Sudden silence in the kitchen or, conversely, a loud rumble, accompanied by melting ice in the freezer, always makes the heart beat faster. Refrigerator is a complex system where each element is responsible for maintaining low temperature, and the failure of even one part can lead to spoilage of food.
Understanding what exactly failed will help you make the right decision: call a technician, try to repair the unit yourself, or prepare to buy new equipment. In this article, we will analyze in detail the main components that are most often susceptible to breakdowns.
Primary diagnosis begins with an assessment of external signs: is there light inside, is ventilation working, is the sound of a running motor audible. Inverter models they may behave quieter than usual, but the complete absence of sounds often indicates an electrical problem.
Problems with the compressor and start relay
The heart of any refrigeration unit is compressor. If you hear a characteristic click, followed by a hum, and then silence, most likely the problem lies in starting the engine. The compressor tries to start, but the protective relay turns it off due to overload or lack of required torque.
A frequent cause of such symptoms is a malfunction start relay. This small device is responsible for supplying a starting pulse to the motor windings. If the relay is “stuck” or burnt out, the compressor will not be able to go into operating mode, remaining in the state of trying to start.
⚠️ Attention: If the compressor hums for more than 10-15 seconds, but does not start, immediately disconnect the device from the network. Long-term operation in this mode can lead to burnout of the motor windings and expensive repairs.
In some cases, the motor itself may be in good working order, but mechanically jammed. This can be determined if after replacing the relay the situation has not changed. It is also worth checking the integrity of the windings using a multimeter, since turn-to-turn short circuits are a common cause of failure.
How to check the windings with a multimeter?
To check, you need to remove the back cover, get to the compressor contacts and ring the resistance between the terminals. Normal values are usually in the range of 10-30 Ohms for the working winding and 30-100 Ohms for the starting winding. If the device shows (infinity) or 0, the winding is damaged.
Refrigerant leakage and clogged capillary system
If the refrigerator operates constantly without turning off, but the temperature inside does not drop to the required values, there is a high probability of leakage freon. The refrigerant circulates in a closed circuit, and any violation of the tightness of the evaporator or condenser tubes leads to a decrease in cooling efficiency.
Another common problem is clogging of the capillary tube. Oil circulates in the system, which over time can oxidize or mix with wear products, forming plugs. This prevents the normal flow of freon, creating excess pressure before the blockage and a vacuum after it.
It is rarely possible to diagnose a leak visually, since the gas is colorless and odorless. However, an indirect sign may be swelling of the side walls of the refrigerator or the appearance of oily stains (traces of oil) in the area where the tube is damaged. The blockage is often accompanied by uneven cooling: the freezer is working, but the refrigerator compartment is warm.
Malfunctions of the No Frost and defrost system
In modern models with the system No Frost a frequent problem is the formation of an ice “coat” on the evaporator, which blocks air circulation. The automatic defrosting process is controlled by defrost heating element, a thermostat (defroster) and a timer (or electronic control module).
If the heating element burns out, the ice on the evaporator does not melt during defrosting cycles. Gradually, the layer of ice becomes so thick that it blocks the channels through which cold air should enter the chambers. As a result, the products in the refrigerator compartment stop cooling, although the compressor is working properly.
The defrost thermostat is a sensor that monitors the temperature of the evaporator and gives a command to turn the heating element on or off. Its malfunction can lead to the heater either not turning on at all or heating for too long, damaging the plastic elements of the structure.
☑️ Signs of problems with No Frost
Failure of the thermostat and electronic module
In refrigerators with mechanical controls, it is responsible for maintaining the temperature thermoregulator. This device opens the electrical circuit when the set temperature is reached inside. If the contacts of the thermostat “stick” in the closed position, the compressor will work non-stop, freezing the food.
In models with electronic control, the functions of the thermostat are performed by thermal sensorwhich transmits data to the main control module. Failure of the sensor or breakage of its wires leads to the fact that the “brains” of the refrigerator receive incorrect information and incorrectly control the compressor and fans.
The most difficult and expensive breakdown is failure electronic module. Voltage surges in the network, moisture or manufacturing defects can lead to burning of tracks or microcircuits. In this case, the refrigerator may completely stop responding to commands or behave chaotically.
Mechanical damage and wear of seals
Complicated equipment is not always the cause of a warm camera. Often the problem lies in a banal violation of the tightness of the door. Rubber seal Over time, it loses elasticity, cracks or deforms, no longer fitting tightly to the body.
Through leaks, warm moist air enters the chamber, which condenses and turns into ice The compressor is forced to work in increased mode, trying to compensate for heat inflows, which leads to its overheating and increased energy consumption.
You can check the tightness of the fit using a simple sheet of paper: clamp it with a door around the perimeter. If the sheet pulls out too easily or has noticeable play, the seal requires replacement or restoration. It is also worth checking the door hinges - if they are skewed, the seal is broken even with a new seal.
Table of main symptoms and probable causes
For ease of diagnosis, we have systematized the main symptoms of malfunctions in the table below. This will help you quickly navigate the situation before the technician arrives.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| Buzzes, clicks, does not start | Start relay, compressor | Medium/High |
| Works without stopping, does not freeze | Freon leak, clogged | High |
| A lot of ice, no cold in the upper compartment | Defrost system (No Frost) | Average |
| Does not turn off, freezes a lot | Thermoregulator, sensor | Low/Medium |
| Water inside or under the refrigerator | Clogged drainage, seal | Low |
External factors and operating conditions
Sometimes the equipment is working properly, but works in inappropriate conditions. For example, installing a refrigerator too close to a wall or heat source (battery, stove) disrupts the heat transfer of the condenser. As a result, the cooling efficiency decreases and the load on the compressor increases.
It is also important to take into account the climate class of the device. If SN refrigerator (subnormal) is placed in an unheated garage at a temperature of +5°C, it may simply not start or work intermittently, since the oil in the compressor will become too thick, and the sensors will consider the ambient temperature sufficient.
⚠️ Attention: Do not install the refrigerator in niches without ventilation gaps. The minimum distance to the walls should be 5-10 cm for free air circulation around the capacitor.
Unstable voltage in the network is also a hidden enemy. Frequent surges may not damage the equipment instantly, but gradually “kill” the electronics and insulation of the motor windings. Using a surge protector or stabilizer can extend the life of the unit.
When you need professional repairs
There are a number of malfunctions that are strictly not recommended to be fixed on your own without special equipment and skills. These include work related to refrigerant. To search for leaks, evacuate the system and refill with freon, pressure gauge stations, leak detectors and pumps are required.
Also, complex repairs are required when replacing the compressor. This process involves soldering copper tubes with an open flame in close proximity to plastic elements and thermal insulation, which requires a highly qualified craftsman. An error can lead to a fire or repeated breakdown.
If the problem lies in the electronic control module, it is often necessary not just to replace the board, but to reflash or restore the power circuits, which is only possible in a service center with the appropriate software.
Is it possible to use a refrigerator if it does not freeze well?
Short-term use is possible, but not recommended. Products may deteriorate, and a compressor operating in emergency mode will quickly fail completely. It is better to move the food to another place and do diagnostics.
Why does the refrigerator make gurgling sounds?
Gurgling is the normal sound of refrigerant flowing through the system pipes. If the sound is not accompanied by a lack of cold or other anomalies, there is nothing to worry about.
How often should you defrost a refrigerator with No Frost?
The No Frost system does not require manual defrosting to remove ice. However, once every 6-12 months it is recommended to carry out a complete defrosting and washing for hygiene and cleaning hard-to-reach places from dust and bacteria.
What to do if the light bulb inside burns out?
You can replace the light bulb yourself by unplugging the refrigerator from the mains. Use lamps of a similar base and power, preferably special refrigeration lamps, resistant to vibration and low temperatures.
Is the burning smell from a working refrigerator dangerous?
A slight smell of plastic is possible only in the first hours of operation of new equipment. If a burning smell appears in an old refrigerator, this is a sign of overheating of the wiring, motor, or melted insulation. Immediate shutdown and diagnostics are required.