The situation when the refrigerator is hummingbut it is warm inside is one of the most common and worrying for the owner of household appliances. You open the door, expecting the usual cold, but instead you feel room temperature, and the unit continues to work monotonously. This behavior indicates that the engine is working properly and is trying to perform its function, but the cooling cycle is broken for some reason.
This symptom cannot be ignored, since compressorworking in vain, it quickly overheats and can burn out, which will lead to expensive repairs. Initial diagnostics help to understand the scale of the problem: perhaps it is a simple defrosting problem, or perhaps there is a serious refrigerant leak. In this article we will analyze in detail the main reasons why refrigerator stopped freezingand determine what steps need to be taken.
It is important to understand that modern models, be it Indesit, LG or Atlant, have similar operating principles, but different control systems. Therefore, before calling a specialist, it is worth carrying out a number of independent checks that can save your time and budget. Let's look at the main breakdown scenarios.
Violation of operating rules and external factors
Before diagnosing a complex technical malfunction, it is necessary to eliminate trivial errors in operation. Users often wonder why the refrigerator does not cool, although the problem lies in basic things. For example, if the unit was recently defrosted and started too early, or if the door was not tightly closed for a long time, the temperature inside may simply not have had time to drop.
It is also worth paying attention to the location of the equipment. If refrigerator stands close to a wall or in a niche without a gap for ventilation, heat transfer is disrupted. The compressor wears out, hums, but cannot effectively remove heat. In such cases, the protection system may block the start of the full cooling cycle.
⚠️ Attention: If you have just defrosted the refrigerator, do not load it with food immediately. Let it run idle for 2-3 hours to reach the required temperature.
Check the following points, which are often overlooked:
- 🔌 Check the tightness of the door to the body - the rubber seal may be dirty or deformed.
- ❄️ Make sure that The temperature control was not accidentally moved to the "minimum" or "0" position.
- 🌡️ Do not place hot or warm foods in the chamber - this sharply increases the internal temperature and throws off the sensors.
Sometimes the problem is solved by a simple defrosting No Frost system. If the evaporator is covered with an ice coat, the air does not circulate and the cold does not enter the chamber. Leave the refrigerator turned off overnight with the doors open so that all the ice melts.
Faults of the thermostat and sensors
If external factors are excluded, the next probable cause is failure of thermostat or electronic temperature sensors. It is these components that “tell” the compressor when to turn on and when to stop. If the thermostat is broken in the "open" position, the motor will not receive a signal to start, although the light in the chamber may be on.
In models with electronic control, they are responsible for temperature control thermal sensors. Their malfunction causes the control module to “think” that there is already cold in the chamber and does not start the compressor. As a result, you hear silence or occasional clicks, but there is no cooling. In older models with mechanical control, a breakdown of the thermostat is often manifested by the absence of a characteristic click when turning the knob.
Diagnostics of the thermostat requires a multimeter to “test” the contacts. If the sensor rod contacts do not close when the temperature changes, the part must be replaced. This is one of the most common reasons why the refrigerator has stopped freezing after defrosting or a power surge.
Symptoms of sensor malfunction are often accompanied by errors on the display (if there is one) or incorrect behavior of the compressor (working in too short cycles or not turning on at all).
Problems with the starting relay and compressor
One of the most serious problems is the malfunction of the very heart of the refrigerator - compressor, or its starting mechanism. If you hear the motor trying to start, it hums for a few seconds, then there is a click and it dies down - this is a classic symptom of a problem with the starting relay or motor windings.
Start relay is responsible for supplying a starting pulse to the compressor winding. If it burns out or sticks, the motor cannot switch from rest mode to operating mode. In this case refrigerator hums from voltage, but does not start. Replacing the relay is an inexpensive procedure and is often done independently.
However, if the relay is working properly, and the compressor still does not start or hums and immediately turns off, it is possible that turn-to-turn short circuit windings have failed or jamming of the piston group. In such a situation, the engine tries to operate, consuming a huge current, which triggers the thermal protection.
To check the condition of the starting relay and the compressor, you can use the following checklist:
It is important to note that if the compressor overheats greatly (up to 90°C and above) and smells of burnt insulation, further starting attempts may be dangerous. In this case, a professional replacement of the unit is required.
Leakage of freon and blockage of the capillary system
If the compressor runs constantly, without stopping, hums smoothly, but there is no cold at all or it is very weak, most likely it has occurred refrigerant leak (freon). Freon is a working fluid that circulates through a system of tubes, picking up heat. If there is little or no cooling at all, cooling is impossible, no matter how long the motor runs.
Leaks often occur in places where pipes are soldered, in the evaporator (especially if it was damaged with a knife during defrosting) or in the foamed part of the housing. Signs of a leak are: the absence of characteristic seething in the condenser tubes (at the back of the refrigerator) and the absence of heating of the radiator grill.
The second option is Clogged capillary tube. An ice or oil blockage may have formed in the system, blocking the circulation of freon. The compressor creates pressure and hums, but the gas does not pass through the narrow section of the tube. In this case, one part of the system may be hot and the other cold.
| Symptom | Probable cause | Nature of compressor operation |
|---|---|---|
| The compressor is silent, there is no light | No electricity, the cord is burned out | Does not work |
| Buzzes, clicks, does not start | Faulty start relay | Short-term attempts |
| Works constantly, does not freeze | Freon leakage | No stopping |
| It freezes slightly, ice freezes | Clogged system or loss of tightness | Cycically or constantly |
⚠️ Attention: Self-filling the refrigerator with freon is impossible without special equipment and skills. If you suspect a leak, call a technician.
Failures in the operation of the control module
In modern refrigerators with a system No Frost and electronic control, the control module (board) is responsible for all processes. If the triacs on the board that control the compressor burn out, or the tracks fail, the signal to start the motor simply does not arrive.
Often such breakdowns occur after power surges in the network. Outwardly, it may look like this: the refrigerator is humming (the fan is running), the light is on, the display may show an error or, conversely, behave normally, but there is no cold. Diagnostics of the module requires special knowledge and tools.
Sometimes the problem is solved by rebooting the system: unplug refrigerator from the outlet for 15–20 minutes. If after turning it on it works normally, then a software failure has occurred. If the situation repeats, a repair or replacement of the board is required.
Specifics of two-compressor models
Owners of equipment with two compressors (separately for the freezer and refrigerator) should take into account that the breakdown of one of them does not affect the operation of the other. If you the refrigerator compartment does not freezebut the freezer is working perfectly, the problem is localized in the circuit of the upper chamber.
This may be a malfunction of its thermostat, a freon leak in this particular circuit, or a breakdown of the solenoid valve that switches the flow refrigerant. In such models, diagnostics are more difficult, since it is necessary to determine which particular unit has failed.
Often in two-compressor models Indesit or Ariston there is a problem with a crying evaporator, which becomes overgrown with ice and stops giving off cold. This can be solved by complete defrosting or replacing the defrost heater.
When you need to call a technician
Independent repair is only possible in cases of replacing the thermostat, start relay or simple defrosting. In all other situations, especially those related to a sealed circuit, it is better to turn to professionals. Attempts to solder tubes without vacuuming the system will lead to rapid failure of the equipment.
A technician is needed if:
- 🛠️ You have discovered mechanical damage to the tubes or evaporator.
- 🔥 The compressor gets very hot and has an odor burning.
- 💧 Traces of oil are visible inside the refrigerator compartment (a sign of depressurization).
- 📉 After defrosting, the refrigerator did not start freezing within 24 hours.
Remember that timely repairs are often cheaper than replacing a burnt-out compressor or buying a new refrigerator. Do not delay diagnostics if you notice that the refrigerator is humming, but not freezing. In total, there was ice left in the system that blocked the channels, or a power surge occurred when turned on, damaging the start relay. It is also possible that the light switch in the door is stuck and the compressor does not receive a signal to work. The refrigerator hums, but does not freeze.
Frequently asked questions (FAQ)
Why does the refrigerator hum but not freeze after defrosting?
Most likely, there was ice in the system that blocked the channels, or there was a power surge when turned on, damaging the start relay. It is also possible that the light switch in the door is stuck and the compressor is not receiving a signal to operate.
Can a refrigerator stop freezing due to a loose door?
Yes, if the door does not fit tightly, warm air constantly enters the chamber. The compressor is working hard, trying to compensate for the heat, but it can’t cope. As a result, it may overheat and shut down, or the freezer will become covered with ice, blocking the air ducts.
What to do if the compressor is hot, but there is no cold?
A hot compressor in the absence of cold often indicates a freon leak or a clogged capillary system. The engine is idling. It is necessary to turn off the device and call a technician to look for leaks and refuel.
How to understand that the compressor has burned out?
If when you turn on you hear a loud beep, then a click and silence, and the motor housing itself is cold or barely warm, the starting relay is probably burned out. If the motor hums, gets very hot and smells burnt, but does not start, there may be an inter-turn short circuit in the windings.