The situation when food in the main chamber turns into ice blocks and vegetables freeze is familiar to many owners of household appliances. Instead of freshness, you find frost on the shelves and spoiled supplies. This is a sure sign that the refrigerator works like a freezer, violating the temperature regime. Such a malfunction requires immediate intervention, since operation of the unit in emergency mode can lead to failure of the compressor.
Most often, the problem lies in a failure of the control system or a refrigerant leak. Modern models Indesit, Atlant or Beko equipped with complex electronics that can malfunction during power surges. However, you should not immediately panic and call a specialist, since in some cases the cause can be eliminated yourself by checking the settings and position of the products.
In this article we will analyze in detail the mechanics of the cooling process, identify the main symptom is continuous operation of the compressor without shutting down and propose an algorithm of actions. Understanding the principles of operation of the refrigeration circuit will help you quickly diagnose a breakdown and avoid costly repairs in the future.
The main reasons for the violation of the temperature regime
The fundamental reason that the refrigerator freezesis the imbalance between production of cold and its distribution. In a working unit, the refrigerant circulates through the system, taking heat from the chambers and releasing it to the environment through the condenser. If this cycle goes wrong, the temperature drops below acceptable values.
One of the common reasons is a freon leak. It may seem paradoxical, but if there is a shortage of refrigerant, the compressor starts working non-stop, trying to reach the set temperature. As a result, a “snow coat” forms in the freezer compartment, and in the main compartment, the food is covered with a crust of ice. This is a classic example of how failure of the sealing system leads to excessive energy consumption and spoilage of products.
It is also worth considering the human factor. Often, users accidentally set the thermostat to minimum values or turn on the “Super Freeze” mode, forgetting to turn it off. In models with electronic control, a failure in the control board may be perceived by the system as a signal for emergency cooling.
Problems with the thermostat and temperature sensors
The thermostat (or thermostat) is the “brains” that tells the compressor when to turn on and when to rest. If this device fails, it can constantly send a signal that the chamber is warm, causing the motor to work harder. In older models Stinol or Biryusa this is often a mechanical breakdown of the capillary tube.
In modern No Frost systems, air sensors monitor the temperature. Their task is to read readings and transmit them to the control module. If the sensor is “lying” or its contacts are oxidized, the refrigerator does not receive a command to stop. Replacing such an element requires disassembling the internal panel and having a multimeter to check the resistance.
- 🔧 Mechanical thermostat: checked by checking the contacts when the temperature of the sensitive element changes.
- 🌡️ Air sensor: requires checking the resistance, which should change smoothly when heating or cooling.
- 📟 Electronic module: may incorrectly process signals from working sensors due to a power surge.
⚠️ Attention: Before replacing the thermostat, be sure to disconnect the refrigerator from the power supply. Working with electrical components in a damp environment is unacceptable.
☑️ Thermostat diagnostics
Faults in the No Frost system and fan
The system No Frost ("No frost") involves forced circulation of cold air. A fan located behind the back wall of the freezer is responsible for this process. If the fan stops due to icing or motor failure, the cold ceases to be distributed evenly.
As a result, a powerful ice lump forms in the evaporator area (usually the back wall of the freezer), and in the main chamber the temperature can either increase or, under certain circulation conditions, drop to critical values due to the lack of heat exchange. The defrost sensor may also fail, which does not give the command to defrost the evaporator.
Often users are faced with a situation where after defrosting the refrigerator starts working normally, but after a few days the problem returns. This indicates that defrost system is not functioning correctly. The heating element of the heater may be burnt out, or the defrost timer is “stuck” in operating mode.
How to check the No Frost fan?
To check, remove the back panel in the freezer. When the refrigerator is turned on, the fan should be running. If it stops, but voltage is supplied to it, the motor is faulty. If there is no voltage, the problem is in the control circuit.
Refrigerant leak and problems with the compressor
Freon leak is one of the most difficult problems. The refrigerant circulates in a sealed circuit, and failure to seal it leads to loss of cooling capacity. As mentioned earlier, the compressor tries to compensate for the lack of cold by working continuously. It is difficult to determine a leak visually; it often occurs in foamed parts of the housing or in solder joints.
A compressor can also be the culprit of freezing if its internal mechanics or valve group are damaged. In this case, it may not create enough pressure, but consume a lot of energy. However, more often, if the compressor breaks down, the refrigerator, on the contrary, stops cooling altogether.
To diagnose the freon level, a pressure gauge station is required. The technician connects the device to the service fitting and checks the pressure in the system. If the pressure is below normal, a leak is searched for using a leak detector or soap solution, after which the system is sealed and refilled.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The compressor hums, but not starts | The starting relay is faulty or the motor is jammed | Medium |
| The refrigerator runs without stopping | Freon leakage or thermostat failure | High / Low |
| Ice only on the back wall | No Frost system malfunction | Medium |
| Food frozen at the back wall | Incorrect installation or contact with wall | Low |
Influence of settings and external factors
Before disassembling the equipment, exclude external factors. Room temperature plays an important role. If the refrigerator is located next to a radiator, stove, or in direct sunlight, the sensors may not work correctly. It is also important to check the tightness of the sealing rubber on the doors sealing rubber If the rubber is dry or dirty, warm air enters the chamber. The refrigerator reacts to this by increasing its operating power, which can lead to local hypothermia in the areas where the cold flow exits. Regularly washing the seal with warm water helps prolong its life.
If the gum becomes dry or dirty, warm air enters the chamber. The refrigerator reacts to this by increasing its operating power, which can lead to local hypothermia in the areas where the cold flow exits. Regularly washing the seal with warm water helps prolong its life.
In models with electronic control, it is worth checking the settings. Sometimes children or accidental touch can activate the fast freeze mode. The corresponding indicator (snowflake or letter F) usually lights up on the display. Disabling this mode returns the normal operating cycle.
Self-diagnosis algorithm
If you decide to carry out diagnostics yourself, proceed consistently. First, a visual inspection: is there any distortion in the door, is the rubber band intact, is the temperature set correctly. Then listen to the operation of the unit: are there any extraneous sounds, cyclical switching on.
Next you can conduct a defrost test. Defrost the refrigerator completely (at least 12 hours). If after turning it on it worked normally, but after a week the problem returned, look for the cause in the defrost system or a leak. If immediately after turning on it starts to freeze excessively, check the thermostat.
- ❄️ Step 1: Complete defrosting within 24 hours.
- 🔌 Step 2: Checking the integrity of the power cable and socket.
- 🌡️ Step 3: Setting the thermostat to the average value.
- 👂 Step 4: Listening to the operation of the compressor and fans.
⚠️ Attention: If you smell a burnt wiring or see sparking, immediately stop diagnostics and disconnect the device from the network. Further repairs should only be carried out by a qualified specialist.
Frequently asked questions (FAQ)
Why does water freeze in the refrigerator, but everything is fine in the freezer?
This may indicate that the cold air supply channel from the freezer to the main compartment is clogged, or is faulty damper regulator. It is also possible that the food in the main chamber lies too close to the air duct opening.
Is it possible to operate the refrigerator if it gets very cold?
For a short time - yes, but you can’t do this for a long time. Constant operation of the compressor without rest cycles will lead to overheating and burnout of the windings. In addition, you risk losing all the products.
How much does it cost to replace a thermostat?
The cost consists of the price of the part and the work of the technician. On average, replacing a thermostat is cheaper than refilling with freon or repairing a compressor. It is better to check the exact price at service centers in your city.
Does the quantity of food affect the temperature?
Yes, it does. An empty refrigerator operates differently than a fully loaded one. Products serve as cold accumulators. If there are almost no cameras, the temperature may fluctuate more sharply, but usually this does not lead to severe freezing if the equipment is working properly.