The situation when the refrigerator has stopped freezingalways takes you by surprise, threatening damage to a large stock of products. Owners of modern equipment, such as Liebherr or Bosch, are often faced with the fact that the unit continues to work, hum and even glow inside, but the temperature in the chambers is rapidly rising. This may indicate either a banal capillary blockage or a serious one. In this case, it is necessary to quickly determine why the device does not gain cold in order to minimize losses. compressor failure. In this case, it is necessary to quickly determine why the device does not gain cold in order to minimize losses.
The first thing to do if you notice that the refrigerator does not freezeis to listen to the operation of the motor. Is it working normally, or is it starting too often at short intervals? It is also important to check whether something is blocking the air supply dampers in models with the system No Frost. Often the cause is a simple overload of the chambers or incorrect installation of the thermostat, which can be easily corrected yourself without calling a technician.
If a visual inspection and checking the settings do not produce results, you will have to carry out a more in-depth diagnosis. Freon leak or failure of the electronics requires professional intervention, but you can understand the nature of the breakdown and on your own. Below we will analyze in detail the main scenarios why your refrigerator has stopped performing its main function, and what steps to take first.
Primary diagnostics: analysis of compressor operation and noise
When the refrigerator has stopped freezing, the first indicator of the problem is the nature of the engine. In good condition, the compressor operates cyclically: it turns on, builds up pressure, and turns off when it reaches the set temperature. If the engine hums constantly, but there is no cold, this is a sure sign that the refrigerant circulation is disrupted. The compressor may run idle if a plug has formed in the system or a gas leak has occurred.
If the compressor does not start at all, and only a quiet click is heard, the problem may lie in the starting relay This small element is responsible for supplying current to the motor windings. If the relay has burned out, the motor does not receive an impulse to start. It is also worth paying attention to the temperature of the compressor housing: if it is hot to the point where it is impossible to touch it with your hand, this indicates an overload or mechanical jamming of the piston group.
⚠️ Attention: If you smell burning or see sparking in the compressor area, immediately disconnect the device from the network. Further operation may lead to fire or complete burnout of the motor windings.
Diagnostics should begin by checking the voltage in the network. Electricity surges often lead to electronics blocks the start for safety reasons. In models with inverter motors, for example LG or Samsung, the problem may lie in the control module, which stops sending the correct signals to the motor.
Problems with refrigerant: freon leaks and blockages
One of the most common reasons why the refrigerator has stopped freezingis the loss of circuit tightness. Freon is a working fluid that, circulating through the system, takes heat from the chambers. If a microcrack has formed in the tubes, the gas gradually evaporates. First, the efficiency drops, the device begins to work longer, and then the cold ceases to be produced completely. It is difficult to determine a leak visually, since freon is colorless and odorless.
The second option for problems with the refrigerant is clogged capillary tube. Not only gas circulates in the system, but also oil, which lubricates the compressor. Over time, clots may form in the oil, or moisture may enter the circuit, which at low temperatures turns into an ice plug. This blocks the flow of freon, and the pressure in the system dropswhich causes the refrigeration capacity to disappear.
The symptoms of these problems are often similar: the compressor works, but the condenser (grid at the back) remains cold or warm only partially. In normal condition it should be evenly hot. If you notice that heating occurs only at the beginning of the grilleand then the tube is cold, this is an almost guaranteed sign of a blockage or leak.
Is it possible to fill the refrigerator yourself?
Self-filling with freon is highly not recommended without special equipment. It requires evacuation of the system, precise dosage of gas and oil, as well as searching for the leak. Unprofessional refilling can lead to a compressor explosion or fire due to the ignition of some types of refrigerants upon contact with air.
Faults in the defrosting system (for No Frost models)
In refrigerators with a system No Frost lack of cold is often associated with a breakdown of the system defrost. The operating principle of such devices involves periodic switching on Defrost heating elementwhich melts the ice on the evaporator. If this process is disrupted, the ice builds up so much that it blocks the cold air supply channels. As a result, the fan hums, the compressor works, but no cold enters the chamber.
The key elements of this system are the defrost timer (or electronic module), the defrost sensor and the heating element itself. If The heating element has burned out, the ice does not melt. If the sensor is faulty, it may not give a command to turn on the heating or, conversely, may not turn off the heating element on time. Visually, this manifests itself in the form of a “coat” of ice, which can be seen when you reach the evaporator behind the back wall of the freezer.
Often owners notice that the refrigerator has stopped freezing after defrosting has not been carried out for a long time. In such cases, it is enough to completely defrost the unit for 24 hours so that the ice melts and the water goes into the drainage. If, after putting it back into operation, the problem returns after 1-2 weeks, it means that one of the elements of the defrosting system requires replacement.
☑️ Diagnostics of the No Frost system
Failure of the thermostat and temperature sensors
The thermostat (thermostat) is the “brain” that controls turning the compressor on and off in mechanical models. If The thermostat is faulty, it may not send a signal to start the motor, even if it is warm in the chamber. As a result, the refrigerator is turned off, the food is melting, and the light is on inside. You can check it by closing the contacts directly: if the compressor starts working, then the problem is in the regulator.
In modern models with electronic control, the role of the thermostat is performed temperature sensors. There may be several of them: in the freezer, in the refrigerator compartment, on the evaporator. If one of the sensors gives incorrect readings (for example, it “thinks” there is cold, although there is none), the control module will not start the compressor. Often, a break in the sensor circuit leads to an error code appearing on the display.
Replacing the thermostat is one of the simplest procedures do-it-yourself repairs. However, it is important to choose an analogue with exactly the same characteristics, otherwise the operating modes may go wrong. For electronic sensors, the accuracy of calibration is critical, so after replacement, sometimes it is necessary to reset errors through the service menu.
⚠️ Attention: When replacing the thermostat in mechanical refrigerators, make sure that the bellows tube (sensing element) fits tightly to the evaporator or is correctly installed in the seat. Inaccurate installation will result in incorrect temperature reading.
Table: Main symptoms and probable causes
To quickly navigate the problem when The refrigerator has stopped freezing, use the following table for the primary classification of the malfunction. This will help you understand whether it is worth calling a technician or whether the problem can be solved yourself.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| Compressor hums, but does not start (clicks) | Malfunction of the starting relay or windings | Low (replacement of the relay) |
| The motor runs constantly, there is no cold | Freon leak or blockage capillary | High (needs a technician) |
| Ice in the freezer, warm in the refrigerator compartment | Malfunction of the defrost system (No Frost) | Medium |
| The refrigerator does not turn on at all | Problems with the wiring, socket or thermostat | Low/Medium |
| The sound of liquid flowing is heard, there is little cold | Lack of freon in system | High (needs refueling) |
The influence of door seals and operating rules
Sometimes the reason that the refrigerator does not freezelies not in technology, but in violation of operating rules. If the door does not close tightly due to worn or skewed hinges, warm air constantly enters the chamber. The compressor tries to compensate for the heat by working non-stop, but cannot cope with the load. Over time, this leads to overheating and breakdown. seal or the hinges are skewed, warm air constantly enters the chamber. The compressor tries to compensate for the heat by working non-stop, but cannot cope with the load. Over time, this leads to overheating and failure.
You can check the tightness using a sheet of paper: clamp it in different places of the closed door. If the sheet comes out too easily, it means the seal is broken. It is also worth checking whether anything is preventing it from closing tightly: protruding food, dishes, or the distortion of the refrigerator itself on the floor.
In addition, frequently opening the door or placing hot food inside creates excess stress. Moisture from the air instantly condenses and freezes, which is especially critical for systems No Frost. Remember that the maximum load of the chambers should not exceed 70% of the volume so that the air can circulate freely.
When you need to call a technician: critical breakdowns
There are a number of situations when attempts do-it-yourself repair can be not only useless, but also dangerous. If diagnostics indicate a freon leak, special equipment is required to find the location of the depressurization, solder the tubes and evacuate the system. It is impossible to carry out these operations efficiently on your own.
You should also contact a specialist if the compressor itself has failed. Replacing the “heart” of a refrigerator is a labor-intensive process that requires overhauling the entire refrigeration system, replacing the filter drier, and accurately refilling with oil and gas. Inept actions can lead to the fact that the new motor burns out in a few days.
⚠️ Attention: Modern refrigerators often contain refrigerants that require licensed handling. An attempt to independently interfere with a sealed circuit may void the manufacturer's warranty, if it is still valid.
If you are not confident in your abilities or diagnostics show complex electronic malfunctions, it is better to trust the professionals. Repairing complex household appliances, such as Siemens or Whirlpool, often requires original spare parts and knowledge of the specifics of service codes.
Why does the refrigerator work, but does not freeze after defrosting?
If after complete defrosting (more than 24 hours) the refrigerator turned on, worked for a couple of hours and stopped freezing again, most likely the problem is a clogged capillary tube or a freon leak. During defrosting, the ice at the site of the micro-leak or plug melts, the system temporarily begins to work, but when the mode returns, the problem returns. It is also possible that the thermostat fails because it does not “see” the temperature increase.
Can a refrigerator stop freezing due to a power surge?
Yes, a power surge could lead to burnout of the start relay, damage to the compressor windings, or failure of the electronic control module. Modern models often have protection that blocks startup when the voltage is unstable. In this case, completely disconnecting from the network for 15-20 minutes to reboot the electronics can help.
What to do if ice has frozen in the No Frost refrigerator on only one side?
Local ice freezing often indicates a malfunction of the defrost system. Ice may have blocked one of the air channels. It is necessary to defrost the unit, and then check the heating element, defrost sensor and timer. If one of these elements does not work, the ice will build up again, blocking the air circulation.
How to understand that the refrigerator has run out of freon?
If freon leaks, the condenser (grid at the back) will be cold or barely warm, while in good condition it is hot. In this case, the compressor can work without stopping. Another sign may be the absence of the characteristic noise of flowing liquid when turning the motor on and off.