Situation, when The refrigerator freezes very much, is familiar to many owners of household appliances. Instead of fresh food, which should be stored at a temperature of about +4°C, an ice crust forms in the main chamber, and vegetables turn into ice. This behavior of the unit not only spoils the reserves, but also signals serious malfunctions in the operation of the control system or tightness.
Excessive cooling often leads to the compressor working without interruption, trying to achieve unattainable values, which leads to its overheating and rapid wear. Why did the refrigerator start to freeze more than usual? The answer lies in the imbalance between the production of cold and its retention inside the chambers. Ignoring the problem can lead to expensive compressor repairs or a complete replacement of the heat exchanger.
In this article we will analyze in detail the mechanical and electrical causes of hypothermia, diagnostic methods and troubleshooting methods. You will learn how to check the thermostat, set operating modes and determine when you need to call a technician and when you can handle it on your own. A critical sign of a breakdown is the continuous operation of the motor even with the power turned off for a short time (residual cold), which indicates sticking contacts.
The main causes of excessive cooling in the refrigerator camera
The first thing you need to understand: a refrigerator is a closed system, where each element affects the overall temperature background. If the refrigerator is very cold, this means that the refrigerant is circulating correctly, but the control of this process is impaired. Most often, the problem lies in sensors that incorrectly read the temperature, or in actuators that do not receive a signal to stop.
One of the most common reasons is failure of thermostat (thermostat). This mechanical or electronic device is responsible for breaking the compressor power circuit when the set temperature is reached. If its contacts are “stuck” in a closed state or the sensitive element has lost its properties, the motor will work continuously, pumping in cold.
In models with a system No Frost and electronic control, the thermal sensor (thermistor) is responsible for the temperature regime. Its resistance changes depending on temperature. If the sensor “lies” and shows the controller that the chamber is warm, the electronics will keep the compressor on. It is also worth checking air damperwhich regulates the supply of cold air from the freezer to the refrigerator compartment.
Don't forget about the human factor. Often, users accidentally set the controller to “Super Freeze” or “Max Cool” mode, which is designed to quickly freeze food and ignores standard temperature shutdown thresholds. In this mode the refrigerator freezes very muchuntil the timer turns off the function or the user returns the settings manually.
Malfunctions of the thermostat and thermostat
The thermostat is the “brain” of the old refrigerator and an important component of the modern one. It is he who decides when to turn on and when to turn off the compressor. If you notice that the refrigerator stopped turning off and the temperature inside has dropped below zero, in 80% of cases this element is to blame. Mechanical thermostats lose calibration over time, and their rod stops responding to the expansion of the bellows with gas.
In electronic models, the thermostat function is performed by a control unit that receives data from temperature sensors. If temperature sensor failure (for example, its resistance has changed), the controller receives false data. It seems to him that the cell is +10°C, although in fact it is already -5°C. It continues to drive freon, causing deep freezing of food.
⚠️ Attention: Before replacing the thermostat, make sure that the capillary tube is not kinked and fits tightly to the evaporator. Poor contact of the tube with the evaporator body leads to a delayed reaction of the thermostat and freezing.
Diagnostics of the thermostat requires caution. In mechanical models, you can try to temporarily close the contacts to check the operation of the motor, but to check for openness (which is what we need when there is a problem with overcooling), it is better to use a multimeter in continuity mode, cooling the sensor. If the contacts do not open during cooling, the part must be replaced.
☑️ Checking the thermostat
Replacing the thermostat is not a complicated procedure, but requires precision. It is important to choose an analogue with identical parameters, especially the length of the capillary tube and the on/off temperature. Installing an unsuitable model can lead to the refrigerator will not work correctly: either turning on too rarely or not turning off at all.
Problems with the damper and the No Frost system
In modern two-chamber refrigerators, the cold is produced in the freezer chamber, and is supplied to the refrigerator through an air duct. Responsible for this process is damper. If the mechanism is clogged with food, ice, or the drive motor fails, the damper may become stuck in the open position. As a result, cold air freely enters the upper chamber, causing severe hypothermia.
System No Frost also has its own nuances. If the cold air distribution fan is running at increased speed due to a control board failure, or if the evaporator defrost sensor is reporting incorrect data, the system may go into a heavy cooling emergency mode. This is a protective reaction, which, however, is detrimental to the products in the main chamber.
Often the problem lies in freezing of the air duct itself. An ice plug may mechanically prevent the damper from closing, or, conversely, ice builds up on the sensor, distorting the readings. In such cases, complete defrosting of the unit is required for at least 24 hours.
- ❄️ The damper is open: Mechanical jamming or breakage of the drive rod.
- 🌬️ Fan: Continuous operation at high speeds due to electronics failure.
- 🧊 Freezing: Ice blocks the movement of the damper or distorts sensor readings.
To check the damper, it is necessary to dismantle the rear panel of the refrigerator compartment (in some models, access is through the lampshade). Visually evaluate the position of the damper at different temperature settings. If it does not respond to changes, you will need to replace the damper motor or the entire air duct assembly.
How to check the damper motor?
To check the damper motor, apply 12V or 220V (depending on the model) directly to it. If the shaft does not move or moves jerkily with a humming noise, the motor is faulty. Also check the resistance of the windings with a multimeter: an open or short circuit will indicate the need for replacement.
The influence of sealing rubber on the operation of the compressor
It would seem that if the refrigerator is very coldthen the tightness should be in order. However, the reverse logic works here. If the sealing rubber on the door is worn out, torn or simply dirty, warm air from the outside constantly enters the chamber. Sensors detect an increase in temperature and command the compressor to work more intensely.
In an attempt to compensate for heat loss and achieve the set parameters, the unit operates at the limit of its capabilities. As a result, the temperature in the center of the chamber may be normal, but at the back wall, where the evaporator is located, the food freezes. The compressor simply does not have time to turn off, creating the effect of a “perpetual motion machine” and deep freezing.
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 falls out or is pulled out without effort, the seal does not fit. Also inspect the rubber for cracks, swelling and dirt. Dirt often interferes with a tight seal, creating microcracks.
⚠️ Attention: Do not use aggressive chemicals to clean the seal. Chlorine and acetone can dry out the rubber, making it hard and brittle, which will only make the leak problem worse. Use warm soapy water.
If the seal has simply come off the body, it can be glued with a special glue for rubber. If the rubber has lost its elasticity (“oaky” to the touch) or has become deformed, only a complete replacement of the contour will help. Sometimes heating the seal with a hairdryer helps to return it to its original shape, but this is a temporary measure.
Settings and operating modes: human factor
Before taking up the tools, it is worth eliminating trivial errors in operation. Modern refrigerators, such as Liebherr, Bosch or LGhave complex control systems. Accidental pressing of buttons by children or a malfunction in the electronic module can put the device into maximum power mode.
The “Super Freeze” or “Vacation” mode (in some interpretations) radically changes the operating algorithm. In the first case, the compressor runs continuously, ignoring the temperature in the refrigerator compartment, to quickly freeze fresh meat in the freezer. If you forget to turn off this function, the refrigerator will freeze. all the contents of the main chamber.
It is also worth checking the settings of the temperature zones. Some models allow you to independently adjust the temperature in different compartments. Make sure that you do not set the minimum possible value (+1°C or +2°C) instead of the standard +4°C... +5°C. A difference of a couple of degrees can be critical for storing vegetables and dairy products.
| Mode / Setting | Description of influence | Recommended value |
|---|---|---|
| Super Freeze / Max Cool | Continuous operation of the compressor | Off (Auto) |
| HK temperature | Main chamber cooling level | +4°C ... +5°C |
| MK temperature | Freezer cooling level | -18°C |
| Smart cooling | Automatic adaptation (Eco) | Enabled |
If after resetting the settings to factory settings (Reset) the problem persists, then the problem is not a software failure, but a technical malfunction. Electronic control modules rarely “glitch” on their own; more often, oxidized contacts or power surges in the network are to blame.
Do-it-yourself diagnostics and troubleshooting
If you decide to carry out diagnostics yourself, start with a visual inspection and listening to the operation of the unit. The refrigerator is very cold and is it buzzing without interruption? This is a sign that the shutdown cycle is not occurring. If it turns on and off frequently, but everything inside is frozen, the problem is in the thermostat or a freon leak (although with a leak, undercooling is more often the case; in the initial stage or with improper charging, overcooling of individual zones is also possible).
To replace the thermostat or sensor, you will need to remove the back cover (in older models, inside the chamber, in new ones - outside or in the ceiling). Be sure to disconnect the device from the mains before starting work! Carefully remove the regulator knob, unscrew the mounting screws and remove the thermostat housing. Pay attention to the fit of the capillary tube.
When working with electronics, be careful about the markings of the wires. Before disconnecting the chips, take a photo of the connection diagram. An error in one contact during assembly can lead to a short circuit or failure of the control board.
If after replacing the sensors and checking the damper the problem does not disappear, the control board may need to be reconfigured or the module itself needs to be replaced. In the case of refrigerators Indesit or Atlant a frequent problem is oxidation of contacts in connectors, which can be treated by cleaning with alcohol and restoring contact.
What to do if the refrigerator freezes in only one corner?
Local overcooling (for example, at the back wall) at normal temperature in the rest of the chamber often indicates that the food is lying too close to the evaporator or flap. Move the food 5-7 cm from the back wall. This may also be a sign of partial blockage of the capillary system or the initial stage of a freon leak, when the refrigerant boils unevenly.
Can a lack of freon cause severe frost?
Paradoxically, but yes. If there is a freon leak and subsequent poor-quality refilling (if the technicians added gas “by eye”), the evaporator “starvation” effect may occur, which leads to its intensive, but local cooling. However, more often, if there is a leak, the refrigerator simply stops freezing at all.
How often should you defrost the refrigerator to avoid failures?
Systems No Frost do not require manual defrosting, but a preventive shutdown once a year for washing is useful. Drip systems (“crying evaporator”) require defrosting at least 2 times a year. The accumulation of ice in the drainage channel can disrupt the outflow of water, which will lead to freezing of the sensors and malfunctions.