A sudden stop in the operation of refrigeration equipment always takes you by surprise, because it threatens damage to a large supply of food. Fault diagnosis it begins with an analysis of external signs: the device may hum, but not cool, or, conversely, work absolutely silently. Understanding which components are subject to wear allows you to anticipate possible problems in advance and avoid costly repairs.
Statistics from service centers show that the lion's share of breakdowns occurs in the refrigerant circulation system and electrical control components. Owners often face a situation when the unit Indesit or Atlant stops freezing due to a banal blockage or freon leak. However, there are also more complex scenarios associated with the failure of an expensive compressor.
Timely identification of symptoms can save significant money. The most common reason for a complete stop is a refrigerant leak, which accounts for up to 40% of all calls to service. Next we will analyze in detail each structural element that can fail during operation.
Modern models, be it LG or Bosch, are equipped with complex electronics, which are also vulnerable to power surges in the network. Ignoring the first “bells”, such as periodic switching on and off or the appearance of ice, often leads to major repairs.
Compressor: the heart of the refrigeration system
The compressor is the main engine that circulates the refrigerant through the pipe system. It is he who creates the necessary pressure, thanks to which freon changes its state of aggregation, taking heat from the chambers. If this unit breaks down, the refrigerator turns into an ordinary cabinet, and food begins to deteriorate very quickly.
Most often, the electromechanical part of the motor fails or the winding breaks. In inverter models that can be found in technology Samsung and Haier, problems are often associated with the control board that regulates the speed of rotation of the shaft. Start relay is also a critical element that ensures the engine starts.
Signs of a compressor malfunction may vary. Sometimes the device makes a loud click and goes silent, trying to start again after a certain time. In other cases, the motor hums, but does not start, which indicates a jammed piston group or problems with the starting mechanism.
Why does the compressor burn out?
The main reason for overheating and burning of the compressor windings is poor-quality voltage in the network or a lack of refrigerant. If there is little freon in the system, the motor does not receive sufficient cooling and wears out, which leads to its premature failure.
It is worth noting that replacing a compressor is a labor-intensive process that requires evacuation of the system and refilling with new refrigerant. It is almost impossible to carry out this operation on your own without special equipment, so if you suspect a breakdown of the “heart” of the refrigerator, it is better to turn to professionals.
Defrosting and defrosting system
Modern refrigerators with the system No Frost have saved users from the need to regularly defrost the chambers manually. However, convenience comes at the price of complexity in the design, which includes heating elements, sensors and timers. What exactly breaks down most often in this system? The answer is simple: the heating element of the evaporator.
The heating element works cyclically, melting the ice that builds up on the evaporator while the compressor is operating. Over time, the heating element's coil burns out and the ice stops melting. This leads to fouling of the evaporator with a “fur coat”, which blocks the circulation of cold air. As a result, the chamber becomes warm, although the compressor continues to work non-stop.
In addition to the heating element, defrost sensors often fail. They monitor the temperature of the evaporator and tell the control unit when to turn on the heating and when to turn off. If the sensor is “lying,” the system may either not start defrosting at all, or heat for too long, which also leads to breakdowns.
Another element, One that is often forgotten is the capillary tube or drainage trough. If they become clogged with dirt or freeze, the melt water does not go into the pan, but flows out, forming a puddle under the refrigerator. Regular cleaning of the drainage hole helps to avoid this problem.
It is important to understand that ignoring defrosting problems can lead to more serious consequences. An ice block can damage the fan blades or even deform the plastic elements of the internal chamber.
Thermostats and temperature sensors
Thermostat (or thermostat) is a device that maintains a set temperature inside the chambers, turning the compressor on and off. In older models this is a mechanical device, in new ones it is an electronic sensor. If the refrigerator stops turning off or, conversely, does not turn on at all, this element is the first to blame.
Mechanical thermostats lose sensitivity over time. The capillary tube that senses temperature may become deformed or lose its seal. As a result, the contacts inside the regulator stick, and the compressor operates continuously, causing severe freezing of the products.
Electronic temperature sensors installed in refrigerators Electrolux or Candytransmit data to the main board. Their malfunction often manifests itself in the form of errors on the display or chaotic behavior of the equipment. Sensor resistance changes depending on the temperature, and if it goes outside the normal range, the control unit blocks the operation of the unit.
Replacing the thermostat is one of the simplest and most affordable repair procedures. However, it is important to choose an analogue with identical characteristics, otherwise the temperature regime will be disrupted. An incorrectly selected part can lead to frequent motor starts or insufficient cooling.
☑️ Thermostat diagnostics
Refrigerant leakage and system blockages
Refrigerant (freon) is the working fluid that transfers heat. In a working refrigerator, it circulates in a closed circuit for years. However, corrosion processes, vibrations or mechanical damage can disrupt the tightness of the system. Freon leakage is an insidious problem that develops gradually.
At first, you may notice that the refrigerator has become less freezing or the compressor has started to turn on more often. Then paint blisters (traces of corrosion) appear on the rear grille, and eventually cooling stops completely. Searching for leaks requires the use of a leak detector or soap solution, and also often involves disassembling the foamed parts of the case.
Along with leaks, blockages often occur capillary tube. Microscopic particles of debris that entered the system during assembly or formed as a result of oil decomposition clog the narrow section of the tube. Freon circulation stops and the refrigerator stops cooling, although the compressor is working properly.
To eliminate these problems, professional intervention is required: searching and soldering the leak, replacing the filter-drier, evacuation and refilling with new gas. It is impossible to eliminate a blockage or leak without equipment.
| Type of malfunction | Symptoms | Difficulty of repair | Required equipment |
|---|---|---|---|
| Freon leakage | Does not freeze, paint swelling, long motor operation | High | Leak detector, burner, pressure gauges |
| Capillary clogged | It is cold only at the compressor, condenser cold | Medium | Blowing press, nitrogen |
| Heating element malfunction | Ice in the freezer, heat in the refrigerator compartment | Low | Multimeter, screwdrivers |
| Compressor failure | Clicks, buzzing without starting, no cold | High | Soldering station, vacuum sealer |
Problems with seals and doors
It would seem that something could break in the door? However, it is the loose fit of the valves that causes many problems. Rubber seal over time loses elasticity, cracks or deforms. Warm, moist air penetrates into the chamber through the resulting cracks.
The result of this is intensive formation of ice, especially in the freezer. The compressor is forced to work almost non-stop, trying to compensate for the heat gain. This leads to its overheating and increased energy consumption.
In addition to the seal itself, door hinges or magnets may break. The door warps and the fit is broken even with the rubber band intact. In some models, for example, o Stinol or old ZIL, the hinges may simply rust and stop fixing the door in the open position.
You can check the tightness of the door in a simple way: hold a sheet of paper between the door and the body and try to pull it out. If the paper is removed easily without resistance, then the seal requires replacement or adjustment of the hinges.
Electronic control unit and wiring
In modern refrigerators, the “brain” is the electronic control module. It receives signals from sensors and controls the compressor, fans and heating elements. Power surges in the household network are the main enemy of electronics. Even a short-term surge can damage the sensitive elements of the board.
Symptoms of a control unit failure are varied: the refrigerator may not turn on, the indicators may blink randomly, display error codes, or not respond to the control panel buttons. In some cases, only part of the circuit, responsible, for example, for the display, burns out, and the refrigerator works, but does not show the temperature.
Contacts and wiring connectors also often oxidize, especially in conditions of high humidity. Wires can rub against moving parts or sharp edges of the housing. Open circuit leads to the fact that the signal simply does not reach the actuator.
Repairing an electronic module requires deep knowledge of radio engineering. It is often cheaper and more reliable to replace the entire board with a new one, selected according to the model of the refrigerator. However, a qualified technician can resolder the burnt parts, restoring the functionality of the unit.
⚠️ Attention: Attempts to independently repair the electronic control unit without the appropriate qualifications can lead to a short circuit and complete failure of the entire electrical system of the refrigerator.
Frequently asked questions (FAQ)
Why does the refrigerator hum and vibrate loudly?
The humming can be caused by improper installation (the legs are not adjusted), or the condenser tubes touching the body or cabinet wall. Also, the source of noise may be a faulty compressor or system fan No Frost, on the blades of which ice could have stuck.
What to do if water appears inside the refrigerator?
First of all, check the drainage hole on the back wall. It could become clogged with crumbs or ice. Clean it with a special soft wire or brush. If water appears under the refrigerator, check the integrity of the condensate tray and water drainage tube.
Is it possible to operate a refrigerator if it does not freeze, but the light is on?
This unit cannot be operated. Products will begin to deteriorate, and an idling compressor may burn out. It is necessary to disconnect the device from the network, defrost it and call a technician for diagnostics.
How often do you need to defrost a refrigerator with a No Frost system?
The system No Frost assumes automatic defrosting of the evaporator. However, 1-2 times a year it is recommended to completely turn off the refrigerator, defrost it and wash it to remove the odor and disinfect the internal surfaces.
Why does the refrigerator work constantly without turning off?
The reasons may be different: freon leak, thermostat malfunction, door seal wear, or the set temperature is too low. This can also happen if you have just loaded a large amount of warm food.