The situation when LG refrigerator starts to work in enhanced mode is familiar to many owners of this equipment. Instead of the usual hum and periodic activation of the compressor, the unit hums almost continuously, and the products in the main chamber are covered with an ice crust. This is not just an inconvenience, it is a signal that the control or thermoregulation system has failed. Modern models, even with the system No Frostcan suffer from freezing if one of the circuit components fails.
Ignoring the problem can lead to spoilage of supplies, increased electricity bills and, ultimately, failure of an expensive compressor. In this article we will analyze in detail the mechanics of the process, the causes of ice build-up and how to eliminate them. You will learn how to distinguish a software failure from a serious breakdown and when it is worth calling a technician and when you can handle it yourself.
It is important to understand that refrigeration equipment LG is equipped with complex electronics that require accurate diagnostics. Before disassembling the unit, it is necessary to make a number of simple observations. Often the answer lies in the little things that the user overlooks in the daily rush.
Faults of the thermostat and temperature sensors
The most common reason why LG refrigerator it gets very cold is a failure of the thermostat or temperature sensor. It is this element that is responsible for sending a signal to the compressor to stop when the set temperature is reached in the chamber. If the sensor “lies” and shows that it is warm inside, the motor will work until everything turns to ice. In mechanical models this is a thermostat, in electronic models it is a digital sensor.
Diagnostics of the thermostat in models with mechanical control is often carried out by elimination. If, when turning the regulator knob to the “0” or “Off” position, the compressor does not turn off, it means that the contacts are stuck or the mechanism has broken down. In modern models with a display Smart Diagnosis may display an error code indicating a sensor malfunction.
⚠️ Attention: Before replacing any electrical components, be sure to disconnect the device from the power supply! Working with 220V voltage requires compliance with safety regulations.
Electronic systems are characterized by sensor calibration failure. It may be physically intact, but transmit incorrect data to the control board. In this case, you need to replace the element with a new one that is compatible with your model. Independent soldering of sensors often does not give long-term results, since the tightness of the connection is broken.
An indirect sign of a problem with the thermostat is the lack of cyclical operation. The motor hums without interruption, even if you turned off the light in the chamber and did not open the door for several hours. Normal operation involves periods of rest, during which the temperature is maintained by the inertia of the cold.
Problems with the No Frost system and defrosting
Owners of units with the system No Frost often face a paradoxical situation: everything is frozen in the freezer compartment, but in the refrigerator compartment, on the contrary, it is warm, or cold air blows too intensely, freezing food in back wall. This indicates a violation of air circulation. The system works on the principle of forced airflow, and if the damper that regulates the air supply is stuck in the open position, cold will flow constantly.
Another common scenario is a malfunction of the defrost system. The evaporator heating element, defrost timer or defrost sensor may fail. As a result, a huge “coat” of ice grows on the evaporator, which is hidden behind a plastic panel. The fan begins to drive air through this ice lump, which has a temperature significantly lower than the set one, which leads to freezing of the products.
- ❄️ Air duct damper: The drive motor is mechanically stuck in the open position or the drive motor has burned out.
- 🌡️ Defrost sensor: Does not see ice on the evaporator and does not start the cycle defrosting.
- 🔥 Heating element: The heating element has burned out, the ice does not melt, blocking the channels.
- 💨 Fan: The blades are frozen to the body or the motor is out of order.
To test this hypothesis, it is necessary to completely defrost the refrigerator. Unplug it for at least 24 hours (preferably a day), leaving the doors open. If, after turning it on in normal mode, the problem disappeared for 1-2 weeks and then returned, the problem is definitely in the defrost system. Ice will accumulate again and block the operation of the system.
☑️ Diagnostics of the No Frost system
Refrigerant leakage and compressor operation
Many people mistakenly believe that if there is a freon leak, the refrigerator stops freezing at all. However, at the initial stage of the leak, the opposite effect is observed - the unit freezes too much. The compressor, trying to compensate for the lack of refrigerant and reach the set temperature, works non-stop for wear and tear. The pressure in the system drops, the boiling point of freon shifts, and the temperature in the evaporator becomes extremely low.
Visually this can be seen by characteristic freezing. Often an ice crust appears only in one place - where the leak occurred, or the entire back wall freezes to the state of “monolithic ice”. In this case, the motor-compressor can become very hot, since it is not designed for round-the-clock operation without rest cycles.
Long-term operation in this mode is critical for the engine. The lubricant in the compressor cokes, the friction of the parts increases, and as a result, the expensive unit burns out. Therefore, if you notice that the refrigerator has been working non-stop for several days, and the temperature inside has dropped below normal, this is a reason to immediately call a technician to find a leak and refuel.
| Symptom | Probable cause | User actions |
|---|---|---|
| Buzzing constantly, ice on the back wall | Freon leak or jammed thermostat | Defreeze, call a technician |
| Ice only at the duct inlet | Faulty damper or sensor | Check damper, replace the sensor |
| Frost around the entire perimeter of the evaporator | Failure of the defrost cycle | Check the heating element and timer |
| The compressor is hot, does not turn off | Wear compressor or leak | Urgent repair |
Why can’t you ignore the operation of the compressor 24/7?
Continuous operation leads to overheating of the motor windings. The oil, which is supposed to lubricate the rubbing pairs, loses its properties at high temperatures. As a result, the compressor may jam, and its replacement will cost 60-70% of the cost of a new refrigerator.
The influence of the “Super Freeze” mode and settings
Sometimes the cause of extreme cold is trivial and lies in the actions of the user himself. The function Super Freeze (Super Freeze) is designed for quick freezing of large quantities of fresh food. When this mode is activated, the refrigerator ignores sensor readings and operates at maximum power for a set time (usually 24 to 72 hours) or until manually turned off.
If you accidentally activated this function (for example, children pressed buttons on the control panel or there was a power surge that reset the settings), the refrigerator will freeze until the mode is deactivated. The corresponding indicator usually lights up on the display, but in models without a screen this may only be indicated by a characteristic sound or a flashing light.
It is also worth checking the temperature settings. Some LG electronically controlled models allow you to set the temperature manually. If the value is set to a minimum (for example, +1°C or -24°C in the freezer), the unit will try to achieve these values at any cost. Standard recommended values: +3...+5°C for the refrigerator compartment and -18°C for the freezer.
⚠️ Attention: Prolonged use of the “Super Freeze” mode unnecessarily leads to increased energy consumption and accelerated wear of the compressor. Use it only when loading the chamber with fresh food.
To reset the settings, try unplugging the refrigerator for 10-15 minutes. This will reset the electronic control module. If after turning on the parameters returned to the factory settings, and the problem disappeared, the problem was a software failure of the controller.
Violation of tightness and seals
It would seem that if warm air gets into the chamber due to a loosely closed door, the refrigerator should work worse. But the logic of the automation is as follows: it “sees” the temperature increase and turns on the compressor at full power to compensate for the heat gain. As a result, excess cold forms inside, accompanied by powerful icing in places where moisture enters.
Rubber seal Over time, it loses its elasticity, cracks or becomes dirty. Even a microscopic gap of 1-2 mm creates a constant flow of warm, moist air. The moisture instantly condenses and freezes on the back wall or food. If you see that ice is forming unevenly, namely on the side of the hinges or the corner of the door, the problem is in the tightness.
You can check the seal with a simple test with a sheet of paper. Clamp the sheet with the door around the perimeter. If it pulls out easily, without resistance, then the pressure is insufficient. Also inspect the rubber for tears and dirt. Dirt often interferes with the tight fit of the magnetic tape.
- 🧼 Contamination: Wipe the seal with a soft sponge and soapy water.
- 🌡️ Loss elasticity: Try to warm the rubber with a hairdryer (carefully!) or replace it.
- 🔩 Door misalignment: Adjust the hinges if the door is sagging.
- 📄 Foreign objects: Check if anything is interfering with closing.
It is also important to consider the load on the shelves. If food is placed too tightly against the back wall, it may restrict air circulation. In areas of stagnation of cold air, the temperature can drop significantly below the set temperature, causing local freezing.
Failures in the electronic control module
The “brain” of the LG refrigerator is the electronic control module. It is he who receives signals from all sensors and gives commands to actuators. If resistors on the control board have burned out, contacts have oxidized, or a software glitch has occurred, it may send incorrect signals. For example, the command to turn on the compressor may be received constantly, ignoring data about low temperatures.
Often such failures occur after power surges in the network. Even if the refrigerator continues to work, its logic may be broken. In some cases, flashing the module helps, but more often it requires replacing the board or repairing specific elements (relays, capacitors) on the board.
Diagnostics of the module at home is difficult and requires special knowledge in electronics. However, if you notice that the display blinks, shows chaotic symbols, or does not light up at all, while the refrigerator continues to freeze intensely, the problem is almost certainly in the electronics.
⚠️ Attention: Power surges are the main enemy of refrigerator electronics. To protect expensive equipment, it is recommended to use a voltage stabilizer or surge protector of good quality.
Repairing the control module is a task for professionals. An independent attempt at soldering without a diagram and experience can lead to the final failure of the board. If suspicion falls on the electronics, it is better to contact an authorized service center.
Is it possible to use a refrigerator with a faulty module?
Technically, it is possible if it just freezes. But the risk of a sudden stop or, conversely, continuous operation, which will kill the compressor, is very high. This is a game of roulette with an expensive prize.
Frequently asked questions (FAQ)
Why is the LG refrigerator freezing in only one corner?
This is a classic sign of poor air circulation or local cold leakage. Check to see if food is pressed against the back wall in this area. Also inspect the door seal near this corner to see if it is not sealing tightly. If we are talking about a No Frost freezer, the air supply channel to this particular area may be clogged.
How long should defrosting last to fix the problem?
It takes at least 24 hours for the ice in the hidden channels of the No Frost system to completely thaw. Defrosting for 2-3 hours is often insufficient, since the ice plug in the depths of the evaporator does not have time to melt, which leads to a rapid repetition of the problem.
Can a refrigerator get very cold in the summer due to the heat in the room?
Yes, high ambient temperature forces the compressor to work longer and more often to remove heat. However, he should not freeze food into stone. If in summer the temperature inside has dropped below normal, check the settings and cleanliness of the condenser (grid at the back), which may be clogged with dust.
What to do if after defrosting the problem returns after 2 days?
This is an accurate indicator of a malfunction of the defrost system (heating element, sensor, timer) or freon leakage. Short-term defrosting only temporarily eliminates the symptom, but not the cause. Diagnostics by a specialist is necessary.
Is it dangerous to store frozen foods?
For most products, deep freezing is not dangerous, but it changes their structure. Vegetables and fruits will turn into porridge after defrosting. Dairy products may separate. Meat and fish retain their properties better, but prolonged freezing at too low temperatures can lead to “burn” of the surface and loss of taste.