The situation when the refrigerator begins to make unusual sounds is familiar to many owners of household appliances. Instead of the usual even hum, the device begins to rumble, knock or gurgle, causing concern for the safety of the products and the integrity of the unit. Extraneous noise is always a signal that the cooling system has malfunctioned or the operating conditions have been violated.
Before calling a technician, it is worth carrying out the initial diagnostics yourself. Often the reasons lie in trivial things: improper installation, vibration of the housing or temporary overload of the engine. However, loud sounds cannot be ignored, as they may indicate wear bearings, malfunction compressor or problems with the refrigerant.
In this article we will examine in detail the mechanics of noise occurrence, methods its localization and methods of elimination. You will learn when it is enough to simply tighten the legs, and in which cases serious repairs with replacement of components are required.
The nature of noise in refrigeration chambers
Any working mechanism produces vibration. In modern refrigerators, the noise level is strictly standardized, but over time it can increase. The main source of sound is compressor the heart of the refrigerator, which compresses the refrigerant. When starting the engine or when it stops, pressure surges occur, which can be accompanied by a characteristic click or hum.
In addition, the circulation of freon through the tubes is often accompanied by gurgling and gurgling. This is an absolutely normal process, especially in models with a system No Frostwhere a fan moves air throughout the chamber. But if rattling or metallic clanging is added to these sounds, it means that some structural element has lost stability or has failed.
It is important to distinguish between operating noise and emergency knock. The operating sound is monotonous and predictable. The emergency noise often changes in tone, becomes intermittent, or is accompanied by vibration of the housing, which can be felt by placing your hand against the wall.
Diagnostics: determining the source of the sound
The first step in solving the problem is to determine exactly where the sound is coming from. To do this, you need to go to the refrigerator and listen carefully. Often the source is not where we are looking for it. The noise can come from above, below, behind, or even from inside the chamber.
If the refrigerator is humming more than usual, check the gap between the back wall of the unit and the wall of the room. Too close a location disrupts air circulation, which forces condenser to work with overload, increasing noise. It is also worth checking whether the tubes are touching each other or the housing.
- 🔍 The hum comes from below - most likely the problem is in the compressor or its mounting.
- 🔍 Whistle or squeak - often indicates a fan malfunction or freon leak.
- 🔍 Gurgling inside is the normal operation of the refrigerant, but can signal airing of the system.
- 🔍 Rattling doors - wear of the seal or loosening of the hinges.
Pay attention to the nature of the sound in different operating modes. If the noise only appears when the door is opened, it is most likely the fan. If the rattling intensifies when the motor turns off, this may be a sign of a faulty start relay.
Installation problems and body vibration
The most common reason why a refrigerator cracks or rattles is improper installation. The unit must stand strictly horizontally. If the floor is uneven or the legs are twisted unevenly, the body warps, which leads to distortion of the internal mechanisms and increased vibration.
To fix the problem, you need to take a building level and check the position of the refrigerator. Adjustment is carried out using the front legs, which can be twisted or unscrewed. It is also important that the refrigerator does not touch walls, furniture or other objects.
⚠️ Attention: If the refrigerator is installed in a niche of a kitchen unit, make sure that there is a gap of at least 5-7 cm on all sides. Lack of ventilation leads to overheating and increased noise.
Also check the stability of the unit itself. A slight swing of the hand should not cause a knocking sound. If the legs slide on the floor, you can place rubber pads under them to dampen vibration.
☑️ Checking the installation of the refrigerator
Faults of the compressor and start relay
The compressor is the noisiest unit in the refrigerator. Over time, its parts wear out and the oil thickens, which leads to knocking and clanging. If you hear a loud metallic knock when starting the engine, this may indicate wear on the piston group or bearings.
Another common reason is a faulty start relay. This small element is responsible for starting the engine. If it fails, the compressor may try to start, make a click and stall again, which is accompanied by a characteristic crackling sound.
The table below shows the main symptoms of compressor group malfunctions:
| Symptom | Probable cause | Complexity repair |
|---|---|---|
| Loud knocking when starting | Wear of bearings or pistons | High (compressor replacement) |
| Clicks and buzzing without starting | Starter fault relay | Medium (relay replacement) |
| Constant strong hum | Overload or wear of the motor | High |
| Pipe vibration | Mounts are loose | Low (fixation) |
Diagnostics of the compressor requires caution. If you do not have the skills to work with electrical appliances, it is better not to disassemble the back panel yourself, since there are live parts there.
Fan and No Frost system
In refrigerators with a system No Frost a fan is responsible for circulating cold air. Over time, ice can build up on its blades, or dust can get into the bearings, causing humming and crackling noises. Often this sound intensifies when you open the door (in some models the fan should stop).
If the fan is noisy, you can try to lubricate it or clear it of ice. To do this, you will need to defrost the refrigerator completely (turn it off for 24 hours). If after defrosting the noise disappears, but returns after a couple of days, it means that the melt water drainage system is broken, and the water freezes again on the blades.
The noise may also be caused by a broken fan seat. In this case, it must be replaced with a new one. This is a relatively inexpensive part, and its replacement does not require calling a specialist with gas.
⚠️ Attention: Do not try to defrost ice on the fan with a hairdryer or knife. This can damage the plastic blades or damage the evaporator.
How to check the fan without disassembling?
Knock lightly on the back wall inside the chamber (where the fan usually stands). If the sound changes or temporarily disappears, that is where the problem lies.
When you need to call a technician
There are situations when self-repair not only will not help, but will also do harm. If you hear a hissing noise that doesn't stop, it could be a sign of a freon leak. In this case, the refrigerator will stop freezing, and the compressor will work without stopping, trying to gain temperature.
Also, the help of a specialist is needed if:
1. The compressor is hot to the touch and constantly hums.
2. There is a smell of burning or melted plastic.
3. The refrigerator knocks out the circuit breaker in the panel.
4. The internal backlight blinks or does not work.
A professional technician will conduct a full diagnosis using a pressure gauge and multimeter. It will determine the pressure in the system and the current consumed by the motor. Only on the basis of this data can you accurately say whether the unit can be repaired.
Why does the refrigerator hum loudly immediately after turning on?
Loud hum at first minutes of work is normal. The motor starts at maximum load to quickly cool the chamber. If after 10-15 minutes the sound subsides to a smooth hum, then the equipment is working properly.
Is it possible to lubricate a compressor if it crackles?
No, modern compressors are sealed and cannot be lubricated at home. An attempt to drill a hole or disassemble the housing will lead to instant failure and leakage of freon.
Does the amount of food affect the noise of the refrigerator?
Yes, an empty refrigerator can be noisier due to resonance inside the chamber. In addition, if food is placed close to the back wall, it can interfere with air circulation, causing the fan to work harder.
What to do if the refrigerator is on laminate and rattles?
Laminate is a hard coating that transmits vibration well. Be sure to use rubber anti-vibration footrests. Also check that the bottles and cans inside are not touching each other.
Is it normal for the refrigerator to make a clicking sound when it is turned off?
A single click when the compressor stops is normal. This is how the thermal relay is triggered or the pressure in the system is equalized. series of clicks is already a sign of a malfunction.