will not start. You can check the sensors by measuring their resistance at different temperatures.
Sometimes the electronic module itself fails. This can happen due to power surges or manufacturing defects. In this case, the refrigerator may behave chaotically: turn on and off spontaneously, blink indicators, or display error codes on the display. Repairing a module requires deep knowledge of electronics and is often replaced by installing a new board.
When you need to call a technician
There are a number of situations where independent repair is not only useless, but also dangerous. If you determine that the problem lies in a sealed circuit (leak, clogged capillary), or the compressor needs to be replaced, it is better to trust the professionals. The craftsmen have a license to work with freon, vacuum pumps and scales for precise filling.
It is also worth calling a specialist if you do not have the skills to work with a multimeter, soldering iron and electrical circuits. Inept intervention can turn a minor malfunction into a major breakdown. For example, incorrect soldering of the tubes will lead to repeated leakage, and incorrect installation of the heating element will lead to melting of the plastic case.
Do not forget that many manufacturers maintain a warranty only if service is carried out in authorized centers. Opening the seals or doing the repairs yourself often voids the warranty.
Why does the refrigerator freeze but does not turn off?
This is a classic sign of a freon leak or loss of compression. The unit tries to reach the set temperature, but due to a lack of refrigerant or low pressure, it cannot do this. The thermostat (or electronic sensor) constantly records the high temperature and does not give a command to turn off the compressor. Also, the reason may be the wear of the door seal, through which heat constantly flows.
Is it possible to use a refrigerator if it does not freeze?
For a short time - yes, if you store products there that do not require strong cooling, or use it as a cabinet. However, continuous operation in the “does not freeze” mode is dangerous for the compressor, which can overheat and burn out. In addition, bacteria multiply quickly in heat. If the problem is not solved within a day, it is better to move the products.
How long should defrosting take during diagnosis?
A minimum of 24 hours is required to completely defrost the No Frost system and evaporator. A shorter defrosting (for example, 2-3 hours) can melt visible ice, but will leave an ice plug in hidden channels or drainage, which will not solve the problem completely.
What to do if after defrosting the refrigerator started working, but after a week it stopped again?
This is an almost 100% guarantee of a malfunction of the automatic defrosting system. Most likely, the heating element, defrost sensor or timer burned out. At the moment of defrosting, you manually did their job, so the system came to life. But as soon as the operating cycle resumed, the faulty element again allowed ice to block the channels. The defective part needs to be replaced.