The situation when the refrigerator is very coldis often perceived by users in two ways. On the one hand, this guarantees the safety of food in the heat, but on the other hand, it turns vegetables into ice blocks and milk into a hard block. If you notice that a thick crust of ice has formed on the back wall of the chamber, and the food in the upper drawers is freezing, it means that the cooling system is working in emergency mode.
The main reason lies in the imbalance between the production of cold and its regulation. Modern units, be it Liebherr, Bosch or Indesit, are equipped with complex electronics, which must automatically maintain the set temperature. However, failures in the sensors or mechanical damage to the seals can disrupt this fine tuning, forcing the compressor to work without stopping.
It is important to understand that ignoring the problem can lead to failure of expensive components. Constant work for wear and tear reduces the service life of the motor, and excess moisture inside the chamber contributes to the corrosion of metal parts. Therefore, having discovered the first signs of incorrect operation, it is necessary to carry out diagnostics.
You should not immediately call a specialist, since in many cases the cause can be eliminated yourself. Often it is a simple matter of incorrect installation of the thermostat knob or a clogged drainage hole. Careful inspection and consistent checks of systems will help save time and budget for family repairs.
Incorrect setting of the thermostat and operating mode
The most common and easy The removable cause is the human factor. If you recently moved the refrigerator, changed the mode, or simply accidentally touched the handle, the settings may have gone wrong. In older mechanically controlled models, the slider could move to the “Maximum” position, which causes the compressor to freeze continuously.
In digital models, the situation is similar, but more difficult to detect visually. The electronic control unit could have failed, and now it “thinks” that the chamber is +10°C, although in fact it is already -5°C. Sensor calibration in such cases, it often solves the problem without interfering with the design.
⚠️ Attention: If you have changed the settings, let refrigerator for 3-4 hours to stabilize the temperature. Do not check the result immediately after adjustment.
Check whether the Super Freeze mode is turned on. This mode is designed to quickly freeze large volumes of fresh food and disables compressor shutdown. If the function is activated, the refrigerator will freeze until you turn it off manually or the timer expires (usually 24-48 hours).
To check the current parameters, refer to the instructions for your model Samsung or LG. It shows standard values for normal food storage. Typically this range is from +2 to +4 degrees Celsius. If your settings go far beyond these limits, return them to nominal.
Failure of the thermostat (thermostat)
If the settings are in order, but the refrigerator continues to “catch up” with cold, it is most likely out of order. thermostat. This device is responsible for opening the electrical circuit when the set temperature is reached. In mechanical models, this is a capillary tube with a bellows; in electronic models, it is a temperature sensor (thermistor).
If a mechanical thermostat breaks down, the contacts simply stick in the closed position. The compressor receives current constantly and does not turn off, even when an ice shell has already formed inside. Visually, this can be seen by the absence of a click when turning the regulator knob to the extreme position.
- ❄️ Symptom of malfunction: The compressor hums without interruption, without going into rest mode.
- 🧊 Symptom of malfunction: In the refrigerator compartment, the food is covered with frost, and in the freezer there is a thick layer snow.
- 🔌 Symptom of malfunction: When the thermostat is forcibly turned off (the wires are disconnected), the compressor stops working.
Replacing the thermostat is a procedure accessible to a home handyman, but requires caution. The capillary tube of the new regulator must be installed in exactly the same way as the old one was installed so that it correctly reads the air temperature. For models Atlant or Biryusa this is a standard repair procedure.
How to check the thermostat with a multimeter?
To check, remove the thermostat and place its sensitive part into a container with water and ice (temperature about 0°C). Test the contacts with a multimeter. If the device shows a break (one on the screen) at this temperature, the thermostat is working (it opens the circuit to cold). If it shows zero (the circuit is closed), the part is faulty and requires replacement. Important: the opening temperature may differ for different models.
Malfunction of the temperature sensor (thermistor)
In refrigerators with a system No Frost and electronic control, the thermostat function is performed by the thermistor. This is a semiconductor element whose resistance changes depending on temperature. If it “lies” and shows the control module that it is warm in the chamber, it will constantly turn on the cooling.
Most often, the sensor is simply dirty or the contact is oxidized. However, physical failure also occurs. In such cases, an error may appear on the display, but not always: some systems continue to operate in emergency mode, ignoring the readings of the faulty sensor.
Diagnostics are carried out by measuring resistance. For each model Bosch, Siemens or Whirlpool there is a table corresponding to resistance and temperature. If the actual measurements differ greatly from the tabulated ones, the sensor must be replaced.
☑️ Checking the temperature sensor
It is worth noting that in two-chamber refrigerators there can be several sensors: in the refrigerator compartment, in the freezer and even in the zero zone temperature. Localization of the problem depends on where exactly freezing occurs. If the ice is only at the top, look at the fridge compartment sensor.
Refrigerant leak and problems with the cooling circuit
Paradoxically, a freon leak can also lead to the effect of “severe frost,” but in a local area. If a microcrack forms in the system, the refrigerant escapes and the pressure drops. As a result, freon boils earlier than expected, creating a zone of extremely low temperatures at the beginning of the evaporator, while the rest of the chamber can be warm.
This phenomenon is often called a “snow coat” in one corner of the back wall. You can see ice building up in a localized patch while the rest of the surface is dry. This is a sure sign of a leak in the cooling circuit cooling circuit.
| Symptom | Probable cause | Nature of ice | Actions |
|---|---|---|---|
| Ice all over the back wall | Thermostat/sensor is faulty | Uniform, thick layer | Replacing the regulator |
| Ice in one corner/spot | Freon leak | Dense, lumpy growth | Looking for leaks, refilling |
| Frost on products | Poor door fit | Crystalline, loose | Hinge adjustment |
| Ice in the pan and on the bottom | Drainage clogged | Water turning into ice | Cleaning the tube |
Leak elimination is a task for professionals. Special equipment is required to find the location of the damage (pressurized nitrogen is often used) and evacuate the system before refilling. You cannot add freon yourself “by eye” - this will lead to permanent breakdown of the compressor.
⚠️ Attention: Freon itself is not consumed during operation. If it is missing, it means there is a hole somewhere. Simply “refilling” the refrigerator without eliminating the leak is a temporary solution for a couple of weeks.
Problems with door seals and airtightness
The entry of warm, humid air from the room is another cause of icing. If rubber seal the door does not fit tightly, air is constantly sucked inside. The moisture from it condenses on the cold walls and instantly freezes, forming snowdrifts.
You can check the tightness with a simple test with a sheet of paper. Clamp the sheet with the door around the perimeter. If it comes out too easily or falls out on its own, the seal in this place does not work. Often the reason lies in contamination of the rubber or misalignment of the door leaf.
To restore the elasticity of the rubber Indesit or Ariston you can try heating it with a hairdryer or treating it with silicone grease. If the seal is physically deformed (torn, torn out of the groove), only a complete replacement will help.
Also check the door hinges. Over time, they may sag, and the upper corner of the door will no longer close tightly. Adjusting the hinges usually takes 10-15 minutes and requires only a set of hexagons or a screwdriver.
Failure of the control module and electronics
In modern models, such as Electrolux or Haier, the whole process is controlled by the “brain” - the electronic control module. If the compressor control triac on the board burns out or the capacitor “floats,” the refrigerator may receive a false command for continuous cooling.
Electronics are sensitive to power surges in the network. Even if the module looks intact from the outside, its logic may be broken. In some cases, a full reset helps (disconnecting from the network for 15-20 minutes), but more often a flashing or replacement of the board is required.
Diagnostics of the module requires knowledge in electronics and the availability of circuits. If you see chaotic symbols on the display, flashing indicators, or the refrigerator behaves inappropriately (either it freezes a lot or does not freeze at all), the problem is most likely in the “electronics.”
Frequently asked questions about the problem of freezing
Is it possible to operate a refrigerator if it gets very cold?
For a short time - yes, the food will not spoil. However, prolonged operation in this mode will lead to freezing of the evaporator, which will reduce the efficiency of heat transfer and cause the compressor to work with overload. This will shorten the service life of the unit.
Why did ice immediately form in the new refrigerator?
During the first load, the quick freezing mode may have been activated, or you placed warm foods in the chamber. Also check whether the refrigerator is level; a misalignment may interfere with the circulation of the refrigerant.
How to defrost a refrigerator if it stops turning off?
You must completely unplug the appliance, remove all food and leave the doors open for at least 24 hours (preferably for a day). Do not use a hairdryer or a knife to chip ice - this will damage the evaporator.
Does the amount of food affect the strength of frost?
Yes, an empty refrigerator freezes faster and stronger, since the heat capacity of the air is small. Loading with products (especially liquids) stabilizes the temperature, acting as a heat accumulator.