The situation when the refrigerator suddenly begins to hum strongly Indesitis familiar to many owners of this equipment. Constant low-frequency hum, vibration or sharp knocks can be annoying, especially if the unit is installed in the kitchen-living room. Users often get scared, assuming that an expensive compressor has failed and the entire unit needs to be replaced.
However, there is no need to panic ahead of time. In most cases, unusual sounds indicate problems with auxiliary systems, installation problems, or the need for scheduled maintenance. Correct diagnosis allows you to identify the source of the sound without calling a technician.
In this article we will analyze the main reasons why a household refrigerator of the Indesit brand is humming, and we will describe step by step methods for solving the problem. You will learn to distinguish normal operating noise from signs of a serious breakdown that requires specialist intervention.
Primary diagnosis: normal or breakdown?
Before disassembling the unit, you need to understand the nature of the sound. Modern models Indesit No Frost and systems Total No Frost work quieter than older analogues, but they cannot be completely silent. A smooth, monotonous hum is considered normal, which appears when it is turned on motor-compressor and subsides when it stops.
The alarm should be sounded if the nature of the noise has changed. Rattling, whistling, gurgling, or metallic clanging sounds indicate mechanical problems. It is also important to monitor the cycle: if the refrigerator hums constantly without turning off, this may indicate a loss of refrigerant or a malfunction of the thermostat.
⚠️ Attention: If the smell of burning or melted wiring is added to the hum, immediately disconnect the appliance from the power supply and call a technician. It is dangerous to operate such equipment.
To accurately determine the sound source, try placing your hand on different parts of the body. Vibration can be localized in the lower part where the motor is located, or in the upper part where the system fans are located No Frost. This will help narrow down the troubleshooting area.
Installation problems and external factors
One of the most common reasons why an Indesit refrigerator hums is a banal violation of installation rules. The unit must stand strictly horizontally. If the legs are twisted unevenly, the body warps, which leads to displacement of the internal components and the occurrence of resonant vibration.
The second important point is the distance to the walls and furniture. For normal air circulation and the absence of an acoustic “echo” effect, a gap of at least 5-10 cm is required on all sides. If the case touches a wall or cabinet, the vibration of the compressor is transmitted to the furniture, increasing the hum significantly.
Also check that the pipes condenser (black grille at the back) or other internal elements are not touching each other. During operation, they may vibrate and knock against each other. Gently move the pipes by hand (with the power off) to ensure clearance.
Faults in the compressor and start relay
If external factors are excluded, the likely cause lies in the heart of the refrigerator - the compressor. This unit creates the main pressure in the system. Over time, the engine bearings wear out, resulting in a characteristic howling or humming sound that intensifies as it warms up.
The noise is often the culprit. starting relay. This small element is responsible for starting the engine. If the relay contacts are oxidized or the mechanism is jammed, the refrigerator may hum, click, but not start, or operate with increased noise and vibration.
Old Indesit models used compressors with a crank pair, which by definition operate louder than modern piston or inverter analogs. If your refrigerator is more than 10-12 years old, an increase in hum may be a sign of natural wear and tear on the mechanical part of the motor.
⚠️ Attention: Replacing a compressor is a complex procedure that requires evacuation of the system and charging with freon. It is impossible to carry out this work efficiently on your own without special equipment.
You can diagnose a compressor breakdown by carefully touching its housing during operation. If it overheats (it is impossible to hold your hand) and at the same time hums strongly, but there is no cold, most likely a valve breakage or an inter-turn short circuit of the windings has occurred.
Noise in the No Frost system: fan and evaporator
In models with automatic defrosting (No Frost) for circulation The air is supplied by the fan. If you hear a whistling, crackling, or noise that sounds like a propeller, this is most likely the problem. The blades could have moved, or ice may have frozen on them, touching the housing.
Another common reason is ice freezing on the evaporator. If the melt water drainage system is clogged or the heating element is turned off, the ice coat grows and begins to interfere with the rotation of the fan. In this case, the refrigerator hums intermittently, often making a grinding noise.
How to check the fan?
To check, remove the back panel in the freezer compartment. Manually rotate the fan blades. If jamming is felt or a crunching sound is heard, the mechanism requires replacement or lubrication.
The solution is often to completely defrost the refrigerator. Unplug the appliance, open the doors and leave for at least 24 hours. This will allow the ice to melt and free the rotating parts. If after switching on the noise disappeared, it was a matter of freezing.
Vibration of internal elements and pipelines
The source of sound can be not only motors, but also freely hanging refrigerant pipes. When the compressor operates, they vibrate and may touch the cabinet walls or each other. This creates a loud metallic rattling sound, which is often confused with a motor failure.
Also check the shelves and containers inside the chambers. Glass shelves that are not secured in the grooves, or plastic drawers that are placed crookedly, can resonate from the vibration of the frame. Take out all the contents and listen to the operation of the unit in an empty state.
To eliminate rattling pipes, it is often enough to carefully, without applying excessive force, move them apart with your hands or place a piece of foam rubber at the point of contact. The main thing is not to pinch or damage the thin-walled tubes, as this will lead to freon leakage.
☑️ Diagnostics of internal noise
Table: Nature of noise and possible cause
For ease of diagnosis, we will collect the main types of sounds and their probable causes in a summary table. This will help you quickly navigate the situation.
| Sound type | Probable cause | Difficulty of repair |
|---|---|---|
| Smooth humming | Normal operation compressor | Not required |
| Gurgling, overflow | Movement of freon through the tubes (normal) | Not required |
| Whistling, crackling | Fan malfunction No Frost | Medium (replacement) |
| Metal clanging | Pipes touching or compressor failure | High |
| Clicking sounds when starting | Start relay malfunction | Low (relay replacement) |
Please note that gurgling sounds immediately after the compressor is turned off are absolutely normal. The refrigerant flows from a high-pressure zone to a low-pressure zone, which creates a characteristic sound.
Do-it-yourself methods for eliminating noise
If you determine that the problem is not a serious motor breakdown, fix the noise yourself. Start by checking the compressor mounting bolts. Over time, they may weaken, and the motor will begin to “walk” on the rubber shock absorbers, creating vibration.
Tighten the bolts, but do not overtighten them, so as not to strip the threads. If the rubber washers under the compressor become dry or cracked, they must be replaced. New shock absorbers will significantly reduce the level of noise and vibration of the case.
In the case of models Indesitwhere the compressor is often closed with a metal casing at the bottom, make sure that the casing itself is also securely fastened. Sometimes it is the metal cover that rattles, and not the unit itself.
When you need to call a technician
There are situations when self-repair is not only useless, but also dangerous. If, after defrosting and checking the fastenings, the refrigerator continues to hum, does not freeze, or works without stopping, professional diagnostics are required.
A specialist is needed to replace the compressor, eliminate freon leaks, replace thermostats and control modules. These works require tools, knowledge and consumables.
⚠️ Attention: Opening a sealed circuit (pipes) without a license and equipment is prohibited. An attempt at soldering yourself can lead to complete failure of the equipment.
You will also need a master if you are not confident in your abilities when disassembling components No Frost. Inept handling of plastic parts and heating elements can lead to their breakage.
Prevention and care of equipment
In order for the refrigerator Indesit to serve for a long time and quietly, it is important to follow the operating rules. Defrost regularly, at least once a year, even if the function is declared No Frost. This will help prevent ice from forming on hidden components.
Keep the back of the condenser grill clean. Dust and animal hair that stick to it impair heat transfer, causing the compressor to work harder and longer, which increases noise levels and energy consumption.
How to clean the condenser?
Use a soft brush or a vacuum cleaner with a narrow nozzle. Movements must be careful so as not to bend the thin fins of the radiator.
Do not place hot foods in the chamber. This puts extra stress on the cooling system, forcing the engine to work at its limit. Following simple rules will extend the life of your refrigerator.
Why does the Indesit refrigerator hum after defrosting?
If the hum intensifies after defrosting, perhaps you did not dry the unit enough before turning it on, and water got into the electrical contacts or onto the evaporator. The thermostat setting may also have gone wrong. Let the refrigerator run for several hours. If the noise does not subside, check to see if the drain has frozen again.
Can a humming compressor be lubricated?
No, the refrigerator compressor is a sealed unit. It has no holes for lubrication. Trying to drill a hole or lubricate the external moving parts (except the fan bearings) will not work and may damage the motor housing.
Is it normal for a new refrigerator to hum loudly?
New models may hum a little louder during the “break-in” period (the first 2-3 days). However, strong hum, vibration or knocking is not typical for new equipment. Check the shipping bolts (if they are on the compressor) and the correct installation.
How to reduce the noise of a refrigerator if it is in the kitchen?
Use anti-vibration pads under the feet. Make sure that the refrigerator is not placed close to a wall or furniture. If the pipe behind is noisy, you can carefully stick a piece of vibration-isolating material on the contact point.