The situation when you open the refrigerator door, and it is warm inside, while the lower chamber (freezer) continues to freeze food properly, this is a classic sign of a serious malfunction of the cooling system. This behavior of equipment is typical both for old Soviet units and for modern models with a No Frost or static cooling system. In most cases, this indicates that the refrigerant has stopped circulating throughout the entire circuit or the heat transfer in the upper compartment has been disrupted.
There is no need to panic right away, but you should not hesitate to diagnose. Products in the main chamber can deteriorate in a matter of hours, especially in the summer. Primary diagnostics will help you understand whether you can deal with the problem yourself or whether calling a specialist is already inevitable. Often the reason lies in a banal depressurization or electronics failure, but sometimes a complete replacement of units is required.
In this article we will analyze in detail the mechanics of the process, explain why the cold stops flowing upward, and give a clear algorithm of actions. You will learn how to distinguish a freon leak from a compressor breakdown and what to do if the equipment stops freezing in the middle of the night. It is critically important not to defrost the unit forcibly (with a hairdryer or hot water), as this can lead to irreversible damage to the evaporator.
The principle of operation of the cooling system and the role of freon
To understand the essence of the problem, you need to briefly refresh your memory on the principle of operation of the refrigeration circuit. Cooling occurs due to the circulation of refrigerant (freon) through a closed pipeline. The compressor compresses gaseous freon, increasing its pressure and temperature, after which it enters the condenser (grid at the back), where it cools and turns into liquid.
Next, the liquid refrigerant passes through the capillary tube and enters the evaporator, where it expands sharply and boils, absorbing heat from the refrigerator chambers. In two-chamber models, the evaporator is most often located in the freezer compartment. The cold from there is transferred to the main compartment either due to natural convection (in static models), or forcefully, using a fan (in systems No Frost).
Freon leak this is the most common cause of the described symptoms. When there is little gas in the system, it is only enough to cool the first section of the circuit - the evaporator in the freezer. The refrigerant simply does not reach the upper chamber in the required volume or condition, so the temperature remains there positive.
⚠️ Attention: Freon is odorless and colorless. If you smell a strange chemical smell, it could be an oil leak from the compressor or a plastic smell from overheating, but not the refrigerant itself.
The circulation process is disrupted gradually. First, the refrigerator starts working longer, trying to gain temperature, then the compressor may stop turning off altogether. If you ignore these signs, the equipment will fail completely. It is important to understand that freon is not consumed during operation, like gasoline in a car: if there is not enough of it, it means that the tightness of the circuit is broken.
Main causes of malfunction in two-chamber models
Diagnostics begins with an analysis of symptoms. Malfunctions can be divided into three large groups: problems with the refrigerant, mechanical failures of the compressor and failures in the control system (electronics). Depending on the type of control (electronic or electromechanical), the symptoms may differ.
In models with electronic control (where there is a display), the problem is often reported. indicates an error code. For example, y Liebherr or Bosch this can be a combination of letters and numbers indicating a specific sensor. In simple models with a thermostat knob, the indicator is only the behavior of the compressor and the temperature of the products.
Let's consider the main scenarios breakdowns:
- 🧊 Freon leakage: The freezer freezes weakly or in the “super-freezing” mode, the upper chamber is warm. The compressor is constantly humming.
- 🔧 Compressor malfunction: The unit hums, clicks, but does not start, or only one motor winding works, creating insufficient pressure.
- ❄️ Capillary tube clogged: There is freon, but it cannot circulate due to a plug of oil or debris. The symptoms are similar to a leak.
- 💨 Problem with the fan (No Frost): The compressor is working, there is no freon. place, but cold air is not pumped into the upper chamber due to a stopped fan or ice in the duct.
It is difficult to determine the exact cause “by ear” or by external signs. However, if you notice that the condenser (grid at the back) is only half hot or completely cold when the motor is running, this is almost guaranteed. indicates leak or clogging.
What is a capillary tube?
A capillary tube is a very thin copper pipe that serves as a choke in the refrigeration system. a sharp drop in freon pressure before entering the evaporator. The diameter of the tube is a fraction of a millimeter, so it becomes clogged with wear products of the compressor oil or moisture.
Diagnostics of freon leaks and problems with the compressor
If the refrigerator has stopped freezing in the upper compartment, the first thing you need to do is check the condition of the compressor and the presence of refrigerant. Freon leakage is the leading cause of such a breakdown. Microcracks can appear in the foamed part of the housing (inside the walls), in the evaporator (especially if it was accidentally pierced with a knife during defrosting) or in the places where the pipes are soldered.
How to check for the presence of freon without tools? Carefully (be careful, you can get burned!) touch the condenser grille on the back of the refrigerator. has been running for 15-20 minutes, the grate should be warm or hot over the entire area. If it is warm only at the outlet of the compressor, and then cold, there is little or no freon.
Problems with compressor the motor may hum, try to start, click (the thermal protection relay is working) and turn off. the starting relay is faulty or the compressor piston itself is jammed. In some cases, the compressor works, but does not create the required pressure due to exhausted valves.
| Symptom | Probable cause | Nature of operation motor |
|---|---|---|
| The freezer is freezing, the top is warm | Freon leak | Works without stopping |
| Both chambers are warm | Complete leak or compressor failure | Does not turn on or clicks |
| Frost only at the entrance to the evaporator | Clogged capillary tube | Operates with overheating |
| Uneven cold | Fan malfunction (No Frost) | Cyclic switching on |
If you find that the compressor is hotter than usual (burns your hand) and the refrigerator is not cooling, most likely there is a circulation problem. In this case, independent repair is impossible: you need to call a technician with a vacuum pump, a pressure gauge station and a supply. freon.
Faults in the No Frost and defrost system
In refrigerators with system No Frost adds another critical element - the fan and defrost system. If the freezer is working and it is warm in the refrigerator compartment, it is often the fan that is to blame, which is supposed to drive cold air from the freezer up. If it stops, the cold remains below, and the upper chamber heats up.
The second common problem is malfunction of the defrost system. It consists of a heating element, a defrost sensor and a timer (or electronic module). If the heating element burns out or the timer gets stuck in cooling mode, a coat of ice builds up on the evaporator in the freezer. Over time, ice completely blocks the air duct channels, and the fan (even if it is working) cannot drive air into the upper chamber.
How to check? In models No Frost you need to get to the evaporator (usually the back wall of the freezer). If you see a huge lump of ice there, and there is barely any blowing or no blowing from the air supply holes into the refrigerator compartment, there is a problem with defrosting. In such cases, it is often necessary to replace the evaporator heating element or sensor.
- 🔊 Noise or lack thereof: If the fan is working properly, you should hear a characteristic air noise. If there is silence, although the compressor is humming, the fan is not spinning.
- 🧊 Ice in the channel: Sometimes ice does not form on the evaporator itself, but in the transition channel between the chambers, blocking the flow.
- ⏱️ Cyclicity: If the defrost timer malfunctions, the refrigerator may freeze normally for several days, and then stop until the ice melts (naturally).
For diagnostics of electronics in modern models Samsung, LG or Indesit entrance is often required into service mode. This allows you to forcibly turn on the defrost heating element or fan and check their functionality without disassembling the housing.
⚠️ Attention: When defrosting the system No Frost do not use sharp objects to chip ice to check! You risk breaking the evaporator channels, and then repairs will become economically unfeasible. Use only warm air (hairdryer with caution) or natural defrosting.
Problems with thermostat and dampers
In some refrigerator models, especially those with one compressor and two evaporators (or one common), the distribution of cold is controlled by a mechanical damper (damper) or thermostat. If the damper is stuck in the closed position, cold air cannot physically enter the refrigerator compartment.
The thermostat (thermostat) is a device that turns the compressor on and off depending on the temperature. If it is “stuck” in the “off” position (or the electronic temperature sensor is lying), the compressor will not start and both chambers will heat up. But the opposite situation also happens: the thermostat “thinks” that it’s warm in the freezer and drives the compressor, but due to the design, the cold does not have time to reach the top.
In refrigerators with damper (often found in models Bosch, Siemens), the damper drive may burn out or jam. You can check this by getting to the air duct between the chambers. The damper should open and close as the temperature settings change. If it is closed tightly, the problem has been found.
☑️ Initial diagnostics with your own hands
Algorithm of actions and check tightness
If you find a problem, act consistently. Rule out simple reasons first: Is the door closed tightly? Is the air duct inlet clogged with food? Is there a hot pan next to the temperature sensor?
If simple methods do not help, proceed to checking the tightness. One of the popular, but risky methods (use only if you are confident in your abilities) is to check the soldering joints of the tubes (usually at the compressor) with a soap solution. Bubbles will indicate a leak. However, as mentioned above, most often it poisons in the foamed part, where a soap solution will not help.
For a complete repair, the technician performs the following actions:
- Inserting the processor (fitting) for connecting a pressure gauge.
- Checking the pressure in the circuit.
- Crimping with nitrogen to find a leak (listen for a leak, use a soap emulsion or leak detector).
- Replacing the filter-drier (mandatory for any depressurization).
- Evacuating the system (removing moisture and air).
- Refilling with the exact amount of freon using scales.
It is impossible to perform these operations independently without expensive equipment. Buying a vacuum pump and a cylinder with freon for a one-time repair will cost more than calling a specialist.
When a call to the technician is necessary
There is a clear line between maintenance and repair. Cleaning the drain hole, replacing a light bulb, or adjusting the legs is maintenance. Replacing a compressor, searching for leaks, soldering tubes is a complex repair.
Calling a technician is required if:
- 🛑 The compressor hums, but does not start (or immediately clicks and stalls).
- 🛑 You find an oily stain under the refrigerator (a sign of freon leakage along with oil).
- 🛑 After defrosting, the refrigerator started working, but a day later the situation repeated itself (guaranteed leakage or blockage).
- 🛑 A burning smell or a strong chemical smell appeared.
Remember that modern refrigerators are complex devices. An attempt to “treat” them by hitting the compressor or heating the tubes with a hairdryer at home in 90% of cases leads to the final failure of the equipment. Professional repair with a guarantee is the only safe solution.
FAQ: Frequently asked questions
Is it possible to temporarily use the refrigerator if the upper chamber does not freeze?
You can use it, but with caution. Perishable products (milk, meat) cannot be stored. You can keep drinks, sauces, and vegetables there that do not require strict temperature conditions. However, keep in mind that the compressor operates in emergency mode (without stopping), which can lead to its burnout at any time.
How much does a repair cost if you need refilling with freon?
The cost consists of the work of the technician, the cost of freon, filter-drier and travel. On average, this amounts to a significant amount, since the process is labor-intensive. The exact price can only be found out after diagnostics, since it may be necessary to replace the evaporator or capillary tube.
Why did the refrigerator start to freeze after defrosting, and then stopped again?
This is a classic sign of a freon leak or blockage. When defrosting, the ice at the site of a micro-leak or blockage melts, the permeability is restored, and the refrigerator operates. As soon as the moisture freezes again or the freon escapes through the hole, the problem returns. Defrosting is a temporary measure, not a solution.
Is it possible to replace the compressor yourself?
Theoretically, it is possible if you have the skills to solder copper pipes, a vacuum pump and pressure gauges. However, without experience, there is a high risk of soldering the pipes incorrectly, not removing moisture from the system (which will kill the compressor in a couple of months), or making a mistake with the dosage of freon. For a beginner, this task is almost impossible to perform efficiently.