The situation when food in the freezer is petrified from cold, and in the main compartment there is room temperature, is one of the most common and frustrating problems with refrigeration equipment. This is a classic symptom that indicates a refrigerant circulation problem or a malfunction in the temperature control system. The owner of the unit is often at a loss, trying to understand why the equipment behaves so selectively, and whether it is worth calling a technician or can you handle it yourself.
Before you panic and look for the phone number of a service center, it is necessary to carry out an initial diagnosis that will help narrow down the range of possible causes. In modern models, especially those equipped with a system, a complex chain of components is responsible for the distribution of cold: from the compressor to the air dampers. If one of the elements of this circuit fails, the cold stops flowing into the upper chamber, remaining only in the evaporator area, which is usually located closer to the freezer. No Frost, a complex chain of components is responsible for the distribution of cold: from the compressor to the air dampers. If one of the elements of this circuit fails, the cold stops flowing into the upper chamber, remaining only in the evaporator area, which is usually located closer to the freezer.
In this article we will analyze in detail the mechanical and electronic causes of the malfunction, explain the physics of the processes and give clear instructions for identifying the breakdown. It is important to understand that ignoring a problem in its early stages can lead to food spoilage and more costly repairs in the future. Let's look at the main scenarios why refrigerator ceased to perform its functions, maintaining the functionality of only the freezer compartment.
Tightness failure and refrigerant leak
One of the most likely reasons why The refrigerator compartment is warm, but the freezer is cold, there is a partial leak of freon. When the amount of refrigerant in the system decreases, its pressure is no longer sufficient to cool the entire volume of the evaporator. Since the circulation of the refrigerant is often organized so that it first passes through the freezer, it gets the “lion’s share” of the remaining cold, while the gas simply does not reach the refrigerator compartment at the required temperature.
A leak can occur anywhere in the circuit: in the foamed parts of the body, in places where pipes are soldered, or through microcracks in the evaporator. Often, owners themselves damage the system by trying to defrost the unit with a knife or sharp object, breaking through the thin walls evaporator. In this case, the gas quickly evaporates, and the compressor begins to work without stopping, trying to increase the temperature, but to no avail.
⚠️ Attention: If you hear a hissing sound during defrosting or smell a specific smell, immediately unplug the device and ensure the room is ventilated. Self-refilling with freon is impossible without special equipment and skills.
It is rarely possible to visually diagnose a leak, since freon is a colorless and odorless gas. However, an indirect sign is the continuous operation of the compressor: it hums without turning off, trying to compensate for the lack of cooling capacity. In models with one compressor and one cooling circuit, this leads to the situation described: the freezer is still at minus, but in the refrigerator it is already +10...+15 degrees.
To accurately determine the location of the leak, technicians use leak detectors or the nitrogen pressure test method. If a violation of the tightness of the foamed circuit (tubes passing inside the walls of the housing) is confirmed, repair may not be economically feasible, since it requires the installation of an external evaporator (“crying chamber”) inside the chamber.
Faults in the No Frost system
In refrigerators with the system No Frost cold is generated in a separate hidden unit and is pumped to where it is needed using fans and air ducts. If the fan responsible for supplying air to the refrigerator compartment stops or does not work correctly, cold air remains in the freezer or in the technical compartment. This is the second most popular reason for temperature imbalance.
Often the problem lies in freezing of the air ducts. The automatic defrosting system may fail, and an ice plug will block the path. air masses. As a result, damperthe flow control cannot open completely, or the air physically cannot pass through the tunnel clogged with ice. It is cold in the freezer, since it is closer to the source of cold.
- ❄️ Fan malfunction: The blades could have frozen or the motor has failed, due to which caused the air circulation to stop completely.
- 🧊 Evaporator freezing: The defrost heating element has burned out, and ice builds up on the radiator, blocking the operation of the entire system.
- 🚪 Failure of the damper: A mechanism that opens and closes the access of cold air air into the chamber, stuck in the closed position.
You can check the operation of the fan by listening to the sounds inside the chamber after opening the door (on some models it should stop, on others, on the contrary, it will turn on). often solves the problem if it is caused by a temporary failure.
If after a long defrost the problem returns after a few days, it means that one of the elements of the defrost system has failed: the heating element, timer or defrost sensor. Diagnostics of these components requires “testing” with a multimeter for resistance. Replacing the burnt heating element or sensor usually restores the normal operation of the system.
Problems with the thermostat and temperature sensors
The electronics of the refrigerator rely on the readings of temperature sensors. If the sensor installed in the refrigerator compartment transmits incorrect data (for example, it tells the control unit that it is already cold there), the compressor will not turn on often enough or for a long time to maintain the mode. At the same time, the temperature in the freezer may drop naturally or be maintained by residual cold, creating. the illusion of normal operation.
In older models with mechanical control, thermostatis responsible for this. Its capillary tube may lose its seal, or the contacts inside the device may stick. As a result, the refrigerator “thinks” that the refrigeration cycle is complete and turns off the compressor, even if the food in the main chamber has already begun to deteriorate.
Modern models are equipped with air sensors, which often fail due to power surges or natural wear. A shift in readings even by a few degrees can lead to the refrigerator operating in an economical mode, which is insufficient to fully cool the large volume of the chamber.
⚠️ Attention: Replacing the temperature sensor requires accurate readings. selecting an analogue. Installing an element with a different resistance will lead to incorrect operation of the entire unit.
To check the mechanical thermostat, you can temporarily exclude it from the circuit (close the contacts), but this should be done carefully and only for diagnostics. If after this procedure the compressor starts working and the refrigerator starts to freeze normally, then the problem is in the regulator. In electronic control boards, diagnostics are carried out by reading error codes, which are often displayed on the display. or blinking indicators.
Clogged capillary tube
A less common, but possible cause is a clogged capillary tube. tubes. This is the thinnest copper channel through which freon is supplied to the evaporator. If there is moisture or oil breakdown products in the cooling system, they can freeze or accumulate in a narrow place, forming an ice or dirt plug.
When clogged, the refrigerant circulation is disrupted, and the pressure at the inlet of the compressor drops, and in this case it begins to work with overload. be produced unevenly: part of the evaporator will be cold and part will be warm. Since the freezer compartment is often structurally located closer to the beginning of the circuit or has a separate evaporator, it can remain cold while the refrigerator compartment is warm.
Only a specialist can diagnose this problem:
- 🔇 The compressor is working. quieter than usual or with periodic clicking (the thermal relay turns it off).
- 🌡️ The condenser grille at the back is only partially hot.
- 🧊 The evaporator in the freezer is unevenly covered with frost.
Removing the blockage requires purging the system with nitrogen under high pressure and replacing the filter drier. This is a complex technical procedure that cannot be performed at home without a vacuum pump and a filling station.
Failures in the compressor
The compressor is the heart of the refrigerator. If its performance has dropped, it cannot create enough pressure to pump freon throughout the entire circuit. In such cases, they say that the compressor “does not hold pressure.” Most often this occurs due to wear of the piston group or valves.
As a result, the compressor hums, works constantly, but does not create the required temperature difference. The freezer, as a more compact and better insulated compartment, can still hold a minus, but there is no longer enough power to cool the large volume of the refrigeration chamber. It is also possible that one of the cylinders of a two-compressor unit (if they are combined) works ineffectively.
| Symptom | Possible cause | Action |
|---|---|---|
| Buzzes, but does not start | Faulty starting relay | Replace the relay |
| Works constantly, does not freeze | Freon leak / Compressor wear | Master diagnostics |
| The case is very hot | Overload / Clogged capacitor | Cleaning / Repair |
| Clicks and turns off | Thermal relay / Compressor wedge | Replacement of parts |
It is important to distinguish the noise of a compressor from the sound of a faulty unit. If you hear knocking, clanging or metallic grinding noises, this may indicate mechanical failure of internal components. In this case, operating the equipment is dangerous and can lead to a fire or complete failure of the compressor.
How to check the starting relay?
Remove the relay from the compressor and shake it. If a knock is heard inside (as if from a broken stone), it means that the contacts are damaged and the relay must be replaced. This is a frequent and inexpensive breakdown.
The influence of operating conditions and user errors
Sometimes the reason lies not in the breakdown, but in improper operation. For example, if the door of the refrigerator compartment does not close tightly due to a deformed seal or the door is skewed, warm air constantly enters there. The compressor tries to compensate for the heat, working hard, but due to the constant flow of heat, the temperature does not drop to normal. In the freezer, the door can close more tightly, and the cold remains there.
The location of the products also plays a role. If you pack the shelves so tightly that they block the vents, cold air won't be able to circulate. In the system No Frost this is critical: the air must freely wash the products and return to the evaporator.
Another banal reason is setting the temperature regulator to the minimum value. The user may accidentally touch the thermostat wheel, and the refrigerator will switch to “low cold” mode.
⚠️ Attention: Do not place hot or warm foods in the refrigerator. This creates a sharp temperature difference, increases humidity and forces the compressor to work in extreme mode, which can cause freezing of the channels.
Check the rubber seals on the doors. Wipe them with clean water and inspect them for cracks or creases. If the rubber band lags behind the body, the main heat flow comes through this gap. A simple test with a sheet of paper clamped by the door will help identify leaky areas: if the sheet is easily pulled out, it means that the pressure is insufficient.
☑️ Diagnostics before calling a technician
When you need to call a technician
If after defrosting and checking the settings the problem does not disappear, most likely a professional repair is required. It is impossible and dangerous to fix a freon leak, replace the compressor or re-solder the electronics without experience and tools.
A technician is needed if:
- 🛠️ You find an oily spot under the refrigerator (a sign of a leak).
- 🔌 The compressor is humming, but not starts up, or constantly knocks out plugs.
- ❄️ After defrosting, the refrigerator worked for a day and stopped freezing again.
It is worth considering that repairing the cooling system is often comparable in cost to purchasing new equipment, especially if it is necessary to replace the compressor or restore a foamed circuit. Therefore, accurate on-site diagnostics will help make an informed decision on the advisability of restoring the unit.
Frequently asked questions (FAQ)
Why did the refrigerator work after defrosting, but after a week it stopped again?
This is a sure sign of a malfunction of the defrost system in No Frost models. Ice accumulated again and blocked the channels. The heating element, timer or defrost sensor has burned out. The faulty element needs to be replaced.
Is it possible to operate the refrigerator if the freezer is working but the refrigerator compartment is not?
For a short time - yes, but you can’t work like that for a long time. The compressor runs without stopping, which will lead to overheating and burnout of the windings. In addition, the food in the upper chamber will spoil.
How long does it take to defrost the refrigerator to check?
It takes at least 24 hours for the ice in the hidden channels and on the evaporator to completely thaw. Two hours will not be enough for the ice plug to completely melt.
Why is the back wall of the refrigerator compartment warm or hot?
In some models this is normal (No Frost system operation). If the wall is hot, but there is no cold, the capillary may be clogged or a freon leak has occurred, and the refrigerant is condensing in the wrong place.