The situation when a refrigerator suddenly stops performing its main function always takes you by surprise. Products begin to deteriorate, an unpleasant smell appears, and an ice crust forms on the shelves or, conversely, room temperature reigns. Malfunction of the refrigeration unit is stress that requires an immediate but balanced decision. Often, users begin to panic and call a technician even before they have checked the basic things that can be fixed on their own.
In this article we will analyze in detail why your refrigerator may not freeze well, and systematize knowledge about possible breakdowns. We will look at both simple operating errors and complex technical problems that require professional intervention. Understanding the principles of operation of the compressor and thermostat will help you quickly diagnose the problem and save your budget on repairs.
It is important not to ignore the first signs of equipment malfunction. If you notice that Foods freeze more slowly usual or a “fur coat” has formed in the freezer, this is a signal that the cooling system is not working correctly. Next, we will move on to a detailed analysis of the reasons.
⚠️ Attention: If you heard a loud bang or smelled burning immediately after the equipment stopped cooling, immediately disconnect the device from the power supply. Further operation may lead to a fire in the wiring or complete failure of the electronics.Checking the settings and operating mode
Before looking for complex technical faults, you need to make sure that the problem does not lie in a banal control error. Often, users accidentally touch the temperature controls or change operating modes while cleaning. In modern models with electronic control, the failure could have occurred due to a power surge in the network. Temperature mode it could have switched to a warmer one, which is why (the compressor) simply does not turn on at full power.
Pay attention to the indicators on the control panel. If the defrost or alarm icon is on, this may indicate that the door has been open for a long time or warm food has been placed in the compartment. It's also worth checking to see if the Vacation or Eco mode is activated, which specifically keep the temperature higher to save energy. In some models Samsung or LG the settings are reset after a short-term shutdown of the light.
Make sure that you correctly understand the thermostat readings. On mechanical models, the number “1” often means minimum cooling, and “7” - maximum, although it happens the other way around. Incorrect setting leads to the compressor running idle or, conversely, not turning off, trying to achieve the impossible.
📊 How do you set the temperature in refrigerator?Minimum (1-2)Average (3-4)Maximum (5-7)I don’t know / It’s as it wasFor accurate diagnosis, you can use an external thermometer by placing it into a glass of water on the middle shelf. This will allow you to objectively assess real temperature inside the chamber, without relying on the sensations or indicators of the device.
Problems with the seal and tightness
One of the most common reasons why the refrigerator has stopped freezing normally is a violation chamber tightness. If warm air from the room constantly penetrates inside, the cooling system cannot cope with heat removal. As a result, ice forms on the walls, and the products remain warm. Rubber seal The doors dry out over time, crack or deform, no longer fitting tightly to the body.
You can check the tightness with a simple test with a sheet of paper. Press the door around the perimeter of the sheet and try to pull it out. If the paper comes out easily and without resistance, it means that the seal does not fit in this place. Also carefully inspect the rubber for cracks, tears or dirt. Grease and sticky stains can interfere with tight contact, creating microscopic gaps for air.
Sometimes the problem lies not in the rubber itself, but in the misalignment of the door. If the refrigerator has not been washed for a long time or there are heavy objects on the shelves, the door may sag. In this case, even a new seal will not save the situation. Adjusting the hinges is a procedure that can often be done independently using a screwdriver and a level.
It is worth remembering that constant work compressor due to leakage leads to its overheating and reduced service life. Loss of tightness is responsible for 30% of cases of insufficient cooling, which can be eliminated without calling a technician.
Malfunctions of the defrosting system (No Frost)
In refrigerators with the system No Frost ("no frost") the problem of poor cooling is often associated with a violation of the evaporator defrost cycle. Inside the case, hidden from the user’s eyes, there is an evaporator on which moisture from the air freezes. It turns on periodically Defrost heating element, which melts the ice and water flows into the drain pan. If this process is disrupted, the evaporator becomes overgrown with ice, blocking the circulation of cold air.
Air simply cannot pass through the ice plug to the products. The freezer compartment may be cold, but the refrigerator compartment may be warm. The main elements that fail in this system: heating element, defrost sensor (defroster) or timer (in old models) / control board (in new ones). Sensor malfunction leads to the fact that the heater either does not turn on at all or does not turn off on time.
Diagnostics of this problem requires partial disassembly of the rear wall of the freezer. Visually you will see a thick layer of ice on the evaporator and fan. If the fan is frozen and does not spin, cold air is not forced into the chamber. Replacing the heating element or sensor is a standard repair procedure that takes the technician about an hour.
⚠️ Attention: Do not try to pick ice from the evaporator with a knife or sharp objects! You can damage the freon tubes or puncture the heating element, which will lead to expensive repairs or a refrigerant leak.☑️ Symptoms of a No Frost system failure
Completed: 0 / 5Refrigerant (freon) leak
If the refrigerator is humming, the compressor is running, but there is no cold anywhere, most likely it has occurred Freon leak. The refrigerant circulates in a closed circuit and should not be consumed or replaced during operation. If its amount in the system has decreased, the cooling efficiency drops critically. Freon is odorless and colorless, so it is difficult to detect a leak by external signs.
The causes of leakage can be different: mechanical damage to the tubes (for example, when defrosting with a knife), corrosion of the metal part of the evaporator (often hidden in the foamed layer of the housing) or factory defects in welds. In models with a foamed evaporator, corrosion can begin from the inside, and this does not appear externally until the gas is completely released.
Leakage symptoms often appear gradually. First, the refrigerator begins to freeze worse, then the compressor starts working almost non-stop, trying to compensate for the lack of refrigerant. At some point, it stops turning on completely or turns on for a short time. Condenser (grid at the back) remains cold or warm only partially.
Symptom Normal condition If there is a freon leak Condenser temperature (rear) Hot over the entire area Warm or cold, uneven heating Operating mode compressor Cyclic (on/off) Works constantly or very rarely Frost on the evaporator Uniform layer Absent or in “pieces” at the entrance Cooling Stable Absent or very weak Restoring the system after a leak includes finding the location of the damage, soldering, evacuating the system and filling with new gas. This is a complex procedure that requires special equipment and qualifications.
Malfunction of the compressor and start relay
The compressor is the “heart” of the refrigerator, creating pressure for the circulation of the refrigerant. If it is faulty, cold is not physically produced. Often the problem lies not in the motor itself, but in starting relay a small device that helps the engine start. If the relay is burned out, the compressor hums, 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 (mechanical jamming of the piston group). In the case of a wedge, the engine tries to start, hums, heats up, but the shaft does not spin. In this case, the thermal protection relay opens the circuit and a characteristic shutdown click is heard. After cooling, the cycle is repeated.
Replacing a compressor is a serious repair, which includes:
1. Draining old oil and freon.
2. Removing the old motor.
3. Installation of a new compressor and filter-drier.
4. Soldering connections and vacuuming.
5. Refilling with refrigerant.
Is it possible to replace the compressor yourself?
Theoretically, yes, if you have the skills to solder copper pipes, a pressure gauge station, a vacuum pump and a freon cylinder. However, without experience, there is a high risk of damaging the new compressor or poor-quality soldering of the system, which will lead to repeated failure in a short time.
It is worth considering that if the refrigerator is more than 10-12 years old, replacing the compressor may not be economically feasible. The cost of a new motor and the work of a technician can be up to 70% of the price of a new device. In such cases, it is often more profitable to purchase new equipment with a guarantee and a modern energy efficiency class.
Clogged capillary tube
The capillary tube is a very thin copper pipe connecting the condenser and evaporator. Through it, liquid freon is supplied to the low pressure zone. Due to its microscopic diameter, this tube is prone to clogging. Moisture or oxidation products may remain in the system, which freeze in the narrowest place, forming an ice plug. Symptoms of a blockage are similar to a freon leak: the compressor works, but there is no cold. However, there is a distinctive feature: sometimes the refrigerator can start freezing normally after a long shutdown (10-12 hours), when the plug has time to melt. But after a few hours of work the problem returns. Also, the condenser can only heat up to the middle. ice plug.
The symptoms of a blockage are similar to a freon leak: the compressor works, but there is no cold. However, there is a distinctive feature: sometimes the refrigerator can start freezing normally after a long shutdown (10-12 hours), when the plug has time to melt. But after a few hours of work the problem returns. Also, the capacitor can only heat up to the middle.
To eliminate the blockage, you need:
- Blowing the system with nitrogen under high pressure.
- Replacing the filter drier (it retains moisture and dirt).
- In rare cases, replacing the section capillary tube.
⚠️ Attention: Do not try to clean the tube yourself by supplying air with your mouth or a compressor without vacuuming. Introducing moisture or oil into the system will lead to an irreversible chemical reaction with freon and breakdown of the compressor.Prevention of such problems is the use of high-quality components during previous repairs and preventing the refrigerator from operating with the doors open for a long time, which increases the humidity inside the circuit.
Frequently asked questions (FAQ)
Why does the refrigerator freeze but does not turn off?
This may indicate freon leak, clogged capillary tube or thermostat malfunction. The compressor is working hard, trying to reach the set temperature, but cannot do so. The reason may also be a leaky door.
Can the refrigerator stop freezing due to overload with food?
Yes, if the food blocks the air circulation channels (especially in the No Frost system). Cold air cannot be distributed evenly throughout the chamber. Also, you cannot put hot dishes, this upsets the thermal balance.
What to do if there is water in the refrigerator compartment and ice in the freezer?
Most likely, the drainage channel for discharging melt water is clogged. The water does not go into the pan; it overflows over the edge of the groove and flows into the chamber or onto the floor. It is necessary to clean the drainage hole with a soft wire or a brush.
How long should you defrost the refrigerator before diagnostics?
To completely defrost and check the No Frost system, it is recommended to turn off the device for at least 12, and preferably 24 hours. This will allow the ice to completely melt and evaporate, which is necessary for the correct operation of the sensors the next time you turn it on.
Is it dangerous to use a refrigerator with a faulty seal?
This is not life-threatening, but it leads to excessive energy consumption and food spoilage. However, if the compressor works without interruption for a long time due to loss of cold, it may overheat and fail, which is already a fire hazard.