A sudden shutdown of the refrigerator LG often confuses the owner, especially when the food inside is already starting to melt. One of the common reasons for this situation is a burnt out fuse, which protects the electronic board from power surges in the network. Understanding exactly where it is located and how to check it can save time waiting for a technician.
Searching for this element requires partial disassembly of the unit, since manufacturers hide it in hidden places to protect it from accidental damage. In this article, we will analyze in detail the possible locations of the protective element in various models Side-by-Side and classic two-chamber refrigerators of the Korean brand.
It is worth noting right away that simply replacing a part does not always guarantee a solution to the problem if the root cause of the power surge is not eliminated. Electrical circuit could have suffered due to problems with wiring or unstable operation compressor, so diagnostics must be comprehensive.
Main locations of protective elements
In refrigerators LG the design may differ significantly depending on the series and year of manufacture of the device. Most often, engineers place a fuse link or thermal relay in the zone compressor compartmentlocated at the lower rear of the unit. It is here that the concentration of heat and vibration is highest, which requires reliable protection.
The second popular place is the control unit, which can be located either behind or inside the chamber, behind the decorative panel. In modern models with the No Frost system, the fuse is often integrated into the evaporator defrost heater circuit. You can find it by reaching the evaporator itself, hidden behind the back wall of the freezer.
⚠️ Attention: Before starting any work to find the fuse, be sure to disconnect the refrigerator from the power supply. Working with live electrical wiring is deadly and can lead to electric shock.
Sometimes the protective element is hidden in the cable channel or at the point where the power wire enters the device body. This is typical for models where the control board is located separately from the motor. A visual inspection of all available connectors and wiring harnesses may provide a clue if the external units do not contain the part you are looking for.
Diagnosing a fault with a multimeter
Before disassembling half of the refrigerator, you need to make sure that the problem really lies in the fuse. To do this, you will need multimeterconfigured for dialing or resistance measurement mode. Without this device, accurate diagnosis is impossible, since visually the integrity of the fuse link can rarely be determined.
The verification process begins with removing the suspected element from the circuit. If you test the defrost thermostat, its contacts should "ring" (show close to zero resistance) at room temperature. If the device shows one or infinity, it means that the circuit is broken and the element requires replacement.
- 🔌 Unplug the refrigerator from the outlet and remove the back cover of the compressor compartment.
- 🔍 Find the wires going to the intended installation location of the fuse and disconnect the connector.
- 📟 Attach the multimeter probes to the contacts of the element and follow the readings on the screen.
- 🔄 If the resistance is infinite, replace the part with a similar one with the same characteristics.
Checking them may require heating or cooling the element, which complicates the diagnostic procedure at home.
Why does the fuse blow?
A frequent cause of failure is not a power surge in the network, but a short circuit in the defrost heater itself. If you replace only the fuse without checking the heating element, the new element will also burn out in a short time. Always check the resistance of the heater, it should be within 200-400 Ohms.
Replacing the fuse in the control unit
If the diagnostics showed that the protective element is on electronic board, the replacement procedure becomes more delicate. The control unit in refrigerators LG is usually filled with compound or covered with a plastic casing, which requires care when opening.
To access the board, you often need to remove the top cover of the case (for some models) or dismantle the unit completely by unscrewing the mounting screws. Inside you will see green or blue textolite with radio components. The fuse here looks like a small glass bulb with a thread inside or a black rectangular component.
Replacing such an element requires soldering skills. You will need a soldering iron, solder and, preferably, a soldering station with tin extraction. The old fuse is soldered off, and a new one with identical current and voltage parameters is installed in its place.
☑️ Tools for replacement on the board
After soldering, it is extremely important to remove flux residues, since they can be hygroscopic and cause corrosion of the contacts over time. The board must be absolutely dry and clean before being reinstalled.
Specifics of replacement in the No Frost system
In systems No Frost the defrost fuse (thermal fuse) plays a critical role. It is installed directly on the evaporator tubes or near the heater. Its task is to break the circuit if the temperature in the defrost chamber exceeds a safe limit, preventing a fire.
To get to this unit, you must:
- Completely defrost the refrigerator within 24 hours.
- Remove the back panel inside the freezer.
- Remove the fan (if it interferes with access).
- Find the sensor and fuse attached to the evaporator.
Often the thermal fuse and temperature sensor are fixed in the same plastic case or connected by a twist wrapped with electrical tape. When replacing, it is important to ensure the tightness of the connection so that moisture does not get inside the contacts, which can cause oxidation.
| Element type | Location | Failure symptoms | Operation temperature |
|---|---|---|---|
| Thermal fuse | On the evaporator | No cold, ice freezing | 72°C - 85°C |
| Fuse link (network) | Cable input / Board | The refrigerator does not turn on | Depends on the rating |
| The compressor thermostat | On the compressor | It buzzes, but does not start | 135°C - 145°C |
| Fan fuse | Air duct | Noise, slight cold | N/A |
⚠️ Attention: Never use “bugs” (replacing the fuse with a piece wire) in refrigerators LG. This removes the protection and can lead to a wiring fire or failure of an expensive compressor.
Compatibility and characteristics table
When selecting a new part, it is important to focus not only on appearance, but also on technical characteristics. Using an element with a lower current rating will lead to its instant combustion, and with a larger one - to a lack of protection.
Below is a table with approximate data for popular series of refrigerators LG. However, always check the markings on the burnt element, since different components may be used within the same series.
Pay attention to the response temperature for thermal fuses. Installing an element with a lower cut-off temperature will cause the defrost system to turn off prematurely and the ice will not have time to melt.
Common mistakes during self-repair
Independent repair of household appliances is fraught with risks, and inexperienced technicians often make common mistakes. One of them is ignoring the cause of burnout. If voltage surge was caused by a breakdown of the compressor insulation, replacing the fuse will not help.
Another mistake is the use of low-quality analogues. Cheap Chinese fuses can have a spread of parameters up to 20%, which is unacceptable for precision electronics LG. It is better to use original spare parts or certified analogues from well-known brands.
- ❌ An attempt to replace a part without disconnecting from the network.
- ❌ Installing a fuse with a high rating "just in case".
- ❌ Poor insulation of wire twists after replacing the thermal fuse.
- ❌ Ignoring checking other circuit elements (heating elements, sensors).
They also often forget about grounding. If the refrigerator is not grounded, any current leakage can lead to incorrect operation of the electronics and false protection triggers.
Prevention and safety measures
To minimize the risk of blown fuses, it is recommended to use a voltage stabilizer, especially in homes with an unstable electrical network. Sudden voltage drops are the main enemy of the delicate electronics of modern refrigerators.
Regular defrosting and cleaning of the drainage system also contributes to the normal operation of the system. No Frost. If the water does not drain, it can freeze in unnecessary places, putting a strain on the heaters and causing them to overheat.
⚠️ Attention: The design of refrigerators may vary depending on the year of manufacture. The locations of the elements indicated in the article are relevant for most models, but may differ in new modifications. Always check the technical documentation for your device.
Following operating rules, such as not opening the door for a long time and not putting hot food in, reduces the load on the compressor and defrosting system. This indirectly prolongs the life of the protective elements of the circuit.
Can I use a fuse with a different rating?
It is strictly not recommended. Using an element with a high response current will deprive the circuit of protection, and in the event of a short circuit, the board or wiring itself will burn out. A lower rating will lead to constant shutdowns.
Why does the LG refrigerator hum but does not cool after replacement?
This may indicate a malfunction of the compressor start relay or the motor itself. It is also possible that there is no freon in the system due to a leak, or the capillary tube is clogged. The fuse may have nothing to do with it.
Where to buy an original fuse for LG?
It is best to order original spare parts from authorized service centers or specialized stores of spare parts for household appliances. In the markets there is a high risk of buying a low-quality replica.
How much does it cost to replace a fuse in a service?
The cost consists of the price of the spare part and the work of the technician. On average, a visit and diagnostics can cost from 500 to 1,500 rubles, plus the cost of the element itself. Replacing it yourself saves money, but requires skills.
Can a fuse burn out simply from old age?
Theoretically, yes, since the metal degrades over time, but this is rare. In 95% of cases, combustion is caused by an external factor: a power surge, overheating or a short circuit in the load.