Why the refrigerator cracks after defrosting: 7 reasons and solutions

Have you finished defrosting the refrigerator, turned it back on - and suddenly heard a suspicious crackling, clicking or crackling sound? Do not rush to panic: in 80% of cases this is a normal physical phenomenon associated with the operation of the cooling system. However, in some situations, a cracking sound can signal hidden problems that require attention.

In this article we will analyze in detail all the possible causes of post-defrosting crackling noise - from the harmless sounds of plastic expansion to serious compressor or fan malfunctions. You will learn how to distinguish “normal” noise from alarming ones, when it is worth calling a professional, and when simple DIY actions are enough. We will pay special attention to models with a system No Frost and an inverter compressor - their behavior after defrosting often raises the most questions.

For clarity, we have compiled a comparative table of sounds, added a checklist for self-diagnosis and answers to frequently asked questions. If your refrigerator Atlant, Samsung, LG or Indesit started to crack after defrosting, this article will help you understand the situation without extra costs for a service center.

1. Physical processes: why cracking is normal

The main reason for cracking after defrosting lies in thermal expansion of materials. When the refrigerator thawed, its parts cooled to room temperature. After switching on, the internal elements begin to heat up or cool at different rates, which leads to microdeformations and characteristic sounds.

What exactly can crack:

• 🔹 Plastic panels cases - when heated, they expand slightly and rub against each other.
• ❄️ Ice residues in the drainage system - melt water freezes in the channels and bursts.
• 🌀 Tubes refrigerant - metal changes size with temperature changes.
• 📦 Door seal —the rubber gasket is “sucked” to the body during cooling.

These sounds usually subside after 1-3 hours after switching on (when the temperature in the chambers stabilizes). If the cracking does not stop for more than a day or is accompanied by other symptoms (for example, the refrigerator does not freeze), this is a cause for concern.

2. Cracking due to ice residue: drainage system and evaporator

One ​​of the most common causes of post-defrosting crackling is frozen water in the drainage system. During defrosting, melt water flows through special channels into the pan, but if defrosting was incomplete or the drainage hole is clogged, the liquid remains inside and freezes when turned on again.

How this manifests itself:

• 💧 Clicks and crackles at the bottom of the refrigerator (usually back).
• 🕳️ Water under the boxes for vegetables - a sign of overflowing drainage.
• ❄️ Ice at the bottom of the chamber even after defrosting.

What to do:

1. Turn off the refrigerator and let it stand for 1-2 hours with the door open.
2. Clean the drainage hole (usually located on the back wall of the refrigerator compartment) using a cotton swab or a special brush.
3. Rinse the water collection tray (located at the back or under the refrigerator).

Check the drainage hole for blockages|

Remove any remaining ice from the tray|

Rinse the channel with warm water and soda|

Wipe the back wall of the chamber dry-->

⚠️ Attention: If the drainage hole is clogged with mold or food debris, use a vinegar solution (1:1 with water) to disinfect. Do not use aggressive detergents - they can damage the plastic.

3. Problems with the compressor: when a crackling sound is a signal of malfunction

The compressor is the “heart” of the refrigerator, and its incorrect operation is often accompanied by atypical sounds. After defrosting, the load on the compressor increases, as it needs to quickly restore the set temperature. In this case, the cracking sound may indicate:

You should pay particular attention to cracking noises in refrigerators with with an inverter compressor (for example, Samsung RB30A3200SA or LG GA-B489YVQZ). These models operate almost silently in normal mode, so any post-defrost noise should alert you.

How to check the compressor yourself

1. Unplug the refrigerator and wait 10 minutes.

2. Turn it back on and listen: a normal compressor starts with one click, after which it runs smoothly.

3. If you hear multiple clicks or the compressor “jerks” (turns on and off immediately), this is a sign of a faulty start relay or winding.

4. In models with an inverter compressor (Hitachi R-BG410P6M, Panasonic NR-BN30A1), a crackling sound during startup is unacceptable - contact service.

4. Fan in No Frost systems: why does it crack? Refrigerators with a system (for example,

Refrigerators with system No Frost (For example, Bosch KGE39AW25R, Electrolux ENN2854AOW) are equipped with a fan to distribute cold air evenly. After defrosting, condensation may remain on the fan blades, which when frozen creates a crackling sound.

Other causes of fan noise:

• 🍃 Ingress of foreign objects (pieces of food, packaging).
• 🧊 Icing of the blades due to a malfunction of the heater defrosting.
• 🔧 Wear of bearings (characteristic “grinding” noise during rotation).

How to eliminate:

1. Disconnect the refrigerator and defrost it again for 12–24 hours (this will help remove ice from the fan).
2. Check whether ice or foreign objects are blocking the rotation of the blades.
3. If the cracking does not stop, it may be faulty defrost timer or heating element their replacement requires specialist intervention.

⚠️ Attention: Never try to disassemble the fan unit yourself in models with Full No Frost (for example, Liebherr CNef 4315). Incorrect assembly may result in refrigerant leakage and damage to the refrigerator.

5. Deformation of the door seal: the hidden cause of the cracking

The rubber seal on the refrigerator door loses its elasticity over time, especially if defrosting was carried out using sharp objects (knives, forks) to remove ice. After switching on, the seal may:

• 🔊 Crack when “sticking” to the body due to temperature changes.
• 🚪 Pass warm air, causing the compressor to work more intensely (which also causes noise).
• 🧲 Deformed and cling to the shelves when opening/closing.

How to check the seal:

1. Close the door with a piece of paper - if it pulls out easily, the seal is leaky.
2. Inspect the rubber for cracks or tears.
3. Wash the seal with warm soapy water and lubricate silicone grease (do not use vegetable oil!).

If The seal is damaged and needs to be replaced. For popular models (Atlant MXM 1705-80, Indesit DF 4180 W), elastic bands are sold in service centers or on marketplaces. The average cost is from 800 to 2500 rubles, depending on the brand.

6. Cracking due to uneven installation of the refrigerator

If the refrigerator is not level, vibrations during operation of the compressor or fan increase, which can be perceived as a cracking sound. After defrosting, the problem often worsens because:

• 📏 Condensation accumulates in one corner, creating additional load.
• 🌀 The drainage system does not work effectively, which leads to icing.
• 🔧 The compressor mounts become loose from vibrations.

How to level the refrigerator:

1. Use construction level to check the horizontal position.
2. Adjust front legs (usually they have threads to change the height).
3. If the floor is uneven, place rubberized ones under the rear legs linings.

The optimal tilt of the refrigerator is 1–2° back (the door should close on its own with a slight push). In models with automatic closing system (Samsung RB37J5230SS) incorrect installation can lead to malfunctions of the mechanism.

7. When to call a professional: 5 alarming symptoms

In most cases, a cracking sound after defrosting does not require the intervention of a specialist. However, there are signs that you should immediately contact a service center:

If your refrigerator is under warranty, do not try to repair it yourself - this may void the warranty. On average, the warranty for the compressor is 5–10 years, for other parts - 1–2 years (check the conditions in the device passport).

⚠️ Attention: When contacting the service center, be sure to inform the technician that a cracking sound has appeared after defrosting. This will help to quickly diagnose the problem and avoid unnecessary replacement of serviceable parts.

Frequently asked questions about crackling after defrosting

❓ The refrigerator has been cracking for 2 days after defrosting - is this normal?

No, it’s normal post-defrost crackling should subside within 1–12 hours. If the noise persists for more than a day, check:

• Is the drainage hole clogged (sign: water under the drawers).
• Is something touching the fan blades (in No Frost models).
• Is the compressor fastening loose? (knock on the back wall - if the sound changes, adjustment is needed).

If all else fails, call a technician to diagnose the compressor or defrost system.

❓ Is it possible to use a refrigerator if it crackles, but freezes?

Yes, if:

• The crackling sound is not accompanied by other malfunctions (unstable temperature, puddles inside, etc.).
• The sound subsides a few hours after switching on.
• The refrigerator does not emit a burning smell or does not spark.

However, if the crackling increases over time or appears with each cooling cycle, this may indicate wear of parts (for example, fan bearings). In this case, it is better to carry out a preventive inspection.

❓ Why does a new refrigerator crack after the first defrost?

In new refrigerators (especially with inverter compressor), a crack after the first defrost may be associated with:

• By "grinding in" parts —plastic elements adapt to temperature conditions.
• Residual air in the system cooling (typical for models transported lying down).
• Factory lubrication on moving parts (fan, compressor), which is “distributed” in the first days of operation.

If the cracking does not disappear after 3–5 days, contact the store for a replacement under warranty.

❓ How to defrost a refrigerator to avoid cracking?

Follow this algorithm:

1. Unplug the refrigerator and remove all food.
2. Place a tray to collect water and open the door wide open.
3. Do not use a hairdryer or hot water to speed up the process - a sharp temperature change can deform the plastic.
4. Every 2 hours, remove melt water from the shelves and from the tray.
5. After complete thawing, wipe all surfaces dry and leave the door open for 1-2 hours for ventilation.
6. Only then turn the refrigerator back on.

For models No Frost defrosting is sufficient 1 time every 6–12 months (if there is no visible ice).

❓ A cracking noise is heard only in the freezer compartment - what's the matter?

If the crackling noise comes specifically from the freezer, the most likely reasons are:

• Ice in the drainage channel freezer compartment (typical for models with drip system).
• Faulty defrost heater (in No Frost systems).
• Cracks in plastic internal shelves (due to overload or mechanical damage).
• Problems with the switching valve between the chambers (in two-compressor models).

Try to completely defrost the freezer for 24 hours. If the cracking remains, check the integrity of the plastic parts and contact the service to diagnose the defrost system.