Why a new refrigerator makes a crackling sound: physics, design and possible problems

Have you just installed a shiny new refrigerator, but instead of the expected silence, you hear strange clicks, crackles, or even loud pops? Do not rush to panic - in 90% of cases this is a normal phenomenon due to physical processes and the design of modern models. However, in some situations, a cracking sound can signal imminent problems.

This article will help you figure out why a new refrigerator makes a cracking sound: from harmless plastic expansion to potential compressor or system malfunctions. No Frost. We will analyze each type of sound in detail, accompany the explanations with technical nuances and provide a checklist for self-diagnosis. And if the cracking sound is accompanied by other symptoms, you will find instructions on when to call a specialist.

1. Physical processes: why cracking is normal

The main reason for cracking in new refrigerators lies in thermal expansion of materials. When the device is turned on, internal and external parts heat or cool unevenly, resulting in microscopic deformations. This is especially noticeable in the first days of operation, when plastic and metal “get used” to operating temperatures.

Here are the elements that most often make sounds:

• 🔹 Case and shelves: Plastic contracts when cooled, and expands when heated. This is accompanied by clicks similar to the cracking of ice.
• 🔹 Refrigerant pipes: Metal tubes through which freon circulates may be slightly deformed when pressure changes.
• 🔹 Door seal: Rubber seal fits more tightly as the temperature drops, which is sometimes accompanied by short sounds.
• 🔹 Trays and containers: Glass or plastic elements may move slightly with temperature changes.

These sounds are usually intensifies in the first 1-2 weeks of operation of the refrigerator, then become less noticeable. If the cracking sound is not accompanied by other symptoms (for example, increased vibration or refrigerant leakage), there is nothing to worry about.

2. Compressor: the main “musician” of the refrigerator

The compressor is the heart of the refrigerator, and its work is rarely complete without sound effects. In new models (especially inverter ones), compressors can emit:

• 🔊 Clicks when starting and stopping (start relay is activated).
• 🔊 A hum with periodic crackling is a normal vibration transmitted to the housing.
• 🔊 Sharp pops (in models with Linear Compressor, for example, at LG or Samsung) - a feature of the operation of linear compressors.

If your the refrigerator is equipped with an inverter compressor (for example, Hitachi R-W390PUC6 or Bosch KAN92VI30R), it will work almost continuously, but with variable power. This can create the illusion of a "constant crackling" when in fact you are hearing a smooth change in pitch of the hum.

⚠️ Attention: If the compressor makes a metallic grinding or knock (as if something is beating inside), this may indicate a bearing failure or piston jamming. In this case, immediately disconnect the refrigerator from the network and call a technician.

3. No Frost system: why it cracks and bursts

Refrigerators with the system No Frost (for example, Indesit ITS 5180 W or ATLANT XM 6025-031) have an additional source of noise - fan and defrost heater. Here's what can cause the crackling:

• ❄️ Ice in the air ducts: During automatic defrosting, pieces of ice can break off and fall to the bottom of the chamber with a characteristic sound.
• 🌀 Fan: The blades may touch ice or touch the body when the temperature changes.
• 🔥 Defrost heater: When turned on and off, it makes clicking sounds (similar to an electric kettle).

In models with Total No Frost (for example, Liebherr CNef 4315) the crackling noise may be louder due to the larger number of air ducts. If the sounds remind you of crunch of snow underfoot that's normal. But if you hear constant blows (as if something is beating against the walls), the fan may be broken or the blades are icy.

4. Nuances of new models: inverters, linear compressors and smart functions

Modern refrigerators are equipped with technologies that can amplify or modify familiar sounds. Let's consider the key features:

Inverter compressors (installed in Samsung RB30A3200SA, LG GA-B409SQDL etc.) operate without sudden starts, but can produce:

• 📉 Smooth change in hum tone (from low to high and back).
• 🔄 Clicks when changing power (speed adjustment).

Linear compressors (for example, in LG DoorCooling+) are characterized by increased accuracy of temperature maintenance, but can:

• 💥 Produce sharp pops when the valves are activated.
• 🔊 Produce a high-frequency squeak (especially in the first hours after switching on).

Smart refrigerators (for example Samsung Family Hub) have additional modules (Wi-Fi, displays) that can:

• 📶 Crackling during transmission data (if a 4G module is built-in).
• 🔋 Click when charging the display battery (in models with a stand-alone screen).

⚠️ Attention: If your refrigerator is equipped with the function Eco Mode or Holiday Mode, when these modes are activated, the compressor may work outside the box, resulting in unusual sounds. Check the settings in the menu (usually the path: Settings → Energy → Eco Mode).

What is a linear compressor and why is it noisy?

Linear compressors (for example, in LG refrigerators) use a magnetic drive instead of a traditional piston mechanism. This allows you to precisely regulate the power, but leads to sudden switching of the magnetic field - hence the popping noise. Over time, the sounds become quieter as the parts “grind in.”

5. When a crackling sound is a sign of a malfunction: 4 alarming symptoms

Crackling is not always harmless. Pay attention to these signs that may indicate a breakdown:

1. The cracking is accompanied by vibration of the body

If the refrigerator is not just cracking, but trembling or “bouncing”the problem may be:

• 🔧 Unbalanced compressor (adjustment of shock absorbers is required).
• 🛠️ Loose tube fastenings (they can hit the housing).

2. Constant crackling sound without pauses

If the sounds do not stop for a minute, this may mean:

• ❄️ Fan icing (in models with No Frost).
• ⚡ Short short circuit in the electrical circuit (dangerous!).

3. Cracking + increase in temperature in the chamber

If the refrigerator does not freeze well and is cracking, the following are possible:

• 🧊 Freon leakage (the compressor is wearing out).
• 🔌 Thermostat malfunction (the compressor does not turn off).

4. Metallic grinding or knocking

Such a sound may indicate:

• 🔩 Failure of the compressor bearing (requires urgent replacement).
• 🛑 Fan jamming (you need to defrost and check the blades).

Check whether the refrigerator is touching the furniture or walls|

Disable the fast freezing function (if enabled)|

Listen to see if the nature of the cracking noise changes when the door is open|

Check the temperature in the chambers (must match the settings)|

Inspect the seal for ice or damage-->

6 How to reduce cracking: practical. tips

If the cracking sound is not related to a malfunction, but is disturbing, try these methods:

1. Level the refrigerator

An uneven installation increases vibration. Use a level and adjust the legs so that the appliance stands stable. data-i="200">or ATLANT MHM 2835-90 or Beko GNE114620X usually there is a section Installation and alignment with step-by-step recommendations.

2 Check. gaps

The refrigerator should not touch walls, furniture or appliances. Minimum gaps:

• 🔳 Rear: 5–10 cm (for compressor ventilation).
• 🔳 On the sides: 2–3 cm (to prevent transmission vibration).
• 🔳 Top: 10–15 cm (if a model with top ventilation).

3. Defrost the refrigerator

If the cracking noise comes from the freezer chambers, try defrosting the device for 10–12 hours. This will help eliminate ice, which can be a source of sounds. In models with No Frost defrosting is required less often, but it is still recommended to do it 1-2 times a year.

4. Check the contents of the chambers

Sometimes the cracking is caused by:

• 🥤 Glass jarstouching each other.
• 🧊 Ice in trays, which can crack when the door is opened.
• 📦 Plastic containers, deformed when cooled.

5. Adjust the temperature

Excessively low temperature increases thermal stress. Optimal settings:

• 🌡️ Refrigerator compartment: +4…+5°C.
• ❄️ Freezer compartment: –18°C (not lower if not needed) quick freezing).

7. repair

If self-diagnosis does not help, and the cracking noise is accompanied by other symptoms, it’s time to contact a specialist. Here are the estimated prices for repairs (may vary depending on the region and model):

Before the technician’s visit:

1. Unplug the refrigerator.
2. Thaw it (if it is safe).
3. Prepare documents (warranty card, receipt).
4. Record the nature of the sounds (when they occur, how long they last).

⚠️ Attention: If the refrigerator is under warranty, do not disassemble it yourself this may lead to failure for free repair. Contact the brand's authorized service center (contacts are usually listed in the instructions or on the manufacturer's website).

FAQ: Frequently asked questions about cod in the refrigerator

The crackling intensifies at night - is this normal?

Yes, at night the refrigerator may crack louder due to the silence in the room. Also at night the temperature in the room is usually lower, which leads to more intense compression of the plastic. If during the day the sounds are almost inaudible, there is nothing to worry about.

The new refrigerator is cracking and smells like plastic - what to do?

The smell of new plastic and cracking in the first days of operation are normal. To eliminate the smell, wipe the internal surfaces with a solution of water and vinegar (1:1) and ventilate the refrigerator for 2-3 hours with the door open.

Is it possible to repair the compressor yourself if it is cracking?

No, compressor repair requires special skills and equipment (vacuum pump, pressure gauges, gas torch for soldering). Attempts on your own may lead to freon leakage or permanent failure. The best thing you can do is check the fastenings and shock absorbers.

Crackling appeared after a power outage - what is it?

After a sudden power outage, the compressor may make unusual sounds when restarted. This is due to a change in pressure in the system. Let the refrigerator run for 1-2 hours - if the cracking does not disappear, check the voltage in the network (it may be unstable).

How to distinguish a normal crackling sound from a breakdown?

Normal crackling:

• Short and irregular.
• Not accompanied by vibration or temperature change.
• Becomes quieter over time.

Alarming crackling:

• Constant, without pauses.
• Accompanied by knocking, grinding or overheating of the case.
• The refrigerator does not freeze well.