A sudden hum, periodic clicks or piercing whistles coming from a kitchen unit can unbalance any owner. When The refrigerator makes strange sounds, this is often the first signal that changes have occurred in the operation of the cooling system that require attention. Ignoring such acoustic anomalies can lead to more serious consequences, including compressor failure or food spoilage.
Do not panic ahead of time, since modern technology, especially models with with the No Frost systemhas a complex design, implying the presence of many moving elements. Many sounds are completely normal and indicate normal operation of the electronics or phase transitions of the refrigerant. However, the ability to distinguish operating noise from a harbinger of a breakdown is a skill that will save you money on calling a technician.
In this article we will analyze in detail the physics of the occurrence of various noises, draw the line between normal and pathological, and also provide a step-by-step algorithm of actions for self-diagnosis. You will learn to determine the source of the problem by the nature of the sound and understand in which cases repair is really necessary.
Physiology of noise: what sounds are considered normal
Before sounding the alarm, you need to understand that absolutely silent refrigerators do not exist in principle. Work compressor is always accompanied by vibration and hum, which is transmitted through the body and fastening elements. In modern models, the noise level is regulated by technical standards and usually does not exceed 40 dB, which is comparable to a quiet whisper.
Particular attention should be paid to units operating using technology No Frost. They are equipped with fans that force air to circulate inside the chambers. Periodic turning on and off of the fan, as well as a characteristic hum during its operation, is normal operation. In addition, the sound of dripping water or gurgling in the pipes indicates the movement of refrigerant or the removal of condensate, which is an integral part of the cooling cycle.
⚠️ Attention: If you have just installed a new refrigerator or moved it from another room, let it sit unplugged for several hours. The compressor oil must drain into the crankcase, otherwise the start-up will cause a strong hum and the risk of breakdown.
Rare clicks that the thermostat or protection relay makes when switching operating modes are also considered normal. These sounds can be quite loud, especially at night when the room is quiet. If the sound occurs once when the engine is turned on or off, and then there is silence, most likely the equipment is functioning properly.
- 🔊 Uniform low-frequency hum when the engine is running.
- 💧 Quiet gurgling or overflowing of liquid in the evaporator tubes.
- 🌀 Periodic fan noise (only for No Frost systems).
- 🔘 Single clicks of a relay or thermostat when changing cycles.
Understanding these nuances will help you not waste time calling a specialist to check working equipment. However, if the nature of the sound changes, a metallic clanging, grinding or continuous cracking appears, this is already a reason for a deeper diagnosis.
Diagnostics by sound type: determine the source of the problem
When The refrigerator is making strange sounds, their classification is the first step towards solving the problem. Experienced technicians can determine the malfunction simply by listening to the unit. Let's look at the main types of abnormal sounds and their probable causes.
If you hear a loud hum, which is accompanied by strong vibration of the case, the problem may lie in improper installation. An uneven floor or lack of clearance between the walls of the appliance and the furniture creates resonance, which increases the operating noise of the engine. In this case, it is enough to align the legs of the refrigerator and move it away from the wall.
A sharp metal grinding or clanging sound often indicates mechanical damage. This could be the fan blades touching ice or a foreign object falling into the engine operating area. Also, similar sounds are produced by a compressor in which the bearings are worn out or the internal piston elements are broken.
| Sound type | Probable cause | Danger level | Required actions |
|---|---|---|---|
| Shrill whistling | Freon leak or fan malfunction | High | Turn off and call a technician |
| Loud humming | Casing distortion or compressor wear | Average | Check the installation, measure the current |
| Plastic cracking | Thermal expansion of materials | Low | Observation, the norm for new models |
| Gurgling | Movement of refrigerant in the tubes | Normal | No action required |
Special attention is paid to the situation when the engine hums, but does not start, emitting only short buzzing impulses. This is a sign that the start relay is unable to start the engine, or the compressor is seized. In this case, operation must be stopped immediately to avoid burning out the windings.
Installation problems and external factors
Often the answer to the question is why The refrigerator makes strange noiseslies not in the breakdown of parts, but in the conditions of its operation. The technique is sensitive to the geometry of the installation. If the floor in the kitchen has a slope or bumps, the housing will warp, which leads to an imbalance in the motor rotor and increased vibration.
Use a building level to check the horizontal level. Adjustment is made using the front support legs, which usually have a threaded connection. By twisting or unscrewing them, you will achieve a stable position in which the unit will not wobble when pressed lightly.
⚠️ Attention: Make sure that the back panel of the refrigerator does not touch the wall or the sides of adjacent furniture. A minimum gap of 5-10 cm is necessary for free air circulation and to prevent vibration resonance.
Another external factor can be objects located on or inside the refrigerator itself. Heavy pots on the top lid can resonate with the vibration frequency of the compressor, creating an unpleasant rattling sound. Inside the chambers, the source of noise can be poorly secured shelves or glass bottles in contact with each other.
- 📏 Checking the horizontal installation with a building level.
- 🔧 Adjusting the height of the legs to eliminate distortion.
- 📦 Eliminating contact of the case with the furniture and walls.
- 🍽️ Checking the stability of objects inside and outside the chambers.
By eliminating these simple shortcomings, in most cases you can significantly reduce the noise level without using tools or calling specialists.
☑️ Diagnostics of refrigerator installation
Malfunctions of the No Frost system and fans
In refrigerators with a system No Frost the main source of extraneous sounds is often the fan. It is located in the freezer compartment (behind the back wall) or in the refrigerator compartment cooling unit. Over time, ice can build up on the blades, which leads to imbalance and the appearance of a hum or crackling sound.
If you hear a grinding noise that comes and goes, the fan motor bearing may be drying out and deteriorating. In this case, replacement of the unit is required. Also, the fan blades can touch the “coat” frozen on the evaporator if the defrosting system is not working correctly.
For diagnostics, you need to get to the fan. On most models, this will require removing the plastic panel in the freezer. A visual inspection will show the presence of ice on the blades or foreign objects (pieces of packaging, pieces of ice).
If the fan hums even after defrosting, most likely its electric motor has failed. Replacing this part does not require special skills or soldering, since they are usually connected via a connector.
How to safely defrost a fan?
Unplug the refrigerator for at least 12 hours (preferably for a day). Do not use a hairdryer or hot water to speed up the process - this may damage the plastic and electronic sensors. Natural defrosting is the safest method.
Failure of the compressor and start relay
The most serious and expensive problem is a malfunction compressor. This is the “heart” of the refrigerator, and if it starts to act up, the sounds will be appropriate. A humming sound that turns into a knock, or a loud metallic clanging indicates that the internal mechanisms of the compressor are worn out or destroyed.
Often, the starting relay fails along with the compressor. This is a small box placed over the motor contacts. If the relay is faulty, the compressor tries to start, hums for a few seconds, then clicks and goes silent. After some time, the cycle repeats.
In such a situation, operating the refrigerator is impossible and dangerous. Prolonged starting attempts can lead to overheating of the wiring and fire. It is necessary to replace the relay, and in the worst case, the compressor itself, which is a complex technical process that requires evacuation of the system and charging with freon.
⚠️ Attention: If the compressor runs continuously without turning off, and at the same time gets very hot (temperature above 90°C), this may indicate a refrigerant leak or loss of compression. Contact service immediately.
You can diagnose a loss of compressor performance by listening to the sound of operation: it becomes more strained, or, conversely, the motor is running “idle” with the characteristic sound of flowing gas without characteristic pressure.
When it is necessary to call a technician: critical signs
There are a number of symptoms in which self-repair is not only useless, but can also aggravate the situation. If the refrigerator makes strange sounds at the same time it stops freezing, or frost appears on food where it shouldn’t be, this is a complex problem.
A particularly alarming signal is a burning smell combined with unusual noise. This indicates overheating of the electrical contacts, melting of the insulation, or jamming of the motor. In this case, the device must be immediately de-energized.
Professional help is also necessary if opening the cooling circuit is required. Independent attempts to solder the tubes or add freon without special equipment are doomed to failure and can lead to complete failure of the unit.
- 🔥 The appearance of a burning or smoke smell.
- 🌡️ The compressor works non-stop and is very hot.
- 💧 Detection of oily spots under the refrigerator.
- ❄️ Complete absence of cold when the engine is running.
A timely call to a specialist will allow you to preserve equipment and avoid damage to products, the cost of which may exceed the cost of repairs.
Prevention and care of equipment
In order for your refrigerator to operate quietly and for a long time, you must follow simple operating rules. Regular defrosting (even for No Frost systems, a preventative shutdown once a year is recommended) will help avoid ice buildup on the fans and evaporator.
Keep the condenser grill on the rear wall clean. Dust and pet hair accumulate there and impair heat transfer, causing the compressor to work harder and noisier. The grille should be vacuumed every 6 months.
Do not overload the shelves and ensure that food does not touch the back wall of the chamber where the evaporator is located. This will prevent freezing and cracking during defrosting.
Following these simple recommendations will allow you to enjoy silence in the kitchen and be confident in the safety of your food.
Frequently asked questions (FAQ)
Why did the refrigerator start to hum more strongly after defrosting?
This may be due to the fact that the ice, which previously dampened the vibration, has melted, and now the real noise of the compressor can be heard. It is also possible that during defrosting, water got into the electrical contacts or onto the fan, causing a temporary imbalance. If the noise does not stop after a day of operation, check the motor mount.
Is it normal for the refrigerator to click when it is not working?
Yes, this is absolutely normal. Clicking sounds are produced by the metal of the case and internal elements during thermal expansion and contraction. The thermostat may also click, turning the compressor on and off even in standby mode (maintaining temperature).
Is it possible to lubricate the refrigerator fan if it squeaks?
In domestic conditions, it is extremely difficult to do this efficiently. Most fans have sealed bearings that are not designed for maintenance. Trying to lubricate them with oil can lead to damage to the plastic and spill of chemicals onto the food. It is better to replace the entire unit.
The refrigerator hums only at night, quieter during the day. Why?
At night, the general background noise in the house decreases, so the operation of equipment becomes more noticeable. In addition, the power supply often drops at night, which can cause a lower humming sound from the compressor. If the humming does not turn into knocking, this is normal.
What to do if the refrigerator constantly makes a "gurgling" sound?
Constant loud gurgling may indicate that there is little freon left in the system or, conversely, there is an excess of it after poor-quality repairs. This may also be a sign of a blockage in the capillary tube. A technician needs to diagnose the pressure in the system.