The situation when it is warm in the refrigerator compartment, but the freezer continues to freeze, is one of the most common and deceptive. At first glance, it seems that if the compressor is humming and the ice freezes, then the equipment is working properly, but this is only a half-truth. Such a temperature asymmetry indicates a violation of the refrigerant circulation or a failure in the control system that requires immediate intervention.
Ignoring the problem will lead to spoilage of products, the growth of bacteria and, ultimately, to expensive repairs of the main unit. Primary diagnostics will help you understand whether you can handle it yourself or whether calling a technician is inevitable. Often the reason lies in trivial things, but sometimes expensive components need to be replaced.
In this article we will analyze an algorithm of actions that will help localize the fault. You will learn how to distinguish clogged capillary from a freon leak and why compressor can work in vain. The correct sequence of steps will save your time and money.
Primary diagnosis: checking the simplest causes
Before disassembling the equipment or calling a specialist, it is necessary to exclude external factors. Users often forget about basic operating rules, which leads to a false sense of failure. Check that the ventilation grille is not blocked by food, since in modern systems No Frost cold air is forced in.
Make sure that the refrigerator compartment door fits tightly. If the seal worn out or dirt has accumulated on its surface, the seal is broken. Warm air from the room constantly flows inside, and the cooling system simply does not have time to compensate for heat loss, although the freezer, being more insulated, can cope for now.
⚠️ Attention: If you notice that the rubber seal has lost its elasticity or is torn, replacing it is the first thing to do. Attempts to heat it with a hairdryer give only a temporary effect.
It is also worth checking the temperature settings. Perhaps one of the household members accidentally changed the settings by setting the minimum cooling power. In models with electronic control, the failure could have occurred due to a power surge.
Inspect the back wall of the refrigerator compartment. If it is covered with a layer of ice or, conversely, absolutely dry and warm when the compressor is running, these are different symptoms. Icing often indicates problems with defrosting, and a dry wall indicates a lack of freon.
No Frost system: problems with defrosting and fan
In refrigerators with a No Frost system, air circulation is provided by a fan. If you hear the hum of the motor, but the cold does not enter the upper compartment, the fan may be jammed with ice or it has failed. An ice plug in the air supply channel blocks the flow, and the cold remains only in the freezer.
A frequent cause is a malfunction of Defrost heating element or the timer. The system stops defrosting the evaporator, it becomes overgrown with a “fur coat”, and the air channel is blocked. In this case, the refrigerator works for wear and tear, trying to cool a volume that it physically cannot reach.
☑️ Diagnostics of the No Frost system
To check, you need to defrost the unit completely, keeping it turned off for at least 12 hours. If after switching on the problem disappeared for a week and then recurred, the problem is definitely in the defrost system. Replacement is required defrost timer or the thermostat.
In some models damper the cold air supply may get stuck in the closed position. This is a mechanical part that regulates the air flow between the chambers. Its jamming is often accompanied by a characteristic click or crack when trying to open.
How to check the fan without disassembling?
Put your ear to the back wall of the refrigerator. If you hear the compressor hum, but there is no air noise or blade rotation, the fan is not working. Sometimes it helps to lightly tap on the housing in the area of the fan to move it from its place if it is frozen. a microcrack appears, the gas evaporates, and the compressor continues to hum, trying to pump through something that is no longer there, creating the appearance of work.
Refrigerant leak: how to detect and what to do
One of the most serious reasons why the refrigerator stopped freezing is freon leak. The refrigerant circulates in a closed circuit, and if a microcrack appears in the system, the gas escapes. At the same time, the compressor continues to hum, trying to pump something that is no longer there, creating the appearance of work.
The symptoms of a leak are specific: the freezer is still freezing (since the evaporator is located there), and the heat in the refrigerator compartment will stop freezing over time. lower chamber. To the touch, the condenser (grid at the back) will be cold or slightly warm, although it should be hot.
| Symptom | Probable cause | Action |
|---|---|---|
| The compressor is hot, the condenser is cold | Complete freon leak | Call a technician to find a leak |
| A gurgling or hissing sound is heard | Micro leak in the circuit | Urgent diagnostics, turn off the device |
| The engine runs non-stop | Lack of refrigerant | Checking the pressure in the system |
| Oil spots have appeared under the refrigerator | Rupture of the oil tube | Do not turn on, soldering is required |
It is impossible to eliminate the leak on your own, since special equipment for evacuation and refilling is required. Attempts to simply add freon without eliminating the cause will lead to a repeated leak in a short time and combustion of the compressor.
⚠️ Attention: Freon is odorless and colorless, but it is heavier than air. If you smell chemicals or see oil stains, immediately ventilate the room and unplug the equipment.
Clogged capillary tube: symptoms and solution
The capillary tube is a thin channel in which it occurs. throttling of the refrigerant. If there is moisture or oil breakdown products in the system, ice blockage or a blockage may form. Freon cannot circulate in full, due to which the pressure drops and the cooling capacity decreases sharply.
If blocked, the compressor operates with difficulty. overload, trying to push the gas through the obstacle. This is often accompanied by overheating of the motor housing. A characteristic sign is that the freezer is working, but weaker than usual, and the temperature in the refrigerator compartment is higher than normal.
To eliminate the blockage, technicians use the method of pressing with nitrogen or replacing the filter element. At home, you can try to defrost the unit within a day so that the ice plug melts. a temporary measure.
Often the blockage is accompanied by a change in the sound of the engine. It becomes more strained, the humming intensifies. If you ignore the problem, the compressor it may burn out from overheating, and repairs will cost many times more.
Malfunctions of the thermostat and sensors
In modern models, electronic sensors are responsible for the temperature regime. If the sensor in the refrigerator compartment fails and shows incorrect data (for example, that it is already cold), the compressor will turn off ahead of time. As a result, the freezer (where the sensor is) will freeze, and the top one will freeze. camera - no. thermostats. If the sensor in the refrigerator compartment fails and shows incorrect data (for example, that it is already cold there), the compressor will turn off prematurely. As a result, the freezer (which has its own sensor) will freeze, but the upper chamber will not.
In mechanical refrigerators, the thermostat is a device with a capillary that reacts to temperature. If its settings are lost or the contacts are oxidized, the circuit opens prematurely. You can check this by temporarily closing the contacts (only for experienced users!).
In electronically controlled refrigerators (for example, LG, Samsung, Bosch), a sensor malfunction is often indicated by an error code on the display. By deciphering the code, you can determine exactly which element requires replacement.
⚠️ Attention: When replacing sensors, be sure to unplug the refrigerator. A short circuit in the control circuit can damage the main control module, the cost of which is up to 50% of the price of a new refrigerator.
It is also worth checking the integrity of the wires going to the sensors. Rodents or mechanical damage during harvesting could disrupt the contact. Visual inspection of the wiring harnesses at the bottom of the unit can often help locate an open.
Problems with the compressor: when replacement is needed
The compressor is the heart of the refrigerator. If it works but does not create the required pressure, it means that the internal valves have broken down or the piston group has worn out. In this case, the freon circulates, but is not compressed to the required values, and there is no cooling effect.
Signs of a compressor malfunction: the engine gets very hot, hums intermittently, or starts and immediately turns off (the thermal relay is activated). If you hear clicks of the start relay, but the motor does not start, the starting winding may be burned out or the rotor is jammed.
In two-compressor models, the situation is simpler: if one compressor (for the refrigerator) fails, the second (for the freezer) continues to work normally. In this case, the repair consists of replacing the faulty motor.
It is worth considering that replacing the compressor is often not economically feasible for older models. The cost of work and a new unit can be a significant part of the price of a new refrigerator.
Frequently asked questions (FAQ)
Is it possible to temporarily use a refrigerator if it does not freeze in the upper chamber?
It cannot be used to store perishable products (milk, meat) as they will multiply there. bacteria. However, you can use it as a cabinet for storing vegetables, canned goods or drinks that do not require low temperatures. The main thing is to make sure that an ice coat does not form in the freezer, which can lead to breakdown.
How long does it take to defrost the refrigerator to check?
For complete defrosting and thawing of the ice in the hidden channels of the No Frost system, it takes at least 12 hours, or better yet, a full day. Only after this can conclusions be drawn about the operation of the system. Turning on earlier than this period may not produce results, since the ice plug has not yet had time to melt.
Why is the back wall of the refrigerator covered with ice?
This may be a sign of a loose door fit, a malfunction of the defrost sensor or heating element. Ice also often appears on the back wall if you put a hot pan in the refrigerator or left the door open for a long time. In the No Frost system, this indicates that the defrost cycle is not proceeding correctly.
How often do you need to change the rubber seals?
The service life of the seals is on average 5-7 years, but depends on operating conditions. If the rubber becomes hard, sticky or begins to crumble, it needs to be changed immediately. You can check the tightness of the fit using a sheet of paper: hold it with the door and try to pull it out. If the sheet comes out easily, the seal does not hold.