The situation when the freezer suddenly stops freezing always takes you by surprise. Food begins to deteriorate, and an unpleasant odor appears in the room. There is no need to panic at this moment, since in many cases the problem can be solved on your own without calling a technician. Primary diagnostics will help to understand the scale of the disaster and determine whether urgent defrosting is required or whether the matter is a more serious breakdown of the components.
Before disassembling the unit, it is necessary to conduct a visual inspection and listen to the operation of the motor. Often the reason for the lack of cold is a banal overload or a leak in the chamber. Understanding the principles of operation refrigeration circuit will allow you to quickly localize the fault. In this article we will analyze in detail all possible causes, from simple operating errors to complex technical defects.
Primary diagnostics and checking the power supply
The first thing to do if the freezer has stopped cooling is to make sure there is electricity. Check whether the indicator on the control panel or inside the main camera is lit. If the light does not come on, the problem may not be with the refrigerator, but with the outlet or surge protector. Try connecting the device to a different power source to eliminate voltage surges or wiring faults.
Pay attention to the operation of the compressor. If the engine hums, but there is no cold, or it turns on for a few seconds and immediately turns off with a characteristic click, this indicates problems with starting the engine. In modern models with the system No Frost it is also important to listen to the operation of the fan. The absence of rotating blade sounds may indicate that air is not circulating through the system and the freezer is not getting cold.
⚠️ Warning: If you smell a burning smell or see sparking in the outlet area or on the back of the appliance, immediately unplug the refrigerator. Continued operation in this condition may result in a fire.
Check the integrity of the power cord. Insulation damage often causes unstable operation of electronics. If the cable is visually intact, but the refrigerator does not turn on, the internal fuse or control unit may have failed. In such cases, without a multimeter and the skills to read electrical circuits, it is better not to take risks.
No Frost system: defrosting and checking defrost
The most common reason that the freezer in models with the system stops freezing No Frostis the formation of an ice coat on the evaporator. Ice blocks the air channels, and the cold simply does not reach the food. In this case, it is necessary to completely defrost the refrigerator. Unplug the appliance, open all doors and leave it for at least 12-24 hours.
After defrosting, turn on the refrigerator and check its operation. If the cold appears, but after a few days the situation repeats, it means that the defrosting system is faulty. It consists of three main elements: Evaporator heating element, a defrost sensor and a timer (or electronic module). If at least one of these components fails, the ice stops melting and gradually clogs the system.
- ❄️ The evaporator heating element could burn out due to a power surge or natural wear of the nichrome spiral.
- 🌡️ The temperature sensor (defroster) could lose sensitivity and not send a signal to turn on the heater.
- ⏱️ The defrost timer could “stick” in the cooling mode, without starting the defrost cycle.
To check the heating element, you will need a multimeter. It is necessary to “ring” the heating element for resistance. If the device shows an open circuit, the part must be replaced. It is also worth checking the integrity of the wiring going to the heating element, since in conditions of high humidity the contacts often oxidize.
☑️ Checklist for complete defrosting
Problems with the thermostat and temperature sensors
Thermoregulator (thermostat) - This is a device that monitors the temperature inside the chambers and commands the compressor to turn on or off. If the freezer in the refrigerator stops working, but the main chamber continues to cool (or vice versa), there is a high probability of a malfunction of this particular unit. In mechanical models, this is a knob with numbers; in electronic models, it is touch sensors.
If a mechanical thermostat fails, the contacts inside it may oxidize or stick. As a result, the compressor either does not start at all or works non-stop, trying to achieve non-existent cold. You can check a mechanical thermostat by closing its contacts directly. If after this the refrigerator starts working, then the regulator needs to be changed.
In models with electronic control, air sensors are responsible for the temperature. They are located at different points in the camera. If one of the sensors shows incorrect values (for example, that the freezer is already -30°C, although it is warm), the control module will not start the compressor. Diagnostics of such sensors is also carried out using a multimeter by measuring resistance at different temperatures.
⚠️ Attention: When replacing a thermostat or sensors, it is important to use original spare parts or their complete analogues. Installing an unsuitable part with other temperature characteristics will lead to incorrect operation of the refrigerator.
Malfunctions of the compressor and start relay
The compressor is the “heart” of the refrigerator, which pumps refrigerant through the system. If the engine does not start, there will be no cold anywhere. A common cause of starting failure is a faulty start relay. This is a small box that fits over the compressor contacts. Inside there is a coil and a mechanism that starts the engine.
If the relay is faulty, the compressor may hum but not start, or it may make a clicking sound and go silent. In this case, the relay must be replaced. This is an inexpensive part, and replacing it does not require any special skills other than the ability to remove the back cover and disconnect the connectors. However, if after replacing the relay the situation has not changed, the problem may be in the compressor itself.
An interturn short circuit of the compressor winding is a serious breakdown. In this case, the engine can become very hot, hum and knock out plugs. Repairing the compressor at home is impossible; it must be replaced by a specialist using a vacuum pump and a refrigerant filling station.
How to check the start relay?
Remove the relay from the contacts of the compressor and shake it. If a ringing sound is heard inside (as if from a dropped coin), it means that the mechanism is damaged and requires replacement. Also visually inspect the contacts for the presence of burning.
Freon leak and clogged capillary tube
If the compressor is working normally, humming continuously, but the freezer is not cooling, and the evaporator inside is clean and only partially cold (or completely warm), most likely there is a refrigerant leak. Freon circulates in a closed circuit, and if a microcrack has formed in the tubes (often due to corrosion or mechanical damage during cleaning), the gas gradually comes out.
Another common problem is clogged capillary tube. An ice or oil blockage may have formed in the system, which prevents the circulation of freon. In this case, the compressor tries to push through the plug, works with overload, but there is no cold. You can determine the blockage by touch: the condenser tubes (at the back) can be cold or warm only at the compressor, and then cool down.
Diagnostics of leaks and blockages requires professional equipment. The technician uses a leak detector to find the leak, then seals the damaged area, evacuates the system and refills with new freon. It is almost impossible to eliminate a leak or break through a blockage on your own without special means.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| The compressor does not turn on, silence | No power supply, the thermostat or relay has burned out | Check the socket, replace the relay/thermostat |
| Buzzes, clicks and turns off | Faulty starting relay or compressor wedge | Replacing the relay, compressor diagnostics |
| Works constantly, but does not freeze | Freon leak or system blockage | Call a technician to find the leak and refill |
| It freezes slightly, ice freezes | The defrost system is faulty (No Frost) | Check Heating element, sensor and timer |
Mechanical damage and leakage
Often users themselves do not notice how they damage the rubber seal on the freezer door. If the door does not fit tightly, warm air constantly enters. The compressor tries to compensate for the heat, working hard, but the temperature does not drop to the required values. As a result, ice forms on the walls, and food spoils.
You can check the tightness in a simple way: hold a sheet of paper between the door and the body. If the paper comes out easily without resistance, the seal is worn or warped. It is also worth checking the door hinges - if they are loose, the door may warp and not close completely.
Mechanical damage may also occur inside the chamber. Piercing the evaporator with a knife while trying to break off ice is a catastrophic mistake. In this case, the freon comes out instantly, and the refrigerator stops freezing forever until a complex repair is made by replacing the evaporator.
When you need to call a specialist
Not all damage can be repaired with your own hands. If you've checked the electrical system, defrosted it, and made sure the seals are intact, but the refrigerator still doesn't work, it's time to call a professional. This is especially true when it is necessary to open the refrigeration circuit.
An independent attempt to solder tubes or replace a compressor without the appropriate equipment (vacuum pump, pressure gauge station, scales for freon) will only lead to equipment damage. In addition, inept actions can be hazardous to health due to the possible ignition of some types of refrigerants upon contact with air.
Be sure to call a professional if:
- 🔧 You find an oily stain under the refrigerator (a sign of a freon leak with oil).
- 🔥 The compressor gets very hot and makes unnatural sounds.
- 💨 A hissing sound of gas coming out is heard from the system.
⚠️ Attention: Modern refrigerators use complex mixtures of refrigerants. Filling by eye or with the wrong gas may damage the compressor or lead to an explosive situation. Entrust refilling only to certified specialists.
Prevention of repeated breakdowns
In order for the freezer to work properly for many years, it is important to follow the operating rules. Do not load hot food into the chamber - this will place excessive load on the compressor and lead to the formation of excess ice. Also, do not overcrowd the freezer; air should circulate freely between the products.
Carry out preventive defrosting regularly, at least once a year, even if you have a system No Frost. This will help remove micro-ice in hard-to-reach places and check the operation of the system. Keep the condenser at the back of the refrigerator clean - a layer of dust a couple of millimeters thick can reduce the cooling efficiency by 20-30%.
Maintaining temperature conditions and timely maintenance are the key to the long life of your equipment. If you notice the slightest changes in the operation of the refrigerator (extraneous noise, more frequent switching on, condensation on the walls), do not delay diagnostics. Early detection of the problem in 80% of cases allows you to avoid expensive repairs.
Frequently asked questions (FAQ)
How long does it take the refrigerator to get cold after defrosting?
Usually it takes from 2 to 6 hours to reach the temperature. At this time, you should not load the camera with food. If after 8-10 hours of idling the freezer has not cooled down, it means there is a malfunction.
Is it possible to use the refrigerator if it does not freeze well?
For a short time, it is possible, but the food may spoil. Long-term operation in this mode is harmful to the compressor, which operates without stopping. It is better to find the cause and eliminate it.
Why did the refrigerator start to freeze after defrosting, but after a week it stopped again?
This is a classic sign of a malfunction of the defrosting system (heating element, sensor or timer). Ice accumulated again and blocked the channels. Diagnosis and replacement of the failed element is required.
Is it dangerous to breathe freon vapors during a leak?
Modern freons (R600a, R134a) are not toxic in small quantities, but R600a (isobutane) is explosive at concentrations in air above 4%. If a leak is detected, it is necessary to ventilate the room and not turn on sparking electrical appliances.
Is it necessary to change the filter drier during repairs?
Yes, if the refrigerator circuit is opened in any way (replacing the compressor, eliminating a leak), the filter drier must be replaced. It accumulates moisture and cannot be restored.