The situation when a refrigerator stops performing its main function always takes you by surprise, threatening food damage and financial losses. If you notice that the chamber has become warmer than usual, and frost has disappeared on the walls or, conversely, ice has formed, you cannot ignore this. Violation of the temperature regime It can be caused by both trivial errors in operation and serious technical malfunctions of the unit.
First of all, it is worth assessing the scale of the problem: it does not hold cold one camera or the problem affected the entire device. Often, equipment owners panic ahead of time, without checking the tightness of the door or the thermostat settings. However, if simple measures do not help, and the compressor hums without interruption or is completely silent, then it’s time for a deeper diagnostics of the system. In this article we will look at the main reasons why your compressor may not reach the desired temperature. We will look at mechanical damage, refrigerant problems and electronic failures so that you can understand whether you need to urgently call a technician or whether the situation can be corrected yourself. system diagnostics.
In this article we will look at the main reasons why your refrigerator may not reach the desired temperature. We'll look at mechanical damage, refrigerant problems, and electronic failures so you can figure out whether you need to call a repairman right away or if the situation can be fixed on your own.
⚠️ Attention: If you smell gas or hear a hissing sound, immediately unplug the appliance and ventilate the room. This may indicate a leak of flammable refrigerant.
Failure of the door seal and tightness
One of the most common reasons why the refrigerator becomes warm is the loss of the seal of the chamber. Rubber seal (the cuff) dries out over time, cracks, or simply becomes contaminated with food debris, causing the door to no longer fit tightly to the body. Through the resulting cracks, warm air from the room constantly flows inside, causing the unit to work for wear, but not achieve the desired performance.
You can check the condition of the seal by simple visual inspection and tactile inspection. If the rubber becomes hard, sticky, or shows cracks, it needs to be replaced. It's also worth checking to see if the door is being blocked by hanging utensils or overcrowded shelves, which can create a gap even with a good cuff.
There is a simple test using a sheet of paper. Place a sheet of paper around the perimeter of the refrigerator door and try to pull it out. If the paper is pulled out easily and without resistance, it means that the seal is broken in this particular place.
- 🧊 The rubber has lost its elasticity and does not fit tightly.
- 🧊 Dirt or grease has accumulated on the seal, interfering with the fit.
- 🧊 Door skewed due to loose hinges or the heavy weight of the hanging shelves.
- 🧊 Mechanical damage to the seal (cut, rupture).
⚠️ Attention: When replacing the seal, make sure that the new cuff is designed specifically for your model. refrigerator. Universal solutions often do not provide proper tightness.
Problems with the thermostat and temperature sensors
If the refrigerator is mechanically working, but does not hold the set temperature, the problem may lie in the “brains” of the device - the thermostat or electronic sensors. Thermostat responsible for turning on and turning off the compressor depending on the temperature inside the chamber. If its contacts are stuck or the sensitive element is out of order, the compressor may either not turn on at all, or work continuously without turning off for rest.
In modern models with a system No Frost and electronic control, instead of a mechanical thermostat, air temperature sensors are used. Their readings may be distorted due to oxidation of the contacts or failure of the sensor itself. In this case, the display may display incorrect values, and the control system will issue erroneous commands to the compressor.
Diagnosing a mechanical thermostat often requires testing it with a multimeter or temporarily replacing it with a known-good analogue. Electronic sensors are tested for resistance, which should change depending on the ambient temperature.
How to check a mechanical thermostat?
To check, remove the thermostat and place its sensitive tube in a container with water at a temperature of about 5 degrees. Then heat the water. If there is no click when a certain temperature is reached, or the contacts do not ring with a multimeter, the part requires replacement. Be careful with the capillary tube - its damage will lead to freon leakage from the thermostat itself (if it is full).
Refrigerant leakage and disruption of freon circulation
The most serious technical problem due to which the refrigerator stops freezing is leakage refrigerant (freon). Without enough working fluid, heat cannot be transferred from the inner chamber to the outside. A leak can occur anywhere in the circuit: in the foamed part of the housing, in the evaporator or in the condenser, often due to corrosion or mechanical damage.
Symptoms of a leak are often quiet, almost silent operation of the compressor (it tries to pump, but the gas has left) or, conversely, its constant operation without achieving cold. There may also be swelling of the rear wall of the refrigerator or the appearance of oily spots where the tubes are damaged.
Restoring the tightness of the system is a complex procedure that requires special equipment for vacuuming and refilling. It is almost impossible to independently eliminate a leak in the foamed part of the housing without compromising the integrity of the thermal insulation.
| Symptom | Probable cause | Required actions |
|---|---|---|
| The compressor is working, but there is no cold | Freon leak or capillary blockage | Call a technician to find a leak |
| Oily stains on the floor or walls | Depressurization of the circuit | Urgent repair, disconnection from the network |
| Frost only at the entrance to the evaporator | Partial blockage of the system | Purge the system, replace the filter |
| The compressor is hot, but does not start | Problem with the start relay | Replacing the start-protective relay |
Faults of the compressor and start relay
The compressor is the heart of the refrigerator, and if it does not work, then the temperature will inevitably rise. However, the motor itself is not always to blame. Often the problem lies in starting relay, which supplies the impulse to start the engine. If the relay is burnt out or its contacts are stuck, the compressor either hums and clicks, but does not start, or is silent.
The compressor itself may fail due to an interturn short circuit of the windings or a wedge of the mechanical part. In the event of a short circuit, the motor may hum, consume increased current and heat up quickly, but the shaft will not rotate. This is a critical failure that requires replacement of the unit.
Checking the start relay is one of the simplest operations. You can remove it and shake it: if a ringing sound is heard inside (as if from broken glass), it means that the ceramic or plastic insert is destroyed and the relay needs to be replaced. The resistance of the compressor windings is also checked.
- 🔌 The starting or protective relay has burned out (a frequent and inexpensive breakdown).
- 🔌 An interturn short circuit has occurred in the motor windings.
- 🔌 Mechanical wedge of the compressor (full replacement required).
- 🔌 Electrical circuit failure or contact oxidation.
⚠️ Attention: If the compressor operates continuously for more than 20 hours a day, this can lead to its overheating and final failure. Allow the equipment to cool down before turning it back on after repair.
☑️ Compressor diagnostics
Clogging of the capillary tube and moisture removal system
Refrigerant circulation in the system occurs under pressure through a thin capillary tube. If moisture or oil breakdown products are present in the system, an ice blockage or particulate blockage may form. This blocks the flow of freon, and the cold stops flowing into the evaporator.
Signs of a blockage are often that the condenser (grid at the back) only partially heats up or remains cold, and the compressor is overloaded. In some cases, the system may periodically “thaw” itself, and cold appears for a short time, after which it disappears again.
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 saturated, its throughput drops, which leads to problems with temperature.
Why does moisture appear in the system?
Moisture enters the circuit due to poor-quality previous repairs (if evacuation was not done) or during depressurization. In combination with oil and freon, it forms an acid that corrodes the metal from the inside, creating pockets of corrosion and future leaks.
Failures in the electronic control module
In modern models of refrigerators, such as LG, Samsung or Bosch, the electronic module is responsible for all processes management. If the control board is “buggy”, it may not send a signal to turn on the compressor or fan, even if the temperature sensors show normal.
Failures are often caused by power surges in the network, which damage board elements, or moisture getting inside the case during defrosting. Symptoms include random blinking of indicators, clicking on buttons or displaying error codes.
Diagnostics of the module requires professional skills and equipment. You can often visually notice blackened tracks or swollen capacitors, but only a specialist with an oscilloscope can make an accurate diagnosis.
Frequently asked questions and answers (FAQ)
Why does the refrigerator work constantly and does not turn off, but there is not enough cold?
This is a classic sign of a freon leak or a clogged capillary system. The compressor tries to compensate for the lack of cold by working non-stop, but due to the disruption of refrigerant circulation, the temperature does not drop. It is also possible that the chamber will lose its seal.
Can a refrigerator stop freezing due to defrosting?
Yes, if you defrost it with sharp objects, you can damage the evaporator, which will lead to freon leakage. In addition, if the drainage system is not dried after defrosting, water may freeze in the drainage channels and disrupt the operation of the system. No Frost.
What to do if the refrigerator is warm and the freezer is cold?
Most likely, the problem is in the evaporator defrost system or the fan, which does not drive cold air from the freezer to the refrigerator department. Check whether the air duct is clogged with ice and whether the fan is working.
How to understand that the thermostat has failed?
If the refrigerator does not turn on at all or, on the contrary, works without interruption, “freezing” all the food to the point of stone, most likely the thermostat is faulty. In mechanical models, this is treated by replacement, in electronic models - by diagnosing the sensor.
Is it dangerous to use a refrigerator if it does not maintain the temperature?
Using it to store food is dangerous due to the risk of bacterial growth. For equipment, operating in abnormal mode (constant operation of the compressor) is fraught with overheating and fire, so it is better to turn off the faulty device until repaired.