The situation when you open the refrigerator door, and it’s warm inside, is familiar to many and causes panic. The food begins to deteriorate, the ice melts, and an unpleasant odor appears in the chamber. This is a sure sign that cooling system has failed and requires immediate intervention. However, before calling service or buying a new unit, it is worth carrying out an initial diagnosis.
Often the reason lies not in a complex engine breakdown, but in banal violations of operating rules or trifles that are easy to fix yourself. Understanding the operation and circulation of refrigerant will help you save time and money. In this article we will analyze in detail all possible scenarios of equipment failure. compressor and refrigerant circulation will help you save time and money. In this article we will analyze in detail all possible scenarios for equipment failure.
It is important not to ignore the first signs of unstable operation, such as turning on the motor too often or, conversely, its complete silence. Timely reaction can save expensive repairs. Let's figure out what factors most often lead to loss of cold.
Incorrect operation and simple errors
Before you commit a breakdown compressor, make sure that you yourself have not created conditions for overloading the system. Often, users place freshly prepared hot soups in the freezer or tightly pack the freezer with room temperature foods. This forces the equipment to work hard, trying to cool a large volume of heat.
Also pay attention to the tightness of the door. If seal is worn out, dirty or deformed, the cold will evaporate out and warm air will flow in. As a result, the sensors detect an increase in temperature and command the motor to work continuously, but there is no desired effect.
⚠️ Attention: Never put hot pots in the refrigerator. This leads to a sharp jump in the load on the compressor and can cause it to wear out prematurely or even jam.
Check whether the door is touching foreign objects or food lying on the shelves at the very edge. Even a small gap of 1-2 millimeters breaks the tightness of the circuit. In modern models with the system No Frost this also leads to freezing of the evaporator and stopping air circulation.
- 🔍 Check the cleanliness of the rubber seal around the perimeter of the door.
- 🌡️ Make sure that the equipment is not standing next to the radiator or stove.
- 🚪 Check whether the door closes tightly without outside intervention.
- 🧊 Do not load the chamber with warm food in large volumes.
Problems with the thermostat and sensors
One of the common reasons why the refrigerator stops freezing is failure thermostat. This small device is responsible for turning the compressor on and off depending on the temperature inside the chambers. If it is “stuck” in the “off” position, the motor simply will not receive a signal to start.
In models with electronic control, thermal sensoris responsible for this process, which may give incorrect readings due to oxidation of contacts or internal failure. In this case, normal values may appear on the display, although the chamber is actually warm. Diagnostics of such elements requires the use of a multimeter to check the resistance.
Sometimes the problem lies in the defrost button, which could be stuck or oxidized. If the circuit is forced open, the compressor will not start, even if the chamber is hot. Replacing these elements usually does not require complex equipment and can be done at home with basic skills.
How to check a mechanical thermostat?
To check a mechanical thermostat, you need to remove it and close the contacts directly. If the compressor starts working, it means the regulator is faulty and requires replacement. Be careful with electricity!
It is worth noting that in two-compressor models one of the thermostats could fail, which is why only one chamber, for example, the refrigerator, does not freeze, while the freezer is working properly. This narrows the scope of troubleshooting to a specific circuit.
Faults of the compressor and start relay
The heart of any refrigerator is compressor. If it hums but won't start, or makes a loud clicking noise and stops, the problem is most likely in the start relay or motor windings. The relay is an inexpensive part that often fails first, protecting the motor from overloads.
When you try to start, the faulty relay makes a characteristic metallic click, followed by silence. If you hear this sound and the compressor is hot but not spinning, there may be a problem with the jamming piston group. In this case, the motor hums, consuming current, but does not create pressure in the system.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| Silence, no humming | No power, thermostat burnt out | Check the socket, cable, thermostat |
| Humming and clicking | Faulty starting relay | Replace the starting relay ($10-50) |
| Humming without starting | Compressor jammed | Compressor replacement required |
| Works without stopping | Freon leak, breakdown sensor | Searching for leaks, refilling, replacing the sensor |
Replacing a compressor is a complex process that requires evacuation of the system and refilling freon of a certain type. It is impossible to carry out this procedure independently without special equipment (vacuum pump, pressure gauge station, scales).
Refrigerant leakage and system blockage
If the compressor runs continuously, hums, but there is no cold, and the condenser grille at the back remains cold, this is a sure sign freon leaks. The refrigerant could evaporate through a microcrack in the evaporator or in places where the tubes are soldered. Without a sufficient amount of gas, heat exchange does not occur.
Another option is clogged capillary tube. An ice or dirt blockage may have formed in the system, blocking the circulation of refrigerant. In this case, the compressor will also work without interruption, trying to pump gas, but there will be no pressure in the system. A characteristic sign is that the compressor is hot and cold only at the exit point; then the tubes remain warm.
To eliminate leaks, technicians use leak detectors and ultraviolet lamps with dye. After finding and eliminating the hole (by soldering), the system is evacuated and refilled. This is one of the most common reasons for contacting service centers.
⚠️ Attention: Freon itself is not consumed during operation. If your refrigerator runs out of gas, it means that the tightness of the circuit is broken, and this hole needs to be found and sealed, otherwise the new gas station will quickly evaporate.
Sometimes you can try to break through the blockage with hydraulic pressure, but this does not always help. More often, disassembling the system, purging with nitrogen and replacing filter-drierwhich could have become unusable is required.
Failures in the No Frost and defrosting system
In refrigerators with the system No Frost The reason for the lack of cold is often a malfunction of the defrost system. If the heating element, timer or defrost sensor fails, a huge “coat” of ice grows on the evaporator. This ice blocks the channels through which cold air should enter the chambers.
As a result, the fan hums, but there is no airflow. The compressor may operate normally, but you will not feel any cold. This can be seen visually if you remove the back panel in the freezer and see a solid piece of ice there.
☑️ Diagnostics of the No Frost system
To temporarily solve the problem, you can defrost the refrigerator completely, leaving it turned off for 24 hours. If after switching on the cold appears and lasts for several days, and then disappears again, the problem is definitely in the defrost unit. The burnt element needs to be replaced: most often it is Heating element or a sensor.
It is also worth checking the fan that circulates the air. If its wing is frozen or the motor is burned out, there will be no circulation. In some models, when the door is opened, the fan should stop - check the serviceability of the corresponding limit switch.
Electronic faults and control module
Modern refrigerators are crammed with electronics, and sometimes the cause of the failure is control module. Power surges in the network can damage the board tracks or “burn” the control triacs. In this case, signals from the sensors are not processed, and commands to start the compressor or fan are not received.
Symptoms may include chaotic readings on the display, flashing indicators, or a complete lack of response to button presses. Sometimes the module goes into protective mode and blocks the engine from starting. Diagnostics requires testing the board elements and checking the output voltage.
In some cases, flashing or a simple resetting errors (reset) helps, but if the element base is physically damaged, the board will need to be repaired or replaced. This is an expensive procedure, but often cheaper than buying a new unit.
Can you repair the board yourself?
If you have soldering skills and reading electrical circuits, you can replace burnt capacitors or relays. However, without experience, it is better not to get into the high-voltage part, so as not to aggravate the situation.
Pay attention to the condition of the wiring inside the case. Rodents or mechanical damage during transportation could have broken the wires going to the compressor or sensors. Visual inspection of the harnesses sometimes helps to find a break.
Frequently asked questions (FAQ)
Why is the refrigerator humming, but not freezing, and what to do?
If you hear a humming sound, but there is no cold, most likely the problem is a freon leak or a clogged capillary system or a faulty start relay. You need to listen: if the hum is intermittent and accompanied by clicks, change the relay. If it hums constantly and quietly, look for a leak.
Is it possible to operate the refrigerator if it has stopped freezing?
For a short time - yes, for example, to defrost it or wait for the technician. Constant operation of a faulty compressor (especially if there is an oil or freon leak) can lead to its complete combustion. It is better to turn off the device from the network.
How long does it take for the refrigerator to get cold after defrosting?
Usually it takes from 2 to 6 hours to reach the temperature, depending on the volume of the chambers and the ambient temperature. If after 8-10 hours of compressor operation the chambers are not cold, then there is a technical malfunction.
Why in a two-chamber refrigerator does one chamber freeze and the other not?
This may indicate a freon leak in the circuit of a specific chamber (if they are independent), a malfunction of the air-flow damper (in No Frost), or a problem with thermostat for this zone. In single-compressor models, the air supply channel is often clogged.