The situation when a refrigerator LG begins to make extraneous sounds often takes owners by surprise. Just yesterday the unit worked quietly, but today it taps rhythmically or makes sharp metallic clicks. Noise in the refrigerator is not just discomfort, it is a signal that there are changes in the system that require attention.
Before calling a technician or panicking, it is necessary to conduct an initial diagnosis. Often the reason lies in trivial things, such as incorrect installation or operating mode, and not in a serious breakdown. In this article we will analyze all the possible reasons why LG refrigerator is knockingand provide step-by-step instructions for troubleshooting.
It is important to understand that modern models No Frost and Total No Frost have complex air circulation and automatic defrosting system, which may be accompanied by specific sounds. However, if the knocking becomes intrusive or loud, it cannot be ignored.
Natural sounds of the No Frost system
Many users mistake normal operating noises for a malfunction. If your the LG refrigerator hums and knocks periodically, perhaps we are talking about the normal operation of the system. In models with technology No Frost the fan drives cold air through the chambers, and its blades can touch frozen ice if micro-defrosting has occurred.
It is also worth considering the operation of the compressor. Inverter models, which are often found in line LG, can make characteristic clicks when starting or stopping the engine. This is due to switching operating modes and is not a defect. Sounds may resemble fluid flowing or a dull knock.
- 🔹 Clicking sounds when turning the compressor on and off are normal for the relay.
- 🔹 Fan noise - may increase if ice has formed on the blades.
- 🔹 Sound bubbling of the refrigerant - freon moves through the tubes, creating the sounds of overflow.
⚠️ Attention: If knocking is accompanied by a complete absence of cold or constant operation of the motor without stopping, this is a sign of a serious malfunction that requires professional diagnostics.
How to distinguish normal noise from a breakdown?
Normal noise is usually cyclical and does not change over time. Emergency knocking often increases, changes tone, or is accompanied by vibration of the housing, which can be felt by placing your palm against the wall of the unit.
Installation problems and vibration of the housing
One of the most common reasons why LG refrigerator is cracking or rattling is incorrect installation. The unit must stand strictly horizontally and vertically. If the legs are not adjusted, the body warps, which leads to distortion of the compressor and increased vibration.
Check the distance to the walls. For normal air circulation and the absence of resonant sounds, the back wall of the refrigerator should be at least 5-7 centimeters away from the wall. If the gap is smaller, the vibration is transmitted to the wall, increasing the noise.
Also inspect the area around it. Often small objects get inside the ventilation grilles or under the bottom, which begin to rattle from the operation of the motor. Make sure that there are no heavy vases or jars on the top panel that could resonate.
☑️ Installation diagnostics
To adjust the legs, you may need a key or just manual effort, depending on the model. Turn the adjustment screws clockwise to raise the angle, or counterclockwise to lower it. After each turn, check the stability.
Malfunctions of the compressor and start relay
If LG refrigerator knocks loudly it is in the lower rear part where the motor is located, the problem may be in the compressor. This is the “heart” of the unit, and its malfunctions are the most critical. A knocking noise may occur due to wear of internal parts, broken bearings, or loosening of mounting bolts.
The start relay deserves special attention. If it fails, the compressor may try to start, make a loud clicking noise, and then shut down. This cycle can be repeated many times. In such cases, a distinct metallic clang is heard.
| Sound type | Probable cause | Urgency of repair |
|---|---|---|
| Loud metallic clang | Destruction of the suspension compressor | High |
| Frequent clicks without starting | Malfunction of the starting relay | Medium |
| Hum with vibration | Wear motor bearings | High |
| Rhythmic humming | Normal (inverter operation) | Not required |
In some cases, the cause of the knocking is the compressor suspension itself. The springs that hold the motor can stretch or break, causing the metal body of the motor to bang against the frame when starting. This creates a very loud and frightening knock.
Foreign objects and rattling of pipes
Often the answer to the question "why LG refrigerator knocks" lies in the little things. During operation or transportation, the copper condenser tubes located at the rear may become dislodged. During operation, the compressor vibrates, and if the tubes come into contact with each other or with the cabinet wall, a characteristic rattling sound occurs.
To fix this problem, you need to carefully move the refrigerator and inspect the rear grille. Find where the tubes meet and gently straighten them with your hands to ensure clearance. Be extremely careful: copper is soft, and it is very easy to damage the tube, which will lead to freon leakage.
- 🔹 Check the compressor fastenings - the bolts may become loose due to constant vibration.
- 🔹 Inspect the water collection tray above the compressor - it may rattle.
- 🔹 Make sure that nothing inside the cameras has fallen behind the back wall.
⚠️ Attention: When working with the back panel and tubes, it is strictly prohibited to use sharp tools. Any damage to the cooling circuit will require expensive repairs with sealing and recharging of refrigerant.
Noises in the freezer and fan
If LG refrigerator clicks or noise is in the area of the freezer, the likely culprit is the fan systems No Frost. Over time, the fan bearings wear out and the fan begins to hum or make a grinding noise. In addition, ice can accumulate on the blades, which interferes with rotation.
Sometimes the ice freezes so much that the fan simply cannot turn, and you can only hear the motor trying to start, accompanied by a crackling sound. In such cases, complete defrosting of the refrigerator is required. Disconnect the unit from the mains, open the doors and leave for at least 24 hours.
After defrosting, turn on the refrigerator. If the noise disappeared for several days and then returned, it means that the melt water drainage system is broken or the defrosting heating element is faulty. Ice will accumulate again and begin to interfere with the operation of the fan.
Inverter compressor: sound features
Owners of modern models LG s inverter compressor they often notice that their equipment makes sounds that are unusual for old refrigerators. The inverter does not operate jerkily (turned on and off), but smoothly changes power. This may be accompanied by a hum or periodic clicking when changing modes.
Such sounds are usually quiet and should not cause concern. However, if the inverter refrigerator begins to make sharp, loud knocking noises, this may indicate a problem with the electronic control unit, which is incorrectly sending signals to the motor.
It is important to note that inverter systems are more sensitive to voltage changes in the network. Unstable power supply can cause malfunctions, which manifest themselves in the form of unusual sound signals or chaotic switching on.
⚠️ Attention: Technical characteristics and operating algorithms of inverter compressors may vary depending on the specific series and year of manufacture. If your model was released recently, check the official documentation LG to clarify acceptable noise levels.
FAQ: Frequently asked questions
Why does the new LG refrigerator knock when first turned on?
When first started, the compressor runs at maximum power to quickly cool the chambers. This may cause more hum and vibration. It is also possible for the housing materials to expand when the temperature changes, which gives sound effects.
Is it possible to replace the start relay yourself?
Yes, if you have electrical skills and an understanding of the refrigerator. The relay is removed from the compressor side. However, if you are not confident in your abilities, it is better to call a technician, since a mistake can lead to the burning of an expensive compressor.
The refrigerator knocks only at night, and is quieter during the day. Why?
Most likely, during the day, extraneous household noises mask the operation of the refrigerator. At night, in silence, the natural sounds of the compressor operating and freon flowing become audible. If the knocking is quiet and rhythmic, this is normal.
What to do if the knocking appears after defrosting?
If the knocking appears immediately after turning on after defrosting, perhaps you did not dry the unit well enough, and water got on the electrical contacts or in the tray. Let the refrigerator run for several hours until the water evaporates. If the sound is metallic and strong, check to see if ice has frozen to the fan.
Is a loud knock a sign of a freon leak?
A freon leak itself usually does not cause a knock. However, if a leak causes the compressor to run non-stop trying to get up to temperature, it may overheat and start making knocking noises due to wear and tear. In this case, knocking is a secondary symptom.