Why the refrigerator makes strange sounds (crackling, creaking, knocking) - we analyze all the reasons

Did your refrigerator suddenly start making suspicious sounds - crackling, squeaking, crackling or even loud clicks? Do not rush to panic: in 80% of cases this is not a breakdown, but normal operation of the components. But how to distinguish “healthy” noises from signals of a malfunction? In this article, we will analyze all possible causes - from harmless to critical - and also provide a checklist for self-diagnosis.

Modern refrigerators (even premium models like Liebherr CNef 4815 or Samsung RB37J5240SA) cannot operate absolutely silently. The compressor, fans, refrigerant circulation - all this creates background sounds. However, if the refrigerator begins crackling louder than usualto make rhythmic clicks or squeak when the door is opened, it is worth looking into the details. Especially if the sounds are accompanied by other symptoms: increased power consumption, poor cooling or frost on the walls.

We analyzed data from service centers and user reviews for 2023–2026 to create an up-to-date guide. In the article you will find:

• 🔍 Top 7 causes of crackling —from thermal expansion of plastic to compressor malfunction.
• 🛠️ Step-by-step instructions for diagnostics at home (without tools!).
• 📊 Comparison table "normal" and "dangerous" sounds.
• ⚠️ Warningswhen you urgently need to call a technician.

1. Thermal expansion of materials is the most common cause of cracking

If the refrigerator is cracking when turned on or off, the physical property of the materials is to blame - thermal expansion. Plastic panels, metal parts, and even door seals change size slightly with temperature changes. This is normal and does not require repair.

How to distinguish a “healthy” crackling from a breakdown?

• 🔹 Sounds appear in the first 10–30 minutes after switching on or with a sharp change in temperature room.
• 🔹 Cracking irregular, similar to the cracking of wood in a stove.
• 🔹 No other symptoms: the refrigerator is freezing normal, there is no puddle at the bottom, the door closes tightly.

This is especially noticeable in models with No Frost (for example, Bosch KGE39XW2AR or Indesit DF 5200 W), where fans and air ducts made of plastic actively react to changes. In older refrigerators (pre-2010), the cracking may be louder due to the thicker insulation layer.

⚠️ Attention: If the cracking is accompanied by burnt smell or smoke, immediately unplug the refrigerator! This may be a short circuit in the wiring or compressor.

2. Compressor operation: clicks, humming and vibration

The compressor is the “heart” of the refrigerator, and its operation is always accompanied by sounds. Normally, you can hear:

• 🔊 Clicking during startup (the start relay is activated).
• 🔊 Low frequency humming during operation (1-2 hours in a row).
• 🔊 Slight vibrationtransmitted to body.

But if the sounds become rhythmic (like a ticking clock) or are too loud, this may indicate:

• 🛑 Wear of bearings compressor (creaking or grinding noise).
• 🛑 Malfunction of the start relay (frequent clicks without starting the engine).
• 🛑 Increased refrigerant pressure (compressor runs without stopping + crackling noise in the pipes).

To check, press your ear to the back wall of the refrigerator (without touching it!). Normally, the compressor should uniform hummingwithout extraneous noise. If you hear metal knocks or grinding this is a reason to call a technician.

How to check a compressor without tools?

1. Unplug the refrigerator for 5 minutes.

2. Turn it on again and listen:

- Normal: one click (relay) → smooth hum.

- Failure: multiple clicks without starting or a loud knock.

3. If the compressor does not start at all, the winding may break or the relay may fail.

3. No Frost system fans: whistling and crackling

Refrigerators with the system No Frost (for example, LG GA-B489 YDQZ or ATLANT XM 4625-101) are equipped with fans for air circulation. These fans can emit:

• 💨 A slight whistle when the blades rotate.
• 💨 Crackling due to ice on the blades (if the defrosting system is working not ideal).
• 💨 Periodic clicks when turning the fan motor on/off.

If the sounds become constant or are accompanied deterioration of cooling, check:

1. If the food is blocking the ventilation holes in the freezer.
2. Is there ice on the back wall (a sign of a malfunctioning heater defrost).
3. Is the fan fastening loose (you can gently press the back wall with your hand - if the sound disappears, adjustment is needed).

⚠️ Attention: Never try to lubricate the fan with oil or WD-40! This can cause particles to get on food and damage the motor. For cleaning, use only a dry soft brush.

4. Refrigerant circulation: gurgling and hissing

Sounds similar to gurgling, hissing or transfusion of liquidare the normal movement of refrigerant (freon) through the circuit tubes. They may intensify:

• 🌡️ When you turn on the refrigerator for the first time.
• 🌡️ After defrosting.
• 🌡️ When changing the cooling mode (for example, when activating the function Super Freeze).

However, if the sounds become excessively loud or are accompanied by the following symptoms, this may indicate freon leak:

• 🚨 The refrigerator does not freeze well, but the compressor works non-stop.
• 🚨 Oily stains have appeared on the back wall (freon is mixed with the compressor oil).
• 🚨 The circuit tubes are covered frost unevenly.

Refrigerant leakage is one of the most dangerous malfunctions. Freon is toxic, and inhaling it can cause dizziness or nausea. If you suspect a leak, immediately ventilate the room and turn off the refrigerator.

5. Problems with the door: creaking, slamming, etc. clicks

If the refrigerator creaks when opening or closing the doorthe reason lies in the hinge mechanism or seal. Common problems:

For diagnostics:

1. Open the door and slowly close it, listening to the sounds.
2. Check whether there are gaps between the seal and the body (use a piece of paper - it should be pressed tightly).
3. Inspect the hinges for rust or play.

6. Ice and freezing: cracking sound when thawing

If the refrigerator is cracking like ice, most likely the problem is ice. This is typical for:

• ❄️ Models with drip system (for example, Biryusa 130), where frost forms on the back wall.
• ❄️ Refrigerators No Frost with a faulty defrost heater.
• ❄️ Appliances that have not been defrosted for a long time (ice thickness >5 mm).

How to fix:

1. Defrost the refrigerator for 12–24 hours (do not use a hairdryer or sharp objects!).
2. Check the operation of the defrost system (in models No Frost): after defrosting, listen - you should hear a slight crackling of the heater (every 8-12 hours).
3. If ice forms again after 1-2 weeks - the thermostat or heater is faulty.

⚠️ Attention: Never chip off the ice with a knife or fork! This can damage the evaporator and lead to a freon leak. To speed up defrosting, place a container of hot water (not boiling water!) in the chamber.

7. Foreign objects and mechanical damage

Sometimes the source of the crackling noise is foreign objectsthat got into the refrigerator mechanisms:

• 🧲 Metal covers from cans, attracted by the door magnet.
• 🍎 Pieces of foodthat are stuck in the ventilation holes.
• 🧊 Ice or plasticthat have gotten under the fan blades.
• 📦 Packagingtouching the back wall and vibrating from the operation of the compressor.

How to check:

1. Unplug the refrigerator.
2. Take out all the products and shelves, inspect the internal walls.
3. Check the space under the vegetable drawers - crumbs often accumulate there.
4. If the sound comes from behind, carefully move the refrigerator and inspect the compressor and pipes.

In models with water dispenser (for example, Samsung RF23J9011SG) the crackling noise can come from pumping station. Check to see if the water supply hose or filter is clogged.

FAQ: Frequently asked questions about refrigerator noises

❓ The refrigerator only rattles at night - why?

At night, the apartment is quieter, so ordinary sounds (thermal expansion, compressor operation) become more noticeable. Also at night automatic defrost in models No Frostit can be triggered, which is accompanied by a crackling noise from the heater. If there are no sounds during the day, this is normal.

❓ Is it possible to fix the compressor yourself if it is knocking?

No. The compressor is a sealed unit, and its repair requires special equipment (vacuum pump, freon filling station). If you suspect a compressor malfunction (knocking, grinding noise, lack of cooling), contact a service center. Self-repair can lead to freon leakage or short circuit.

❓ Why does a new refrigerator crack louder than the old one?

Modern models are thinner walls and plastic air ducts that react more actively to temperature changes. In addition, refrigerators No Frost have fans that create additional sounds. If the crackling sound is not accompanied by other problems (poor cooling, burning smell), this is normal.

❓ How to reduce the noise of the refrigerator?

Some tips:

• Install the refrigerator on a flat surface, adjust the legs.
• Do not place it close to the wall (a gap of at least 5 cm for air circulation).
• Check that the tubes do not touch the back wall of the furniture.
• Defrost the refrigerator every 6 months (even if it has No Frost).
• Do not overload the door with heavy foods (this upsets the balance).

❓ When do you need to urgently call a technician?

Contact service immediately if:

• Refrigerator does not cool, but the compressor is working.
• There was a burning smell or smoke.
• Audible metallic knocking from the compressor.
• On the back wall you can see oily stains (freon leak).
• The refrigerator beats electric shock when touched.

In these cases, independent repair is dangerous!