The situation when the refrigerator began to freeze in the plus chamberis one of the most common complaints from owners of household appliances. Instead of the usual +2...+5 °C, the products in the upper compartment are covered with an ice crust, vegetables freeze, and milk turns into ice in a matter of hours. This is not just discomfort, it is a direct threat to the quality of the stored food and a signal that the unit has malfunctioned.
The reasons for this behavior can vary from a banal error in the settings to a serious breakdown compressor or a refrigerant leak. Understanding the operating principle of your model - be it a classic two-chamber system or a modern No Frost - will be the first step to solving the problem.
In this article we will analyze in detail the mechanics of the process, identify key components that require checking, and provide a step-by-step algorithm of actions to restore normal temperature conditions.
⚠️ Attention: If you notice that a thick layer of ice forms on the walls of the chamber and food freezes, do not try to immediately disassemble the back panel. First, exclude simple settings and allow the equipment to completely defrost (at least 24 hours), since an ice jam can cause a false diagnosis.
The principle of operation and the role of the thermostat
To understand, why does the refrigerator freeze a lotyou need to understand how the cold is distributed inside. In classic models, cold air from the freezer falls down or is supplied by a fan. This process is controlled by thermostat (thermostat) - a device that reads the temperature and commands the compressor to turn on or off.
If this sensor “lies” or gets stuck in the “on” position, the compressor will work non-stop, pumping out cold even when the target temperature has already been reached. In models with Electronic Control an electronic control module is responsible for this, which receives data from temperature sensors.
A frequent mistake is setting the regulator to the maximum value (usually indicated by the number 7 or the word Max). In this mode, the equipment operates at the limit of its capabilities, which in winter, when the ambient temperature in the room is low, leads to freezing of the plus chamber.
Malfunctions of the No Frost system and damper
In systems No Frost and Low Frost air circulation occurs forcibly. A damper (damper) is installed between the freezer and refrigerator compartments, which regulates the flow of cold air. If the damper mechanism is stuck in the open position, icy air freely enters the upper compartment.
This often happens due to the formation of an ice plug in the channel or failure of the damper motor. You may hear a characteristic cracking or clicking noise as the unit tries but fails to close the channel. As a result, the temperature in the refrigerator falls below zero.
It is also worth checking the condition of the fan. If it works intermittently, the sensors may read incorrect data, causing the cooling system to work harder than necessary.
How to check the damper without disassembling?
Open the refrigerator door and listen. If you hear the sound of the damper motor operating (a quiet hum or click) immediately after opening the door or changing settings, the mechanism is probably alive. If there is silence or you can hear the crackling of jammed plastic, the problem is in the damper.
Problems with the seal and heat transfer
It would seem that if the refrigerator freezes too much, then the seal has nothing to do with it. However, if the rubber seal door does not fit tightly, warm, moist air constantly flows inside. The system, trying to compensate for heat loss and achieve the set temperature, forces the compressor to work in increased mode.
As a result, you get frozen products at the back wall, although there may be heat in the center of the chamber. Check the integrity of the rubber: there should be no cracks, adhering debris or deformations.
A simple test with a sheet of paper will help identify the problem: clamp the sheet with a door around the perimeter. If it pulls out too easily without resistance, it means that the seal is broken and the seal needs to be replaced or the hinges adjusted.
Diagnostics of the electronic control module
In modern models, such as LG, Samsung or Bosch, the entire process is controlled by electronic module. A failure in its operation or a “glitch” of the firmware can lead to the fact that the command to turn off the compressor simply will not be sent.
Symptoms of an electronics malfunction often include chaotic display behavior, spontaneous turning on and off of the light, or a situation where the refrigerator is freezing independent from the position of the regulator. In such cases, a complete system reset (Hard Reset) often helps.
To perform a reset, you must disconnect the appliance from the network for 15–20 minutes. This will allow the capacitors to discharge and the controller memory to clear temporary errors. If after turning on the problem returns after a few hours, it is likely that the module or temperature sensor needs to be replaced.
☑️ Electronics diagnostics
Table of main causes and symptoms
For quick orientation in the problem, use the summary table. It will help to compare the observed symptoms with a probable malfunction.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| Ice on the back wall, food at the wall is frozen | The thermostat or defrost sensor is faulty | Low |
| Everything freezes, including the center of the shelf | The damper is jammed or the board is faulty | Medium |
| The compressor hums constantly without turning off | Freon leak or thermostat failure | High |
| Frost in only one corner of the chamber | Air circulation is impaired (No Frost) | Average |
When a call to a technician is required
There are a number of situations when self-repair can lead to final breakdown of the unit. If you checked the settings, defrosted the equipment, but the refrigerator continues to freeze with excessive force, the problem may lie in the refrigerant circulation system.
Replacement compressor, search for microcracks in the circuit or refill freon require specialized equipment and skills. Also, do not climb inside the foamed housing yourself if a leak is suspected in the foamed part of the evaporator.
⚠️ Attention: Opening the cooling system (disconnecting the tubes) without a vacuum pump and a pressure gauge station is prohibited. This will lead to moisture entering the circuit and burning out the new compressor within a few days.
Prevention and proper operation
To avoid recurrence of the situation, monitor the loading of the camera. Do not put hot food in or overcrowd the refrigerator, blocking the air ducts. In systems No Frost free air circulation is critical.
Check the drainage hole regularly. If it is clogged, the condensate does not escape, freezes and can block the operation of the sensors or damper, which indirectly affects the temperature.
Following these simple rules will extend the life of your equipment and keep food fresh.
Why can't you put it hot?
A hot pan not only makes you The compressor wears out, but also creates a powerful flow of steam. This steam instantly condenses on the cold walls and freezes, creating a “fur coat” that disrupts heat exchange and throws off sensor readings.
Is it possible to temporarily solve the problem by simply turning off the refrigerator?
Yes, complete defrosting within 24 hours can remove an ice plug in the air duct or “unfreeze” a stuck thermostat. If after turning on the problem returns after 1-2 days, then the reason is deeper (faulty sensor or damper).
Why do vegetables freeze in the refrigerator compartment, although the thermostat is at minimum?
Most likely, the thermostat itself has failed (it “does not feel” the cold) or the air supply damper is stuck in the open position. The minimum position of the regulator in this case does not affect the operation of the compressor.
Does the temperature in the room affect whether the refrigerator freezes?
Yes. If the room is cold (below +16 °C) and the refrigerator thermostat is located inside the refrigerator compartment, it may not correctly read the temperature difference, causing the compressor to work longer than usual. It is also not recommended to keep the refrigerator on an unheated balcony in winter.
What should you do if, after defrosting, the refrigerator starts to freeze very hard again after a week?
This is a sure sign that the problem is not in the ice plug, but in the hardware. It is necessary to check the resistance of the temperature sensor, the serviceability of the damper motor or the electronic control board. Diagnostics with a multimeter is required.