The situation when a refrigerator stops performing its main function always takes you by surprise. You open the door, and inside, instead of a pleasant cold, you feel stuffiness, the food begins to deteriorate, and the characteristic frost disappears on the walls or, conversely, a snow coat appears where it should not be. Malfunction cooling systems can be caused by a dozen different factors, from a banal violation of operating rules to a complex technical defect requiring the intervention of a technician.
Before you panic and look for a service center phone number, you need to conduct an initial diagnosis. Often the reason that refrigerator compartment or the freezer no longer maintains the desired temperature is simple things: a door that is not tightly closed, ventilation holes clogged with dust, or incorrect settings. However, if the equipment hums louder than usual or, conversely, is silent while the food is melting, the problem may be refrigerant leak or a compressor breakdown.
In this article we will look in detail at why The refrigerator does not freeze wellhow to independently identify the source of the problem and in what cases repair is possible with your own hands, and when you cannot do without calling a specialist. Understanding the principles of operation of the unit will help you save time and money, as well as extend the life of your equipment.
Primary diagnostics: external factors and settings
Before suspecting a serious breakdown, exclude the influence of external factors. Users often forget that temperature conditions the room directly affects the operation of the compressor. If the refrigerator is located close to the wall, near a radiator, or in direct sunlight, the heat dissipation system cannot cope. The air around the condenser (grids at the back) should circulate freely, carrying away excess heat.
It is also worth checking the thermostat settings. Perhaps one of the household members accidentally moved the handle or changed the parameters in the electronic menu. Older mechanically controlled models tend to wear out the bellows tube, resulting in incorrect readings. In modern models with the system No Frost the failure could have occurred due to a power surge.
⚠️ Attention: If you notice that the rubber seal on the door has lost elasticity or is torn, the cold will evaporate constantly. The compressor will work non-stop, trying to compensate for losses, which will lead to its overheating and failure.
Check the tightness of the door. A sheet of paper sandwiched between the door and the body must be removed with force. If it falls out freely, it means the seal is broken. This is one of the most common reasons why the refrigerator does not freeze properly, especially in the upper or lower sections, where warm air enters most actively.
Problems with the thermostat and temperature sensors
The thermostat is the “brain” that commands the compressor to turn on or off. If this element fails, the refrigerator may either run continuously, creating an ice block, or may not start at all, allowing food to defrost. In mechanical models, a sign of a malfunction is a click when turning the handle, but no response from the motor.
In modern electronically controlled models, they are responsible for temperature control sensors (thermistors). There may be several of them: one controls the air in the chamber, the other controls the temperature of the evaporator. If the sensor “lies” and transmits incorrect data to the control module (for example, that it is -20°C in the chamber, although there is +10°C), the compressor simply will not start.
Diagnostics of the thermostat at home is possible, but requires caution. For mechanical devices, the “freezing” method is often used: remove the regulator and place it in a cold environment. If the contacts do not click, the part is faulty. Electronic sensors are checked with a multimeter for changes in resistance when the temperature changes.
How to check a thermostat with a multimeter?
To check, you need to remove the terminals from the contacts of the thermostat. Set the multimeter to dialing mode. At room temperature the contacts should ring (be closed). If you put the regulator in the freezer for 15-20 minutes, the contacts should open (stop ringing). If this does not happen, the part requires replacement.
Replacing a thermostat is not the most difficult procedure, but it requires precision. It is important to choose an analogue with identical characteristics, otherwise operating mode the refrigerator will be damaged. An incorrectly selected sensor will lead to frequent engine starts or, conversely, to long downtimes.
Faults of the compressor and start relay
The compressor is the heart of the refrigeration unit. It is he who pumps refrigerant through the system, creating the necessary pressure. If you hear the motor humming, trying to start, clicking and turning off after a few seconds, the problem is most likely in the start relay or in the windings of the compressor itself.
The start relay is a small plastic block that fits over the contacts of the compressor. Inside there is a coil and a switching mechanism. Over time, the contacts may burn out and the spring may weaken. As a result, the relay cannot start the engine and the thermal protection is activated. Replacing the relay is something that you can do yourself if you have basic skills in working with the tool.
A more serious situation is an interturn short circuit of the compressor windings or its mechanical wear. In this case, the motor may hum, but not develop the required pressure, or it may overheat. You can check the compressor by measuring the resistance of the windings. Normal values usually range from 10 to 30 Ohms for the starting and running windings, and the resistance between the case and the contacts should be infinite.
| Symptom | Probable cause | Required actions |
|---|---|---|
| Motor buzzes, but does not start | The starting relay is faulty or the compressor is jammed | Replace the relay, check the compressor |
| The compressor runs constantly | The thermostat is faulty or freon is leaking | Check the settings, call a technician |
| The motor is hot, but the cold is not coming | Clogged capillary tube or broken valve | Requires professional cleaning |
| The refrigerator is silent and does not reacts | Open circuit, compressor or module burned out | Electrical circuit diagnostics |
If after replacing the relay the situation has not changed, and the compressor still does not start or works intermittently, a more in-depth diagnosis is necessary. In some cases, it is cheaper and more reliable to replace the entire compressor than to try to revive the old unit.
Freon leakage and clogged capillary system
One of the most insidious problems is a refrigerant (freon) leak. Freon is a working fluid that, evaporating and condensing, transfers heat. If a microcrack has formed in the circuit (often in the foamed part of the case or in soldering areas), the gas gradually evaporates. At first refrigerator it simply freezes worse, working for wear, and then it stops cooling completely.
Signs of a freon leak are quite specific. You may notice swelling of the back wall inside the freezer (in models with a weeping evaporator) or, conversely, a complete absence of frost on the evaporator in systems No Frost. In this case, the compressor can work continuously, trying to increase the temperature, but to no avail.
Clogged capillary tube is another reason for poor circulation. An ice plug (due to moisture) or clogging with oil oxidation products may form in the system. In this case, there is freon, the compressor creates pressure, but there is no circulation. A characteristic sign is a hot condenser (grid at the back) only at the beginning or end, and the rest of the part is cold.
⚠️ Attention: Repairs associated with a freon leak or blockage require a vacuum pump, a pressure gauge station and a supply of refrigerant. It is almost impossible to carry out these works efficiently on your own; you need to call a specialist with the equipment.
Failure in the defrosting system (for No Frost models)
Refrigerators with the system No Frost eliminate the need for defrosting, but create their own problems. The key element here is the evaporator, hidden behind a plastic panel. If the defrost system (heating element, defrost sensor or timer) fails, the evaporator becomes covered with ice. This ice blocks the ventilation ducts, and cold air stops flowing into the chamber.
As a result, the chamber is warm, food spoils, but the refrigerator itself can hum normally. Visually, you may not see the ice, since it is hidden. An indirect sign is the freezing of ice on the back wall inside the chamber or the appearance of puddles under the refrigerator when the water from the melting ice does not have time to evaporate.
☑️ Symptoms of a faulty defrosting system
For diagnostics, you need to remove the back panel in the freezer. If the evaporator is covered with a “fur coat”, and the heating element does not heat up when dialing or is not turned on by the timer, the problem has been found. Often the heating element itself burns out or the sensor that records the defrost temperature gets stuck.
A temporary solution can be to completely defrost the refrigerator for 24 hours with the doors open. This will allow the ice to melt and the system to work again. However, if the cause is a burnt heating element, the situation will repeat itself in a week. Therefore, after defrosting, it is worth diagnosing the elements of the defrosting system.
When you need to call a technician: critical breakdowns
There are a number of situations when self-repair not only will not help, but can also aggravate the situation. If you encounter failure of the motor-compressor (jamming, broken windings), a professional replacement is required with re-soldering of the tubes and vacuuming of the system. This is a complex technological process.
A specialist is also needed when a freon leak is detected in a foamed circuit. To find the location of the damage, special equipment is required, and restoring the tightness often involves installing an external evaporator (“crying” on the back wall), since opening the factory foam is a risky endeavor.
Do not forget about warranty obligations. If your refrigerator is less than 3-5 years old, any tampering with the design (opening seals, disconnecting pipes) will void the warranty. In this case, the only right decision is to contact an authorized service center.
Prevention and proper care of the refrigerator
To prevent the question “why the refrigerator does not freeze well” from arising for as long as possible, it is important to follow the operating rules. Regular defrosting (even for systems No Frost a preventive shutdown is recommended once a year) helps maintain heat transfer efficiency.
Keep the rear condenser grill clean. Dust and pet hair act as a thermal insulator, preventing the radiator from releasing heat. This forces the compressor to work with increased load, reducing its life. Wipe the grille with a soft brush or vacuum it every six months.
Do not overload the chambers with food and do not place hot food inside. A sharp jump in temperature and humidity creates an extra load on the moisture removal and freezing system. Proper loading (so that air can circulate between products) is the key to the long life of your refrigerator.
Why does the refrigerator freeze but does not turn off?
Most often this indicates a freon leak or a clogged capillary system. The compressor tries to compensate for the lack of cold by working non-stop. Also, the reason may be a “stuck” thermostat, which does not give the command to stop.
Is it possible to operate a refrigerator if it does not freeze well?
For a short time - yes, but you can’t work like that for a long time. Constantly working at the limit will lead to overheating and combustion of the compressor, the repair of which is very expensive. Products can also deteriorate.
How often do you need to change the rubber seal?
The service life of the seal is on average 5-7 years. If the rubber has become hard, cracked or no longer holds the magnet, it needs to be replaced to avoid problems with cooling and ice freezing.
Does the amount of food in the refrigerator affect the quality of freezing?
Yes, it does. An empty refrigerator loses cold faster when the door is opened, and a too tightly packed one disrupts air circulation. The optimal load is about 70% of the volume so that cold air can move freely.