Why does the refrigerator make cracking and clicking noises when operating

Faced with a situation where your refrigerator suddenly begins to make unusual sounds, many owners panic. Clicking, crackling or buzzing noises can disturb the peace in the apartment and raise concerns about the safety of food. Often these sounds are a natural part of the unit's operating cycle, but sometimes they signal serious problems that require immediate attention.

Understanding the nature of the sound is the first step to solving the problem. Compressor, the refrigerant and even the material of the shelves can be sources of noise. In this article, we will analyze in detail the mechanics of the occurrence of crackling sounds, separate safe sounds from dangerous ones, and determine when it is necessary to call a technician, and when you can handle it yourself.

It is important not to ignore sudden changes in the sound background of the operation of household appliances. If a previously quiet unit suddenly became loud, this is a reason to carry out diagnostics. We will look at all possible reasons: from simple heat shrinkage of plastic to failure of the start relay.

Natural sounds: shrinkage and movement of refrigerant

The most common cause of crackling noise, especially in new models of refrigerators, is a physical phenomenon known as heat shrinking. The inner walls of the chamber and the plastic parts of the housing are constantly exposed to temperature changes. When the compressor is turned on, they compress, and when turned off, they expand. This process is accompanied by a characteristic crackling sound, reminiscent of the sound of a car engine cooling down or the cracking of ice.

Usually this sound does not pose any danger to equipment. It is most often observed in refrigerators with a No Frostsystem, where temperature changes are sharper due to the active operation of fans and defrost heating elements. The plastic of panels, vegetable trays and door shelves reacts to changes in temperature by making short clicks.

However, you should be wary if the cracking becomes constant and does not stop even in idle mode. Under normal conditions, heat shrink sounds are intermittent. If you hear them every few seconds without stopping, the housing geometry may be broken or the unit is installed incorrectly, which creates constant stress in the materials.

⚠️ Attention: If the crackling sound is accompanied by a burning smell or visible melting of the plastic, immediately unplug the device. This may indicate overheating of the wiring or an electric arc, which creates a risk of fire.

The second source of natural sounds is the movement refrigerant (of freon) through the system tubes. As refrigerant changes from liquid to gas or vice versa, it may gurgle, shimmer, or make quiet clicking noises. This is especially noticeable immediately after the compressor stops, when the pressure in the system equalizes. This is a normal physical process, indicating the correct operation of the cooling circuit.

Owners should remember that modern models may be quieter than their old Soviet counterparts, but completely silent refrigerators do not exist. Knowing the nature of “healthy” noise will help you quickly identify the real problem if it arises.

Problems with the starting relay and compressor

If the crackling sound is loud and rhythmic, especially when trying to start the engine, the problem may lie in starting relay. This small element is responsible for supplying voltage to the compressor windings. When worn out or damaged, the relay begins to click, trying to start the engine, but to no avail. In this case, the compressor may hum, twitch, but not start, after which a protective click is heard and the process is repeated.

This situation is dangerous for motor-compressor. Repeated startup attempts without a successful start lead to overheating of the windings and can cause the final failure of an expensive unit. If you hear a series of clicks at intervals of several seconds or minutes, and the cold does not build up in the chambers, you must stop using the device.

Often the cause of the clicks is the compressor itself. Wear on internal mechanical parts, valves, or bearings may cause metallic knocking or popping noises during operation. Unlike soft heat-shrinkable plastic, this sound is harsher and is transmitted by vibration through the body. If the refrigerator is old, such wear may be natural, but it requires observation.

How to check the start relay yourself?

To check, you need to remove the back cover of the refrigerator, find the black box on the compressor and carefully remove it. Shake the relay: if you hear a ringing sound inside (like a broken coin), it means that the ceramic core is broken and the part needs to be replaced. However, remember that working with electrical components requires disconnecting the device from the network!

In some cases, clicks may be caused not by a breakdown, but by power surges in the network. If your apartment has unstable electricity, the refrigerator's automatic safety equipment may frequently trip, interrupting the operation of the compressor. To protect equipment in such conditions, it is recommended to use a voltage stabilizer.

Faults in the defrosting system and ventilation

In refrigerators with a system No Frost and drip defrosting system, defrosting heating elements and fans play an important role. A cracking noise may occur when the heating element is turned on or off. When the heating element's metal casing or aluminum evaporator suddenly heats up and cools down, it produces sounds similar to gunshots or a loud crash. This phenomenon is often called “thermal shock” of the metal.

Another source of noise is fan. If ice freezes on the blades of the fan that circulates air in the freezer, it begins to touch the walls or plastic casing. This causes a rhythmic crackling or knocking noise that gets louder as the engine runs. Often this sound appears after the refrigerator door has been kept open for a long time and moist air has gotten inside.

If the fan makes unusual sounds, it must be checked and, if necessary, defrosted. Sometimes, to eliminate the problem, it is enough to completely defrost the refrigerator during the day so that the ice in hard-to-reach places melts. If the sound returns after a few days after defrosting, the defrost sensor or timer may be faulty and the ice is freezing too quickly.

The effect of improper installation on the noise level

Often the cause of vibration and rattling, which is perceived as a crackling sound, is the incorrect installation of the refrigerator. If the unit is not on a level surface or is skewed, the compressor causes housing resonance during operation. The vibration is transmitted to the floor, walls and internal shelves, creating an unpleasant noise background. installation refrigerator. If the unit is not on a level surface or is skewed, the compressor causes housing resonance during operation. The vibration is transmitted to the floor, walls and internal shelves, creating an unpleasant background noise.

Check the legs of the refrigerator. They must be unscrewed so that the body is stable and does not wobble when pressed lightly. Many models have adjustable feet that allow you to compensate for uneven floors. If the refrigerator is close to a wall or furniture, vibration can be transmitted to them, causing rattling of interior items.

⚠️ Attention: Do not install the refrigerator closer than 5-10 cm from the wall. The rear grille of the condenser must be freely washed by air. Violation of the gap leads to overheating of the compressor and increased noise of its operation.

It is also worth checking the contents of the chambers. Bottles, jars or dishes placed on shelves may touch each other and vibrate. Try rearranging foods or placing silicone mats underneath them. Sometimes the source of sound even becomes egg trayif it is not secured tightly.

Mechanical damage and foreign objects

Mechanical causes should not be ruled out. Over time, the fastenings of shelves, drawers and trays weaken. Plastic ages, becomes more brittle and may crack under stress. Carefully inspect the internal elements: cracks in the plastic guides or loose fastenings of door handles can produce an echo that increases when the compressor is running.

Sometimes foreign objects can get into the space behind the refrigerator or into the vents. Small toys, pieces of food or construction debris near a vibrating cabinet or fan will create a constant annoying sound. It is recommended to move the refrigerator and inspect the space around and behind it.

If you find cracks on plastic parts, they can be temporarily fixed or replaced. The use of damaged elements not only creates noise, but can also lead to the shelf collapsing under the weight of the products.

When it is necessary to call a specialist

There are a number of signs in which self-repair is not only ineffective, but also dangerous. If clicks are accompanied by a lack of cold, this is a sure sign of a serious malfunction in the refrigerant circulation system or compressor control. Control module (electronic board) can also make quiet clicks when switching modes, but if this happens chaotically and the refrigerator does not maintain the temperature, professional diagnostics are needed.

A call to a specialist is required if:

• The compressor hums, clicks, but does not start, and is hot to the touch.
• The clicks are accompanied by the smell of burnt insulation or smoke.
• The refrigerator runs non-stop, trying to dial in temperature.
• Oily stains have appeared on the back wall or floor (a sign of freon or oil leakage).

Attempts to independently disassemble soldered circuit or replace the compressor without special equipment and skills can lead to final breakdown of the unit and loss of warranty. Modern refrigerators are complex devices where mechanics are closely connected with electronics.

Regular maintenance and timely defrosting (for models that require this) will extend the life of your refrigerator. Keep the rear condenser grill clean: a layer of dust and animal hair acts as a heat insulator, causing the compressor to work with overload, which inevitably leads to increased noise and wear of parts.

FAQ: Frequently Asked Questions

Is it normal for a new refrigerator to crack in the first week?

Yes, this is absolutely normal. New materials, especially the plastic of internal chambers and insulation, undergo a process of primary adaptation to temperature conditions. Intensive heat shrinkage in the first days of operation is a common cause of a crackling sound, which will become quieter or disappear over time.

Why does the refrigerator click immediately after turning off?

This sound is caused by pressure equalization in the cooling system. When the compressor stops pumping freon, the refrigerant flows from a high-pressure zone to a low-pressure zone, which is accompanied by a characteristic sound. Also at this moment, the thermal protection relay may be triggered.

Can a crackling sound be a sign of a freon leak?

A freon leak itself does not produce a crackling sound. However, if the leak occurs due to corrosion or mechanical damage, accompanying processes (moisture ingress, compressor operation in emergency mode) may cause extraneous sounds. But more often the crackling sound is mechanical or electrical, and not the tightness of the circuit.

What to do if the refrigerator clicks and does not freeze?

You must immediately disconnect the device from the power supply to prevent the compressor from burning out. Allow the equipment to cool for several hours. If, after turning it on again, the problem persists (you can hear the start click, but there is no cold), you need to call a technician to check the start relay and freon level.