The situation when the refrigerator compartment is warm, food begins to spoil, and the freezer continues to operate normally is a classic scenario for the breakdown of modern two-chamber units. Owners often panic, believing that the equipment has completely failed, but the presence of cold in one of the compartments indicates that the system is still functioning, but with disturbances in the distribution or generation of cold. Understanding the physical processes occurring inside refrigeration circuitallows you to quickly diagnose the problem and avoid unnecessary expenses on calling a technician for simple operations.
The main reason lies in the design: most models use one compressorthat drives the refrigerant through circle, first through the freezer and then through the refrigerator. If the freezer is working, it means that the compressor is alive and freon is present in the system, but the circulation is disrupted either at the level of the control electronics, or due to a blockage, or due to a partial leak. It is important not to ignore the first symptoms, such as ice freezing on the back wall or too loud operation of the motor, since a timely reaction can save products and the budget.
Before proceeding with a detailed analysis of faults, it is necessary to carry out an initial visual diagnostics. Often the problem is solved by checking the tightness of the doors or defrosting the unit, which does not require special tools. However, if simple methods do not help, you will have to delve into the study of technical components, such as evaporator, capillary tube or temperature sensors.
⚠️ Attention: If you hear gurgling or hissing inside the walls after stopping compressor, this may indicate movement of freon residues during a leak. Do not try to solder tubes yourself without a vacuum pump and skills in working with gas.
Problems with the No Frost system and ice on the evaporator
In refrigerators equipped with the system No Frost, the most common reason for the lack of cold in the upper chamber when the freezer is running is a malfunction in the defrost system evaporator. Cold air is forced by a fan from the freezer compartment into the refrigerator compartment through special air ducts. If evaporator the freezer becomes overgrown with a thick layer of ice (a fur coat), the air flow is blocked, and the cold simply does not reach the upper compartment. Visually this may not be noticeable, since the evaporator is hidden behind a plastic panel.
The freezing process occurs due to the fact that moisture from the products condenses on the cold tubes and freezes. In normal mode Defrost heating element periodically it turns on and melts this ice, and the water flows into the drain pan. If one of the elements of this chain fails, the ice builds up to such an extent that it blocks the air supply channels. As a result, there is ice in the freezer (and even more than needed), and in the refrigerator compartment the temperature rises to room temperature.
- ❄️ The defrosting heating element is faulty - the heating element has burned out and does not melt the ice.
- 🌡️ The defrost sensor has burned out - the system “does not know” that it is time to turn on the heating.
- 🚿 The drainage hole is clogged - the water does not drain and freezes at the bottom of the channel.
- 💨 The fan has broken - air does not circulate between the chambers.
Diagnostics often require complete defrosting of the refrigerator within 24 hours. If after turning on the unit the cold appeared, but after a few days the situation repeated itself, it means that one of the elements of the defrosting system requires replacement. This is a typical problem for models Indesit, Atlant and Beko, where sensors can fail quite often.
☑️ Diagnostics of the No Frost system
Compressor malfunctions and loss of performance
Although the freezer is working, this does not always mean that compressor is 100% operational. Dual-loop systems, or systems with one loop but split flow, may exhibit different cooling efficiencies. If the compressor has lost part of its power (valve wear), it may only be enough to maintain a low temperature in a small volume of the freezer, but the power is no longer enough to cool a large space in the refrigerator compartment.
Another scenario is the compressor running idle or intermittently. The engine may hum and start, but not create the necessary pressure in the system. In such cases, the compressor housing is often heated to very high temperatures or, conversely, it operates in a cold state when the power is turned on. Start relay may also be the reason: it clicks, trying to start the motor, but turns it off due to overcurrent.
It is important to listen to the nature of the unit's operation. If the compressor runs continuously without turning off, and the temperature in the refrigerator compartment does not drop below +10...+15°C, this is a sure sign of loss of performance or refrigerant leakage. In normal mode operation cycle should be interrupted by stops, during which the temperature inside is maintained due to thermal insulation.
⚠️ Attention: Do not touch the compressor immediately after operation if it is hot. Let it cool before diagnostics to avoid burns and distortion of readings when checking the windings.
Diagnostics of a compressor requires measuring instruments. It is necessary to check the resistance of the windings and make sure that there is no short circuit to the housing. If everything is in order with the electrical part, but there is no pressure in the system, there may be an internal break in the valves or a mechanical jamming of the piston group.
How to check a compressor without a pressure gauge?
Disconnect the condenser and start the compressor directly. If air is blown out of the outlet tube with force (felt with the palm of your hand at a distance of 10-15 cm), it means that the compressor is pumping. If the flow is barely felt, the compressor requires replacement or overhaul.
Refrigerant leak and capillary tube blockage
These two problems often go together or have similar symptoms. Freon is the working fluid of the refrigerator, and its quantity is strictly regulated. When there is a leak (even microscopic after years of vibration), there is less gas. At first, the cold begins to be lacking in the refrigeration chamber, since it is located further from the evaporation point or receives a secondary flow. The freezer, being at the beginning of the circuit, still holds minus, but with less efficiency.
Clogged capillary tube is a mechanical obstacle to the movement of freon. Oil circulates in the system, which can become coked over time, or moisture enters the circuit, which freezes in a narrow place in the tube, forming an ice plug. The symptoms are similar to a leak: the compressor runs for a long time, the condenser (grid at the back) is only partially warm or cold, and the chambers do not have the required temperature.
It is difficult to distinguish a leak from a blockage at home, but you can try to observe the behavior of the unit after complete defrosting. If, after turning on, the refrigerator worked for a couple of hours, and then stopped cooling and went silent (or vice versa, it hums nonstop), and the side walls do not heat up, most likely the problem is in the circulation of the refrigerant.
Repair in both cases is complex and requires the intervention of a specialist with specialized equipment: a vacuum pump, a freon dispenser and a burner. It is almost impossible to independently remove a blockage or solder a leak in the foamed part of the case without the risk of damaging the thermal insulation or pinching other tubes.
Failures in the operation of the thermostat and electronic sensors
Temperature control in older models is carried out mechanical thermostat, and in new ones - electronic sensors (thermistors). If the thermostat is “stuck” in the “Off” position or its capillary tube has lost sensitivity, the compressor simply will not turn on when commanded, or, conversely, will work without stopping, without bringing the temperature in one of the chambers to normal.
In electronically controlled systems (for example, LG, Samsung) is responsible for the temperature control module, which reads readings from several sensors. If one of the sensors (for example, the air sensor in the refrigerator compartment) is lying and shows that it is already -5°C, the module will not give a command to cool, although in fact it is +15°C. A sensor error is often displayed on the display in the form of a code.
Checking a mechanical thermostat is simple: you need to close the contacts of the incoming and outgoing terminals (after turning off the power!). If after closing the compressor starts and gets cold, it means the thermostat is faulty and needs to be replaced. For electronic systems, you will need to test the thermistor with a multimeter and check its resistance with the table for a specific model at a certain temperature.
Table of symptoms and probable causes
For ease of diagnosis, the main The symptoms and the probable malfunctions corresponding to them are summarized in a table. This will help narrow down the search for the problem before calling a specialist or purchasing spare parts.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| It’s warm in the refrigerator compartment, ice in the freezer | Clogged defrost system, burnt heating element | Medium |
| The compressor hums, but does not start | The starting relay or compressor wedge is faulty | Medium/High |
| There is cold, but weak, the compressor does not turn off | Freon leakage or loss of performance | High |
| Temperature fluctuates, code on display errors | Faulty sensor or control module | Low/Medium |
| Water on the floor, warm in the chamber | Clogged drainage or broken drip system heater | Low |
It is worth considering that symptoms can be combined. For example, if you work for a long time with a freon leak, the compressor may burn out due to overheating, which will add to the problem of leakage and the replacement of the motor. Therefore, you should not delay repairs at the first signs of ineffective operation.
The influence of seals and correct installation
Sometimes the cause of heat in the refrigerator compartment is trivial and is not related to the breakdown of components. Rubber seal the doors dry out over time, crack or simply become dirty leftover food. Warm, moist air constantly enters the chamber through a loosely fitting door. The compressor tries to compensate for the heat by working without stopping, but due to the constant flow of heat it cannot cope with the task, especially in the hot season.
The correct one is also important. installation of the refrigerator. If the unit is placed too close to a wall, radiator, or in a niche without clearances for ventilation, heat transfer is disrupted. The condenser does not have time to cool down, efficiency drops, and the refrigerator compartment suffers first. The minimum gap at the back and sides should be 5-10 cm.
Checking the seal is carried out with a simple test with a sheet of paper. Clamp the sheet with the door around the perimeter. If it is pulled out without effort or falls out on its own, the seal does not hold. You can try to restore it (warm it with a hairdryer, lubricate it with silicone), but most often it needs replacement.
⚠️ Attention: When installing the refrigerator, make sure that it is strictly level. Misalignment can lead to the doors not fitting tightly by gravity, even if the seal is working properly. Use a building level to check.
Frequently asked questions (FAQ)
Is it possible to continue to use the refrigerator if it is warm in the compartment and cold in the freezer?
In the short term - yes, food from the freezer will not spoil. However, storing food in the refrigerator will become impossible. Long-term operation in this mode is harmful to the compressor, which will wear out trying to reach the set temperature. It is better to eliminate the malfunction.
Why did the refrigerator work after defrosting, but a week later it stopped again?
This is a classic sign of a malfunction of the defrost system (No Frost). Defrosting temporarily removes the ice plug, but since the cause (burnt heating element, sensor or timer) is not eliminated, the ice builds up again in a few days, blocking air circulation.
How much does the repair cost if you need to refill freon?
The cost consists of the work of the technician, the cost of the refrigerant and consumables. Refilling with freon usually requires searching for leaks and soldering, so you can’t just “add gas” - this is a temporary measure. A complete repair to eliminate the leak can cost from 30% to 60% of the price of a new refrigerator.
Does the compressor hum when there is a freon leak?
Yes, often the compressor hums constantly, since the temperature sensor does not give a command to shut down (the temperature has not been reached). However, in some cases, with a severe leak or blockage, the outlet pressure may be so low that the protection relay will constantly click, trying to start the motor.