The situation when you open the refrigerator door, and it’s warm there, like in a room, but This freezer works properly and freezes food, is one of the most common and frightening malfunctions. Many users immediately begin to look for a new unit or prepare for expensive repairs, but in a significant number of cases the problem lies in malfunctions of the refrigerant circulation system or control failures.
Understanding the operating principle of your device, be it classic drip system or modern No Frost, will help you quickly diagnose the problem and make the right decision about calling a technician. It is important not to ignore the first signs, since long-term storage of products in incorrect conditions can lead to spoilage of stocks and the proliferation of bacteria.
In this article we will analyze in detail the main reasons why cold stops flowing into the main compartment, consider self-testing algorithms and point out those malfunctions that require professional intervention. You will learn how to distinguish a banal defrost from a serious freon leak.
Features of the No Frost and drip defrosting system
To understand why the temperature regime was disrupted, it is necessary to distinguish between the design features of different types of refrigerators. In devices with the system No Frost cold is generated in the evaporator, which is most often located behind the rear wall of the freezer, and then the fan forces cooled air into the remaining compartments through special air ducts. If the main compartment is warm, this often indicates that the air flow is blocked or stopped.
In models with drip system (crying evaporator), the process is different: the evaporator is located in the wall of the main refrigerator compartment, and the cold spreads by natural convection. The freezer compartment in such models usually has its own separate circuit or a more powerful evaporator. Loss of cold in the upper compartment when the freezer is running may indicate problems with the thermostat or contamination of the channels.
It is worth noting that in two-compressor models, each circuit operates independently, and the failure of one compressor (usually responsible for the refrigeration chamber) will lead to exactly the problem described. In single-compressor models, where one motor serves both circuits, the reason most often lies in blockages or leaks.
How to determine the type of system without instructions?
Look into the freezer. If there is no ice or snow coat on the back wall, but only holes or a grate are visible, this is No Frost. If an ice crust periodically forms on the wall, which then melts, this is a drip system.
Tightness failure and refrigerant leak
One of the most serious reasons why the cold in the main chamber has disappeared is freon leak. The refrigerant is the working fluid that circulates through the system, picking up heat. If a microcrack has formed in the circuit (often in the foamed part of the case or in soldering areas), the gas gradually evaporates. First of all, there is no longer enough pressure on the distant sections of the circuit, which is the refrigeration compartment, while the freezer located closer to the compressor still continues to freeze.
The leakage process can be slow. At first, you may notice that the compressor starts working longer and almost never turns off, trying to reach the set temperature. Then, local heating areas or, conversely, cold areas may appear on the rear grille of the condenser, which indicates a violation of gas circulation.
⚠️ Attention: You can independently search for leaks using a soap solution only on accessible components (condenser, compressor). If freon leaves through a leaky circuit in the wall, you will not see anything, and an attempt to “solder” without evacuation and replacing the filter-drier will only finish off the compressor.
Diagnostics of a leak requires the use of special equipment: a leak detector, a pressure gauge station and nitrogen for pressure testing. The symptom of a leak is often a completely cold or barely warm condenser (grid at the back) while the compressor is runningwhich indicates the absence of freon in system.
Faults of sensors and thermostat
The electronics of a modern refrigerator controls all processes, relying on sensor readings. If temperature sensor the refrigeration chamber is out of order and transmits incorrect data (for example, that it is already -10°C, although in fact it is +15°C), the controller simply will not give the command to cool. As a result, the freezer operates according to its own algorithm, and the main compartment is warm.
In models with mechanical controls thermostat. Its capillary tube may lose sensation or become dislodged. You can check it by closing the contacts directly (for diagnostics), but this should be done carefully, remembering the voltage in the network.
It is also worth checking air duct damper (damper). In No Frost refrigerators, cold air is supplied from the freezer through a channel controlled by a damper. If the damper drive is stuck in the closed position or the motor is burned out, air simply does not enter the refrigeration compartment.
Problems with the fan and freezing of the evaporator
In systems No Frost the proper operation of the fan is critically important. It is he who drives cold air through the chambers. If the fan blades are covered with ice and jammed, or the electric motor burns out, circulation stops. The cold remains in the evaporator area (in the freezer), but does not enter the refrigerator compartment.
Often the fan stops due to freezing. This happens if the defrost system is faulty: Evaporator heating element, defrost sensor or the timer. Ice blocks not only the fan, but also the air duct itself leading to the refrigerator compartment. Visually, this may look like ice on the floor of the freezer or a “fur coat” behind the rear panel.
- ❄️ The fan may hum, but not spin due to ice on the blades.
- 🔌 A burnt-out fan motor requires a complete replacement of the unit.
- 🧊 The frozen air supply channel must be defrosted for at least 24 hours.
☑️ Fan diagnostics
If you hear that the fan is trying to start, it makes a sound, but then it stops, most likely it is trapped in the ice. In this case, it is necessary to completely defrost the refrigerator while it is turned off.
Clogged capillary tube
Another technical reason why there is no cold in one compartment is clogging of the capillary tube. During operation, plugs of paraffin or debris (products of oil and freon breakdown) may form in the system. A blockage most often occurs at the narrowing of the tube before entering the evaporator.
When a blockage occurs, the circulation of the refrigerant is disrupted. The compressor tries to pump freon, creating high pressure in front of the plug, but the gas does not flow into the evaporator of the refrigeration chamber or does not flow in sufficient quantities. The freezer compartment that has priority in the cycle or is located closer may maintain a low temperature while the main compartment heats up.
| Symptom | Probable cause | Action required |
|---|---|---|
| The compressor is hot, running without stops | Capillary clogged or leak | Call a technician to purge with nitrogen |
| A gurgling sound is heard in the tubes | Lack of freon or plug | Diagnostics of pressure in the system |
| The condenser heats up unevenly | Partial blockage of the system | Washing the circuit and replacing the filter |
| The refrigerator turns off without reaching the temperature | Thermal protection has tripped | Checking the compressor and start relay |
Remedy clogging is a complex procedure that requires vacuum the system, flushing with a special solution or nitrogen, as well as mandatory replacement of the filter-drier. Without this, a new blockage will form very quickly.
⚠️ Attention: Do not try to clean the capillary tube yourself by pumping liquid into it with a syringe. You can damage the thin walls of the tube or drive dirt deeper into the system, which will make repairs economically unfeasible.
Compressor wear and loss of performance
Although the compressor is the “heart” of the refrigerator, its wear does not always mean a complete stop. The motor may hum and vibrate, creating the illusion of normal operation, but its performance may be critically low. It is simply not able to create the necessary pressure to push freon through the entire circuit to the fridge compartment. residual capacity may be critically low. It is simply not able to create the necessary pressure to push freon through the entire circuit to the fridge compartment.
In such cases, the freezer still keeps the cold due to a smaller volume and more efficient heat exchange in this zone, but the compressor resource is no longer enough to reach the main compartment. This often happens with old models or units that have been operating for a long time under overload (for example, in a hot room or with a door that is not tightly closed).
Check the compressor Only a master can use pressure gauges to measure the discharge pressure. If it is significantly below the norm, it is necessary to replace the unit with one of a similar power and refrigerant.
Operating rules and breakdown prevention
Many problems that lead to a lack of cold can be prevented by following simple operating rules. Excessive loading of chambers with products disrupts air circulation, especially in models No Frost. If you have covered the ventilation holes with food, the cold simply will not be able to get into the desired area.
Regular defrosting (even for No Frost systems is recommended once a year) helps remove an invisible layer of ice in hard-to-reach places, which over time turns into an ice plug. It is also important to monitor the condition of the door seals: if they do not fit tightly, warm, moist air enters the chamber, causing increased freezing and stress on the compressor.
- 🌡️ Do not set the temperature lower than necessary (optimally +3...+5°C).
- 🚪 Do not leave the door open longer 1-2 minutes.
- 🧹 Keep the condenser grille at the back clean (dust impairs heat transfer).
Remember that the correct distance from the wall to the back wall of the refrigerator (minimum 5-10 cm) ensures the necessary air flow to cool the compressor and condenser. Violation of this rule leads to overheating and reduced efficiency of the entire system.
Frequently asked questions (FAQ)
How long does it take for the refrigerator to get cold after defrosting?
Usually it takes from 2 to 8 hours to reach the temperature, depending on the volume of the chamber and the temperature in the room. It may take up to 24 hours for the compressor to fully stabilize and shut down for the first time. Do not load food into an empty refrigerator immediately - this will increase the time it takes to reach the mode.
Why does the refrigerator click but does not turn on?
Clicks can be made by the compressor start relay (attempt to start) or temperature relays. If the clicks are frequent, but there is no cold, the start relay may have burned out, the compressor has jammed, or the protection has tripped due to overheating. Diagnostics of the electrical circuit is required.
Is it possible to use the refrigerator if the upper chamber does not freeze?
For a short time - yes, if you store products there that do not require strong cooling. However, long-term operation in this mode is harmful for the compressor, which will work continuously, trying to reach a non-existent temperature, which will lead to its overheating and eventual failure.
What to do if after defrosting the cold still does not appear?
If after 24 hours of defrosting and turning on the network the cold does not appear, the problem is of a technical nature (leakage, blockage, electronic failure). You can’t fix this on your own; you need to call a specialist to fill with freon or replace components.