The situation when the food in the freezer is petrified, but the main compartment is warm, is familiar to many owners of household appliances. This is a classic symptom of poor refrigerant circulation or a malfunction in the temperature control system. Unlike a complete equipment failure, here the compressor often continues to hum, creating a false impression of normal operation of the unit.
It is important to understand that modern and old models of refrigerators are designed differently. In some systems, the evaporator is located only in the freezer, and the cold is pumped into the upper chamber by a fan. In others, freon passes along the circuit first through the freezer, and then through the main compartment. Violation of this balance always indicates a specific malfunction that can be diagnosed without calling a technician immediately.
Before panicking or looking for a service center phone number, it is worth carrying out initial visual and auditory diagnostics. Often the reason lies in trivial things, such as a frozen coat of ice or an incorrectly installed door. However, ignoring the problem can lead to damage to a large number of products and higher repair costs in the future.
Primary diagnostics: what to check first
First of all, it is necessary to exclude external factors that do not require disassembling the unit. Check that the rubber seal on the main compartment door is tight. If warm air from the room enters the chamber, the system may not cope with cooling, even if the compressor is working hard. Deformation of the seal is a common cause of local temperature increases.
Pay attention to the noise level of the operating compressor. If the engine hums continuously without turning off to rest, this is a sure sign that it is trying to compensate for the lack of cold. During normal operation, the unit should cycle on and off. Constant running of the engine often indicates a refrigerant leak or a serious blockage of the system.
⚠️ Attention: If you notice that the back wall of the freezer is covered with an uneven layer of frost or ice (for example, only on one side or shreds), this is almost guaranteed to indicate a freon leak or a clogged capillary tube.
It is also worth checking the settings of the thermostat or electronic control unit. A random power failure could reset the settings to minimum cooling. Make sure that the ventilation openings in the main compartment are not blocked by food. Air circulation is critical for even distribution of cold throughout the entire volume of the chamber.
Problems of the No Frost and defrosting system
In refrigerators with a system No Frost the main cold is generated in the freezer compartment, and then the fan accelerates it through the channels into the main compartment. If the freezer is freezing but the refrigerator is warm, the problem often lies in the evaporator defrost system. The defrost heating element, temperature sensor or timer could have failed, causing the evaporator to be covered with ice.
When ice completely blocks the air ducts, cold air physically cannot enter the upper chamber. The compressor runs constantly, trying to cool the sensors, but to no avail. In such cases, you can often hear the fan humming or crackling as it tries to break through the ice plug. Defrosting the unit for a period of 24 to 48 hours often helps to temporarily solve the problem if the defrosting system has not completely burned out.
- ❄️ Malfunction of the defrost heating element: the heating element burns out and does not melt ice on the evaporator.
- 🌡️ Failure of the defrost sensor: the thermostat does not give a command to turn on the heating, although the ice is already frozen.
- 🌀 Drain hole clogged: water from melting ice does not leave, freezes and blocks air channels.
To check the heating element and sensors, a multimeter and partial disassembly of the rear panel of the freezer are required. If you do not have the skills to work with electrical circuits, it is better not to take risks. Incorrect assembly can lead to damage to plastic air ducts, which are very fragile in the cold.
Freon leak: symptoms and consequences
One of the most common reasons why the main compartment has stopped cooling is a banal refrigerant leak. Freon circulates in a closed circuit: first it passes through the evaporator of the freezer, giving off part of the cold there, and then enters the circuit of the main compartment. If there is little gas in the system, there is only enough of it for the first stage - freezing.
The refrigerant simply does not have time to reach the main refrigeration compartment, since it completely evaporates at the beginning of the cycle. A telltale sign of a leak is a hot or lukewarm condenser grille on the back wall (on older models) or on the sides (on newer models). Normally, they should be uniformly warm.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The compressor runs without stopping | Freon leak or blockage | High (requires a technician) |
| Bloating of the refrigerator wall | Corrosion of the sealed pipeline | High (circuit replacement) |
| The refrigerator rarely turns on | Thermostat malfunction | Medium (part replacement) |
| A gurgling sound is heard | Remaining freon in the system | Requires refueling |
It is almost impossible to independently find the location of the leak without special equipment, such as a leak detector. Often microcracks form in the foamed parts of the case or in soldering areas. Refilling the refrigerator This is not just “adding gas”, it is evacuation of the system, replacing the filter-drier and accurate dosing of the refrigerant on the scale.
⚠️ Attention: An attempt to independently buy a cylinder with freon and fill the refrigerator through the service valve (if there is one) without evacuation of the system will lead to the formation of an ice plug in the capillary and the final failure of the compressor.
Clogged capillary tube
The capillary tube is a very thin copper pipeline that creates the necessary resistance for the movement of freon. During operation, a blockage may form inside it. This could be a product of compressor wear, oxidation of metals, or, in rare cases, frozen moisture that entered the system during a previous poor-quality repair.
Signs of a blockage are similar to a leak: the compressor works constantly, trying to push freon through the plug, the freezer freezes (sometimes even too much), and the main chamber is warm. In this case, the condenser (grid at the back) may remain cold, since gas circulation is disrupted. A characteristic click when trying to start or silence after the engine is running may indicate that thermal relay the overheating engine is turning off.
Cleaning the capillary is a complex technical procedure. It requires:
1. Opening the circuit.
2. Warming up the blockage (sometimes it helps if it is a paraffin plug).
3. High pressure nitrogen purging.
4. Replacing the filter-drier, which takes the brunt of contamination.
Why can’t you just clean the tube?
Simple blowing often does not help, since microscopic particles of copper or oxides settle in the bends. Without replacing the filter drier and evacuating the system, a new blockage will form within a few weeks or months.
Faults of the compressor and start relay
The compressor is the heart of the refrigerator. If it does not work correctly, the entire thermodynamics of the process is disrupted. In two-compressor models (where there are separate motors for the freezer and refrigerator), the situation is simpler: the upper compartment compressor has burned out, which means that it is necessary to change it.
In single-compressor models, if the motor hums but does not start, or starts for a few seconds and clicks, the problem may be start relay. This is an inexpensive part that is easy to replace yourself. However, if the compressor hums smoothly, but does not create the required pressure in the system, it may have worn out piston rings or valves.
- 🔨 Knock in the compressor: a sign of mechanical wear of internal parts, the unit needs to be replaced.
- 🔥 Overheating of the motor housing: may indicate an interturn short circuit of the winding.
- ⚡ Knocking out plugs: short circuit in the compressor electrical circuit.
Diagnostics of a compressor requires measuring the winding resistance and checking the insulation resistance. If you do not know how to use an ohmmeter, it is better to entrust this task to a professional. You can try to start a faulty motor using a special tablet (starting device), but this is only a temporary measure before buying a new one.
☑️ Diagnostics before calling a technician
Electronic control module failure
In modern refrigerators with electronic control (where the temperature is set in degrees on the display), the control module is responsible for the distribution of cold. It receives signals from temperature sensors and decides when to turn on the compressor, fan or defrost heating element.
If the electronic unit is “buggy”, it may not send a command to open the damper that blocks the channel between the freezer and the refrigerator, or may not turn on the blower fan. Visually it looks like this: the freezer is operating normally, and there is heat at the top. Often such failures occur after power surges in the network.
To diagnose the module, it is necessary to test the sensors and check the output signals to the actuators. Sometimes a complete reset (Hard Reset) helps, which is performed according to the instructions for a specific model Indesit, Bosch or LG. If resetting does not help, one of the chips on the board is probably burned out and needs to be resoldered or replaced.
⚠️ Attention: Electronic modules are sensitive to moisture. If you carried out defrosting and water got inside the control panel, oxidation of the contacts may not occur immediately, but after several weeks of operation.
When you need to call a technician
Independent repair is possible in cases of replacing a light bulb, adjusting the door, replacing the start relay or complete defrosting. However, there are situations when the intervention of a specialist with professional equipment is strictly necessary. Ignoring these cases can lead to repairs becoming economically unfeasible.
First of all, a technician is needed if there is a confirmed freon leak. As mentioned earlier, this requires soldering, vacuuming, and working with chemicals. You will also need a specialist if you hear extraneous metallic knocks inside the housing when the compressor is running - this is a sign of damage to the motor suspension or valves.
You should not try to change the compressor yourself without the skills of soldering copper pipes. Unprofessional soldering may result in a fire or repeated leakage within a month. In addition, replacing the motor often requires a specific tool for rolling pipes.
Is it worth repairing an old refrigerator?
If the refrigerator is more than 10-12 years old and the compressor needs to be replaced or refilled with freon, it is often cheaper to buy new equipment. Repair in this case can amount to up to 70% of the cost of the new unit.
Frequently asked questions (FAQ)
Why did the refrigerator work after defrosting, but after a week it stopped again?
This is a classic sign of a malfunction of the defrost system (No Frost). The ice has melted and stopped blocking the channels, but since the heating element or sensor is not working, the ice builds up again and blocks the airflow. Replacement of faulty elements of the defrosting system is required.
Is it possible to operate the refrigerator if only the freezer is working?
For a short time - yes, to save food. But long-term operation in this mode is harmful to the compressor, which works without stopping due to wear and tear. This can lead to its combustion, which will significantly increase the cost of repairs.
How long does it take to defrost the refrigerator for diagnostics?
To completely defrost the evaporator, which is located inside the housing, it takes at least 24 hours, and preferably 48 hours. Defrosting for 2-3 hours is often insufficient, since the ice deep in the channels does not have time to melt.
Why is the back wall of the refrigerator hot, but warm inside?
This indicates that the compressor is working and the condenser is heating up, but freon does not circulate through the cooling system inside the chambers. Most likely, the capillary tube is clogged or a gas leak has occurred.
How to check if the fan is working in a No Frost refrigerator?
You need to open the freezer door and press the button (or magnet), which usually hides the light from the light bulb. If you don’t hear the noise of the fan when the door is open and the compressor is on, it may be frozen in ice or burned out.