The appearance of an inscription on the display or a characteristic click signaling the start of the defrosting cycle often takes owners of household appliances by surprise. Many users mistakenly believe that defrost mode is a malfunction that requires immediate intervention from a technician or complex re-flashing of the controller. In fact, modern units LG with a system No Frost or Total No Frost are programmed to automatically remove moisture from the evaporator at certain intervals.
However, situations when it is necessary to forcibly interrupt this process or completely disable the function do occur. This may be caused by a malfunction of the sensors when the equipment is “stuck” in the defrost cycle, or by the user’s desire to carry out a deep manual cleaning of the internal chambers. Understanding the operating logic of compressor and the evaporator heater will allow you to avoid panic and competently manage the device.
In this material we will analyze in detail the algorithms of action for various models, explain why the system could go into emergency mode, and provide clear instructions for resetting errors. It is important to distinguish between the normal operation of the automation and a real breakdown that requires replacement Heating element or thermostat.
Reasons for activation and the need to shutdown
Before taking active steps to disable the mode, you need to understand the nature of its occurrence. In normal mode defrosting cycle it is started by the controller after a certain amount of compressor operation or according to a timer. At this moment, the ventilation stops and the heating element located behind the back wall of the freezer is turned on.
The situation requires intervention if the process is delayed or repeated too often. The main triggers for manual cancellation or diagnostics are:
- ❄️ Failure of the defrost sensor, which does not detect heating and keeps the system in an endless cycle.
- 🌡️ Ingestion of a large amount of warm products, which has disrupted the settings thermostat and algorithms.
- 🔌 A short power outage, after which LG could switch to protection or testing mode.
⚠️ Attention: If you see that a “coat” of ice is forming inside the freezer, and the defrosting mode does not start or does not complete, this is a sure sign of a malfunction of the heating element or sensor.
Sometimes users try to forcefully disable the function, wanting to save energy, believing that manual control is more effective. This is a misconception: in models No Frost the absence of automatic defrosting will lead to ice fouling on the evaporator, blocking the air channels and, as a result, failure compressor due to overheating. It makes sense to disable the mode only for diagnosing or eliminating the error.
Soft reset and system reboot
The easiest and safest way to try to get the refrigerator LG out of a frozen state is to perform a full soft reset. Electronics of household appliances, like computers, can accumulate temporary errors in RAM, which leads to incorrect behavior control module.
To perform a “hard” reset, it is necessary to completely de-energize the unit. Simply turning off the button on the case is not enough if it is not the main switch. You must physically unplug the power cord from the outlet. The minimum time that the device should be without voltage is 10–15 minutes. During this time, the capacitors on the control board are discharged, and EEPROM (memory with settings) is cleared of temporary errors.
After turning on the power, the system will conduct self-diagnosis. At this moment, a characteristic relay click or hum may be heard, which is normal. If the defrosting mode was caused by a software failure, after this procedure the refrigerator should return to normal cooling.
☑️ Reboot algorithm
It is important to note that immediately after switching on LG the compressor may not start for some time while conducting system tests. Don't panic and try to turn on the mode Super Cool or other functions in the first minutes. Give the electronics time to calibrate the temperature sensors.
Disablement through the engineering menu and buttons
Some advanced models LG, especially those equipped with a display and function Smart Diagnosis, allow the user to interfere with the operation of the algorithms through hidden menus or button combinations. However, it is worth noting right away: there is no standard “Disable defrosting” button in the user interface, since this contradicts the principle of operation No Frost.
Nevertheless, you can try to reset the error if it is displayed on the screen. Often, the combination of the "Freezer" and "Ice Plus" (or "Fridge" and "Freezer" buttons, held for 3-5 seconds, will reset the display and reset currently active processes. In some modifications, this action also activates entry into the service menu, but without a special remote control or knowledge of the codes, it is better not to enter there, so as not to disrupt the factory calibrations of the inverter motor. If an error indicator is on the display (for example, flashing letters or symbols), try the following sequence: Press and hold the “Raspberry” button (if available) or the “Freezer” + “Ice Plus” combination until a beep sounds. inverter motor.
If there is an error indicator on the display (for example, flashing letters or symbols), try the following sequence:
- Press and hold the "Raspberry" button (if available) or the "Freezer" + "Ice Plus" combination until a beep sounds.
- Release the buttons and wait 10 seconds.
- Check whether the alarm indicator goes off and the cooling cycle has begun.
⚠️ Attention: Uncontrolled changes in parameters in the engineering menu can lead to violation of temperature conditions, which is dangerous for the safety of products and the service life of the compressor.
It is worth mentioning that in new models with support Wi-Fi and control via the application LG ThinQ, remote error reset or diagnostics are sometimes available. Check the status of the device in the application: if a fault code is displayed there, follow the recommendations of the application to resolve it.
What is Smart Diagnosis?
Smart Diagnosis is a self-diagnosis function of LG refrigerators. When activated (usually by holding a button), the refrigerator speaker emits a set of sounds that simulate a modem signal. By bringing the phone with the LG ThinQ application to the speaker, you can read this code and get accurate information about the malfunction on the smartphone screen.
Manual defrosting as a method of turning off the cycle
If the automation fails and the refrigerator is stuck in defrost mode (the heater heats up, but does not turn off) or, conversely, cannot exit it due to ice blocking the sensors, the only reliable way is complete manual defrosting. This is the only option that is guaranteed to reset all cycles and give the system a “rest.”
The process requires time and discipline. You will need to completely empty the chambers of food, unplug the appliance and leave the doors open. The minimum time for complete defrosting and evaporation of moisture from hard-to-reach places where it is located evaporatoris 24 hours. Less lengthy procedures may not produce results if the ice plug inside the case does not have time to melt.
To speed up the process, you can use additional means, but with caution:
- 🪣 Containers with warm (not hot!) water installed on the shelves of the chambers.
- 🧣 Using a fan to blow the interior space (accelerates evaporation).
- 🧽 Thoroughly wiping off moisture as the ice melts.
It is strictly prohibited to use hair dryers, heat guns or sharp objects to chip ice. A directed flow of hot air can deform plastic evaporator box or damage the tubes, and mechanical impact is guaranteed to lead to freon leakage. After all the ice has melted and the water has been removed, leave the refrigerator with the doors open for another 2-3 hours to equalize the temperatures.
Diagnostics of sensors and heating elements
If after manual defrosting and turning on the network the situation repeats (the refrigerator again takes a long time to defrost or does not cool), the problem lies in the hardware. Most often, the temperature sensors or heating element are to blame. In refrigerators LG two main sensors are responsible for the defrosting process: the evaporator temperature sensor and the defrost sensor (defrost thermostat).
Defrost sensor opens the heater circuit when the evaporator temperature reaches a certain value (usually about +10...+15°C). If it is faulty and does not open the circuit, the heater will heat continuously until the thermal protection or timer trips. If it “lies” in the other direction, defrosting may not turn on at all, which will lead to freezing.
Below is a table of common symptoms and probable causes:
| Symptom | Probable reason | Required action |
|---|---|---|
| Error code is on, no cold | Open circuit of the heating element or sensor | Dialing with a multimeter, replacing the element |
| The refrigerator is humming, but does not freeze | The channel is clogged with an ice plug | Full defrosting (24 hours+) |
| Frequent defrosting starts | Temperature sensor malfunction | Replacement of the sensor evaporator |
| Water inside the chamber | Drain hole clogged | Cleaning the drain |
For diagnostics you will need a multimeter. It is necessary to “ring” Heating element for a break (the resistance should be within normal limits, usually hundreds of Ohms) and check the sensors for changes in resistance with temperature changes. If you do not have the skills to work with electrical measuring instruments, at this stage it is better to contact a specialist.
Prevention and operating rules
To minimize the risk of system failures No Frost and to avoid the need to urgently turn off modes, you should adhere to simple operating rules. Technology LG, like any complex electronics, is harmful to sudden voltage drops and overloads.
First of all, make sure the door seals are tight. If the elastic does not fit tightly, warm, moist air enters the chamber. This leads to increased formation of frost on the evaporator, and the normal operating time of the heater may not be enough for complete defrosting. As a result, ice accumulates, blocks the sensors and causes failures in the cycles.
Also important:
- 🥩 Do not load food into the chamber whose temperature is significantly higher than the temperature inside the refrigerator.
- 🚪 Do not keep the doors open for more than 1-2 minutes.
- 🧹 Regularly (once a year) clean the condenser (grid at the back) from dust for better heat exchange.
⚠️ Attention: Installing the refrigerator close to the wall disrupts the air circulation around the condenser, which can lead to overheating of the compressor and failures in the electronics, including false starts of defrosting.
Following these recommendations will extend the life of your refrigerator and ensure stable operation of all systems. Remember that prevention is always cheaper and easier than repair compressor-condensing unit.
Is it possible to permanently disable automatic defrosting on LG?
Technically, it is impossible to disable this function programmatically through the user menu, since it is hardwired into the controller firmware. Physically disconnecting the heating element or sensors will lead to rapid freezing of the evaporator, stopping the cold circulation and breaking the compressor. For models with a drip system (“crying butt”), defrosting occurs naturally when the compressor is turned off, and there is nothing to “turn off” there.
How long does a standard defrost cycle last?
In normal mode, the defrost cycle in refrigerators LG lasts from 15 to 30 minutes. It starts approximately every 8-12 hours of compressor operation. If the process lasts several hours, this indicates a malfunction of the defrost sensor or timer.
What to do if after defrosting the refrigerator does not turn on?
If after a complete 24-hour defrosting and turning on the network, the compressor is silent for more than 40 minutes, and the inside does not get cold, the electronics may have been damaged by a power surge or the start-up relay has failed. Check if the light inside is on and if the fan is running (if you can hear it). If there are signs of life, but no cold, you need a master.
Why does the LG refrigerator click during defrosting?
Clicks can be produced by a thermal relay that turns on the heating element, or by the heating element itself due to thermal expansion of the metal. The air duct damper may also click. If the clicks are loud and accompanied by a crackling sound, it is possible that water in the drainage system has frozen, which bursts when heated, or the plastic is cracking due to temperature changes. Linear Cooling. If the clicks are loud and accompanied by a cracking sound, perhaps the water in the drainage system is frozen and bursts when heated, or the plastic is cracking due to temperature changes.