Extraordinary noise, humming or complete cessation of cold air circulation in the chamber LG No Frost often indicate a malfunction of the blowing system. In such cases, owners are faced with the need to diagnose or replace evaporator fan. This part is responsible for the forced movement of air masses through the evaporator radiator, ensuring uniform cooling of the entire volume.
The dismantling process requires care, since the plastic elements of the housing can be fragile, and electrical connections can be sensitive to mechanical stress. Before starting work, it is important to understand that refrigerator design different series may differ, so a visual inspection before disassembly is required. We will analyze a universal algorithm of actions suitable for most models of the brand.
Incorrect operation of this unit often leads to the formation of a snow coat in one corner of the chamber or, conversely, to drying out of food due to lack of circulation. If you hear a crackling sound that sounds like a propeller running on ice, or a hum that comes and goes, the problem most likely lies in the impeller or bearing of the engine. Timely intervention will avoid more serious repairs to the compressor.
⚠️ Attention: Before starting any work on disassembling the refrigerator, be sure to disconnect the device from the power supply. Working with live electrical wiring and mechanisms is deadly and can lead to a short circuit.
Diagnostics of a fan malfunction
Before proceeding with physical disassembly, you must make sure that the problem lies with the fan. Often users mistakenly blame the blower motor, although the reason may lie in ice freezing on the dampers or a malfunction of the defrost heating element. Primary diagnosis is carried out aurally and visually, without removing the panels.
Open the freezer door. In good condition, when the door is open, the fan should stop (if the door limit switch is working). If you hear how it continues to work, or, conversely, does not start when closed, this is the first sign of a problem. Also pay attention to the nature of the noise: a metal clang indicates a broken bearing, and an intermittent hum indicates that the impeller is jammed with ice.
- 🔊 Extraneous sounds: Creak, howl or knocking coming from the depths of the rear wall of the chamber.
- ❄️ Weak airflow: No sensation of cold flow air when the door is open.
- 💡 Indication: The emergency temperature indicator lights up when the compressor is working.
In some models LG a specific malfunction occurs when The engine bushing dries out and the shaft begins to play. This leads to the impeller beating against the casing body. If you find such a defect, simple lubrication will help only temporarily. Replacing the sleeve bearing or the entire assembly is the only reliable solution to restore quiet operation.
⚠️ Attention: Do not try to lubricate a motor running under voltage with oil from an aerosol can. This may lead to ignition of oil vapors or damage to the motor winding.
Necessary tools and preparation
To perform dismantling efficiently, you will need a minimum set of home craftsman. The main requirement is that the tools should not damage the plastic latches and decorative surfaces. Using brute force when unscrewing screws or snapping off panels is unacceptable.
You will need a medium-sized Phillips screwdriver, as the screws in refrigerators LG are usually standard. A flat spatula or plastic spatula for opening the clips would also be useful. If you plan to check the electrical circuit, prepare a multimeter to test the motor windings for a break.
☑️ Preparation for repair
Prepare a place to work in advance. You will need space in front of the refrigerator to fully pull out the drawers and remove the back panel. It is also recommended to cover the floor with cardboard or a rag, since when defrosting the evaporator (if necessary), water may get on the floor.
Procedure for disassembling the freezer compartment
Access to the fan in system refrigerators No Frost is always hidden behind the rear panel of the freezer compartment. The disassembly process may vary depending on the specific series, but the general algorithm remains similar. First you need to free the camera from foreign objects.
Remove all removable shelves, baskets and containers. On some models, the bottom drawer may interfere with access to the bottom panel screws and must also be removed. Be careful with plastic guides, they can be brittle at low temperatures.
| Element | Mounting type | Location | Tool |
|---|---|---|---|
| Top panel | Screws + latches | Camera ceiling | Phillips screwdriver |
| Rear wall | Screws around the perimeter | Chamber depth | Phillips screwdriver |
| Fan casing | Plastic clips | Behind the evaporator | Flat blade |
| Motor mounting | Screws or clamps | Inside the casing | Small screwdriver |
After freeing the space, inspect the perimeter of the rear wall. The screws can be hidden under decorative plugs or plastic covers. Gently pry them out with a flat tool. Having unscrewed all visible fasteners, you need to pull the panel towards you, starting from the bottom, to remove the upper hooks from the grooves.
Dismantling and removing the fan
After removing the main rear panel, the evaporator and air duct system will open to your view. The fan is usually located in a special compartment to the right or left of the radiator, covered with an additional plastic casing. This shroud is often secured with latches that require careful handling.
Use a plastic spudger to release the fan shroud clips. Do not use metal screwdrivers for these purposes, so as not to pierce the thin walls of the plastic channel or damage the aluminum evaporator tubes. After removing the cover, you will see the engine itself with the impeller.
Mounting nuances in different series
In some LG models of the GA-B or GC-B series, the fan can be attached not directly to the body, but through rubber vibration dampers. When removing, it is important not to lose these damper bushings, since without them the noise level after assembly will increase significantly.
To remove the unit, you must disconnect the electrical connector. It may have a locking tab that must be bent before pulling out the plug. Then the screws holding the motor housing are unscrewed, or the plastic tabs are unclenched, if the design allows.
- 🔌 Disconnection: Carefully disconnect the wire plug, holding the connector body, and not the wires themselves.
- 🔩 Fasteners: Unscrew the screws holding the motor in the mounting place.
- 🌀 Impeller: If you are changing only the motor, the impeller must be moved to the new shaft, observing the orientation.
Often the impeller sits very tightly on the shaft. When replacing the engine it has to be removed. Do this carefully so as not to break the blades. If the plastic has frozen and become brittle (brittle), it is better to wait until the remaining ice has completely thawed.
Checking performance and replacing
The removed fan must be checked. A visual inspection may show cracks in the case or melting of the plastic, which indicates overheating. However, the main test is carried out with a multimeter in resistance measurement mode.
The normal resistance of the motor windings varies in the range from 200 to 600 Ohms, depending on the model and power. If the device shows one (open) or zero (short circuit), the part must be replaced. Also check the shaft for play - it should rotate freely, but with little resistance.
When installing a new part, make sure that its characteristics (voltage, dimensions, direction of rotation) match the original. For refrigerators LG motors with markings starting with 4681 or similar are often used. Installation is carried out in the reverse order of removal.
⚠️ Attention: Technical characteristics of fans may vary depending on the year of manufacture of the refrigerator. Always check the part number (Part Number) on the label of the old motor with the new one before purchasing.
Assembling and testing the system
The final stage is assembly. Place the fan in place, connect the connector until you hear a characteristic click. Make sure that the wires do not get under rotating parts or are pinched by the housing. Secure the protective casing and the main camera panel.
It is important to install the panel correctly: first insert the upper hooks into the grooves, then press the bottom firmly until the latches click. Tighten all screws. Replace drawers and shelves. Only after complete mechanical assembly can you plug in the refrigerator.
After turning on, evaluate the operation of the system. Cold air should begin to circulate immediately. During the first hours of operation, the refrigerator will gain temperature, so do not load it with food right away. Allow the system to return to mode.
Is it possible to lubricate an old fan instead of replacing it?
Only the sleeve bearing can be lubricated by dropping a drop of machine oil onto the shaft. However, if the bushing has already worn out and play has appeared, lubricant will only give a temporary effect for a couple of weeks. In most cases, a complete replacement of the unit is required.
Why does the fan stop when the door is opened?
This is a standard function implemented through a limit switch (door opening sensor). It is needed to save energy and prevent cold air from being blown out. If the fan does not stop, the sensor is faulty.
How often do you need to defrost a No Frost refrigerator?
The No Frost system does not require regular defrosting by the user, since defrosting occurs automatically. However, once every 1-2 years, complete defrosting is recommended for hygiene and checking the drainage holes for blockages.
Where can I find the spare part number for my LG refrigerator?
The Part Number is usually written on a sticker glued to the housing of the fan motor itself. Information can also be found in the service manuals for the refrigerator model, indicating its full index.