The situation when Liebherr refrigerator begins to make unusual sounds always causes concern for the owner. German technology is famous for its reliability and quiet operation, so the appearance of a hum, squeak or knock is immediately noticeable. However, loud operation does not always indicate a serious breakdown of the unit.
Often, an increased noise level is associated with installation features or the first hours of operation after transportation. Understanding the difference between a normal operating hum and signs of trouble will help you make the right decision about calling a repairman. In this article we will analyze in detail all possible causes and ways to eliminate them.
Normal operating noise and adaptation after switching on
Immediately after switching on or defrosting Liebherr refrigerator may work more intensely than usual. This is a normal process of reaching a given temperature regime. During this period compressor operates at maximum speed to cool the chambers, which is inevitably accompanied by increased hum.
It is also worth considering the physics of the refrigerant. Gurgling, liquid pouring and quiet hissing is the sound of movement freon through the system tubes. In modern models with the NoFrost system, these sounds can be heard even in rest mode when air circulates. If the sound is monotonous and does not irritate the ear, there is nothing to worry about.
⚠️ Attention: If the refrigerator has just been brought from the store, it needs to stand upright for at least 2-4 hours before turning it on. Starting the compressor immediately after shaking can lead to water hammer and noisy oil operation.
It is important to distinguish the nature of the sound. The working hum should be uniform, without sudden changes in volume. If you hear metallic clangs or intermittent knocking, this is already beyond the norm. Typically, the adaptation period takes from 2 to 24 hours depending on the room temperature.
Installation problems and vibration of the case
One of the most common reasons why The Liebherr refrigerator is hummingis incorrect installation. Vibration from a running motor is transmitted to the body, and then to the floor and walls, increasing significantly. This creates a resonator effect, turning a quiet hum into an obsessive rumble.
The first thing you need to check is the horizontal installation. If the unit is not level, the load on compressor is distributed unevenly, which causes vibration. Also make sure that the equipment does not touch walls or furniture. The minimum gap should be 5-10 cm on all sides for free air circulation.
Check the adjusting supports. They should be pressed tightly to the floor. If the legs are twisted too much or, conversely, do not reach the surface, the body will rattle. Try to shake the refrigerator slightly - it should stand solidly.
☑️ Installation diagnostics
Fan malfunctions in the NoFrost system
In models with automatic defrosting, fanis responsible for the circulation of cold air. Over time, dust may accumulate in its mechanism, or the bearings may require lubrication. This results in a characteristic whistling, crackling or howling sound.
If you hear an unusual sound coming from the top of the freezer or from behind the back panel, most likely the problem is in the impeller. Sometimes ice freezes on the blades, and they begin to touch the walls of the casing, producing a loud crash. In such cases, defrosting or replacing the unit is required.
| Sound type | Probable cause | Necessary actions |
|---|---|---|
| Monotonous howling | Fan bearing wear | Replacing the fan |
| Intermittent crackling | Ice on the blades | Complete defrosting (24 hours) |
| Loud hum | Contamination dust | Cleaning the unit from dust |
| Knocking at startup | Hitting the wiring | Straighten the wires |
To diagnose this problem in some models Liebherr it is enough to open the door freezer. If the sound disappears, it means the fan has stopped (in many models it turns off when the door is open), and that is where the problem lies. If the hum remains, the source of the noise is elsewhere.
How to safely check the fan?
To visually inspect the fan, you need to remove the top cover of the freezer (in some models) or the back panel. Before doing this, be sure to unplug the refrigerator! Do not touch the blades with your fingers when the power is on.
Knock and rumble: problems with the compressor
The most unpleasant scenario is a malfunction of the very heart of the refrigerator. If compressor makes loud knocks, metal clanging or sharp clicks when trying to start, this indicates mechanical destruction of internal components or problems with the starting relay.
A frequent cause of knocking is wear of the shock absorbers on which it is suspended. motor-compressor. If the rubber washers dry out or burst, the metal housing of the motor begins to hit the metal frame of the refrigerator during operation. This can be easily fixed by replacing the shock absorbers, which is inexpensive.
⚠️ Attention: If the compressor hums, tries to start, clicks and turns off after a few seconds, do not try to turn it on again many times. This may indicate an interturn short circuit in the winding or a shaft wedge, which requires replacement of the unit.
It is also worth checking the start-up relay. If it is faulty, it may make a loud electrical noise. In older models, relays could be with an open coil; in new ones, compact plastic blocks are used. Their replacement is a standard repair procedure.
Foreign objects and rattling of parts
Sometimes the reason is trivial and lies inside the chambers. Glass shelves, bottles or containers may resonate due to vibration from the unit. Check that the food does not touch the back wall where the cold supply channels are located.
Pay special attention to the egg trays and shelves on the door. If they are not seated tightly, they will rattle when the engine is running. Try removing all the items from the refrigerator and listen. If there is silence, the problem has been found.
Another source of noise is the drip tray (bath) above the compressor at the back of the refrigerator. If it has moved or scale has formed on it, it may rattle due to vibration of the pipes. Also check if the tubes are hanging from the back of the unit.
When you need to call a technician
There are a number of symptoms in which independent repair is impossible or dangerous. If after defrosting, checking the level and removing foreign objects Liebherr refrigerator continues to make noise, professional diagnostics are required.
Call a specialist if:
- 🔴 The compressor runs continuously, gets very hot and buzzes loudly.
- 🔴 There is a smell of burning or burning plastic.
- 🔴 A whistle is heard, similar to a gas leak.
- 🔴 The refrigerator has stopped freezing, but the motor is trying to work.
Modern models Liebherr equipped with sophisticated electronics. An attempt to independently interfere with the control system or replace the compressor without special equipment (vacuum generator, pressure gauges) can lead to the final failure of the equipment.
Why did the refrigerator start making noise after defrosting?
If noise appears after defrosting, you may have been too hasty in turning it on. Water may have gotten into electrical parts or onto the fan. Ice in the condensate drainage system may also have shifted. Allow the unit to dry for at least 24 hours.
Is it normal for the refrigerator to gurgle after being turned off?
Yes, this is absolutely normal. After the compressor stops, the pressure in the system equalizes, and the refrigerant continues to flow through the tubes, making the sounds of overflowing liquid. This may last several minutes.
Can a new Liebherr refrigerator make noise?
In the first days of operation, a new refrigerator may make more noise than usual. The compressor parts are being grinded in and operating mode is being reached. If after a week the volume does not decrease, check the installation or contact the store.