The appearance of extraneous sounds in kitchen appliances is always a cause for concern, especially when it comes to refrigeration equipment. When you notice that your unit makes characteristic cracking, clicking or humming sounds, this signals processes occurring within the system. For owners of brand equipment Indesit it is important to understand that not every sound is a sign of a breakdown.
In some cases, crackling is a completely normal reaction of materials to temperature changes or the operation of certain components. However, sudden changes in the acoustic background should not be ignored. Understanding the nature of sound will help you make the right decision: call a specialist or you can solve the problem yourself.
In this article we will analyze in detail the mechanical and physical causes of noise. You will learn how to distinguish normal operation from a critical malfunction, and what steps to take to diagnose your device.
Natural physical processes: expansion and contraction
The most common reason why a cracking noise is heard inside the chamber is thermal deformation of materials. The refrigerator walls, shelves and internal elements are made of plastic and metal, which have different coefficients of thermal expansion. When the compressor suddenly turns on or, conversely, when it stops, the temperature of the walls changes, causing characteristic sounds.
If you hear periodic crackling sounds reminiscent of a hot kettle cooling down, most likely there is nothing to worry about. This phenomenon is especially typical for new models or after defrosting. Thermoregulator can give commands to turn on, triggering a chain reaction of expansion of parts.
⚠️ Attention: If the crackling sound is accompanied by a burning smell or smoke, immediately unplug the device. This may indicate overheating of the wiring or melting of the insulation.
Often users confuse these sounds with a breakdown, although in fact the housing is adapting. The rear wall, where the evaporator is located, can “shoot” especially loudly. Over time, when the device gets used to operating cycles, the intensity of the sounds may decrease.
Operation of the defrost system and compressor
The second most common source of noise is the operation of the system defrosting. Modern models Indesit No Frost i Indesit Total No Frost use automatic defrosting of the evaporator. The heating element of the heating element is turned on by a timer, and the ice crust begins to melt, which may be accompanied by hissing and crackling.
The compressor also contributes to the acoustic background. When the engine starts, a pressure surge occurs in the system, and the refrigerant begins to circulate through the pipes. If you hear a gurgling sound that turns into a crackling noise, this may mean that freon is passing through narrow sections of the capillary tube.
- 🔊 Clicking sounds when starting - the start relay is working.
- ❄️ Cracking noise during idle time - evaporator defrosting.
- 💨 Hissing is the movement of freon through the system.
- ⚙️ Hum is the vibration of a running motor.
It is important to monitor the frequency of these sounds. If a crash is heard exactly at the moment when the motor stops or just begins to hum, this is a normal situation. Start relay Often it makes a loud click, closing the power circuit of the motor windings.
How to distinguish compressor noise from fan noise?
The compressor emits a low-frequency hum and vibration that is felt by the housing. The fan (in No Frost systems) makes a monotonous whistle or wind noise. The crackling sound most often refers to plastic or relays.
Mechanical faults and wear of parts
The situation becomes more serious if the crackling takes on a metallic tint or becomes a constant companion to the operation of the unit. In this case, a mechanical problem is likely. Wear of parts is a natural process that is accelerated by unstable voltage in the network or improper operation.
One of the common reasons is the failure of the start-up relay. If the contacts inside the relay burn out or stick, the compressor may not start the first time. You hear a series of clicks, followed by a hum and another click. This means that the engine is trying to start, but the protection turns it off.
Another reason is the destruction of the internal parts of the compressor. If the piston group is worn out, the engine will operate with strong vibration and metallic knocking. In such cases refrigeration unit requires replacement, since compressor repair is not economically feasible.
| Sound type | Probable cause | Need for repair |
|---|---|---|
| Rare quiet crackling | Thermal expansion | Not required |
| Loud clicks at start | Relay malfunction | Replacement relay |
| Metal knocking | Compressor wear | Motor replacement |
| Fan cracking | Ice freezing on the blades | Defrosting/replacement |
Problems with the fan in No Frost systems
If your Indesit equipped with a system No Frost, the source of the noise may be the fan circulating cold air. Over time, ice can build up on the fan blades or axis. This happens if the door seal is broken or the defrost sensor is faulty.
When the ice crust becomes too thick, the blades begin to touch the frozen layer. This causes a rhythmic crackling or humming noise, which intensifies when the door is opened (since in many models the fan should stop when the door is opened, but if it continues to make noise, this is a sign of a faulty sensor).
To diagnose this problem, it is often enough to completely defrost the refrigerator. Leave doors open for at least 24 hours. If, after turning on, the cracking noise disappears and appears again after a week or two, then the problem lies in the defrosting system (heating element, timer or sensor).
☑️ Fan diagnostics
Incorrect installation and external factors
Sometimes the reason lies not inside, but outside. Incorrect installation of the refrigerator leads to misalignment of the case, which causes vibration and contact of the tubes with the case or with each other. When the compressor operates, this vibration is transmitted to all elements, causing rattling.
Check whether the unit is level. Use a building level or just rock the refrigerator. If it wobbles, you need to tighten the adjustable supports. Also make sure that the refrigerator does not touch a wall or furniture, as vibration can be transmitted to them, creating a resonating sound.
Another factor is proximity to a heat source. If Indesit stands next to a stove or radiator, the cooling system operates in a stronger mode, which can lead to louder compressor sounds and expansion of materials.
⚠️ Attention: Do not install the refrigerator close to the wall. A minimum gap of 5-10 cm is necessary for free air circulation around the condenser.
When you need to call a specialist
There are a number of signs indicating that you will not be able to cope on your own. If the crackling sound is accompanied by a lack of cold, this indicates a freon leak or a blockage in the capillary system. In this case, the compressor may work non-stop, trying to gain temperature.
If you observe a series of frequent clicks followed by silence, and the refrigerator does not turn on, this is a clear sign of a malfunction of the start relay or the compressor itself. Operation in this mode can lead to complete combustion of the engine.
It is also worth contacting a specialist if the crackling noise appears after a power surge. The electronics may have been damaged and control module now incorrectly controls the defrosting systems or compressor.
Prevention and care of Indesit equipment
To extend the life of your refrigerator and minimize noise, it is important to follow the operating rules. Check the condition of the rubber seals regularly. If they are dirty or damaged, warm, moist air enters the chamber, which leads to increased ice formation and stress on the system.
Do not overload the shelves or place hot foods inside. A sudden change in temperature forces the compressor to work at its limit, and the plastic of the chambers is stressed, which causes a cracking sound. It is also important to periodically defrost the equipment, even if you have a No Frost system (at least once a year for hygienic cleaning).
Keep the condenser on the back wall clean. Dust and animal hair impair heat transfer, causing the engine to run longer and louder. Carefully vacuum the radiator grille to ensure normal cooling.
Frequently asked questions (FAQ)
Why does the Indesit refrigerator only crackle at night?
At night, the overall noise level in the apartment decreases, and you begin to notice sounds that were during the day invisible. In addition, at night the voltage in the network may stabilize or, conversely, jump, which affects the operation of the compressor. If the crackling is rhythmic and associated with switching cycles, this is normal.
Is it dangerous if a new refrigerator is cracking?
In most cases, this is normal for new equipment. The process of “grinding in” of parts and thermal expansion of materials takes place. However, if the sound is very loud, metallic or accompanied by vibration, it is worth checking the correct installation and transportation bolts.
Can the refrigerator be used if it is cracking?
If the cracking is caused by thermal expansion or the operation of the relay (rare clicks), it can be used. If the sound is constant, loud, metallic, or the refrigerator has stopped freezing, use may lead to compressor failure or fire.
How much does it cost to replace the start relay?
The cost consists of the price of the part and the work of the technician. The relay itself is inexpensive, but diagnostics and a specialist visit can make up the bulk of the cost. It is better to check the exact price at the service centers in your region.