The situation when you open the refrigerator door and it’s warm inside always takes you by surprise. Food begins to spoil, and there is a strong desire to immediately solve the problem. However, there is no need to panic, since in many cases cause of breakdown it lies in simple things that can be eliminated yourself. Understanding the operating principles of your model will help save time and money when calling a technician.
Before disassembling the unit, it is necessary to eliminate common operating errors. Often the equipment is in good working order, but its operating conditions are violated. Check the tightness of the rubber seals seals and make sure that the door slams completely. If the seal is dirty or deformed, cold air will escape and the compressor will run in vain. It is also worth checking whether the ventilation holes inside the chamber are not clogged with products.
It is important to pay attention to the noise level of the running motor. If you hear a hum, but there is no cold, or there is deathly silence, these are two different scenarios for the development of events. In the first case there may be a problem with the refrigerant, in the second - with the electrics. Next, we will look in detail at what exactly breaks down in the cooling system and how to diagnose it.
Problems with electrical power and thermostat
The first thing to do when a lack of cold is detected is to check the presence of voltage in the network. It’s trivial, but true: sometimes the plugs get knocked out or the plug comes out of the socket. If the control panel lights do not light, check the cord for kinks. In models with electronic control, the lack of power may indicate a burnt-out control unit that requires replacement. If the refrigerator is humming, the light is on, but the temperature does not drop, you should listen to the operation of the thermostat. In mechanical models, the click of the thermostat should be heard when you turn the knob. The absence of a click may mean that the sensor is “stuck” in the open state and does not give the command to start the compressor. Replacing this element is one of the most common procedures in control unit, which requires replacement.
If the refrigerator is humming, the light is on, but the temperature does not drop, you should listen to the operation of the thermostat. In mechanical models, the click of the thermostat should be heard when you turn the knob. The absence of a click may mean that the sensor is “stuck” in the open state and does not give the command to start the compressor. Replacing this element is one of the most common procedures in do-it-yourself repair.
⚠️ Attention: Before any diagnostics of electrical circuits, be sure to disconnect the device from the network. Working with current without the appropriate skills and tools is life-threatening.
In modern models Indesit or Atlant an electronic module is often responsible for temperature regulation. If it fails, the compressor may not start at all or may run without stopping. Checking the contacts and visually inspecting the board for oxides or burnt tracks is the first step in diagnosis.
It is also worth checking the integrity of the wiring inside the case. Rodents or mechanical damage during transportation could disrupt the contact. If you find a frayed wire, it must be insulated or replaced. Do not ignore this stage, as poor contact can lead to a fire.
Faults of the compressor and start relay
The heart of any refrigerator is the compressor. It is this that ensures the circulation of refrigerant throughout the system. If the motor hums but does not start, or starts for a couple of seconds and stalls with a click, the problem lies in the start-up relay or motor windings. Start relay is a small part that provides an impulse to start the motor.
Replacing the relay - procedure simple and cheap. Remove the casing at the back of the refrigerator, disconnect the wires and replace the part with a similar one. However, if after replacing the relay the situation has not changed, and the compressor still does not start or hums, but does not pump, the compressor itself is likely to fail. The table below shows the main symptoms and their probable causes associated with the motor: compressor.
The table below shows the main symptoms and their probable causes associated with the motor:
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| Buzzes, but does not start | Piston group jammed | High (motor replacement) |
| Starts immediately turns off | Faulty starting relay | Low (replacement of relay) |
| Case gets very hot | Interturn short circuit | High (replacement motor) |
| Silence, no reaction | Breakage of winding or wiring | Average (tester test) |
If the compressor requires replacement, it is better to entrust this work to professionals. Replacement will require evacuation of the system and charging with freon, which cannot be done without special equipment. An independent attempt to “revive” the motor with a hammer blow (the “kick” method) can lead to final failure.
Is it possible to repair the compressor yourself?
Theoretically, you can replace valves or gaskets if you have access to them and welding skills. However, in practice, the service life of a repaired compressor rarely exceeds 6 months. It is more economically feasible to buy a new unit or call a technician to replace the entire unit.
Freon leakage and clogged capillary tube
Refrigerant (freon) is a substance that directly cools the chambers. If a microcrack has formed in the system, the gas gradually evaporates. The first sign of a leak is often that the refrigerator runs non-stop, trying to get up to temperature, but there is no cold. The motor-compressor may be hot to the touch.
Clogged capillary tube is another common problem. Oil circulates in the system, which over time can thicken or mix with wear debris, forming a plug. In this case, there is freon, the pressure in the system is high, but there is no circulation. You can identify a blockage by the characteristic gurgling sound or complete silence when the compressor is running.
⚠️ Attention: Freon is odorless and colorless. It is impossible to detect a leak by hearing or smell. The use of a leak detector or soap solution is required (for large cracks).
To eliminate these faults you need:
- 🔍 Find the leak location using special equipment.
- 🔧 Solder the damaged area or replace evaporator.
- 💨 Vacuum the system to remove moisture and air.
- ❄️ Fill the system with new freon strictly according to weight.
It is almost impossible to perform these steps on your own. Attempts to simply “add” freon without looking for a leak will give a temporary effect, after which the problem will return. In addition, different models Liebherr or Beko require different types of refrigerant, and mixing them is prohibited.
Malfunctions of the No Frost system
In refrigerators with the system No Frost ("no frost"), fans provide circulation of cold air. If the fan freezes or is jammed, the cold stops flowing into the chamber, although the evaporator may be frozen. This is often accompanied by extraneous noise or crackling.
Another important element is the defrost heating element. It turns on periodically to melt the ice on the evaporator. If the heating element burns out, ice builds up, blocking the air channels. As a result, the refrigerator hums, but does not freeze. You can check the heating element with a multimeter for resistance.
You should also pay attention to the defrost sensor. If he “lies” and does not give the command to turn on the defrost, the system quickly becomes clogged with ice. This can be seen visually by disassembling the back wall of the freezer. There you will see a “coat” of ice that interferes with the operation of the fan.
The main components of the No Frost system that require checking:
- ❄️ Blowing fan (checking rotation and electrics).
- 🔥 Defrosting heating element (checking the integrity of the thread filament).
- 🌡️ Defrost sensor (checking resistance at different temperatures).
- 🕰️ Defrost timer (in mechanical models).
⚠️ Attention: Do not try to break off the ice with a knife or screwdriver! You can puncture the thin evaporator tubes, causing an immediate freon leak and costly repairs. Use only a hair dryer for defrosting.
☑️ Diagnostics No Frost
Failures in the electronic control module
Modern refrigerators, such as LG or Samsung, stuffed with electronics. The control board is the “brain” of the device. Voltage surges in the network, moisture, or simply a manufacturing defect can damage it. Symptoms can be different: the refrigerator does not turn on, the indicators blink chaotically, or the temperature conditions are off.
Often the problem lies not in the board itself, but in oxidized contacts. Moisture inside the camera or condensation may cause corrosion of the connectors. A visual inspection of the board may reveal swollen capacitors or blackened traces. In some cases, flashing the module helps.
If the control module is faulty, it may not correctly control the operation of the compressor and fans. For example, giving a command to cool when there is no need for it, or vice versa. Diagnostics of electronics requires special knowledge and is often carried out by eliminating other faults.
Mechanical damage and wear of seals
The reason for the lack of cold does not always lie in complex equipment. The rubber seal on the door loses its elasticity over time, cracks or becomes deformed. Warm air enters the chamber through the resulting cracks, and the refrigerator does not have time to cool it.
You can check the tightness in a simple way: hold a sheet of paper between the door and the body and try to pull it out. If the paper comes out easily without resistance, it means that the seal is not tight. In this case, you need to replace it or try to restore elasticity (for example, heating it with a hairdryer if it is simply stiff).
It is also worth checking the door hinges. If they become loose, the door warps and does not close tightly. Adjusting the hinges is a simple procedure that can be done with a screwdriver. Ignoring this leads to constant operation of the compressor and increased energy consumption.
Frequently asked questions (FAQ)
Why does the refrigerator work, but does not freeze after defrosting?
Most likely, an ice jam or air has formed in the system, which interferes with the circulation of freon. It is also possible that during defrosting you damaged the evaporator tubes. Leave the refrigerator turned off for 24 hours. If the problem does not go away, you need a technician to diagnose it.
Is it possible to operate the refrigerator if it does not freeze?
It is strictly not recommended. The compressor wears out, trying to reach temperature, the oil in it overheats and burns out. This can lead to complete engine failure. It is better to turn off the device before repair.
How much does it cost to repair if the refrigerator stops freezing?
The cost depends on the breakdown. Replacing a thermostat or relay is inexpensive. Refilling with freon and finding leaks is in the middle price segment. Replacing a compressor or electronic module is the most expensive procedure, sometimes amounting to up to 50% of the cost of a new device.
Why is there ice in the freezer and heat in the refrigerator?
This is a classic sign of a malfunction of the No Frost system (clogged channels, broken fan) or a freon leak (in two-compressor models). In single-circuit systems, this may indicate that freon circulates only in the freezer, not reaching the main compartment.