A sudden crackling sound in the refrigerator can unsettle any owner of household appliances, especially if the sound occurs in the silence of the night. Extraneous noise often signal a malfunction of internal systems, but are not always a harbinger of expensive repairs. It is important to correctly classify the sound: it could be the harmless clicking of a thermostat or the alarming hum of a worn-out motor.
Before calling a technician, it is necessary to carry out initial diagnostics to exclude simple operating errors. Refrigerant circulation, fan operation or expansion of housing materials - all these processes can be accompanied by sound effects. In this article we will analyze in detail why the refrigerator is crackingand determine in which cases the equipment requires immediate intervention.
Ignoring specific sounds can lead to failure of expensive components, such as compressor or No Frost system. If the crackling is accompanied by a cessation of cooling or the appearance of puddles under the equipment, operation should be stopped immediately. Let's figure out what mechanisms make sounds and how to deal with them.
Natural sounds of refrigeration equipment
Do not panic ahead of time, since many modern models of refrigerators, especially those equipped with a system No Frost, produce various sounds during normal operation. Freon circulation through the evaporator tubes is often accompanied by gurgling or a slight hiss, which is the norm. Also, a characteristic cracking sound can be produced by the plastic of the internal housing.
When the temperature inside the chambers changes, the walls and shelves narrow or expand, which causes sound effects resembling crackling or clicking. This is especially true for new refrigerators or after prolonged defrosting. Typically, such sounds do not pose a threat and stop on their own.
- 🔊 Thermoregulator: Clicks when turning the compressor on and off are a sign of working automation.
- 🌬️ Fan: A uniform hum or whistle indicates the operation of the blowing system in No Frost models.
- 💧 Refrigerant: Gurgling and overflowing of liquid in the tubes is a normal process of boiling and condensation of gas.
However, if the nature of the sounds has changed sharply, you should listen more carefully. Sometimes users confuse natural noise with an incipient breakdown, but it is better to double-check the condition of the equipment. If a cracking noise is heard every 15-20 minutes, most likely it’s just a defrost cycle defrost cycle.
Problems with the defrost system and ice freezing
One of the most common causes of cracking in system refrigerators No Frost is the formation of ice fur coats on the evaporator. When the layer of ice becomes too thick, it begins to interfere with the fan's operation. The fan blades hit the ice build-up, producing a characteristic cracking or knocking sound, which can become stronger over time.
⚠️ Attention: Operating a refrigerator with a faulty defrost system can lead to fan failure and compressor overload. Do not ignore the increasing noise.
In this case, it is necessary to completely defrost the equipment. Unplug the refrigerator, open the doors and leave it for at least 24 hours. Even if ice is not visually visible, it may be deep inside the case behind the plastic panels. After defrosting, the equipment should work more quietly.
☑️ Checking the defrost system
If after defrosting the cracking noise resumes a few days later, then the problem lies in a malfunction of the defrost system components. This could be a burnt out, faulty timer or defrost sensor. In such cases, replacement of failed elements is required. Defrost heating element, faulty timer or defrost sensor. In such cases, replacement of failed elements is required.
Why does the ice not melt?
Ice may not melt due to the fact that the heating element does not receive voltage. Often it is not the heater itself that burns out, but the thermal fuse, which is in series in the circuit. Replacing it is inexpensive, but requires disassembling the back wall of the freezer. Often the cause is
Compressor and start relay malfunctions
The compressor is the heart of the refrigerator, and its operation is rarely completely silent. However, if you hear a loud metallic cracking, clanging or humming sound that turns into vibration, this is a warning sign. Often the reason is starting relaywhich, when worn, begins to click loudly when trying to start the engine.
If the compressor hums, but does not start, and after a few seconds a loud click is heard and the buzzing stops - this is a classic symptom of a faulty starting device or a jammed piston group. In some. In cases, the compressor housing itself may produce a cracking sound due to weakening of internal springs or fastenings.
| Sound type | Probable cause | Difficulty of repair | Risk for equipment |
|---|---|---|---|
| Loud click and silence | Start relay / Compressor | Medium / High | High (winding combustion) |
| Metal clanging | Internal motor wear | Replacement of the compressor | Critical |
| Vibration with a crackling | Loose fastenings | Low | Low |
| Uniform hum | Normal operation | Not required | Absent |
Replacing the starting relay is a procedure that can be performed with your own hands, if you have basic skills in working with electrical equipment. However, diagnosing the condition of the compressor itself requires special equipment and knowledge. If the motor makes sounds of breakdown or a burning smell, independent repair is prohibited. the compressor requires special equipment and knowledge. If the engine makes sounds of breakdown or a burning smell, independent repairs are prohibited.
The influence of the location and vibration of the housing data-i="121">Sometimes the source of the crackling sound is not inside the unit at all, but is associated with its installation. If the refrigerator is not level, the vibration of the running motor is transmitted to the floor, walls or nearby objects. This causes a resonating crackling or rattling noise, which is easily mistaken for a breakdown.
Sometimes the source of the crackling sound is not inside the unit at all, but is associated with its installation. If the refrigerator is not level, the vibration of the running motor is transmitted to the floor, walls or nearby objects. This causes a resonating crackling or rattling noise that can easily be mistaken for a breakdown.
Check whether the back wall of the refrigerator, where the condenser and compressor are located, is touching the wall or furniture. When heated, the radiator grill may expand slightly and, in contact with an obstacle, make unpleasant sounds. It is also worth inspecting the space around the equipment.
- 📏 Gap: Leave at least 5-10 cm of space between the back wall and the wall for ventilation.
- 🔩 Supports: Adjust the legs so that the refrigerator stood steadily and did not wobble.
- 🧊 Neighborhood: Make sure that the shelves inside do not vibrate and the bottles do not touch each other.
Another nuance is that objects standing on the top lid of the refrigerator. Even a light vase or box of cereal can begin to vibrate and rattle due to the operation of the motor. Remove all foreign objects from the top panel and check if the sound has disappeared.
Foreign objects and defects. fan
In models with the system No Frost the fan is responsible for air circulation. Over time, a foreign object may get into its area: a piece of packaging, a piece of ice or even a wire, when the blades hit an obstacle, they emit a rhythmic crackling sound, the frequency of which depends on the rotation speed.
To test this hypothesis, open the freezer door. On many models, the fan stops when the door is opened. If the cracking stops immediately after opening, the problem is definitely in the fan or frozen ice. If the sound continues, the source may be in the lower part where the compressor is located.
⚠️ Attention: Do not try to reach foreign objects or check the operation of the fan with your fingers while the refrigerator is plugged in. This is life-threatening!
The noise may also be caused by a worn bushing or bearing of the fan itself. In this case, the sound will be more like a grinding or howling. Replacing a fan is usually not difficult, but requires selecting a similar model in size and connection connector.
How to get to the fan?
In most No Frost refrigerators, the fan is located behind the back wall of the freezer. It is necessary to remove the shelves, unscrew the fastening screws and carefully move away the plastic panel without damaging the sensor wires.
When you need to call a technician: critical signs
There are situations where independent actions can only aggravate the situation. If you notice that the refrigerator has stopped freezing with a bang, or a “coat” of ice has appeared on the back wall in one corner, and it’s dry in the other, this indicates a freon leak or a clogged capillary system.
Another critical sign is the smell of burning or melted plastic. This may indicate overheating of the wiring, melted insulation, or a malfunction of the electric motor. In such cases, you must immediately disconnect the device from the power supply and call a specialist.
Also, professional help is required if the cracking noise is accompanied by:
- 🔥 Heating of the side walls to critical temperatures.
- 💡 Flashing indicators or errors on the display.
- 🛑 Frequent stopping and starting of the engine (clocking).
Repairing a compressor or searching for a refrigerant leak requires a vacuum pump, a pressure gauge station and freon supplies. It is impossible to carry out high-quality repairs at home without equipment.
Frequently asked questions (FAQ)
Why does a new refrigerator crack in the first days of operation?
A new refrigerator can make sounds due to the adaptation of materials. The plastic contracts and expands during the first cooling cycles, and the compressor goes through a grinding-in period. If the cracking is not accompanied by loss of cold, this is normal.
Can a refrigerator crack if it is standing crookedly?
Yes, the misalignment of the housing leads to uneven vibration of the compressor and pipes, which causes knocking and crackling. Be sure to adjust the feet to the level.
Is it dangerous to continue to use the refrigerator if it is cracking?
If the cracking is caused by ice or vibration, it is not dangerous, but noisy. If the reason is electrical or mechanical wear of the compressor, further operation can lead to complete failure of the equipment.
How to distinguish the sound of a thermostat from a breakdown?
The thermostat makes a clear, single click when the motor is turned on or off. A breakdown is characterized by serial crackling, grinding or continuous humming.
Does it need to defrost a refrigerator if it has a No Frost system?
Yes, at least once a year. The No Frost system does not mean a complete absence of ice. In hard-to-reach places and drainage, ice can accumulate, causing noise and disruption of air circulation.