The situation when the refrigerator has stopped freezingoften takes you by surprise, threatening food spoilage. The first thing you should do is not panic or immediately call a specialist, since in half of the cases the problem is solved without expensive intervention. It is necessary to carry out initial diagnostics to understand whether this is an electronics failure, a violation of operating rules, or a serious breakdown of the unit.
Modern models, be it Liebherr, Indesit or Atlant, have similar principles of operation, but can work differently respond to external factors. If you notice that the ice is melting in the freezer compartment, but it is warm in the refrigerator compartment, you need to immediately check the thermostat settings and the integrity of the seals. Often, users accidentally reset the modes or forget to close the door tightly after loading products.
In this article we will analyze a step-by-step algorithm of actions that will help identify the cause of the malfunction. You will learn how to distinguish between a temporary failure and a need replacing the compressor or finding a refrigerant leak. A careful study of the symptoms will allow you to make the right decision on further actions.
Primary diagnosis and simple causes
Before disassembling the equipment, you need to eliminate trivial errors. If the refrigerator doesn't freezebut still works and makes the usual sounds, check the temperature in the room. In the summer heat or when working near heating devices, the unit may not be able to cope with the heat flow. Make sure that the necessary clearance is left around the case for ventilation.
The second common reason is a loose door fit. Over time, the rubber seal dries out, gets dirty or becomes deformed. If warm air penetrates through the gap, the system automatic defrosting (No Frost) may not have time to remove moisture, which leads to the formation of an ice coat and blocking of air channels.
- 🔍 Check whether the thermostat has moved to the “Off” position or "0".
- 🚪 Inspect the seal for cracks, tears and dirt.
- ❄️ Make sure that food does not block the cold air outlets.
⚠️ Attention: If you have just defrosted the refrigerator and turned it on, do not load food right away. The unit takes from 2 to 6 hours to reach operating temperature in an empty chamber.
It is also worth paying attention to the position of the equipment. If the floor is uneven or the legs are weak, the door may not close completely on its own. In models with a system No Frost this is critical, as air circulation is disrupted. Check the installation level with a building level or simply visually assess the skew of the case.
Checking the thermostat and temperature sensor
If external factors are excluded, the next in line is the climate control electronics. Thermoregulator (thermostat) is a device that commands the compressor to turn on when the temperature in the chamber rises above the set value. If it is faulty, the compressor may simply “not know” that it is time to cool the food.
In more modern models, instead of a mechanical thermostat, thermal sensors (thermistors) are used. They transmit a signal to the electronic control module. If the sensor fails, error codes may appear on the display, or the refrigerator will operate in emergency mode or not turn on at all.
To check a mechanical thermostat, it is often necessary to dismantle it. It is usually located inside the refrigerator compartment or under a plastic panel. If you don’t hear a characteristic click when you turn the handle, there is a high probability of it breaking. However, it is better to carry out accurate diagnostics with a multimeter, checking the “continuity” of the contacts.
- 🔧 Try knocking on the thermostat: sometimes the contacts stick.
- 🌡️ Compare the sensor readings with the actual temperature (using an external thermometer).
- ⚡ Check the integrity wires going to the sensor for breaks or cuts.
How to check the thermostat with a multimeter?
To check, remove the thermostat and lower its sensitive tube into a container with water at room temperature. Call your contacts - they should ring. Then put the handset in ice water - the contacts should open (stop ringing). If this does not happen, the part requires replacement.
It is important to understand that replacing a thermostat is a simple procedure, but requires care. When installing a new part, you must ensure that the capillary tube is not kinked and is correctly positioned in the chamber. Incorrect installation can lead to incorrect operation of the refrigerator in the future.
Problems with the defrosting system (No Frost)
In refrigerators with the system No Frost a frequent reason for the lack of cold is a failure in the defrosting cycle. The evaporator, hidden behind the rear wall, becomes covered with ice, which blocks the fan and air supply channels. As a result, the cold simply does not enter the chamber, although the compressor can operate continuously.
Three main elements are responsible for the defrosting process: Evaporator heating element, timer (or electronic module) and defrost sensor. If any of them fails, the ice does not melt, but grows. Over time, a block of ice can block the fan blades, and you will hear a characteristic crackling or hum.
| System element | Function | Malfunction sign |
|---|---|---|
| Defrost heating element | Heats the evaporator to melt the ice | The ice does not melt, the heating element is cold when turned on |
| Defrost sensor | Turns off the heating element when a certain temperature is reached | The defrost does not turn on or does not turn off on time |
| Fan | Cold air circulates | Noise, crackling, lack of airflow |
To eliminate this problem, it is often enough to completely manually defrost the refrigerator within 24 hours. If, after switching on, the problem recurs after 1-2 weeks, it means that one of the elements of the defrosting system is faulty and requires replacement. This can be checked visually by removing the back panel in the freezer.
☑️ Diagnostics of the No Frost system
It is worth noting that in models of different brands, such as LG or Samsung, access to the evaporator may differ. In some cases, complete disassembly of the freezer is required. Be careful with plastic elements, as they become brittle in the cold.
Faulty compressor and start relay
Compressor is the “heart” of the refrigerator, creating pressure for freon circulation. If it does not start, hums but does not pump, or turns on for a couple of seconds and immediately turns off, the problem may be in the start relay or the motor itself. The starting relay is a small part that supplies a starting impulse to the motor winding.
Often the relay is the cause of the failure. It can burn out due to power surges or normal wear and tear. Replacing this part is inexpensive and can be done fairly quickly. If, after replacing the relay, the situation does not change, and the compressor gets very hot or makes a metallic knock, it is likely that interturn short circuit or jamming of the piston group has occurred.
- 🔊 Listen: a smooth hum is normal, a metallic clang is normal. a sign of breakdown.
- 🔥 Touch the compressor housing: it should be warm, but not hot.
- ⚡ Check the network voltage: if the voltage is low, the compressor may not start.
⚠️ Warning: If you hear a click followed by a hum, followed by another click and silence a few seconds later, this is a classic symptom of a bad start relay or compressor. Do not try to turn on the refrigerator repeatedly, this may completely burn the winding.
In the case of inverter compressors, diagnostics are more difficult, since they are controlled by a special board (inverter). Voltage surges can damage the inverter module itself. In such cases, it is better not to experiment without professional equipment and knowledge.
Freon leakage and blockage of the capillary system
If the compressor runs continuously without turning off, but there is no cold, and the condenser (grid at the back) remains only partially cold or warm, most likely freon has occurred. Freon circulates in a closed circuit, and if it evaporates, cooling becomes impossible. Leaks often occur in the foamed part of the case or at solder joints. refrigerant leak (freon). Freon circulates in a closed circuit, and if it evaporates, cooling becomes impossible. Leaks often occur in the foamed part of the case or at solder joints.
Another common problem is clogging of the capillary tube. An ice plug or blockage with oil and copper oxidation products could have formed in the system. This prevents normal gas circulation. Visually, this is manifested by the fact that the filter drier may become covered with frost, and the condenser does not heat up evenly.
To eliminate these faults you need to:
- Find the location of the leak (often using a leak detector or soap solution).
- Solder the damaged area or replace the circuit.
- Replace the filter drier and evacuate the system.
- Fill the refrigerator with new freon strictly by weight.
It is impossible to eliminate a leak or blockage on your own without special equipment (vacuum pump, pressure gauge station, freon cylinder). Attempts to “top up” the gas without eliminating the cause will only temporarily alleviate the situation, but after a short time the problem will return.
When you need to call a specialist
Despite the possibility of self-diagnosis, there are a number of situations when the intervention of a specialist is inevitable. If you have checked all the simple reasons, disassembled the defrosting system, but the refrigerator Indesit or Bosch still does not freeze, the problem lies in the hardware.
This is especially true for work related to a sealed circuit. Opening the system requires a license and skills. A master is also needed if the compressor needs to be replaced, since this process involves soldering copper tubes and complex refueling.
Main signs of the need for service:
- 🛠️ Soldering of copper tubes and working with gas is required.
- 📉 Compressor works, but does not create pressure (checked by a technician).
- 💧 Oily stains have appeared inside or under the refrigerator (a sign of a leak).
⚠️ Attention: A warranty for compressor repair or replacement of freon, performed by an unqualified specialist or independently, is usually not provided. Keep receipts and certificates of work performed from authorized centers.
It is also worth considering the age of the equipment. If your refrigerator is more than 10-12 years old and requires expensive repairs (replacement of the compressor, foamed evaporator), it is often more economically feasible to consider purchasing a new model than investing in the resuscitation of the old unit.
Prevention and proper care
To prevent the question “why the refrigerator stopped freezing” from suddenly arising, it is important to follow the operating rules. Regular defrosting (even for the No Frost system, a preventative shutdown is recommended once a year) prolongs the life of the compressor. Keep the rear condenser grill clean - dust and animal hair impair heat transfer, causing the motor to wear out.
Do not place hot foods in the chamber. This puts excess stress on the system and leads to the formation of excess moisture, which freezes and disrupts the operation of the sensors. Also, do not overcrowd the freezer: free space is needed for air circulation.
Use only original spare parts when replacing faulty ones elements. Cheap analogues of thermostats or relays may not correspond to the exact parameters of your model, which will lead to incorrect operation of the entire system in the future.
Why does the refrigerator work, but does not freeze after defrosting?
Often after defrosting in the No Frost system, water remains in the drainage hole, which freezes and blocks the channel. Or the defrost heating element burned out, which was not checked. It is also possible that moisture gets on the contacts of the sensors.
Is it possible to operate a refrigerator if it does not freeze well?
For a short time - yes, but this is harmful for the compressor, which is working at the limit. In addition, bacteria actively multiply in the “warm” zone. Products can go bad, even if they look normal on the outside.
How often do you need to change freon in the refrigerator?
Freon is a working fluid in a closed circuit. If the system is sealed, it never needs to be replaced. If the freon has evaporated, then there is a leak that needs to be found and repaired before refilling.
Why is there ice in the freezer, but warm in the refrigerator compartment?
This is a classic sign of a violation of air circulation (the channels are clogged with ice) or a freon leak. In two-compressor models, this may mean failure of one of the compressors or thermostats.