The situation when a refrigerator makes cricket sounds often confuses owners, since the usual hum of a running motor is replaced by an alarming chirping or crackling sound. This specific noise can appear periodically or sound constantly, disturbing the silence in the apartment and raising concerns about the serviceability of the equipment. In most cases, such acoustic effects are associated with thermal expansion of materials, the operation of the defrosting system, or the operating features of the compressor, but sometimes they signal serious malfunctions.
Understanding the nature of the occurrence of extraneous sounds is the first step to solving the problem without calling a technician. It is important to distinguish between natural operating noises, characteristic of modern No Frost systems, and mechanical knocks that require intervention. In this article, we will analyze in detail the physical reasons for the appearance of sounds reminiscent of the chirping of insects, and determine in which cases urgent repairs are required.
Physics of the process: thermal expansion of plastic and metal
The most common reason why a refrigerator crackles like a cricket is a banal physical phenomenon - thermal expansion and contraction of materials. The inner walls of the chamber, plastic boxes and the evaporator are constantly exposed to temperature changes. When the compressor turns on and begins to pump in cold, or vice versa, turns off, the temperature of the elements changes sharply. At this moment, plastic and metal change their geometric dimensions, which causes a characteristic crackling sound, which can easily be confused with chirping.
Such sounds are especially often produced by new refrigerators or those that have not been defrosted for a long time. An ice crust on the evaporator can create additional stress in the structure, increasing the sound during defrosting. If your refrigerator Indesit or Atlant makes such sounds, this is often a variant of the norm, especially if the crackling noise is heard while the unit is idle or immediately after the motor is stopped.
The intensity of the sounds depends on the quality of the plastic used in the production of the internal lining. Cheap grades of polymer can react more loudly to temperature changes. It is also worth considering that when you turn it on for the first time after purchase or after long-term transportation, the equipment may “make noise” more actively during the adaptation period.
⚠️ Attention: If the crackling sound is accompanied by the smell of burning or melted plastic, immediately disconnect the device from the network. This may indicate overheating of the wiring or contacts, which creates a risk of fire.
To minimize such effects, it is recommended to check that there are no foreign objects, shelves or dishes adjacent to the walls of the chamber. The contact of a glass shelf or metal pan with a vibrating wall can enhance resonance and create the illusion of constant operation of the mechanism.
Problems with the compressor: wear and vibration
When the refrigerator hums like a cricket, the source of the sound is often the compressor itself - the heart of the refrigeration unit. In modern inverter models, the motor operates almost silently, but old units or models with traditional piston compressors can make a variety of sounds when internal parts wear out. Whirling can occur due to loosening of the motor mounts, when vibration is transmitted to the housing and resonates.
Another reason is the operation of the start relay. If this element is worn out, it may make frequent clicking or cracking noises when you try to start the engine. In some cases, the compressor tries to start, but due to insufficient voltage or a malfunction of the relay, a series of rapid clicks is heard, very reminiscent of the chirping of a cicada.
- 🔧 Loosening of the bolts securing the compressor to the refrigerator frame.
- 🔧 Wear of the bearings or piston group inside the motor.
- 🔧 Malfunction of the start-up relay, causing chaotic switching on.
- 🔧 Vibration of the tubes leading to the compressor against the housing or other elements.
It is better to diagnose the condition of the compressor by placing your hand on the motor housing (behind the refrigerator). If the vibration seems excessive or uneven, but the sound is coming from that location, there is likely a mechanical problem with the unit. In models LG and Samsung with linear compressors, a characteristic clicking sound when starting and stopping is a design feature, but loud chattering during operation should be alarming.
If you notice that the refrigerator began to make cricket sounds precisely at the moment of starting or stopping, this often indicates problems with the electrical part or pressure in the system. In such cases, it is better not to delay diagnostics, since operating the engine in abnormal mode can lead to its complete failure.
No Frost system and fan operation
In refrigerators with the system No Frost the source of the “cricket” sound is often the fan circulating cold air. The fan blades may hit frozen ice if the defrost system is not working correctly. Ice builds up on the evaporator and the air duct, reducing the clearance for the impeller to rotate. When the blades come into contact with the ice crust, a rhythmic cracking or chirping sound is heard.
In addition, the fan itself may have reached its end of life. The sleeve bearings in the fan motor dry out or become dirty over time, causing noise when rotating. The sound may resemble a chirping sound, especially if the fan axis has play.
To test this hypothesis, you need to open the door of the refrigerator or freezer (depending on where the fan is located). On many models, the fan stops when the door is opened. If the sound disappears immediately after opening the door, then the problem is definitely in the fan or ice freezing in the evaporator.
| Symptom | Probable cause | Location | Necessary actions |
|---|---|---|---|
| Rhythmic crackling | The blades touch the ice | Freezer compartment | Defrosting 24 hours |
| Constant humming sound | Bearing wear fan | Rear wall (hidden) | Replacing the fan |
| Sound when opening the door | Door sensor malfunction | Door opening | Checking contacts |
| Sound only at night | Thermal expansion | Throughout the entire body | Safe, does not require repair |
It is important to note that in two-chamber refrigerators Bosch or Siemens fans can be located both in the freezer compartment and in the refrigerator. Sound localization will help you understand which node requires attention. If the sound is coming from the top of the refrigerator compartment, most likely there is a problem in the upper air duct.
Boiling and gurgling of the refrigerant
Sometimes users describe the sounds inside the refrigerator as a “cricket”, although in fact they hear the movement of freon through the pipes. After the compressor stops, the pressure in the system equalizes and the refrigerant continues to move, making sounds similar to water pouring, gurgling or a quiet hiss. In combination with the vibration of the tubes, this can create a complex acoustic effect.
If an air lock has formed in the system or a freon leak has occurred, the nature of the sounds changes. A louder hiss or whistle appears. However, if the refrigerator simply “talks” after turning off, making quiet clicks and overflows, this indicates normal operation of the capillary tube and thermostatic valve. data-i="109">Yes, if an air lock has formed in the refrigerant circulation circuit (which happens after poor-quality repairs), the sound of gas movement becomes more intermittent and noisy, reminiscent of chirping. This requires evacuation of the system and refilling. thermostatic valve and capillary tube.
Could air in the system cause the chattering noise?
Yes, if an air lock has formed in the refrigerant circulation circuit (which happens after poor-quality repairs), the sound of gas movement becomes more intermittent and noisy, resembling a chirping sound. This requires the system to be evacuated and recharged.
It is worth listening to exactly when the sound occurs. If it accompanies the operation of the motor or occurs immediately after it stops, these are hydrodynamic processes. If the sound appears at any time when the refrigerator is just standing, it is most likely not freon.
Faults of the defrost heating element and timer
In systems No Frost The heating element (heating element) is periodically turned on to defrost the evaporator. If the heating element is faulty or gets wet, it may make sounds similar to frying or crackling. The source of the problem may also be a defrost timer or an electronic control module that makes clicking noises when switching modes.
Particular attention should be paid to the condition of the drainage system. If water from melting ice does not go into the drainage hole, but accumulates and begins to boil on a hot heating element, a loud hissing and crackling sound is heard. This is not only noisy, but also dangerous, since water can get on the electrical contacts.
- ❄️ Ice freezing on the heating element causes a crackling sound when heated.
- 💧 Water getting on hot elements causes hissing.
- ⚡ Sparking contacts of a timer or relay defrost produces a sound similar to chirping.
Checking the heating element requires disassembling the rear panel of the freezer. You can visually assess the condition of the spirals: they should not have breaks or traces of a short circuit. In models Whirlpool i Candy a situation often occurs when the heating element becomes deformed and begins to touch the plastic or metal of the case, causing a characteristic sound when heated.
⚠️ Attention: Diagnostics of live elements (heating element, fan) must be carried out in compliance with safety precautions. Be sure to disconnect the refrigerator from the electrical outlet before removing the panels and touching the internal components.
Instructions for self-diagnosis
Before calling a technician, try to carry out the initial diagnosis yourself. This will help you more accurately describe the problem to a specialist or, perhaps, fix it yourself. Start by determining the exact location of the sound: from below, from behind, inside the camera, or from above.
Try lightly pressing different parts of the body with your hand when the sound is heard. If the noise stops when you press the panel, then the problem is vibration and resonance. Also check the installation of the refrigerator: it must stand strictly horizontally, supported by all legs.
☑️ Noise diagnostics
If after defrosting for 24 hours (completely disconnecting from the network with the doors open) the sound does not disappear, then the problem is not in the ice. In this case, it is worth paying attention to mechanical fastenings and electrical components. Record the nature of the sound on a voice recorder - this will greatly help the technician during a remote consultation.
When you need to call a technician
There are situations when independent repair is impossible or dangerous. If the "cricket" sound is accompanied by an increase in the temperature in the chambers, this indicates a serious problem with the circulation of the refrigerant or the operation of the compressor. Also, a reason to call a specialist is the appearance of a burning smell, smoke or sparking.
If you determine that the compressor itself is chirping, or the sound is coming from a sealed-off system (tubes with freon), it is strictly not recommended to intervene on your own. Specialized equipment is required to diagnose the pressure and composition of the gas.
In cases where the refrigerator makes cricket sounds due to a malfunction of the electronic control module, professional flashing or replacement of the board is required. Attempts to repair electronics without the appropriate knowledge can lead to complete failure of the unit.
Prevention of extraneous noise
In order for your refrigerator to operate quietly and for a long time, it is important to follow the operating rules. Regular defrosting (even for the system No Frost once every year and a half) will help avoid ice build-up in hard-to-reach places and reduce the load on the fan and compressor.
Make sure that the food does not touch the back wall of the refrigerator compartment, where the cold air supply channels are located. This will prevent food from freezing and preventing circulation, which can also cause noise.
Regularly check the cleanliness of the condenser (the grille at the back of the refrigerator). A condenser clogged with dust causes the compressor to work overload, which increases vibration and noise. Cleaning with a vacuum cleaner or a soft brush once every six months will extend the life of the unit.
Why does the refrigerator only crack at night?
At night, the overall noise level in the apartment decreases, and the operating mechanisms become more audible. In addition, the voltage in the electrical network often changes at night, which can affect the operation of the compressor. Also, the temperature difference between day and night can enhance the effect of thermal expansion of materials.
Is chirping dangerous for food?
Sound itself does not affect the safety of food. The only danger is the cause of the sound: if, due to a compressor malfunction or a freon leak, cold production stops, the food may spoil. Monitor the temperature in the chambers.
Could the sound of a cricket be a sign of a broken inverter motor?
Inverter motors usually operate very quietly. chirping, this may indicate a malfunction of the inverter control board or mechanical wear of the bearings, which is less common than in conventional motors, but requires repair.
How to distinguish the sound of a cricket from the sound of cockroaches?
The sound of a mechanical nature (refrigerator) is usually more rhythmic, metallic or plastic, and is associated with on/off cycles. The sound of insects is more chaotic, can change timbre, and is often heard in silence when the refrigerator is not working. You can also use a flashlight for visual search.
Do you need to replace the refrigerator if it starts to crack?
In most cases, replacement is not required. The problem can be solved by replacing the fan, defrosting or repairing the compressor. Only in case of serious damage to the housing or complete failure of the motor when the equipment is very old, should you think about buying a new one.