The situation when the refrigerator is cracking or makes unusual sounds can unsettle any owner of household appliances. Sudden clicks, buzzing or occasional cracking noises are often perceived as signs of serious damage that require expensive repairs. However, do not panic ahead of time, since many sound effects are the norm for properly operating equipment.
Modern models of climate control equipment, be it budget Indesit or premium LG, work on similar physical principles, but may have different acoustic characteristics. Understanding the nature of these sounds allows you to quickly determine whether the noise is a sign of a malfunction or normal operation of the cooling system. In this article, we will examine in detail the mechanics of the processes that cause the crackling sound and methods for diagnosing them.
It is important to distinguish the nature of the sounds: the rhythmic hum of a compressor differs from sharp blows or the ringing of falling objects. Analysis of acoustic signals helps save time on calling a specialist if the problem is solved by simple adjustment or rearrangement of products. Let's look at the main scenarios why your equipment may make extraneous sounds.
Natural sounds of a working refrigerator
Many users mistakenly believe that a working refrigerator should operate absolutely silently. This is a misconception, since physical processes are constantly occurring inside the device, accompanied by sound. Work cycle includes compression of the refrigerant, its movement through the tubes and a change in the state of aggregation, which inevitably creates background noise.
Especially often, owners notice that the refrigerator is cracking immediately after turning the compressor on or off. This is due to thermal expansion and contraction of materials. The plastic parts of the internal housing and the metal tubes of the evaporator change their size when the temperature changes, which causes a characteristic crackling sound, reminiscent of a fire cooling down or the cracking of ice.
Sounds may be more pronounced in models with a system No Frostwhere the fans are actively working. If the sound is monotonous and is not accompanied by other symptoms (for example, lack of cold), then most likely everything is in order with your equipment. However, it is worth listening to see if the tone of the noise has changed recently.
- 🔊 Thermal expansion: Crackling of plastic and metal when the temperature of the chamber walls changes.
- 🌀 Movement refrigerant: Gurgling or overflowing of liquid in the tubes after stopping the motor.
- 💨 Fan operation: Uniform air hum in systems with forced circulation.
It is worth noting that new models can “break in” and begin to sound different after a few weeks of operation. If the refrigerator clicks rarely and irregularly, this often indicates normal operation of the thermostat or start relay.
Installation problems and vibration of the case
One of the most common reasons is why the refrigerator is humming and vibrates is due to incorrect installation. Even a perfectly working compressor creates vibration, which is transmitted to the housing and, upon contact with surrounding objects, increases significantly. If the appliance is not level, the load on the legs is distributed unevenly, causing resonance.
Check whether the back wall of the refrigerator or its side panels is touching the wall, furniture or curtains. The vibration of the compressor is transmitted to these surfaces, causing them to rattle. Also make sure that nothing has fallen inside the chambers or is loose, creating additional noise when the motor is running.
⚠️ Attention: Before adjusting the legs, be sure to disconnect the device from the power supply. Working with live electrical components is prohibited by safety rules.
To eliminate noise, it is often enough to set the horizontal correctly. Use a building level or simply rock the body: it should stand stable and not wobble from side to side. Adjusting the height of the legs allows you to compensate for uneven floors and reduce the level of vibration.
If the floor at the installation site is wooden or has a weak structure, vibration may increase. In such cases, you can place special anti-vibration pads or a piece of dense rubber under the legs, which will significantly reduce the noise level.
Malfunctions of the compressor and start relay
When the refrigerator is cracking loud and rhythmic, especially when trying to start, the problem may lie in the heart of the unit - the compressor. The starting relay is responsible for supplying voltage to the motor windings. If it is faulty, you hear a series of clicks, followed by a hum, and then a click again and a stop.
This situation indicates that the motor is trying to start, but cannot gain the required speed. This may be caused by wear on the relay itself, a jammed compressor piston group, or problems with the electrical circuit. You cannot leave the equipment in this condition, as this can lead to burnout of the windings.
You can diagnose a relay failure visually: if carbon deposits are visible on the contacts or the plastic has melted, the element requires replacement. In some cases, replacing the starting device helps, which is a relatively inexpensive repair compared to replacing the compressor.
- ⚡ Clicks when starting: Symptom of a faulty starting relay or open circuit.
- 🔥 Humming without starting: An attempt to turn the motor when jammed.
- 🛑 Shutdown after 5-10 seconds: Thermal protection triggered due to overload.
Is it possible to replace the relay yourself?
Replacing the starting relay is a procedure accessible to a person with basic skills. It is necessary to remove the back cover, photograph the connection diagram, disconnect the wires and replace the part with a similar one. However, if you are not confident in your abilities, it is better to entrust this to a professional.
If the compressor works, but makes a metallic clanging or knocking noise, this may indicate internal wear on the valves or shock absorbers. In this case, refrigerator repair may require replacing the entire unit, since disassembling the sealed motor is not economically feasible.
Clogged capillary tube and problems with freon
Sometimes the refrigerator cracks or makes sounds similar to bursting bubbles due to problems in the refrigeration circuit. Clogged capillary tube is one of these reasons. The system circulates refrigerant (freon) and oil; if an ice plug or a blockage with oil breakdown products forms in the tube, the flow of the substance is disrupted.
The compressor begins to work with increased load, trying to push gas through a narrow hole. This causes a characteristic gurgling, whistling or crackling sound. The pressure in the system increases, which is dangerous for the integrity of the circuit. A blockage can be determined by uneven cooling of the chambers or freezing of certain areas.
Sounds can also be made when freon leaks. If there is little refrigerant left in the system, the compressor circulates a void or a mixture of gas and air, which changes the acoustics of its operation. In this case, freon and leak detection become mandatory procedures. refilling the refrigerator freon and leak detection become mandatory procedures.
| Symptom | Probable cause | Sound character | Necessary actions |
|---|---|---|---|
| The engine hums, but does not start | Malfunction of the starting relay | Rhythmic clicks | Replacing the relay |
| Gurgling after switching off | Freon movement | Burbling, transfusion | Normal (does not require repair) |
| Whistling or hissing | Clogged capillary tube | High-frequency whistle | Purge the system, replace the filter |
| Loud cracking sound when touched | Vibration of the case | Rattling | Adjusting the legs, move them away from the wall |
Climb into the refrigeration circuit yourself without special equipment (vacuum pump, pressure gauges) is not allowed. This requires professional intervention to restore the tightness and refill the system.
Foreign objects and products in the chambers
Before calling a technician, if the refrigerator makes soundscarry out a simple inspection of the internal space. Often the source of noise is the food or dishes themselves. Glass bottles, coming into contact with each other due to the vibration of the shelves, create a ringing noise that can easily be mistaken for equipment failure.
Check whether small objects (lids, foil, labels) have fallen behind the back wall inside the chamber or into the vegetable compartment. If they get into the fan operating area (in No Frost systems), they cause a loud crash and can damage the blades. It is also worth inspecting the shelves: if they do not fit tightly in the grooves, they will rattle.
Pay attention to the objects placed on the top panel of the refrigerator. Magnets, spice jars, or decorative items may resonate with the vibration of the case. Remove all excess from the roof and sides of the unit to localize the source of the sound.
If you find that the noise is coming from inside, try removing all the products and listening to the equipment in an empty state. This will help to accurately determine whether the problem lies in the contents or in the mechanism itself.
Features of the No Frost system
Owners of modern models often ask why the refrigerator is cracking, although this was not the case before. In systems No Frost a fan is responsible for cooling, which circulates cold air. Over time, ice may freeze on the fan blades or axis if the defrosting system does not work correctly.
An ice crust interferes with free rotation, and the fan begins to touch the ice or duct walls with its blades. This causes a loud cracking, squeaking, or humming noise. The sound may appear or disappear depending on the defrost cycle.
⚠️ Attention: If you hear the fan grinding, do not try to turn it manually when the refrigerator is plugged in. This can lead to injury or damage to the motor.
To fix the problem, it is often necessary to completely defrost the refrigerator in the off state for 10-12 hours. This will allow the ice to melt and free the fan. If after defrosting the sound returns after a few days, it means that the defrost sensor, heating element or timer is faulty.
☑️ No Frost noise diagnostics
Regular preventative defrosting (once every 6-8 months) even for No Frost systems helps extend the life of the fan and prevent the formation of ice jams in the drainage system.
When you need to call a specialist
There are a number of signs in which self-repair is not only ineffective, but also dangerous. If The refrigerator is cracking and at the same time it stops freezing, or a “fur coat” appears on the walls, and it’s warm inside, this is a signal of a serious malfunction. You should also sound the alarm if you smell burning or burnt wiring.
Professional diagnostics are necessary if you hear metallic knocks inside the compressor, which indicates its mechanical destruction. The technician will be able to accurately determine whether the unit can be restored or whether it is easier to buy new equipment. Compressor repairs often account for up to 70% of the cost of a new refrigerator.
Do not ignore repeated relay clicks if they last more than a day. Prolonged operation in this mode can lead to a fire in the wiring. It is better to play it safe and call a specialist to measure the current and pressure in the system.
Remember that opening the refrigeration circuit without a license and equipment is prohibited, since refrigerants can be dangerous to the environment and human health when improper handling.
Why does the refrigerator crack only at night?
At night, extraneous sounds in the house subside, and the operation of the equipment becomes more noticeable. In addition, at night the voltage in the electrical network may stabilize or, conversely, jump, which affects the operation of the compressor. Also, at night, other household appliances often turn on, creating resonance.
Is it dangerous if the refrigerator makes a loud click and turns off?
Yes, this is a sign that the protection has tripped. The compressor tries to start but cannot, and the thermal relay opens the circuit to prevent the windings from burning out. Diagnostics of the starting device and motor is required.
Can a new refrigerator crack?
Yes, new refrigerators can make sounds of grinding parts, plastic expansion and the operation of new mechanisms. Usually after 1-2 weeks of operation the noise decreases. If the cracking noise is very loud, check the shipping bolts (if they were on the compressor) and the installation.
How to extend the life of the compressor?
Do not place hot products, provide a gap at the back wall for ventilation, defrost regularly (even No Frost once a year) and protect equipment from power surges using a stabilizer.