The situation when the freezer suddenly stops freezing in the refrigerator always takes you by surprise. The products begin to quickly deteriorate, and an unpleasant odor or, conversely, an icy crust appears inside. Primary diagnosis at home allows you to determine how serious the breakdown is and whether you can deal with it yourself, or whether you need to call a specialist.
Most often the problem lies in a violation of the tightness of the system or malfunctions of the control electronics. If you notice that temperature indicator flashing, and the food in the upper compartment has become soft, do not hesitate. In this material we will analyze in detail all possible reasons, from the most banal to the critical, and give an algorithm of actions.
It is important to understand that modern refrigerators, such as LG No Frost or Boschhave a complex refrigerant circulation system. Malfunction of any unit can lead to a stop in cooling in the lower chamber, even if the upper part continues to operate normally.
Checking the temperature conditions and settings
Before looking for complex technical faults, it is necessary to eliminate the human factor. Often, users accidentally touch the temperature controller or change settings in the electronic module. Make sure that the mode Super Freeze (super freeze) has not been activated for a long time, which can lead to the opposite effect in some models.
Check whether the temperature mode is set correctly. For normal operation of the freezer, the temperature should not be higher -18°C. If you have recently defrosted or washed the refrigerator, the system requires time to return to operating mode.
⚠️ Attention: In some electronically controlled models, settings are reset during power surges. Check to see if the settings have returned to the factory settings.
It is also worth paying attention to the tightness of the door. If the rubber seal is dirty or deformed, warm air enters the chamber, and the compressor simply does not have time to freeze out excess moisture. This is especially true for older models, where the rubber loses its elasticity.
Problems with the seal and seal of the chamber
One of the most common reasons why the freezer does not freeze is a violation of the tightness of the circuit. Warm air penetrating inside contains moisture, which instantly turns into frost on the walls and products. Over time, the layer of ice becomes so thick that it blocks the circulation of cold air.
Check the condition of the rubber seal around the entire perimeter of the door. There should be no cracks, tears or places where it comes away from the body. Dirt and grease reduce adhesion, so regular cleaning is a must.
There is a simple test with a sheet of paper: hold the sheet with a door and try to pull it out. If the paper is pulled out too easily or, conversely, breaks due to strong resistance, it means that the pressure is broken. In the first case, the seal needs to be replaced, in the second, the hinges need to be adjusted.
- ❄️ Wipe the seal with a soft cloth soaked in soapy water to remove grease.
- 🔍 Inspect the corners of the door for mechanical damage.
- 📏 Check evenness of installation of the refrigerator using a building level.
Malfunctions of the No Frost system and sensors
In refrigerators with the system No Frost for The fan circulates cold air, and the defrost system removes moisture. If the fan freezes or is jammed, cold air simply does not enter the chamber, although the compressor may hum normally.
A frequent problem is failure of defrost sensor or Evaporator heating element. In this case, an ice coat builds up on the evaporator, which blocks the air supply channels. Externally, the freezer may be clean, but behind the back wall there is an ice monolith.
| Symptom | Possible cause | Method checks |
|---|---|---|
| Humming without cold | Fan jammed | Listen to noise behind the back wall |
| Ice on the back wall | Faulty defrost heating element | Ring with a multimeter |
| The compressor does not turn on | The temperature sensor has burned out | Resistance measurement |
Diagnostics often require partial disassembly of the internal panel of the freezer. If you find a thick layer of ice on the evaporator, this is almost guaranteed to indicate problems with the defrosting system.
How to defrost a No Frost system correctly?
Unplug the refrigerator for at least 12-24 hours. Keep doors open. Do not use a hairdryer or hot water to speed up the process, as this may damage the plastic and evaporator tubes. After defrosting, wipe everything dry before turning it on.
Refrigerant (freon) leakage
If the compressor runs continuously, hums, but there is no cold anywhere (or it is very weak), most likely it has occurred freon leak. The refrigerant circulates in a closed circuit, and if a micro-hole is formed somewhere, the gas comes out.
The causes of leaks can be different: corrosion of the metal circuit (often in the foamed part of the body), mechanical damage during transportation or factory soldering defects. It is difficult to visually find the location of the leak, since freon is colorless and odorless.
⚠️ Attention: Filling yourself with freon without eliminating the cause of the leak is pointless. The gas will leave again after a short time. Professional diagnostics with a leak detector are required.
Sometimes the location of the leak becomes the heating circuit around the door perimeter. In this case, condensation or rust may appear on the outside of the case, around the freezer.
Failure of the compressor or start relay
The compressor is the “heart” of the refrigerator. If it fails, there will be no cold. Often the problem lies not in the motor itself, but in start relaywhich supplies the impulse for starting. If the relay is burned out, the compressor will hum for a few seconds, click and turn off.
Signs of a compressor malfunction:
- 🔊 Loud knocking or clanging when trying to start.
- 🔥 Strong heating of the motor housing (be careful, you can get burned!).
- ⚡ Constant activation of the protection or knocking out plugs.
Replacing a compressor is a complex procedure that requires evacuation of the system and charging with freon. It is almost impossible to do this with your own hands without special equipment.
☑️ Compressor diagnostics
Clogged capillary tube
Another technical reason for the lack of cold is clogged capillary tube. Oil circulates inside the system, which over time can thicken or mix with breakdown products, forming a plug. Freon cannot pass through the narrow section of the tube, and the cooling cycle is interrupted.
Symptoms of a blockage are similar to a leak: the compressor works, but there is no cold. However, in this case, the condenser grille at the back of the refrigerator may be only partially cold or remain warm unevenly.
To remove the blockage, technicians use the method of pressing with nitrogen or replacing the filter-drier. This is a job for the service center.
Failures in the electronic control module
In modern models such as Samsung or Indesit with electronics, the control module is responsible for all processes. A power surge in the network can damage the elements of the board, and it will stop sending a signal to start the compressor or fan.
Sometimes the problem is solved by completely rebooting the system. To do this, you need to unplug the refrigerator from the outlet for 15–20 minutes. If after turning on the error repeats, diagnostics of the board will be required.
Pay attention to the indication: many models have error codes that are displayed or flash in a certain way. The decoding of the code can be found in the instructions for your model.
What to do if there is a lot of ice in the freezer, but the food does not freeze?
This is a classic sign of a heat transfer disorder. Most likely, the layer of ice on the evaporator has become a heat insulator. A complete defrost (minimum 24 hours) is required to thaw hidden cavities. If after defrosting the problem returns after 1-2 weeks, it means that the defrost sensor or heating element is faulty.
Is it possible to operate a refrigerator if it does not freeze well?
For a short time - yes, but you can’t work like that for a long time. The compressor will work hard, trying to gain temperature, which will lead to overheating and eventual breakdown. In addition, bacteria quickly multiply in a warm freezer.
Why does it take a long time for a refrigerator to get cold after defrosting?
After a long defrost, the system takes time (from 2 to 12 hours depending on the model and load) to return to normal. Do not load the chamber with warm foods at once - this will increase the time for temperature stabilization.