The situation when the food in the freezer is petrified, and the milk in the refrigerator compartment has turned sour, causes bewilderment and anxiety. Many owners of household appliances are faced with a paradoxical phenomenon: The freezer is freezing, and the refrigerator completely refuses to cool the air. This is a classic symptom of a refrigerant circulation problem or a malfunction in the control system.
You should not panic and immediately call a technician, as in some cases the problem can be solved by simple actions. However, this signal cannot be ignored, because one that is working for wear compressor can burn out due to overheating. In this article, we will analyze in detail the mechanics of the process, explain why heat goes into the freezer, and give a step-by-step algorithm of actions.
Understanding the principles of operation two-chamber refrigerators will help you quickly diagnose a malfunction. We will consider both simple operating errors and complex technical breakdowns that require the intervention of professionals.
The principle of operation of two-chamber cooling systems
To understand why the heat does not reach the fridge compartment, you need to understand the structure of the unit. Most modern models use single-circuit system cooling. This means that the cold is generated in one place - the evaporator, located, as a rule, in the freezer.
The fan drives ice-cold air through the air ducts into the refrigeration compartment. If this flow is blocked or disrupted, the cold remains below, and the upper part does not receive the necessary temperature. In older models without a system No Frost the cold is transmitted through a common wall or a separate circuit, but the principle remains similar.
The key element here is a thermostat or electronic sensor that reads the temperature in the main chamber. It is its readings that cause the compressor to turn on or off. If the sensor is “lying,” the system will not work correctly.
⚠️ Attention: In single-circuit systems, the malfunction often lies in the clogging of the air channels with ice, even if it is not noticeable externally.
The most common reasons for the lack of cold in the chamber
The list of potential culprits is quite wide, but 80% of cases occur due to several specific problems. The first step is to exclude banal overload of products or incorrect installation. If the equipment is installed according to the rules, it is worth checking the following components.
Often the problem lies in a freon leak. When the amount of refrigerant decreases, there is not enough of it for the entire volume of the evaporator. As a result, only the initial section of the circuit freezes (usually in the freezer), and the gas simply does not reach the refrigeration chamber in the required state.
Another common option is a compressor breakdown. If it works but does not create enough pressure, circulation is disrupted. It is also possible that there is a failure of control module, which incorrectly distributes operating cycles.
- ❄️ Capillary tube clogged - refrigerant does not circulate through the system.
- 🔧 Compressor malfunction - insufficient pressure in the circuit.
- 🌡️ Failure of temperature sensors - incorrect readings for the controller.
- 💨 Fan malfunction - air is not pumped into the chamber.
It is important to note that in models with the system No Frost the list is expanded due to defrosting elements. If the heating element or defrost timer fails, the evaporator becomes overgrown with ice, blocking the air supply channels.
Problems with the thermostat and temperature sensors
The thermostat (or temperature sensor in electronic models) is the “eyes” of the refrigerator. If it stops seeing the real temperature, the compressor may not turn on on time or, conversely, work without stopping, but ineffectively.
In mechanical models, the thermostat is a tube filled with gas that expands or contracts. Over time, the gas may evaporate and the contacts will simply stop closing. In this case, refrigerator it will think that it is already cold in the chamber and will not start the cooling cycle.
Modern electronically controlled devices use thermistors. Their resistance changes depending on temperature. If the thermistor gives an error, a fault code may light up on the display, but sometimes the equipment just silently stops cooling.
Error codes (approximate):F1 - Refrigerator compartment sensor malfunction
F2 - Freezer compartment sensor malfunction
F3 - Problem with the defrost sensor
Replacing the sensor is a simple procedure, but requires precision. The new element must have exactly the same characteristics as the old one, otherwise the operating modes will be disrupted.
Faults of the compressor and start relay
The compressor is the heart of the refrigeration unit. If it hums but does not start, or starts for a couple of seconds and clicks, the problem is most likely in the start relay or motor windings.
The start relay is responsible for sending a starting pulse to the compressor winding. This is a consumable item that is often the first to fail. Replacing it is inexpensive and often solves the problem when freezer it is still freezing by inertia, but the chamber is already warm.
A more serious situation is an interturn short circuit in the compressor windings. In this case, the engine hums and heats up, but cannot create the necessary pressure. There is refrigerant in the system, but it is not circulating. This can only be corrected by replacing the compressor.
| Symptom | Probable cause | Solution |
|---|---|---|
| Buzzes, but does not start | Start relay | Replacing the relay |
| Works constantly, does not cool | Freon leak | Looking for leaks, refilling |
| Hot on one side, cold on the other | System clogged | Purge, filter replacement |
| Gets very hot and shuts down | Compressor malfunction | Replacing the compressor |
Diagnostics of a compressor requires skills in working with a multimeter. It is necessary to “ring” the windings for resistance and check if there is a breakdown on the housing.
Freon leakage and system clogging
Freon is the working fluid of the refrigerator. If its amount in the system decreases due to microcracks in the tubes or corrosion, efficiency decreases. First, the far part of the circuit (refrigeration chamber) stops cooling, and then the entire system.
Clogged capillary tube is another scourge of refrigeration equipment. An ice plug (due to moisture) or clogging with oil oxidation products may form in the system. In this case, refrigerant physically cannot pass beyond the freezer.
Signs of a leak or blockage are often accompanied by unusual behavior of the condenser (grid at the back). It may be only half hot or remain cold when the compressor is running.
⚠️ Attention: Self-refilling with freon is prohibited and dangerous. Evacuation of the system and special equipment are required.
To fix these problems, the technician will need to find the leak (often a foamed part of the case or soldered connections), fix it and refill the system. This is a complex repairrequiring qualifications.
How does the master look for a leak?
The master uses a leak detector or paints the system with special oil under pressure. Sometimes you have to open the foamed part of the case if a leak occurs in the evaporator.
No Frost system and problems with defrosting
In refrigerators with the system No Frost moisture does not settle on the products, but is frozen on a hidden evaporator. Periodically, this ice must thaw. The defrost system is responsible for this process: timer, heating element and defrost sensor.
If any of these elements breaks, the evaporator becomes overgrown with a “fur coat”. The fan stops pushing air through the ice shell, and the cold stops flowing into the refrigerator compartment. In this case, the freezer can continue to freeze, since the evaporator is often located there.
Symptoms of such a breakdown:
1. Ice or frost is visible on the back wall of the freezer.
2. The fan is humming, but no air is blowing.
3. After complete defrosting (for 24 hours), the refrigerator begins to work normally, but after a week the problem returns.
- 🔥 The defrost heating element has burned out - the ice does not melt.
- ⏱️ The timer is faulty - it does not give a command to defrost.
- 🌡️ Sensor defrost is “stuck” - the system thinks that there is no ice.
The solution to the problem is to replace the faulty element of the defrost system. Often they change the entire chain at once to prevent the situation from reoccurring in the near future.
Diagnostics and procedure in case of breakdown
What to do if you find a problem? Do not rush to disassemble the unit. Start with simple steps that will help you narrow down your search or completely solve the problem without calling a technician.
First, check to see if the products are blocking the ventilation holes. Make sure the door closes tightly and the seal is clean. If visually everything is in order, proceed to deeper diagnostics.
☑️ Primary diagnostics
Try to completely defrost the refrigerator. Unplug it for 24 hours with the doors open. This will allow ice blockages in the channels and evaporator to melt. If after turning on the cold appears, but after a couple of days it disappears again, the problem is in the defrosting system.
If defrosting does not help, listen to the compressor. Is it working normally? Does the condenser grille at the back get hot? These observations will be very useful to the technician during diagnostics.
When it is necessary to call a technician
There are a number of situations when self-repair is not only useless, but also dangerous. If you do not have the skills to work with electrical appliances and refrigerants, it is better not to risk it.
Calling a specialist is required if:
1. You hear hissing or gurgling (a sign of a freon leak).
2. The compressor hums, but does not start, or gets very hot.
3. After defrosting, the problem returns after a short time.
4. You see traces of oil on the floor under the refrigerator.
Professional repairs include not only replacing parts, but also checking the tightness of the system, evacuation and accurate refrigerant charging. This guarantees long and stable operation of the equipment in the future.
Why is there ice in the freezer, but warm in the refrigerator?
This is a classic sign of circulation problems. Ice in the freezer indicates that the refrigerant is reaching it and cooling the evaporator. But further, into the fridge compartment, cold air does not flow due to clogging of the channels with ice, a broken fan, or a lack of freon.
How long can a refrigerator operate with such a malfunction?
You cannot operate the equipment in this mode for a long time. The compressor works without interruption, trying to reach the set temperature, which leads to its overheating and eventual combustion. The lifespan in this mode is from several days to a couple of weeks.
Can a refrigerator be used if the freezer is working?
Can be used, but with restrictions. Food in the refrigerator will spoil quickly. In addition, you risk completely destroying the compressor. It is better to temporarily move the food to a cool place or to the balcony (in winter) and start making repairs.