The situation when a refrigerator suddenly stops working can take any home cook by surprise. Inside the cells, food quickly deteriorates, and the kitchen becomes unusually quiet or, conversely, too noisy. The first thing you should do is not panic and look for the phone number of the service center, since in many cases the problem can be fixed on your own, saving time and budget.
Before disassembling the unit, it is necessary to carry out initial diagnostics. Often the reason for the lack of cold is a simple power outage or damage to the power cord, which is easy to check visually. It is also worth paying attention to whether the indicator on the front panel is on and whether the sound of the motor is heard.
In this article we will examine in detail the main causes of malfunctions, from simple operating errors to complex technical failures. You will learn how to check thermostat, replace the rubber seal and when to call a technician.
Primary diagnostics: why is the compressor silent?
If the refrigerator is plugged in, but the compressor does not start, first check for voltage in networks. Perhaps the fuse has blown out or the contact in the socket has come loose. Try plugging in another electrical appliance, such as a hairdryer or kettle, into the same outlet to make sure the power supply is working properly.
⚠️ Attention: Never try to repair the electrical wiring of the refrigerator while it is connected to the network. Carry out any manipulations with wires and contacts only after completely disconnecting the device from the power supply to avoid electric shock.
If there is voltage, inspect the power cord and plug itself. There should be no melting, cracks or signs of overheating. In modern models, it is often installed control module, which can block the start of the compressor during power surges. Try unplugging the refrigerator from the outlet for 10-15 minutes and then turning it on again - this action will reboot the electronic board.
Sometimes the reason lies in incorrect installation. If the unit is too close to a wall or heating devices, the cooling system may go into protective mode. Make sure that the gap between the back of the refrigerator and the wall is at least 5-7 cm for normal air circulation.
Problems with the thermostat and temperature sensors
One of the most common reasons why the refrigerator stops freezing is the failure of the thermostat or electronic sensor. In older models with mechanical control, a thermostat is responsible for regulating the temperature, which physically opens the circuit when the set parameters are reached. If its contacts are “stuck” in the open state, the compressor simply will not receive a signal to start.
You can check a mechanical thermostat by closing its contacts directly (this should be done by a person with electrician skills). If the motor starts working after closing the contacts, then the part requires replacement. Models with a system No Frost and electronic control use thermal sensors that transmit readings to the main control unit.
A sensor malfunction is often accompanied by erroneous readings on the display or a complete lack of response to changing settings. For diagnostics, you will need a multimeter: you need to “ring” the sensor at different temperatures. The resistance of a working element should change smoothly, without jumps or breaks.
How to remove the thermostat?
To replace the thermostat, remove the regulator handle, unscrew the decorative panel inside the chamber and carefully remove the capillary tube from its seat. Do not damage the tube when installing a new part.
Malfunctions of the starting relay and compressor
If you hear a click when you try to start, but the engine immediately stalls, the problem most likely lies in the starting relay. This is a small device that provides an impulse to start the motor windings. Over time, the relay contacts oxidize or burn, which makes it impossible to start the compressor.
You can replace the starting relay yourself by selecting a similar model according to the markings. It is usually mounted on the side of the compressor and secured with a plastic clip or screw. Before replacing, be sure to take a photo of the wire connection diagram so as not to mix up the contacts during assembly.
A more serious problem is the malfunction of the wire itself. compressor. If the engine hums but does not start, or makes a metallic knock, the piston group may be jammed. In this case, independent repair is impossible; the entire unit must be replaced, which is often not economically feasible.
Freon leakage and blockage capillary tube
If the compressor runs continuously, but there is no cold in the chambers, and the condenser (grid at the back) remains cold, a refrigerant leak is likely. Freon can escape through microcracks in the tubes that form due to corrosion or mechanical damage. Finding a leak visually is almost impossible without special equipment.
Another common reason is a clogged capillary tube. An ice or dirt plug may form in the refrigerant circulation system, which blocks the flow of freon. In this case, the filter drier may become covered with frost, and the compressor will work with overload.
To eliminate these problems, you need to call a specialist with a vacuum pump and a pressure gauge station. It will not be possible to fill the system with freon and solder the tubes without experience and tools, and an attempt may lead to final breakdown of the unit.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| The compressor is humming, but not starts | Faulty starting relay | Replacing the relay |
| The refrigerator is silent, there is no light | No power or burnt wire | Checking the socket and cord |
| Works constantly, no cold | Freon leak | Looking for leaks and refilling |
| Very freezing, does not turn off | Thermostat is faulty | Replacing the thermostat |
Problems with the defrosting system in No Frost models
In refrigerators with the system No Frost the automatic defrosting system often fails. It consists of a timer, an evaporator heater and a defrost sensor. If one of these elements breaks, a “coat” of ice grows on the evaporator, which blocks the circulation of cold air.
As a result, it becomes warm in the main chamber, and in the freezer the temperature may be normal or also increase. A characteristic sign of such a malfunction is that after complete defrosting (for 24 hours with the doors open), the refrigerator begins to freeze normally, but after a few days the problem returns.
To check, you need to remove the back panel in the freezer and visually assess the condition of the evaporator. If it is covered with ice, check the heater for integrity (should be called by a tester) and the defrost sensor. The defrost timer could also “stick” in the cooling mode.
☑️ Checking the No Frost system
Wear of the sealing rubber and loss of tightness
Tight fit of the door - the key to efficient operation of the refrigerator. If sealing rubber is worn out, torn or simply dirty, warm air constantly penetrates into the chamber. The compressor tries to compensate for heat loss and works non-stop, which leads to rapid wear and high energy consumption.
You can check the tightness with a simple test with a sheet of paper. Press the door around the perimeter of the sheet and try to pull it out. If the paper is pulled out easily and without resistance, it means that the seal is broken in this place. Often, it is enough to simply wash the elastic with warm water and soap to remove grease and dirt that interfere with the fit.
If the elastic has become deformed, you can try to restore its shape by heating it with hot water or a hairdryer. However, if the material becomes cracked or hard, the seal will need to be completely replaced. It is better to order a new part according to the exact model of the refrigerator, since the door geometry differs from different manufacturers.
⚠️ Attention: When installing a new rubber seal, do not stretch it excessively. A stretched seal will not fit tightly to the housing, and the problem of tightness cannot be solved.
Frequently asked questions and answers (FAQ)
Why does the refrigerator hum loudly after defrosting?
A loud hum immediately after defrosting may be due to the fact that the compressor began to work with increased load, trying to gain temperature. Also check whether the case is vibrating against furniture or the floor. If there is a hydraulic noise in the pipes, this is normal during the first hours of operation.
Is it possible to operate a refrigerator if it does not freeze, but the light is on?
It is impossible to operate such a refrigerator. The products will deteriorate, and the compressor, running idle or in emergency mode, may burn out. It is necessary to identify the cause of the lack of cold and eliminate it.
How often do you need to defrost a No Frost refrigerator?
The system No Frost implies automatic defrosting, however, once every 6-12 months it is recommended to completely defrost and wash the chambers to remove bacteria and odors, as well as to prevent blockages in the drainage system.
What to do if water appears inside the refrigerator?
Water at the bottom of the refrigerator most often indicates a clogged drainage hole. It is located on the back wall. Clean it with a special stick or soft wire so that moisture can freely flow into the evaporator.