The situation when the refrigerator stops freezingalways takes you by surprise and threatens food damage. You open the door, and there is room temperature or, at best, barely perceptible coolness. At this moment, it is important not to panic, but to consistently analyze the operation of the unit. Primary diagnostics will help to understand the scale of the disaster: whether an urgent call to a technician is required or whether the problem can be solved independently by simply defrosting the chamber or cleaning the heat removal system.
Modern models, be it Indesit, Bosch or Atlant, are equipped with complex electronics and mechanical components, the failure of which leads to a stop in cooling. Often, owners notice the problem too late, when food has already begun to deteriorate, but the first signs could have been noticeable earlier: the refrigerator worked longer than usual, turned on more often, or made uncharacteristic sounds. Understanding the principles of operation of refrigerant and the compressor is necessary for a correct assessment of the situation.
In this article we will analyze in detail why The refrigerator does not freeze, which components most often fail and how to carry out initial diagnostics without expensive equipment. We will consider both simple everyday causes and complex technical malfunctions that require professional intervention.
Primary diagnostics: why the indicator does not light
Before looking for complex technical reasons, it is worth eliminating basic operating errors. It often happens that the unit is working properly, but its operating conditions are violated. For example, if the door is not closed tightly due to adhered ice or a foreign object, temperature mode it is broken, and the compressor runs in vain, not having time to cool the chamber volume.
Check the tightness of the fit rubber seal along the perimeter of the door. Over time, the rubber dries out, cracks or becomes deformed, allowing warm air to enter. A simple test with a sheet of paper will help identify problem areas: hold the sheet between the door and the body and try to pull it out. If the paper comes out too easily, the seal is broken.
⚠️ Attention: If you find that the seal is contaminated with grease or sticky food debris, be sure to wash it with warm water and soapy water. Dirt prevents a tight seal and causes the compressor to wear out.
It is also worth paying attention to the location of the products. If you load the camera full, blocking air ducts and the ventilation holes, cold air simply will not be able to circulate. In systems No Frost this is a critically important point, since the circulation of air flows there is forced and requires free space.
Problems with the thermostat and electronics
One of the common reasons for the lack of cold is a malfunction thermostat (thermostat). This unit is responsible for turning the compressor on and off depending on the temperature inside the chamber. If the thermostat is “stuck” in the “off” position or its temperature sensor is faulty, the compressor simply will not receive a command to start.
In modern models with electronic control, instead of a mechanical thermostat, there may be a temperature sensor (thermistor). Its breakdown often leads to the control module “thinking” that it is already cold in the chamber and does not start the cooling cycle. Diagnostics of such systems requires a multimeter to check the resistance of the sensor.
If you hear clicks, but the compressor does not start, or it runs continuously without turning off, the problem may lie in the control circuit. In some cases, temporarily closing the thermostat contacts to check the operation of the compressor helps, but this action requires caution and understanding of electrical circuits.
Mechanical thermostats are characterized by wear of the bellows tube, which is filled with freon. If gas leaks from this tube or is mechanically damaged, pressure is not transmitted to the contacts and the circuit does not close. Replacing the thermostat is a relatively inexpensive procedure and can often be solved at home if you have basic skills.
Faults of the compressor and start relay
The heart of the refrigerator is compressor. If it is silent, buzzes, but does not start, or starts for a couple of seconds and immediately stalls with a click, the problem lies in the motor or start-protection relay. The relay is necessary to supply a starting pulse to the motor winding; if it burns out, the compressor will not be able to start working.
Checking the relay often begins with a visual inspection: there is no carbon deposits, melted plastic or a burning smell. Shaking the relay next to your ear can also give a clue: if the inside rattles like a rattle, then the insides are damaged and the part needs to be replaced. This is a consumable material that can be changed quite easily.
☑️ Compressor diagnostics
A more serious situation when it compressor electric motor has an interturn short circuit or a wedge of the piston group. In this case, the refrigerator may hum, consume increased current, but not produce cold. Repairing such a unit is not economically feasible; it usually requires a complete replacement of the compressor, which is a complex and expensive procedure that requires evacuation of the system and refilling with freon.
It is important to note that if the compressor is hot and the refrigerator does not freeze, this may indicate that it is running “idle” due to the lack of refrigerant in the circuit or blockage of the capillary system. It is impossible to leave the unit in this state for a long time, as this leads to overheating and final failure of the motor.
Freon leakage and blockage of the capillary system
If the compressor operates continuously without turning off, but there is no cold or it is very weak, there is a high probability refrigerant leaks (of freon). Freon is a working fluid that circulates through the system, taking away heat. Without sufficient gas, heat exchange does not occur efficiently. Leaks often occur in places where pipes are soldered or due to corrosion of the evaporator, especially in models with a foamed circuit.
Another common cause is clogged capillary tube. Oil circulates in the system, which over time can thicken or mix with wear debris, forming a plug. Also, a plug can be created by moisture entering the system during poor repairs, which freezes in a narrow place in the capillary.
| Symptom | Possible cause | Nature of work compressor |
|---|---|---|
| The refrigerator is silent | Malfunction of the thermostat or relay | Won’t turn on |
| Buzzes and turns off | Compressor wedge or break windings | Works jerkily |
| Works without stopping | Freon leak or blockage | Continuous operation |
| Freezes only at the back wall | Fan malfunction (No Frost) | Cyclic |
Diagnostics of a leak requires special equipment - a leak detector or the use of a soap solution (although the latter method is effective only for large leaks and access to pipes). It is almost impossible to find a microcrack in a foamed housing on your own.
Why can’t you just add freon?
Simply refilling with freon without finding and eliminating the leak is a temporary measure. The gas will come out again through the same hole after a few days or weeks. In addition, air or moisture may remain in the system, which will lead to the formation of acid and combustion of the compressor.
Specific problems in No Frost refrigerators
Refrigerator systems No Frost ("without frost") have their own characteristics. In them, the cold is produced in a separate evaporator (usually hidden behind a plastic panel) and pumped into the chambers by a fan. If the refrigerator does not freezebut the compressor is humming, often the culprit is the fan or defrost system.
In the system No Frost the serviceability of Defrost heating elementthe timer or board is critical defrost. If the evaporator becomes covered with a “coat” of ice that does not thaw, the ice blocks the air supply channels. As a result, the fan drives air, but it does not pass through the heat exchanger, and there is heat in the chambers.
⚠️ Attention: In No Frost models, under no circumstances try to pick out the ice with a knife or sharp objects. You could puncture the aluminum evaporator, making repairs impossible or extremely expensive. Use only a hair dryer for gentle defrosting.
Check if the fan is spinning. Sometimes it becomes jammed with ice, or its electric motor fails. It’s also worth checking defrost sensor: if it “lies” and tells the board that the evaporator is warm when it is frozen, the defrost cycle will not start, and the ice will grow endlessly.
Often owners of such models are faced with the fact that there is cold in the freezer, and the refrigerator compartment is warm. This is a classic sign of an ice-clogged air passage between the chambers. In this case, the refrigerator must be completely defrosted within 24 hours with the doors open.
When professional repairs are needed
There are a number of malfunctions that it is better not to deal with on your own if you do not have specific skills and tools. Opening of the refrigeration circuit, soldering copper tubes, evacuation of the system and charging with refrigerant are works for certified craftsmen.
A qualified technician is needed if:
- 🔧 Replacement is required compressor (requires soldering and precise selection of oil).
- ❄️ A leak was detected in the foamed part of the housing (evaporator inside the wall).
- 💧 There was a “pop” and a burning smell appeared (the winding burned out).
- 🛠️ The filter-drier needs to be replaced (requires soldering).
An attempt to independently repair a sealed circuit often leads to moisture or air entering the system. This causes the formation of acids, which corrode the compressor windings from the inside, and after a short time the unit burns out completely. Saving on calling a technician in this case results in the purchase of a new refrigerator.
Frequently asked questions (FAQ)
Why does the refrigerator hum but not freeze?
This may indicate a freon leak, a clogged capillary system, or a malfunction start relay. The compressor is running, but the refrigerant is not circulating or compressing properly, so no heat exchange occurs.
How long does it take to defrost a No Frost refrigerator?
It takes a minimum of 24 hours for the hidden evaporator in a No Frost system to completely defrost. The standard 2-3 hours, which are recommended for drip systems, may not be sufficient here, since the ice is deep inside the housing.
Is it possible to use a refrigerator if it does not freeze well?
Using a unit with an abnormal temperature regime is dangerous for the products (risk of bacterial growth), and is also harmful for the compressor itself, which is operating under overload. It is better to eliminate the cause of the breakdown.
What to do if it is warm in the refrigerator compartment and cold in the freezer?
Most often this is a sign of a malfunction of the damper that regulates the supply of cold air from the freezer to the refrigerator compartment, or icing of the air duct. The damper needs to be defrosted or replaced.
How to understand that the compressor has burned out?
Symptoms: the refrigerator does not turn on, knocks out the plugs/circuit breakers in the panel, a loud click and buzzing sound is heard when starting, after which there is silence, or the compressor housing does not heat up when the motor is running (in case of a break chains).