The situation when, instead of fresh food, you find blocks of ice and frozen vegetables in the refrigerator compartment is familiar to many owners of household appliances. This is not just an inconvenience, it is a signal that there has been a failure in the thermoregulation system that requires immediate intervention. If you leave the problem unattended, you can not only ruin your food supplies, but also cause a breakdown of the compressor due to its operation in enhanced mode.
The first thing to do is not to panic and carry out an initial diagnosis. Most often, the reason lies not in a complex breakdown, but in incorrectly set settings or banal violations of operating rules. Understanding the operating principles of compressor and the heat removal system will help you quickly isolate the problem. In this article we will look at the main reasons why the unit starts to work too intensely and how to eliminate them.
It is important to understand that modern models Bosch, LG or Indesit can behave differently depending on the type of control. While mechanical thermostats require manual calibration, electronic systems can throw a sensor error and continue to freeze. Let's figure out how to distinguish a user error from a technical malfunction.
Checking the thermostat settings and operating mode
The most common and easily eliminated cause of excessive cooling is incorrect temperature settings. Users often accidentally touch the regulator while cleaning or loading food, moving it to the maximum coldposition. On mechanical models, this is a rotary knob with numbers, where a higher value means a lower temperature.
If you have an electronically controlled model, the situation may be more complicated. A failure in the electronic control unit or a power surge could put the refrigerator into Super Freeze (Super Freeze) mode. In this mode, the compressor works without stopping, ignoring the readings of temperature sensors in the refrigerator compartment, in order to quickly freeze food in the freezer, but cold air inevitably enters the main chamber.
⚠️ Attention: If you set the regulator to the minimum cooling mode (number 1 or Min), and the temperature still drops below zero, then the problem is not in the settings, but in a sensor malfunction or thermostat.
For models with a display, you need to enter the settings menu and check the current settings. The normal temperature for the refrigerator compartment is considered to be from +3 to +5 degrees Celsius. If the display shows -5 or lower, the system is not operating correctly. Try resetting the settings to factory values by unplugging the device for 10-15 minutes.
In some cases, the problem lies in the fast freezing activation button sticking. This is typical for touchpads that may have become dirty or wet. Carefully inspect the control panel: if the indicator Super Freeze is constantly on, try pressing and holding the corresponding button to deactivate the function.
Malfunctions of the thermostat and temperature sensors
If the settings are normal, but the refrigerator continues to freeze all the contents, most likely it has failed thermostat (thermostat). This device is responsible for opening the compressor power circuit when the set temperature is reached. When the thermostat breaks in the “on” position, the circuit does not open, and the motor runs continuously, turning the chamber into a freezer.
In models with a system No Frost and electronic control, air sensors are responsible for the temperature. There may be several of them: one in the refrigerator compartment, another in the freezer, the third can control the temperature of the evaporator. If the sensor in the refrigerator compartment “lies” and shows that there is +10 degrees, although it is really +1, the controller will command the compressor to continue working.
Diagnostics of a mechanical thermostat is possible at home, but requires caution. It is necessary to remove the regulator, disconnect the contacts and check them by “continuity” at different temperatures of the sensing element (thermostat tube). Electronic sensors are checked with a multimeter for changes in resistance when heating or cooling.
Symptoms of a faulty sensor
If the refrigerator freezes but does not turn off for hours, and the sensor still shows a normal temperature on the display (or an error code), most likely it requires replacement.
Replacement of these components requires partial disassembly of the housing. In some models Samsung or Atlant the sensor may be hidden behind a plastic panel on the back wall. It is important to use original spare parts or complete analogues, since the resistance characteristics of different models may differ.
Problems with the seal and chamber tightness
Paradoxically, chamber leakage can also lead to excessive cooling of products, although more often this causes the formation of ice. If sealing rubber the door does not fit tightly, warm, moist air constantly enters the chamber. The control system detects the temperature rise and turns on the compressor for a long operating cycle to compensate for the heat gain.
As a result, the compressor simply does not have time to turn off. Products placed closer to the back wall or on the upper shelves are exposed to a direct flow of cold air and freeze. You can check the tightness with a simple test with a sheet of paper: hold the sheet with the door and try to pull it out. If the paper slides out without resistance, the seal requires replacement or adjustment.
Often the reason lies in dirty rubber or misaligned door hinges. Grease and sticky food debris prevent the rubber from adhering tightly to the metal of the case. Also, the hinges may sag over time, especially if the refrigerator is often and tightly clogged with heavy products.
- 🧼 Wash the seal thoroughly with warm water and soap, removing all grease.
- 🔧 Check the horizontal installation of the refrigerator using a level.
- 🚪 Adjust the legs refrigerator so that the door closes under its own weight.
- 🌡️ Make sure that the food does not interfere with the door closing tightly.
Clogging capillary pipeline and freon leak
More serious technical problems are associated with the refrigeration circuit. If a blockage has formed in the refrigerant circulation system (freon) (for example, an ice plug or a piece of oxide), gas circulation is disrupted. This can lead to uneven cooling: one part of the evaporator will be very cold, and the other will be warm.
However, if the refrigerator begins to freeze more than usual, this is often due to a freon leak under certain conditions or improper operation switching valve in two-compressor models. With a partial leak, the compressor may work longer, trying to gain temperature, but the “super-cooling” effect is more often characteristic of the problems with thermoregulation described above.
It is impossible to independently diagnose the condition of the freon circuit without a pressure gauge station. If you hear gurgling, hissing, or see oily spots on the rear grille, these are signs of depressurization. In this case, you need to call a technician to look for leaks, solder and refill.
| Symptom | Probable cause | Action |
|---|---|---|
| The compressor hums continuously | Thermostat or sensor is faulty | Replacing the temperature sensor |
| Ice only at the back wall | Direct air flow or blockage | Check ventilation and defrosting |
| Frost around the entire perimeter | The door seal is broken | Replacing the seal |
| The refrigerator turns off, but does not freeze | Freon leak | Searching for leaks and refueling |
Features of the No Frost system
In refrigerators with a system No Frost cold air is pumped by a fan from the freezer into the refrigerator through special air ducts. If the damper that regulates the flow of this air is stuck open, too much cold air is entering the refrigerator compartment.
The damper can be controlled mechanically (by a cable) or electronically (by a motor). In electronic systems, a failure in the control board can cause the damper motor to not receive a signal to close. As a result, the temperature in the main chamber drops to negative values, especially on the shelves located next to the air duct outlet.
It is also worth checking the evaporator defrost system. If the defrost heating element is burned out or the defrost timer is faulty, the evaporator becomes covered with ice. The fan begins to drive this icy air into the chamber, which can lead to local hypothermia of the products, although the global temperature may even rise.
☑️ Diagnostics No Frost
To access the damper and evaporator in most models LG, Indesit and others, you need to remove the back panel inside the refrigerator compartment. Be careful with plastic fasteners, which become brittle in the cold.
The influence of the external environment and the location of products
Do not forget about external factors. If your refrigerator is located next to a radiator, in direct sunlight, or in a very hot room, its thermostat may not work correctly, trying to compensate for external heat. However, more often this leads to the fact that the refrigerator stops cooling altogether, but in transient modes failures are possible.
How you place the food is also important. If you put warm food in the freezer, or pack the refrigerator full, cutting off air circulation, the sensors may read incorrect data. It is especially critical to block the ventilation holes inside the chamber.
The seasonal factor also plays a role. In winter, if the refrigerator is standing on an unheated balcony or in a cold hallway, the oil in the compressor may thicken, and the sensors “think” that it is already cold in the chamber, although due to inertia the system may behave unpredictably. Most refrigerators are not designed to operate at ambient temperatures below +10 degrees.
⚠️ Attention: Installing the refrigerator near heating appliances or in direct sunlight disrupts heat transfer and may cause the thermostat to operate incorrectly.
Is it possible to adjust the temperature in winter?
Yes, but if the room is colder than +10°C, the refrigerator may not turn on or work intermittently. Some models have a “winter mode,” but it only warms up the thermostat zone.
Frequently asked questions (FAQ)
Why does the refrigerator freeze only on the top shelf?
This is a classic sign that cold air falls from top to bottom (in models without No Frost) or blows directly from the duct (in No Frost). Check if the ventilation is blocked by food, and make sure that the thermostat is not set to maximum.
Is it possible to replace the thermostat yourself?
Technically, this is possible if you have skills in working with electricians and tools. However, in some models this requires defrosting the system or opening the foamed parts of the case, which is best left to a professional.
What to do if the problem remains after defrosting?
If complete defrosting (for 24 hours) did not help, then the problem is of a technical nature: the sensor, thermostat or damper is faulty. It is necessary to carry out diagnostics with a multimeter.
Why did the refrigerator start to freeze more after replacing the seal?
Perhaps the new seal fits too tightly, or you accidentally reset the thermostat settings during replacement. Also check if you have bent the air ducts when installing new rubber.
How often do you need to change the freon in the refrigerator?
Freon is a working fluid that circulates in a closed circuit. It no need change or top up during operation if the system is sealed. If the freon is gone, then there is a leak that needs to be fixed before refueling.