The situation when the refrigerator suddenly stops cooling food always takes you by surprise. This is not just a household inconvenience, but a real threat of spoilage of food supplies, which is especially important in the hot season. The owner immediately begins feverishly going through recent events in his memory: were there any power surges, was the chamber too tightly packed, or perhaps defrosting has not been carried out for a long time?
However, there is no need to panic ahead of time. Often cause of breakdown hidden in trivial things that can be fixed without calling a specialist. Sometimes it is enough to simply check the tightness of the door or defrost the unit so that it works normally again. In other cases, the problem lies deeper - in electronic components or refrigerant.
In this article we will analyze in detail all possible scenarios why refrigerator it may stop freezing, and we will offer an algorithm of actions for self-diagnosis. You will learn to distinguish simple failures from serious technical malfunctions that require professional intervention. Understanding the principles of operation of the device will help you save time and money.
Primary diagnostics: simple reasons for stopping
Before looking for complex technical faults, it is necessary to eliminate basic operating errors. Users often forget about basic rules, which leads to apparent breakdowns. For example, if you have just placed a large amount of warm food into the chamber, the compressor may simply not be able to cope with the sudden temperature increase.
Pay attention to how tightly the door closes. If rubber seal is worn out, dirty or deformed, cold air will constantly escape out. In this case, the motor will work continuously, trying to compensate for the losses, but the temperature inside will not drop to the desired values.
- 🔌 Check whether the plug is firmly inserted into the socket and whether there is voltage in the network.
- ❄️ Make sure that the thermostat is not unscrewed minimum or in defrost mode.
- 🌡️ Do not load a large amount of warm food into the chamber at the same time.
- 🚪 Check whether a foreign object is preventing the door from closing tightly.
It is also worth checking the temperature settings. Accidental movement of the regulator or a failure in the electronic control module could change the set parameters. In modern models with a display electronics failure may be displayed as an error code that can be easily deciphered in the instructions.
Problems with the defrosting system (No Frost)
If your unit is equipped with a system No Frostthen One of the most common reasons for the lack of cold is a malfunction of the defrost system. Unlike drip models, here the evaporator is hidden and becomes covered with ice unnoticed by the user. Over time, the layer of ice becomes so thick that it completely blocks the air circulation channels.
In this case, the fan hums, the compressor works, but cold air simply cannot get into the main chamber. Ice blocks air flow and food begins to spoil. Most often, one of the elements of the defrost circuit fails: the evaporator heating element, the defrost sensor or the timer (in mechanical models).
⚠️ Attention: Attempting to chip the ice with a knife or other sharp objects is strictly prohibited. You can puncture the evaporator tubes, which will lead to immediate release of freon and expensive repairs.
Diagnostics often require a full defrost cycle. If after 24 hours the refrigerator started working normally, but a week later the problem recurred, it means that one of the components of the defrosting system requires replacement.
☑️ Diagnostics of the No Frost system
It is important to understand that in models with electronic control, control moduleis responsible for the defrosting process. If it is “stuck” or burnt out, the command to turn on the heating element may simply not be received, even if the heater itself is working.
Faults of the compressor and start relay
The compressor is the heart of the refrigerator, and if it does not start, then there will be no cold. However, the absence of a motor hum does not always mean its death. Often the problem lies in the starting relay, which supplies the starting pulse. If the relay is stuck or burnt out, the compressor will only click quietly, trying to start, but will not start working.
A more serious situation is when the motor hums, heats up, but does not start, or works constantly, without turning off, but does not cool. In the first case, there may be jamming of the piston group, in the second - loss of performance. Motor-compressor has a limited resource, and its wear over time is inevitable.
| Symptom | Probable cause | Required actions |
|---|---|---|
| The motor is silent, there is no light | No power or the module is burned out | Check the socket and wiring |
| Clicks, the motor does not start | Faulty starting relay | Replacing the relay (budget repair) |
| Humming, but not cooling | The compressor is jammed or leaking | Call a technician for diagnostics |
| Works without stops | Freon leak or wear | Checking pressure and refueling |
If you hear a loud knock or metallic clanging sound when starting, this is a bad sign. Most likely, the internal mechanical parts of the compressor are destroyed. In this case, replacing the compressor it will be economically feasible only for new or expensive models.
How to check the starting relay yourself?
To check the relay, it must be carefully removed from the contacts of the compressor. If, when shaking inside, a clear knocking sound of the ball is heard (like in a rattle), it means that the mechanism is destroyed and requires replacement. You can also ring the contacts with a multimeter: in the normal position, the resistance should be close to zero, and if turned over, there should be an open circuit (for a relay with a posistor).
Refrigerant (freon) leakage
One of the most insidious problems is a refrigerant leak. Freon circulates in a closed circuit, and in a working refrigerator its amount does not change for years. However, corrosion of tubes, microcracks in the evaporator or poor-quality factory soldering can lead to depressurization of the system.
The main sign of a leak is that the refrigerator works almost without interruption, trying to gain temperature, but there is no cold or it is very weak. In this case, the rear wall (radiator grille) may remain warm or only partially heat up. Freon leakage often occurs in places of hidden connections or in the foamed part of the case.
It is almost impossible to independently find the location of the leak without special equipment (leak detector). The technician uses nitrogen to pressurize the system and creates excess pressure to identify the weak point. After eliminating the hole, the system is evacuated and refilled with new gas.
⚠️ Attention: Freon is odorless and colorless. If you smell a strange chemical smell, it could be an oil leak from the compressor, which also indicates a serious problem.
Clogged capillary tube
The capillary tube is the thinnest channel through which the refrigerant enters the evaporator. Its diameter is so small that even a microscopic particle of debris remaining after repairs, or oil oxidation products can completely block the freon flow. This phenomenon is called clogging.
Signs of a blockage are often confused with a leak: the compressor works, but there is no cold. However, if clogged, the condenser (grid at the back) will be hot only at the very beginning, and then cool down. At the same time, the compressor itself can become very hot, as it pumps gas “to nowhere”, experiencing overload.
Removing the blockage requires professional cleaning of the system under pressure or replacing the capillary tube. Sometimes turning the device on and off briefly helps to try to “push” the plug, but this is a temporary measure. In most cases, a full repair is required with the replacement of the filter-drier.
Failures in electronic control
Modern refrigerators are crammed with electronics. Thermostats have been replaced by sensors, and mechanical relays have been replaced by complex control modules. If electronic module fails, it may incorrectly read temperature readings or not send a signal to start the compressor.
Often the problem lies in the oxidation of the temperature sensor contacts. Moisture that gets inside the camera leads to corrosion of the connectors. As a result, the control module “thinks” that the temperature is normal and does not turn on the refrigeration, although in reality the products are already defrosting.
- 📟 Strange symbols or indicators may flash on the display.
- 🔌 Power surges in the network are a common cause of control board burnout.
- 🌡️ The sensor may show incorrect data, disrupting the operation algorithm.
Sometimes a complete reset helps, which can be done by unplugging the appliance for a long time (more than 30 minutes). If after turning on the problem returns, it is necessary to replace the sensors or repair the board.
Frequently asked questions (FAQ)
Why does the refrigerator hum, but does not freeze after defrosting?
This may indicate several problems. If you defrosted it for less than a day, there may be ice left in the system that has blocked the channels again. If defrosting was complete (24+ hours), then a freon leak or a clogged capillary system is likely. Also, the compressor could have failed, which hums but does not pump gas.
Is it possible to operate a refrigerator if it does not freeze well?
For a short time - yes, but not recommended. Operation in emergency mode leads to overload and combustion of the compressor, which will significantly increase the cost of repairs. In addition, in a warm environment, bacteria multiply quickly, and products can become hazardous to health.
How often do you need to defrost a No Frost refrigerator?
The system No Frost assumes automatic defrosting of the evaporator. However, once every year or year and a half, it is recommended to completely turn off the refrigerator, defrost it and wash it by hand. This is necessary to remove bacteria and check the condition of drainage holes that may become clogged.
Why is there ice in the freezer, but warm in the refrigerator?
Most often this is a sign of a malfunction of the defrost system in No Frost models. The evaporator in the freezer is clogged with ice, and the fan cannot move cold air into the upper chamber. It is also possible that the air duct between the chambers may freeze. Diagnostics of the heating element and defrost sensors is required.