Sudden failure of household appliances always becomes an unpleasant surprise, especially if a large supply of products is stored in the chambers. Refrigerator breakdown can be caused by many factors: from a banal power surge to complex mechanical wear of internal components. Owners are often faced with a situation where the compressor is silent, the unit makes unnatural sounds, or ceases to maintain the set temperature.
Understanding the nature of the malfunction is the first step to successfully restoring the operation of the device. Many users mistakenly believe that the lack of cold always means the compressor is failing, but statistics from service centers indicate the opposite. Quite often, the problem lies in a violation of the tightness of the system, a clogged capillary tube, or a malfunction in the electronic control unit.
In this article we will analyze in detail the most common accident scenarios. We will look at both simple cases that you can fix yourself, and complex technical problems that require the intervention of a qualified technician. It is important to learn to distinguish between symptoms so as not to aggravate the situation with incorrect actions.
Tightness failure and refrigerant leak
One of the most common reasons the refrigerator stops freezingis a freon leak. The refrigerant circulates in a closed circuit, and if its integrity is violated, the pressure in the system drops. Without a sufficient amount of working fluid, heat exchange is impossible, and the temperature in the chambers begins to rise to room temperature.
Leaks often occur in places where pipes are soldered or in the evaporator. If you use sharp objects to defrost ice, the risk of damaging the thin walls of the evaporator is very high. Also, metal corrosion over time can lead to the formation of microcracks, especially in models operated in conditions of high humidity.
⚠️ Attention: Freon is a gas that is odorless and colorless. If you hear hissing or see an oily spot under the refrigerator, this is a sure sign of depressurization of the system.
Diagnostics of a leak requires special equipment. The technician connects the pressure gauge station and checks the pressure in the circuit. If it is below normal, a leak is searched using a leak detector or soap solution. After detecting a defect, the tubes are sealed, the system is evacuated and refilled with a new portion of gas.
It is important to understand that simple refueling without eliminating the cause of the leak will not give a long-term result. Circuit tightness is a fundamental requirement for the operation of any refrigeration machine. Ignoring this rule will lead to repeated breakdown and combustion of the compressor due to idle operation.
Is it possible to refuel the refrigerator yourself?
Self-refueling is highly not recommended. This requires a vacuum pump, a scale for precise gas dosing, and skills in soldering copper pipes. Incorrect refueling can lead to a compressor explosion or complete system failure.
Failures of the compressor and start relay
The compressor is often called the “heart” of the refrigerator, and its breakdown is the most expensive problem. This unit is responsible for compression and circulation of the refrigerant. If you hear the motor trying to start, making a clicking sound and immediately stopping, the problem most likely lies in the start relay or the motor itself.
The start relay is a small element that provides an impulse to start the motor windings. It often fails due to power surges. Replacing a relay is a simple procedure that you can do yourself if you have basic tool skills. However, if after replacing the relay the situation does not change, the issue may be a break or inter-turn short circuit in the compressor windings.
Overheating of the motor can also cause a stop. Modern models have a thermal protection relay that opens the circuit at critical temperatures. If the refrigerator is installed close to a wall or in a niche without ventilation, heat transfer is disrupted and the protection is triggered.
- 🔊 Humming without starting: characteristic sound of an engine that cannot turn the piston group.
- ⚡ Knocks out plugs: short circuit in the windings or faulty wiring.
- 🔥 Housing heating: The compressor is overloaded or jammed.
To diagnose the condition of the compressor, technicians use a multimeter to test the windings and measure the resistance. Normal resistance values depend on the engine model, but the absence of resistance or an “infinity” reading indicates a malfunction. In such cases, it is required replacement of the compressorwhich is a complex technical procedure.
Clogged capillary tube and filtration system
The capillary tube is a thin channel connecting the condenser and the evaporator. It is here that a sharp drop in refrigerant pressure occurs, which leads to its boiling and heat absorption. The diameter of this channel is extremely small, so it is sensitive to any contamination.
The main cause of blockage is moisture that has entered the system. Water can penetrate there if the repair is poor or the seal is broken. In a narrow place in the tube, moisture freezes, forming an ice plug that blocks the circulation of freon. Also, a blockage can be caused by oil oxidation products or debris remaining after soldering.
Symptoms of a blockage often appear cyclically: the refrigerator freezes for a while, then stops, and the cycle repeats. This is due to the fact that the ice plug may periodically thaw as the system warms up. Another sign is a hot condenser and a cold evaporator, or vice versa, uneven heating along the length of the tubes.
Removing the blockage requires purging the system with nitrogen under high pressure. In some cases, it is necessary to replace the capillary tube and filter-drier. Filter-drier plays a key role in cleaning freon from moisture and mechanical impurities, so it is changed whenever the circuit is opened.
Problems with the defrost system (No Frost)
In refrigerators with the system No Frost a visible layer of ice does not form on the evaporator, since moisture is removed outside. However, ice still forms, but in a hidden space behind the back wall. To remove it, an automatic defrosting system is provided, consisting of a timer, heater and sensors.
If one of the elements of this chain fails, the evaporator becomes overgrown with a “fur coat”. Ice blocks the ventilation ducts, and cold air stops flowing into the chambers. As a result, it becomes warm in the main compartment, and in the freezer the temperature may be below normal or also increase.
Most often, the defrost heating element burns out or the defrosting sensor fails. The timer may become stuck in cooling mode without starting the defrost cycle. Diagnostics of these elements is carried out by testing the tester for circuit integrity.
It is important to distinguish a malfunction of the defrost system from problems with the fan. If the fan circulating air has stopped due to icing or breakdown, the effect will be similar - no cold in the chambers while the compressor is running.
☑️ Diagnostics of the No Frost system
Malfunctions of the thermostat and electronics
The operation of the refrigerator is controlled either by a mechanical thermostat or an electronic module. The thermostat (thermostat) measures the temperature in the chamber and gives a command to turn the compressor on or off. If its sensitive element (bellows) has lost its tightness or the calibration has shifted, the refrigerator may not turn on at all or work without stopping.
In models with electronic control, control moduleis responsible for all processes. It reads readings from various sensors and regulates the operation of the compressor, fans and defrost system. Electronics failures are often caused by power surges, moisture, or manufacturing defects.
Symptoms of electronics malfunction are varied: flashing indicators, lack of response to buttons, chaotic turning on and off of the unit. In some cases, the display may display error codes that help the technician quickly identify the culprit unit.
Replacing the thermostat is a relatively simple procedure. The electronic module requires more complex diagnostics and re-soldering of components or complete replacement of the board. It is important to use original spare parts or high-quality analogues, since cheap substitutes often do not work correctly.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| Does not turn on, no light | No power, cord burnt out | Low |
| Humming, but not freezing | Freon leak, clogged | High |
| Works without stops | Thermostat is faulty, leakage | Average |
| A lot of ice in the chamber | The defrost system does not work | Average |
⚠️ Attention: If your refrigerator is equipped with an inverter compressor, electronics diagnostics require a special tester. A regular test with a multimeter may not give an accurate result.
Mechanical damage and wear of seals
Not only internal components affect the operation of the refrigerator. Door seals (cuffs) ensure the tightness of the chambers. Over time, rubber loses elasticity, cracks or deforms. Warm, moist air enters the chamber through a loose door.
This leads to increased ice formation, increased load on the compressor and increased energy consumption. In chambers with poor sealing, food spoils faster and condensation forms on the walls. You can check the seal using a sheet of paper: hold it with the door and try to pull it out. If the paper is easily removed, the seal requires replacing or adjusting the hinges.
Mechanical damage may also affect the body. Dents on the back wall can damage the condenser, and misalignment of the door during transportation can disrupt the operation of the closing mechanism. It is also worth checking the door hinges: if they are loose, the door warps and does not fit tightly.
Regular care of the seals will extend their service life. Wipe them with a soft cloth and treat them with a special silicone lubricant so that the rubber does not dry out. Chamber tightness This is the key to energy efficiency and long-term operation of your refrigerator.
Why does the refrigerator make a loud noise after installation?
A strong hum in the first hours of operation may be associated with the compressor reaching operating mode or vibration of the tubes. Make sure the refrigerator is level and the legs are adjusted. If the humming does not go away after a day, the compressor may need to be attached or the fan checked.
Is it possible to turn on the refrigerator immediately after defrosting?
Yes, modern refrigerators can be turned on immediately after you have wiped off the water. However, if transportation or repairs were carried out, it is better to wait 2-4 hours so that the refrigerant and oil are distributed throughout the system.
What to do if water appears in the chamber?
Most often the drain hole becomes clogged. Try cleaning it with a special stick or soft wire. If water appears under the refrigerator, check the integrity of the condensate collection tray and the drain tube.