A sound like a cricket that suddenly appears in the refrigerator can unsettle any owner of household appliances. This shrill, rhythmic chirping or cracking sound often occurs when the unit is turned on or off, disturbing the silence in the kitchen and causing reasonable fears for the safety of food. Unlike the usual humming of a motor, such high-frequency noises signal specific malfunctions in the electrical or mechanical part of the device.
The nature of this sound can vary from a harmless click of a thermostat to alarming signs of a dying compressor. Accurate identification of the source of noise is the first and most important step before calling a technician or attempting self-repair. Users often confuse mechanical knocking with electrical crackling, which leads to incorrect diagnosis and unnecessary costs.
In this article we will analyze in detail all the possible reasons why a refrigerator makes a sound like a cricket, and we will propose an action algorithm for each situation. Understanding the physics of the processes occurring inside the refrigerator compartment and engine compartment will help you make the right decision about further actions.
Mechanical causes of chirping: fan and ice
One of the most common reasons why a refrigerator makes a sound like a cricket is operation No Frost system fan. If ice builds up in the freezer, the fan blades may hit ice crystals. This creates a characteristic cracking or chirping sound, which often intensifies when the door is opened, when the fan changes operating mode or stops.
In systems with forced air circulation, foreign objects can also become a source of noise. A piece of cling film, a label or a broken piece of ice that gets into the rotation zone of the blades causes a rhythmic beating. Fan motor This may work properly, but a mechanical obstacle creates an acoustic effect reminiscent of the chirping of insects.
Another mechanical factor is vibration of refrigeration circuit tubes. If the copper lines leading to the compressor are located too close to each other or to the housing walls, they may resonate when the motor starts. This rattling noise is often disguised as a high-frequency squeak or crackling sound.
To eliminate the problem with ice, it is often necessary to completely defrost the refrigerator within 10-12 hours. However, if the sound returns a few days after switching on, this may indicate a malfunction defrost systemsthat has not had time to remove condensation.
Electrical clicks: relays and inrush currents
If the sound is more like an electrical crackling or rapid clicks, reminiscent of chirping, the source may be start-up relay the compressor. This component is responsible for starting the engine and protecting it from overloads. If the contacts are worn out or the internal coil is faulty, the relay may make sounds similar to the work of a cricket, especially when trying to start.
Frequent cyclic switching on and off of the compressor, accompanied by clicking sounds, often indicates that the refrigerator cannot reach the desired temperature. This may be caused by a freon leak or a leak in the circuit. The compressor tries to start, the relay clicks, but the engine either does not start or stalls immediately.
Danger of working with a faulty relay
If the relay constantly clicks, but the compressor does not start, do not leave the refrigerator plugged in for a long time. This can lead to burning of the motor windings and expensive repairs.
In modern inverter models, the role of a traditional relay is performed by inverter control unit. Here the sounds may be quieter, but high-frequency. The electronics may make a squeaking sound when adjusting the compressor power, which is normal if it is not accompanied by a failure.
It is important to distinguish between single clicks of the thermostat and a series of quick clicks. The thermostat rarely clicks, only when the set temperature is reached or when it changes significantly. Serial crackling is always a sign of emergency operation of the electrical circuit.
Compressor malfunctions: when the motor “chirps”
The most alarming signal is when the sound like a cricket comes directly from compressor. If the engine is worn out, the internal valves may malfunction, creating a metallic clanging or chattering sound. This often happens in old refrigerators, where the life of the rubbing parts has expired.
Another reason is the weakening of the internal springs on which the motor-compressor is suspended inside the casing. When starting or stopping, the engine can hit the walls of the casing, creating a rumble that is perceived from a distance as a chaotic crackling sound. The vibration is transmitted to the body and amplified by resonance.
Diagnostics of the compressor requires caution. If, when you touch the body of a running motor with your hand (observing safety precautions!) you feel excessive vibration or hear the sound change when you press lightly, the problem may be in the fastenings. However, if the sound comes from inside the sealed flask, this is a sign of internal failure.
The table below shows the main signs of a compressor malfunction and their possible consequences:
| Symptom | Probable cause | Risk to equipment |
|---|---|---|
| Loud metallic clanging | Destruction of the valve group | High (compressor replacement) |
| Quiet crackling sound when starting | Wear of bearings or bushings | Medium (progressive wear) |
| Humming with transition to clicks | Piston group jamming | Critical (winding combustion) |
| Vibration of the housing | Separation of motor shock absorbers | Low (mechanical damage to tubes) |
The influence of temperature and thermostat
The thermostat (thermostat) is a device that controls turning the compressor on and off. In mechanical models, the contacts open with a characteristic click. If this click becomes louder, more frequent, or turns into a crackling sound, perhaps the thermostat itself is failing or its contacts are burning out.
In electronically controlled refrigerators, a sensor is responsible for regulating the temperature. It does not make sounds, but if its readings are incorrect, the compressor may operate in an abnormal mode, causing noise. Hypercooling or undercooling of the chamber is often accompanied by a change in the nature of the unit's operation.
Sounds similar to chirping can occur due to thermal expansion of materials. The plastic of the inner chamber, metal shelves or decorative panels may make a cracking noise when the temperature changes suddenly. This is a physical property of materials and is not a malfunction.
⚠️ Attention: If the cracking of plastic or metal is accompanied by the smell of burnt insulation or smoke, immediately unplug the refrigerator. This may indicate overheating of the wiring or melting of structural elements.
Checking the thermostat is possible by temporarily removing it from the circuit (for experienced users) or replacing it with a known good one. However, before changing parts, it is worth checking whether the temperature is set correctly. Too low settings force the equipment to work at its limit.
Diagnostics of sounds in different models of refrigerators
Different manufacturers use different technologies, which affects the acoustic profile of the equipment. For example, refrigerators Indesit and Atlant with classic compressors often produce louder mechanical sounds when starting up. At the same time, models LG or Samsung with inverter motors can squeak at high frequencies, which is not audible to the human ear, but is recorded as chirping on a recording or is perceived as background noise.
Two-compressor refrigerators can create an echo or resonance effect when one motor starts while the other is running. This creates a complex sound picture that is difficult to diagnose without experience. The sound like a cricket in such models can be the result of interference of waves from two operating units.
☑️ Primary diagnosis of noise
It is important to take into account the age of the equipment. In new refrigerators, extraneous sounds may be the result of a manufacturing defect or poor quality transportation (fastenings coming off). In old units, this is natural wear. The critical moment is the appearance of sound immediately after defrosting or movingwhich often indicates a violation of operating rules.
When you need to call a technician: critical signs
It is not always worth trying to eliminate the noise yourself. There are a number of signs that require professional intervention. If a sound like a cricket is accompanied by a lack of cold, this indicates a serious breakdown of the circuit or compressor.
Also an alarming signal is the heating of the refrigerator body in the area of the motor or side walls to uncomfortable temperatures. This may indicate an overload of the system or problems with heat dissipation, which are aggravated by improper operation of components that produce noise.
⚠️ Attention: Do not attempt to open a sealed circuit yourself or change the compressor without special equipment. This requires evacuation of the system and charging with freon, which cannot be done at home.
If you notice sparking in the area of the start relay or smell a burning smell, you must stop using the equipment. Continued activation may result in a short circuit and fire. In such cases, self-repair is limited to replacing visible external elements, if you have the appropriate skills.
Noise prevention and proper care
To minimize the risk of extraneous sounds, it is important to install the refrigerator correctly. It should stand on a flat surface, without distortions. Adjusting the legs allows you to compensate for uneven floors and reduce vibration, which often provokes rattling and resonance of the tubes.
Regular defrosting (for drip-type and No Frost models, if slush has formed) prevents the fan from becoming fouled with ice. Keeping the condenser at the back of your refrigerator free of dust also helps the compressor operate at its optimal level, reducing load and noise levels.
Make sure the chambers are full. An empty refrigerator operates differently than a full one, and the background sound may vary. However, overloading shelves is also harmful because food can shift and create vibration or block air flow, causing the fan to work harder.
FAQ: Frequently Asked Questions
Why does the refrigerator click but won't turn on?
This is a classic sign of a faulty start relay or compressor. The relay tries to start the engine, a click is heard, but the engine does not start due to jamming or an open circuit. The relay needs to be replaced or the compressor repaired.
Is it normal for the refrigerator to crack when defrosting?
Yes, during defrosting (especially in No Frost systems), sounds of ice thawing, water dripping and thermal expansion of plastic can be heard. If the cracking sound is not accompanied by sparks or a burning smell, this is normal.
Could the sound of a cricket be due to a bad socket?
Theoretically, yes. A poor connection in an outlet or plug can cause sparking that sounds like a crackling noise. Check whether the plug is heating up and the tightness of its connection to the socket.
How to distinguish the sound of a compressor from the sound of a fan?
The sound of a compressor is usually low-frequency, comes from below from behind and is accompanied by vibration of the case. The sound of the fan is higher, whistling or rustling, comes from inside the freezer and often changes when the door is opened.
What to do if the sound appears after moving?
If the refrigerator was transported lying down, it needs time (up to 24 hours) for the oil to drain into the compressor. If the sound is mechanical (knock), perhaps the motor mounts were torn off during transportation or the tubes were damaged.