Owners of modern refrigeration units LG often face the need to understand the operation of the automatic defrosting system. Many users mistakenly believe that defrost mode can or should be turned off manually to save energy or speed up cooling. In fact, in models with technology No Frost this process is a critical cycle of operation of the compressor and fans.
An attempt to forcefully stop the normal defrost cycle can lead to the failure of expensive electronic components and the formation of ice jams. However, there are situations where the system fails and the user does require intervention, either to perform a complete manual defrost or to diagnose faulty sensors. In this article, we will look in detail at how to correctly manage these processes.
It is important to understand that “disabling defrosting” most often means either switching the device to service mode, or completely de-energizing it for manual defrosting. Incorrect operation of the control panel may block the functionality, so follow the instructions carefully. Below are proven methods for controlling the defrosting system for various series of equipment from the Korean brand.
The principle of operation of the No Frost system in LG refrigerators
The technology No Frostused in refrigerators LGimplies the absence of ice on the walls of the chamber due to the constant circulation of cold air. The evaporator, where the ice actually forms, is hidden behind the back panel of the freezer compartment. Periodically, by a signal defrost timer or the electronic module, the compressor stops and the heating element turns on.
This process is necessary in order to melt the frost accumulated on the evaporator radiator. If this did not happen, the ice would completely block the air circulation channels, and the refrigerator would stop freezing. The system automatically monitors temperature and operating time, starting a defrost cycle usually every 8-12 hours.
The user does not see this process, as it occurs in a hidden technical compartment. The duration of the cycle depends on the amount of ice and can range from 15 to 40 minutes. At this time, the fans do not work so as not to blow warm air through the chamber.
⚠️ Attention: An attempt to interrupt the defrosting cycle by abruptly turning off the power may result in water from melted ice not having time to drain into the drain pan and freezing inside the case, damaging the mechanical parts.
This process is controlled by electronic module, which receives data from several temperature sensors. They are the ones who tell the refrigerator’s “brain” when to start heating the evaporator and when to stop heating. In old models, a mechanical timer was responsible for this, in new ones - a complex logical chain.
Is it possible to completely disable automatic defrosting
In the standard user menu of refrigerators LG there is no function for completely disabling the automatic defrosting system. This was not done by manufacturers by chance: working without defrosting in systems No Frost is technically impossible in the long term. If you turn off this mode, the evaporator will become covered with ice in a few days.
There is a concept of “service mode” or diagnostic mode, which is used by technicians during repairs. In this mode, you can forcefully start or, conversely, stop certain nodes, but this requires specific combinations of buttons. For conventional models with a panel Smart Diagnosis or Touch Display such actions can be dangerous without the appropriate equipment.
- ❄️ Complete shutdown of the defrost cycle will lead to freezing of the fan and its subsequent breakdown.
- ⚡ defrost heating element, remaining constantly turned on (if forcibly activated), can melt the plastic parts of the case.
- 🧊 Blocking the drainage system with ice will cause water to leak into the refrigerator compartment or onto the floor.
If your goal is to save energy, then turning off defrosting will not have an effect. The defrost cycle consumes relatively little energy compared to running a compressor. It is much more important to monitor the tightness of the door seals.
How to manually defrost an LG refrigerator
The only safe way to “turn off” automatic defrosting is to completely turn off the power to the unit for general cleaning or defrosting. This is required if the system has failed or you are planning a long absence. Before starting the procedure, be sure to remove all food.
First, disconnect the refrigerator from the power supply by unplugging the plug from the outlet. Leave the doors open. Depending on the thickness of the ice layer (if the system fails), the process can take from 4 to 24 hours. It is strictly forbidden to speed up the process with a hairdryer or knife - this will damage the cooling circuit.
☑️ Manual defrosting checklist
After all the ice has melted, you need to thoroughly wipe the internal surfaces and, most importantly, clean the drainage hole. It is located on the back wall of the freezer. A blockage here is a common reason why water begins to flow into the chamber instead of the pan.
You can turn on the device only after it has been turned off for at least 2-3 hours. This is necessary to equalize the pressure in the system and evaporate condensation from the electrical contacts. A sudden switch-on after defrosting can cause a short circuit.
Diagnostics and reset of defrost system errors
If the refrigerator LG stopped freezing or, conversely, began to constantly buzz and not turn off, there may be an error in the defrost system. The electronics could detect a malfunction of the sensor or heating element and go into emergency mode. In this case, an error reset is required.
For most modern models with a digital display, the “hard reset” method is used. Unplug the refrigerator for at least 15-20 minutes. During this time, the capacitors on the control board will discharge and the error memory will be cleared. After turning on, the system will start self-diagnosis.
| Error code | Value | Probable cause | Action |
|---|---|---|---|
r F |
Defrost error | Defrost sensor or heating element is faulty | Checking the heater circuit |
d H |
High temperature | Door open or sensor failure | Checking the seal |
E r FF |
Fan motor error | Fan frozen | Full defrost 24 hours |
E r dH |
Heater error | Defrost heating element burned out | Replacing the heating element |
If after resetting the error appears again after several cycles of operation, then the problem is hardware in nature. Most often, the sensor itself or the sensor that records the temperature of the evaporator fails. In such cases, software disabling the mode will not help - the part needs to be replaced. heating element or a sensor that records the temperature of the evaporator. In such cases, software disabling the mode will not help—the part needs to be replaced.
⚠️ Attention: Error codes may vary depending on the series of the refrigerator LG. Look for the exact decoding for your model in the technical documentation or on the sticker inside the chamber.
Checking the serviceability of the heating element and defrost sensors
For those who have the skills to work with a multimeter, a procedure for checking defrost system components is available. Access to them is usually blocked by a rear panel in the freezer. Before removing the panel, make sure that the device is unplugged.
First of all, the integrity of the defrosting heating element is checked. The resistance of a working heater is usually between 200 and 300 ohms. If the multimeter shows one (open), it means that the spiral is burnt out and requires replacement. Also visually inspect the contacts for oxidation.
The defrost sensor (thermostat) works differently: at room temperature it should “ring” (have zero resistance or close the circuit), and when cooled (for example, if you put it in the freezer) it should open. If the sensor is “stuck” in one position, the control module will not receive a signal to stop heating or start it.
Where is the defrost heating element?
The defrosting heating element in LG refrigerators is located behind the rear plastic wall of the freezer, directly under or around the aluminum evaporator radiator. To gain access, you need to remove the shelves, drawers and unscrew the panel fastening screws.
A frequent problem is not the breakdown of parts, but the banal oxidation of contacts in the connectors due to humidity. Before replacing expensive components, try cleaning the contact groups with alcohol and tightly connecting them back. Sometimes this restores the operation of the system.
Setting temperature modes and their influence
An incorrectly set temperature can simulate problems with defrosting. If you set the freezer temperature too low (for example -24°C or -25°C), the compressor will run almost non-stop. In this mode, the system may not have time to start the defrost cycle at the required time.
The optimal value for the freezer is the range from -18°C to -20°C. For the refrigerator compartment - from +3°C to +5°C. With these settings, the system No Frost works most efficiently, balancing between cooling and periodic heating of the evaporator.
Function Express Freeze (Super Freeze), if activated, also changes the operating algorithm. In this mode, the refrigerator freezes food as a priority, ignoring some maintenance cycles. Do not keep this mode on all the time - only if you need to quickly freeze fresh food.
In some models with the function Smart ThinQ you can monitor the operation of the refrigerator via a smartphone. The application may notify you that the door has been open too long or the temperature inside has risen, which also affects the frequency of defrosting cycles.
Common problems and how to fix them
One of the most common problems is the situation when the refrigerator hums, but does not freeze, and a layer of ice is visible inside the freezer in only one corner. This is a classic sign that the defrost system has failed and ice has blocked the air passage. In this case, complete manual defrosting during the day helps.
Another problem is water in the refrigerator compartment on the floor or in the lower drawers. This indicates that the drainage hole is clogged with crumbs or ice, and the water from the snow that melted during defrosting has nowhere to drain. Cleaning the drainage with a soft wire or brush usually solves the problem.
- 🔊 Loud crackling or clicking noises during operation often mean expansion of the plastic during the defrost cycle - this is normal.
- 💧 Puddles under the refrigerator may be a result of the drain tray on the compressor being displaced.
- 🌡️ Uneven cooling is often treated by redistributing products that do not block the ventilation holes.
If after all the manipulations the problem returns after 1-2 weeks, replacement is most likely required. defrost sensor. This element is inexpensive, but its replacement requires partial disassembly of the freezer.
⚠️ Attention: Technical characteristics and location of elements may vary depending on the year of manufacture of the model. Always check the official diagram for your specific serial number.
FAQ: Frequently Asked Questions
Why does the LG refrigerator make a loud noise every few hours?
This sound is normal for systems No Frost. It occurs due to thermal expansion and contraction of the plastic parts of the housing and evaporator during cooling and defrosting cycles. If the cracking sound is not accompanied by a cessation of cooling, there is nothing to worry about.
How often do you need to defrost the LG No Frost refrigerator manually?
Technically, the system never needs to be defrosted, it does it itself. However, once a year (or if foreign odors appear), it is recommended to carry out a complete defrosting and washing for hygiene and drainage cleaning. No Frost You never need to defrost it, it does it itself. However, once a year (or if foreign odors appear) it is recommended to carry out a complete defrosting and washing for hygiene and drainage cleaning.
What to do if after defrosting the refrigerator does not turn on?
Let it stand turned off for another 2-3 hours. There may be condensation left inside. If there is still silence after this, check the socket and plug. If there is power, but there is no reaction, the control module or the start relay may have failed.
Is it possible to speed up defrosting with a hairdryer?
It is strictly not recommended to direct the hot jet of a hairdryer onto the ice inside the chamber. A sharp temperature change can lead to cracks in the plastic case and, worse, to damage to the evaporator tubes through which the refrigerant circulates.
Is the drain frozen if there is an ice slide under the freezer?
Yes, this is a sure sign. The water from defrosting does not go into the pan above the compressor, but flows out through the lower technological hole and freezes. It is necessary to clean the drainage channel with hot water or a special cable.