The situation when you open the refrigerator door, and there is room temperature, always causes panic. The products begin to deteriorate, and there is an urgent need to urgently find out the cause of the breakdown. Failure of the cooling system can be caused by many factors: from a banal blockage in the drainage system to a serious refrigerant leak.
Before calling a technician or looking for a new unit, it is necessary to conduct an initial diagnosis. Often the problem lies in simple things that you can fix yourself in a matter of minutes. However, ignoring alarming symptoms can lead to the failure of an expensive compressor, the replacement of which is comparable to the cost of a new device. In this article we will analyze in detail all the possible reasons why, and draw up a step-by-step action plan. You will learn to distinguish software failures from mechanical damage and understand in which cases DIY repairs are still possible, and when the intervention of professionals with vacuum equipment is required. compressor, the replacement of which is comparable to the cost of a new device.
In this article we will analyze in detail all the possible reasons why The refrigerator does not freeze, and draw up a step-by-step action plan. You will learn to distinguish software failures from mechanical damage and understand in which cases DIY repairs are still possible, and when the intervention of professionals with vacuum equipment is required.
Primary diagnosis: simple causes of failure
The most common mistake of owners is panic and hasty conclusions about a serious breakdown. In 30% of cases, the unit is operational, but does not work correctly due to violation of operating conditions. Check whether it fits snugly sealing rubber along the perimeter of the door. If the magnetic tape is worn out or dirty, warm air enters the chamber, and the equipment does not have time to cool it.
It is also worth paying attention to the location of the unit. If the refrigerator is located close to the wall or furniture, the air circulation around condenseris disrupted. This leads to overheating of the system and forced shutdown of the compressor. Make sure that the gap between the back wall and the wall is at least 5-7 centimeters.
It is important to check the temperature settings. Sometimes children or pets can accidentally change the settings by switching the controller to the "Vacation" or minimum cooling mode. In models with electronic control, the failure could have occurred due to a power surge in the network.
⚠️ Attention: If you notice that the motor is humming, but does not start, or starting occurs with a characteristic click and immediately stops, immediately disconnect the device from the network. Operation in this mode can damage the motor windings.
Do not forget about the defrosting mode. In older models with manual defrosting, a thick layer of ice on the walls acts as a heat insulator, interfering with normal heat transfer. In the systems No Frost the drainage could become clogged, and the water began to freeze inside the case, blocking the operation of the fans.
Faults in the thermostat and temperature sensors
One of the key parts responsible for maintaining the climate inside the chambers is thermostat (in mechanical models) or temperature sensor (electronic). It is this element that commands the compressor to turn on when the temperature rises above the set temperature. If it is faulty, the “brain” of the refrigerator simply does not receive a signal that it has become warm.
In mechanical thermostats, the contacts often oxidize or the bellows tube filled with freon bursts. As a result, the circuit does not close and the motor-compressor does not start at all. In electronic models, the problem may lie in an open circuit of the sensor itself or in a malfunction of the control module, which stops reading readings.
Diagnostics of the thermostat is possible at home if you have a multimeter. It is necessary to “ring” the contacts in cold and warm states. If the device shows a break in both cases or, conversely, a short circuit, the part requires replacement. This is a relatively inexpensive component that can be easily found in parts stores.
How to check a thermostat without a multimeter?
Remove the thermostat and immerse its sensitive tube in cold water with ice for 2-3 minutes. Then call your contacts. If there is no click or change in readings, the part is faulty. Be careful with water and electricity!>
Symptoms of a thermostat failure are often similar to other malfunctions, so it is important to conduct a comprehensive check. If the compressor runs constantly without turning off, and “snow” has formed in the chambers, this may also indicate “sticking” of the thermostat contacts in the “on” position.
Problems with the compressor and start relay
The heart of any refrigerator is compressor. If it doesn't start, there won't be any cold anywhere. Often the culprit of the failure is not the motor itself, but starting relay the device responsible for starting the engine. Inside the relay there is a coil and contacts that can burn or stick over time.
You can determine the malfunction of the relay by a characteristic sound: a click is heard, the motor tries to hum, but then a second shutdown click is heard, and there is silence. In such a situation, replacing the relay often solves the problem. This is an inexpensive part that you can replace yourself if you have electrical skills.
A more serious situation is a breakdown of the compressor itself. This may be an interturn short circuit of the windings or mechanical wear of the piston group. If the windings are “broken,” the compressor may hum, heat up and knock out the automatic fuses in the panel. In this case, a professional replacement of the unit with refilling the system with freon is required.
☑️ Diagnostics of the compressor unit
The latter operate smoothly, without sudden starts, and are diagnosed differently. To check the inverter module, special test equipment is often required, which is only available in service centers.
Freon leak and capillary tube clogged
If the motor is working properly, humming continuously, but there is no cold or it is very weak, most likely the problem is in the refrigerant. Freon circulating along a closed circuit, and if the tightness is broken, the gas escapes. A leak can occur anywhere: in a foamed circuit, in the evaporator or at soldering points.
Another common problem is clogging of the capillary tube. This is a very thin copper tube in which freon is throttled. Over time, oil oxidation products or paraffin plugs may form in the system, which block the refrigerant flow. The pressure in the system drops and cooling stops.
It is impossible to eliminate the leak or blockage on your own, since this requires:
1. Finding the location of damage (often using a leak detector).
2. Opening the foam layer of the case.
3. Soldering tubes in a nitrogen protective environment.
4. Evacuate the system and accurately charge with freon.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| Compressor is hot, but cold | Clogger capillary system | Blowing with nitrogen, replacing the filter-drier |
| The motor runs non-stop | Freon leakage | Searching for leaks, soldering, refilling |
| The evaporator is covered with uneven frost | Partial leak or blockage | Diagnostics of pressure in the circuit |
| The condenser (rear grille) is cold | Lack of freon in system | Urgent call for a technician |
⚠️ Attention: Freon is a gas that can be dangerous under certain conditions. Do not attempt to open the circuit yourself or burn remaining gas. Entrust this work to licensed specialists.
Failures in the No Frost system and evaporator defects
In refrigerators with the system No Frost fans are responsible for circulating cold air. If the fan stops due to a motor failure or frozen blades, the cold stops flowing into the chambers, although the evaporator may be icy. This is often accompanied by the absence of the characteristic noise of the fan.
Another critical detail is Defrost heating element. In defrost mode, it heats the evaporator to melt frozen ice. If the heating element burns out, the ice does not melt, a “fur coat” grows and eventually blocks the air channels. The refrigerator stops cooling, even if the compressor is working properly.
Also in the No Frost system, defrost sensors or a timer (electronic module) often fail. They may “think” that defrosting is already underway or, conversely, never turn on the defrosting mode. Diagnosis of these elements requires disassembling the rear panel of the freezer and checking the circuits with a multimeter.
In some models, there is a manufacturing defect or wear. evaporator. Aluminum tubes can corrode, especially if they are damaged with a knife during careless defrosting. Freon escapes through microcracks and the system stops functioning. Restoring the evaporator is a complex process, often requiring the installation of an external circuit.
Frequently asked questions and answers (FAQ)
Why does the refrigerator freeze only in the freezer, while it is warm in the main chamber?
This is a classic sign of a malfunction of the defrost system in No Frost models. Ice has clogged the channels through which cold air should flow from the freezer to the refrigerator compartment. Also, the reason may be a loose fit of the door of the main chamber or a breakdown of the damper that regulates the air flow.
How long does it take the refrigerator to gain temperature after defrosting?
Usually the process of reaching operating mode takes from 2 to 6 hours, depending on the volume of the chambers and the ambient temperature in the room. If, 8-10 hours after switching on, the compressor works, but the temperature does not drop, then there is a technical malfunction.
Is it possible to use a refrigerator if it does not freeze well?
For a short time - yes, but food can spoil. However, constantly running the compressor in an attempt to reach the set temperature will lead to overheating and rapid wear. It is better to identify the cause of poor cooling immediately.
What to do if after a power surge the refrigerator stops turning on?
Check the fuses in the house. If everything is in order with the electrics, the control module or start relay may have burned out. In modern models with electronics, a power surge often disables the control board, which requires its flashing or replacement.
Why, after replacing the freon, did the refrigerator stop freezing again after a month?
This indicates that the technician did not find and fix the leak, but simply added gas. Freon circulates in a closed circuit and cannot “end” on its own. It is necessary to look for a fistula in the system (often in the foamed part or evaporator) and seal it.