The situation when The freezer compartment is still frozen, but the refrigerator compartment suddenly becomes warm, is a classic and most common problem with modern household appliances. Owners are often faced with bewilderment, because the compressor can hum as usual, creating the illusion of normal operation of the entire system. However, the absence of cold in the main chamber while the freezer is operating indicates a specific failure in the refrigerant circulation or temperature control system.
Ignoring this symptom can lead to food spoilage and more complex, expensive repairs in the future. No Frost System or static cooling require different approaches to diagnosis, but the root of the problem often lies in planes of mechanical damage or electronic failures. In this article, we will analyze in detail why this happens, how to independently carry out initial diagnostics, and in which cases you can’t do without calling a technician.
Before you panic or look for the phone number of a service center, you need to conduct a visual inspection and rule out trivial causes. Sometimes the problem is solved by simple defrosting, but in other cases it requires replacement of expensive components, such as the compressor or electronic control module.
Principle of operation and distribution of cold
To understand the cause of the malfunction, you need to understand the basic refrigerant circulation diagram. In most modern models, especially with the No Frostsystem, the cold is generated in the evaporator, which is physically located in the freezer area. A special fan drives cooled air through the air ducts into the refrigerator compartment.
If this air flow is blocked, the damper is stuck in the closed position, or the fan is faulty, the cold simply does not reach the main chamber. In models with a drip system (“crying” evaporator), the tubes can pass along the rear wall, and a violation of the tightness of the circuit leads to the fact that freon circulates only in a small circle.
Key element here is the balance of pressure and temperature. When the system is working properly, the refrigerant has time to release cold at all the necessary points. If the seal is broken or clogged, the pressure drops, and the freon simply does not reach distant sections of the circuit, remaining in the area of the compressor or freezer.
⚠️ Attention: If you hear gurgling or hissing inside the housing after the compressor stops, this may indicate gas movement in the system with a leak. Do not try to seal the tubes yourself without special equipment and skills.
Freon leakage as the main cause
The most likely reason for the situation when the freezer is freezing and the refrigerator is “warm” is a banal refrigerant leak. Freon is the working fluid of a refrigeration machine, and its quantity is strictly regulated by the manufacturer. Even a microscopic hole in the circuit, often invisible to the eye, leads to a gradual decrease in pressure.
Under such conditions, the compressor continues to work, trying to gain temperature, but there is no longer enough gas in the system for a full cycle. There is only enough refrigerant for the first section of the circuit (the freezer), and it simply does not reach the main compartment in the required state of aggregation. Leaks often occur at factory joints, locking connections, or due to corrosion of foamed circuit tubes.
It is difficult to diagnose a leak without a pressure gauge station, but there are indirect signs. If the compressor runs almost non-stop, and the condenser grille (at the back or on the sides) remains cold or lukewarm, this is a sure sign of a lack of freon. Normally, the grate should be uniformly hot.
The table below will help compare the symptoms with possible diagnoses:
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| The compressor is humming, but not turning off | Freon leak or capillary blockage | Checking pressure, looking for leaks |
| The refrigerator is silent, there is no light | Problem with the electrical network or thermostat | Check sockets, thermostat replacement |
| Ice only at the back wall | Faulty defrost or fan | Checking the defrost heating element and sensors |
| The sound of pouring water is heard | Critical refrigerant leak | Urgent call for a technician |
Malfunctions of the defrost system (No Frost)
In refrigerators with a system No Frost the evaporator defrost system is a critical component. Over time, a “coat” of ice builds up on the evaporator. In normal mode, this ice is periodically melted by heating elements, and the water flows into the drainage. If one of the elements of this chain fails, the ice blocks the air supply channels.
As a result, the fan either stops spinning due to freezing, or it circulates air, but it simply cannot pass through the ice plug into the refrigerator compartment. The main culprits here are: Defrost heating element, defrost sensor (defroster) or fuse. Also, the defrost timer or electronic module often breaks down, which simply “does not give the command” to defrost.
The user may notice that the refrigerator has started to work louder, or, conversely, the characteristic fan noise has disappeared. Sometimes the ice grows so much that it begins to deform the plastic parts of the case or even squeeze out the drawers.
How to check the defrosting heating element?
To check the heating element you need to “ring” with a multimeter in resistance measurement mode. If the device shows a break (one on the left), it means that the spiral is burnt out and requires replacement. Normal resistance is usually between 200 and 500 ohms.
It is important to note that the regularity of defrost cycles depends on the frequency of door openings and the humidity of the food. Frequently looking into the refrigerator accelerates freezing.
Problems with the fan and damper
If the compressor and defrosting system are working, but the cold is not flowing, it is worth checking the mechanical elements of the air supply. The fan located behind the rear panel of the freezer may fail electrically (the winding is burned out) or mechanically (the bushing is jammed).
An air damper is also installed in the channel between the chambers, which regulates the amount of cold supplied. It is controlled by a small motor. If the damper is stuck in the closed position, cold air cannot physically enter the refrigerator compartment. This often happens when there is severe icing or damage to the damper drive.
Checking the fan requires partial disassembly of the freezer. It is necessary to remove the rear panel and visually assess the condition of the blades and the absence of ice on the engine. Rotation should be free, without extraneous sounds.
Failure of electronics and sensors
Modern refrigerators are controlled by complex electronics. Temperature is controlled temperature sensors, installed at different points in the chambers. If the refrigerator compartment sensor “lies” and shows the module that it is already -10°C (although in fact +15°C), the module simply will not turn on the compressor or close the damper.
Often the problem lies in oxidation of the contacts or broken wires going to the sensors. In models with electronic control, error codes may light up on the display, which will indicate a specific faulty unit. However, not all models can display clear codes; sometimes a service menu is required for diagnostics.
The control module can also fail due to power surges in the network. In this case, the “brains” of the refrigerator may process signals incorrectly, starting the compressor at the wrong time or ignoring the readings of temperature sensors.
⚠️ Attention: Electronic modules are sensitive to humidity. If you notice condensation inside the chamber or on the wires, before replacing the electronics, be sure to eliminate the cause of the dampness, otherwise the new module will burn out just as quickly.
Diagnostics and action algorithm
If you encounter the problem described, do not immediately disassemble the unit. Start with simple steps to help narrow your search. Primary diagnosis will allow you to understand whether you can cope on your own or whether you need a specialist.
First, listen to the operation of the device. Is the compressor running? Is the fan humming? Are there any extraneous sounds? Then check for uniform cooling. Touch the walls and see if there is ice. These observations will be extremely useful when talking with the technician.
Below is a checklist of actions for the initial check:
- 🔌 Checking the power supply: make sure that the plug is firmly inserted into the socket, and there is voltage in the socket itself (check with a hairdryer or lamp).
- ❄️ Visual inspection: open the doors and estimate the amount of ice. If the freezer is covered in snow, there is a problem with defrosting.
- 👂 Acoustic test: listen to see if the fan inside the freezer is working (you need to open the door slightly and press the door sensor if it is mechanical).
- 🌡️ Temperature control: use a thermometer to accurately know the temperature in the chambers, and do not rely on sensations.
☑️ Diagnostics before calling a specialist
When necessary call a technician
There are a number of situations when independent repairs are not only useless, but also dangerous. If a freon leak is diagnosed, specialized equipment is required: a vacuum pump, charging scales, pressure gauges and, of course, the refrigerant itself. You cannot simply “add gas” - you need to find and eliminate the leak, replace the filter-drier and fill the system strictly by weight.
Replacing a compressor is a complex operation that requires soldering copper tubes with an open flame near plastic parts and polyurethane foam. Inept actions can lead to fire or permanent failure of the equipment. Also, replacement requires professional pumping of the system.
If the problem is in the foamed circuit (tubes inside the walls of the housing), repairs may not be economically feasible. The technician may suggest installing an external evaporator (“weeping cap”), which will change the appearance and operating principle of the refrigerator, but will extend its life.
Why did the refrigerator work after defrosting, but after a week it stopped again?
This is a classic symptom of a malfunction of the defrost system (No Frost). Defrosting temporarily removes the ice blockage and air begins to circulate again. However, since the heating element, sensor or timer does not work, the ice builds up again within a few days or weeks, blocking the channels again. The faulty element of the defrost system needs to be replaced.
Is it possible to operate the refrigerator if one chamber does not work?
Short-term operation is possible, but undesirable. The compressor will work non-stop, trying to reach temperature, which will lead to overheating and rapid failure. In addition, food in a warm chamber will spoil. It is better to turn off the device before repair.
How long does it take to repair a freon leak?
Finding a leak can take from 1 to 3 hours, sometimes longer if it is hidden. The vacuuming and filling process itself takes about an hour. If re-hanging the evaporator or complex work with the housing is required, the repair may take 1-2 days.
Is it true that there is no point in repairing old Don or Biryusa refrigerators?
This is a myth. Simple Soviet refrigerators are often more repairable than modern “sophisticated” models. They have a simple design, readily available spare parts and no complex electronics. Replacing the thermostat or start relay in them is inexpensive and can be done quickly.