The situation when the refrigerator makes noise during operationcan unsettle any owner, especially if the equipment is in the kitchen-living room or studio apartment. A constant hum, periodic humming or sharp clicking not only creates discomfort, but can also indicate serious malfunctions of the compressor or defrosting system. These sounds cannot be ignored, as they are often the first symptoms of wear of parts or violation of operating rules.
In this article we will look in detail at why modern equipment makes extraneous sounds, how to distinguish normal operating noise from an alarm signal, and what steps need to be taken to ensure quiet operation of the unit. You will find out when it is enough to tighten the legs, and in what cases it is necessary replacement of the compressor or repair of the defrost system.
Natural sounds of refrigeration equipment
Before sounding the alarm, it is important to understand that absolutely silent refrigerators do not exist. The principle of operation compressors implies the movement of refrigerant through a system of tubes, which is inevitably accompanied by sound. A uniform hum is considered normal, which can intensify when the engine is turned on or immediately after it stops, when the pressure in the system equalizes. Modern models with inverter motors operate much quieter, but they also emit background noise.
Often users are frightened by gurgling sounds reminiscent of water pouring. This is the sound of circulation freon through the evaporator and condenser. Rare clicks that a thermostat or thermal relay makes when switching modes are also acceptable. If you have just loaded a lot of warm food into the chamber, the unit will work harder and, accordingly, louder until it reaches the set temperature.
⚠️ Attention: If you purchased a new refrigerator, let it sit after transportation for at least 4-8 hours before turning it on. The oil in the compressor must drain into the crankcase, otherwise the noise at first start-up will be significantly higher than normal.
It is important to distinguish the nature of the sound. A steady hum is normal. An intermittent knock, metal clinking or whistling is already a reason for diagnosis. Many brand models Indesit or Atlant may hum a little louder than their premium counterparts due to the design features of the motor, which is not a defect.
External factors: installation and ventilation
One of the most common reasons why the refrigerator makes a lot of noise, is an incorrect setting. If the body of the equipment touches walls, furniture or other objects, the vibration from the running motor is transmitted to them, increasing significantly. This creates a resonator effect. It is enough to move the unit a few centimeters for the noise level to drop to a comfortable level.
It is also critical to maintain clearances for ventilation. The compressor heats up during operation, and if the heat is not removed, the motor begins to overload, producing a strained hum. Check if the condenser (grid at the back) is clogged with dust and ensure free flow of air around the case.
Another important aspect is the horizontal installation. If the refrigerator is placed on an uneven floor, the cabinet vibrates. Use the front support feet to make adjustments. In most models they are unscrewed with a key or manually. Make sure that the equipment is stable and does not wobble when pressed lightly.
☑️ Checking the installation of the refrigerator
Mechanical causes of noise and vibration
If everything is in order with the installation, you should look for mechanical sources noise. Often vibration is transmitted to internal elements: shelves, drawers or bottles standing on the door. Try opening the door: if the noise disappears, it means that it is the door or the contents that are vibrating. Distribute the food so that they do not touch each other or the walls.
Compressor vibration can be transmitted to the cooling system pipes if they are located too close to each other or to the housing. In this case, the tubes may tap slightly. Independent straightening of the tubes is dangerous: the refrigerant is under pressure, and careless movement can lead to depressurization of the circuit. It is better to call a specialist for careful straightening.
Wear of fasteners also leads to rattling. Rubber gaskets under the compressor dry out over time and lose elasticity, no longer dampening engine vibration. Replacing these shock absorbers is a simple and inexpensive procedure that often solves the problem.
The table below shows the main mechanical causes and methods for eliminating them:
| Source of noise | Character of sound | Elimination method |
|---|---|---|
| Touching the furniture body | Increased hum, rattling | Move the refrigerator, remove the contact |
| Uneven floor | Vibration, humming | Adjusting the support legs |
| Tube contact | Metallic ringing, knocking | Bend the tubes (a master is required) |
| Wear of gaskets | Strong motor vibration | Replacing rubber shock absorbers |
Problems with the No Frost system and defrosting
In refrigerators with the system No Frost noise may be associated with the operation of the fan. It circulates cold air through the chambers. If ice is frozen on the fan blades or a foreign object gets on them, a characteristic cracking or humming sound will appear. This usually happens if the door seal is broken or the defrost heating element is faulty.
Completely defrosting the refrigerator (for 10-12 hours with the power turned off) often helps eliminate ice build-up on the fan. If after turning on the sound disappears, then the problem was in the ice. If the noise returns after a few days, it is necessary to check the defrost system: sensors, timer and heater.
Why does the fan make more noise in winter?
In the cold season, the temperature difference in the room and inside the chamber can lead to more active formation of condensation on the seals, which then freezes and enters the fan rotation zone. Regularly check the tightness of the door.
Also in No Frost models, noise can be made by the damper that regulates the air flow between the freezer and refrigerator compartments. If its mechanism jams, it may buzz or click. In such cases, lubrication of the mechanism or replacement of the unit is required.
Malfunctions of the compressor and start relay
The most serious and expensive cause of noise is a malfunction of the compressoritself. If the motor makes a loud metallic clang, knocking or hum that can be heard even in the next room, this indicates destruction of the internal motor mounts or wear of the piston group. In such cases, repair is often impractical; replacement of the compressor is required.
Another culprit is start relay. If it is faulty, the compressor may try to start, make a clicking noise, hum for a few seconds, and then turn off. After some time, the cycle repeats. This condition is dangerous for the motor windings and requires immediate intervention.
⚠️ Attention: Operating a refrigerator with a faulty start relay or a knocking compressor can lead to complete failure of the electric motor and a fire hazard.
It is better to entrust compressor diagnostics to a professional using pressure gauges and testers. Self-replacement requires skills in working with copper pipes, soldering and refrigerant charging.
When you need to call a specialist
Not all problems can be solved on your own. If you checked the installation, defrosted it, made sure the integrity of the internal elements, but the refrigerator continues to make noise, you need to call a specialist. Especially if the noise is accompanied by other symptoms: insufficient cooling, freezing of a “coat” of ice or frequent switching on and off.
The technician will conduct professional diagnostics, measure the noise level (the norm is usually up to 40 dB for modern models) and the pressure in the system. In some cases, it may be necessary to replace expensive components, and it is important to understand the economic feasibility of repairs.
Remember that a timely call to the service center can save the equipment from major repairs. Ignoring the first signs of a malfunction often leads to the fact that a simple replacement of a part turns into a complex and costly repair of the entire refrigeration system.
Frequently asked questions (FAQ)
Why does a new refrigerator hum loudly when it is first turned on?
When first started, the compressor works intensively to cool the empty chambers to the set temperature. This may take several hours. Also make sure that the shipping bolts (if any) have been removed and the refrigerator is level.
Is it normal for the refrigerator to gurgle after being turned off?
Yes, this is absolutely normal. After the compressor stops, the refrigerant continues to flow through the tubes from the high pressure zone to the low pressure zone, which is accompanied by the sounds of liquid pouring. This process can last up to 10-15 minutes.
Can an old refrigerator begin to make more noise?
Yes, over time, the rubber shock absorbers under the compressor wear out, the oil in the motor dries out, and the mounting of the tubes may also become loose. Regular maintenance and replacement of worn gaskets help reduce noise levels.
Does the amount of food in the refrigerator affect the noise level?
Indirectly - yes. An empty refrigerator may cycle more frequently, making the noise appear more frequent. In addition, loose objects inside may rattle due to vibration. A full refrigerator maintains its temperature better and the compressor turns on less often.
What to do if the refrigerator makes a whistle?
A whistle may indicate a freon leak or problems with the fan. In the first case, the system must be sealed and refilled; in the second, the fan must be cleaned or replaced. It is necessary to carry out diagnostics.