The situation when an ice crust suddenly forms in the main compartment of the refrigerator and food freezes is familiar to many owners of household appliances. Instead of fresh vegetables and chilled meat, you find solid blocks of ice, which indicates a serious violation of the temperature regime. Hypothermia It may occur suddenly or develop gradually, but this symptom cannot be ignored, as it often indicates a malfunction of important components of the unit.
Before you panic and call a technician, it is necessary to carry out primary diagnosis. Often the reason lies not in a breakdown of the electronics or compressor, but in a simple operating error or settings failure. Understanding the operating principles of No Frost and static cooling systems will help you quickly isolate the problem. In this article we will analyze in detail the mechanical and electrical causes of excess cold.
It is important to note that prolonged exposure of products at temperatures below normal can spoil their structure and taste. If you notice that the refrigerator has started to work in increased mode without interruptions, you must immediately check the settings and condition of the seals. Below we will look at the main factors influencing the operation of the sensors. refrigerant circulation and the operation of sensors.
Checking the temperature settings
The most common and easily eliminated reason that the refrigerator began to freeze too much is accidentally changed settings. In models with electronic control, one careless touch of the panel is enough to reset the mode to the minimum temperature. In refrigerators with mechanical controls, the thermostat may have shifted due to vibration or when loading food.
You need to open the instructions for your model Indesit, Atlant or Bosch and check the current values. For the main compartment, a normal temperature is considered to be in the range from +2 to +5 degrees Celsius. If the control is set to maximum (usually indicated by the number 7 or the word "Max"), the compressor will work continuously, trying to achieve unattainable cold.
⚠️ Attention: Some refrigerator models have a "Super Freeze" or "Quick Cool" mode. If you activated this function to quickly cool a large volume of food and forgot to turn it off, the camera will work at its maximum capacity.
It is also worth paying attention to the seasonal settings, if they are provided for by the design. In winter, when the room temperature drops, the thermostat takes less time to turn off the compressor, but if the room is hot and the settings are left at "winter", this may cause problems. Check the position of the slider or the value on the display.
Malfunctions of the thermostat and sensors
If the settings are normal, but the refrigerator continues to turn food into ice, most likely it has failed thermostat (thermostat). This device is responsible for closing and opening the compressor power circuit depending on the temperature in the chamber. When the thermostat “sticks” in the “on” position, the motor does not receive a signal to stop.
In modern models with the system No Frost electronic sensors (thermistors) monitor the temperature. Over time, their resistance may change, and they begin to transmit incorrect data to the control module that the chamber is too warm. Receiving a false signal, the control board continues to drive the compressor.
Diagnostics of the thermostat requires a multimeter. When the sensing element warms up or cools down, the contacts should click, changing resistance. If there is no click or resistance does not change, the part requires replacement. In electronic models, the sensor itself often fails, not the board.
How to check a thermostat with a multimeter?
To check, you need to remove the terminals from the thermostat and put the multimeter in dial mode. At room temperature the contacts should be closed (beeping). If you place the sensor in the freezer, the circuit should open after some time.
Symptoms of a thermostat failure are often accompanied by the fact that the refrigerator runs non-stop, and the back wall is covered with a thick layer of snow or ice. In this case, defrost cycle does not start, since the system “thinks” that the heat has not yet been gained.
Problems with the door seal
The tightness of the refrigerator compartment is a critical parameter for proper operation. If the rubber seal on the door is worn out, cracked or simply dirty, warm, moist air from the room constantly enters the chamber. Reacting to the increase in temperature, the automation makes the compressor work harder.
The moisture contained in the incoming air settles on the coldest surfaces (usually the back wall or the area around the evaporator), turning into frost and ice. Over time, the layer of ice grows, and the temperature in the chamber drops below normal, since the ice crust begins to work as an additional cooler, and the sensors do not have time to respond correctly.
A leak test can be done with a simple test with a sheet of paper. Clamp the sheet between the door and the body around the entire perimeter. If the paper comes out easily, without resistance, it means that the seal does not fit in this place. Also inspect the rubber for cracks, dents or peeling from the plastic.
☑️ Checking the seal
Often the problem is solved by thoroughly washing the seal with warm water and soap, since grease and sticky stains interfere with a tight fit. If the rubber has become stiff over time, you can try to gently warm it with a hair dryer to restore elasticity, but this is a temporary measure.
Freon leakage and compressor operation
Paradoxically, one of the reasons for severe freezing may be refrigerant leak. When there is little freon in the system, the compressor is forced to work almost non-stop, trying to reach the set temperature. In this case, cold is produced, but distributed unevenly.
In two-chamber refrigerators with one compressor, when there is a shortage of freon, the evaporator located in the freezer compartment or behind the back wall of the main compartment freezes first. Excess cold can “spread” into the main chamber, freezing food, while the compressor itself hums continuously.
Signs of a freon leak:
- 🧊 The compressor works around the clock, without turning off even at night.
- 🔥 Condenser (grid at the back or side walls) remains cold or warm only partially.
- 📉 The temperature in the freezer drops to extreme values, and in the refrigerator compartment can be unstable.
- 🔊 The appearance of gurgling or hissing sounds when the unit is operating.
It is impossible to eliminate the leak on your own, since how to find the location of damage, soldering and refilling the system with professional equipment. However, the user can and should diagnose indirect signs in order not to waste time on useless defrosting.
| Symptom | Probable cause | Nature of compressor operation |
|---|---|---|
| Ice only at the back wall | The defrosting heating element or timer is faulty | Cyclic (as usual) |
| Ice throughout the entire volume, food is freezing | Thermostat or sensor failure | Continuous |
| Ice in the corners, the compressor hums constantly | Freon leak or blockage | Continuous, with overheating |
| Ice around the door | Problem with the seal | Increased |
Failure of the defrost system (for No Frost)
In refrigerator systems No Frost the main heat exchanger (evaporator) is hidden behind a plastic panel. It must be thawed periodically so that ice does not interfere with air circulation. A defrost system is responsible for this process, including a heating element, a timer (or electronic module) and a defrost sensor.
If one of the elements of this chain fails, for example, burns out Defrost heating element or the sensor gets stuck, the ice stops melting and builds up on the evaporator. The air stops circulating normally and the cold flow can be directed directly at the food, causing it to freeze. Often, the fan begins to make noise, touching the frozen ice with its blades.
It is difficult to visually determine this problem, since the evaporator is closed. However, an indirect sign is that the refrigerator is freezing, but the on/off cycles may be disrupted. Sometimes a “beard” of ice appears on the back wall inside the chamber, which grows from the technological hole.
To diagnose the defrost system, you will need to “ring” the heating element and sensors with a multimeter for a break. Most often, low-quality water contains impurities that accelerate the corrosion of the heating element, disabling it within 3-5 years of operation.
Clogged capillary tube
The capillary tube is a thin copper channel through which the refrigerant enters the evaporator. If freon circulation system is formed clogging (often this is an ice plug from moisture or oil oxidation products), the permeability of the tube is disrupted.
When a blockage occurs, the pressure in the system drops, and freon can freeze right at the exit point from the capillary, forming an ice coat. This leads to the fact that at the beginning of the cooling cycle the cold is very intense, but quickly ends, or, conversely, the system operates in emergency mode. In some cases, this causes local severe freezing of the evaporator area.
It is extremely difficult to diagnose a blockage at home. This is usually accompanied by a change in the sound of the compressor (a duller hum) and the absence of the characteristic noise of flowing freon. If after defrosting the problem returns after a few days, and the thermostat is working, there is a high probability of problems with the capillary.
⚠️ Attention: Under no circumstances try to clean the capillary tube yourself by piercing it or applying air under pressure. This will lead to depressurization of the system and final breakdown of the refrigerator.
Frequently asked questions and answers (FAQ)
Why did the refrigerator start to freeze strongly again after defrosting?
If you defrosted the unit (kept it turned off for 24 hours) and it started to freeze again, then the reason is not frozen ice, but in a faulty unit. Most likely, the problem is in the thermostat, which does not turn off the compressor, or in the temperature sensor. The ice plug in the capillary could also melt, but the problem with circulation remained.
Can a refrigerator get very cold in the summer?
Yes, in the summer the load on the compressor increases due to the high temperature in the room. If the room is hot and you haven’t changed the settings (for example, you haven’t turned on summer mode or turned down the power), the refrigerator will work hard. Also, in summer, power surges occur more often, which can damage the control electronics.
What to do if the food is frozen, but the settings are normal?
It is necessary to exclude mechanical causes: check the tightness of the door and the cleanliness of the seal. If the door is fine, the thermostat most likely needs to be replaced. Before the technician arrives, you can set the regulator to the minimum value (1 or Min) in order to somehow stabilize the temperature.
How to understand that the thermostat is broken?
The main sign is that the compressor works non-stop, even when the chamber is already very cold. If you forcibly unplug the refrigerator, wait 15 minutes and turn it on again, it may work, but after a while the cycle will repeat. An accurate diagnosis is made only after checking the contacts with a multimeter.