A sudden extraneous sound in kitchen appliances always causes alarm to the owner, especially if it periodic clickingdisturbs the usual silence. A refrigerator is a complex unit where many mechanical and electrical processes are synchronized to maintain a given temperature, and any disruption in this harmony can be heard. Understanding the nature of sounds is the first and most important step to preserving your family's food and budget.
Clicks can be absolutely normal for certain operating modes, but they can also signal a serious malfunction compressors or control systems. It is important to be able to distinguish between these signals so as not to ignore the real problem and not panic over trifles. In this article we will analyze in detail the physical and electrical causes of sounds.
Modern models of refrigeration chambers, be it Indesit, LG or Atlant, are equipped with complex automation, which can also emit characteristic sounds when switching modes. A deep dive into the unit’s structure will allow you to independently carry out initial diagnostics and understand whether a call to the technician is required or a simple adjustment is sufficient.
⚠️ Attention: If clicks are accompanied by a lack of cold or overheating of the rear wall, immediately disconnect the device from the network to avoid a short circuit or fire of the wiring.
Normal operation thermostat and defrost system
The most common and safest reason why a refrigerator makes clicking sounds lies in the operation of thermostat (thermostat). This mechanism is responsible for maintaining the temperature inside the chambers by closing and opening the electrical power supply circuit of the compressor depending on the sensor readings. When the temperature rises above the set threshold, the thermostat closes the contacts, and you hear a distinct click of the engine starting.
A similar sound, but when the contacts open, is heard when the chamber has cooled to the desired value. On older mechanically controlled models, this sound can be quite loud and harsh due to the design of the bimetallic strip inside the control. In modern digital models, this process may be quieter, but the principle remains the same: electrical impulse transmitted to the actuator.
In addition, in refrigerators with a system No Frost clicks can be produced by dampers that regulate the flow of cold air, or valves that switch evaporator operating modes. These sounds often sound like soft clicks or crackles of plastic due to thermal expansion. If the cold in the chambers remains and the food does not spoil, then such sounds are normal.
- 🔊 A loud click when the engine starts is a sign that the start relay has activated.
- ❄️ A quiet click when the temperature is reached is the operation of the thermostat.
- 💨 Clicks inside the chamber - movement of the air duct dampers.
- 🔄 Periodic sounds every few hours - defrost cycle.
It is important to note that the frequency of these sounds directly depends on the load of the refrigerator and the ambient temperature. In the summer, when the kitchen is hot, the unit will turn on more often, and, accordingly, the number of clicks of the thermostat will increase. This is not a breakdown, but only indicates intensive operation of the cooling system in difficult conditions.
⚠️ Attention: Technical characteristics and location of sensors may vary depending on the specific refrigerator model. Always check the official manufacturer's instructions for your device.
Problems with the start relay and electrical circuit
If clicks are heard with a high frequency, but the refrigerator does not start or immediately stalls, the problem most likely lies in start-protective relay. This small component is responsible for supplying voltage to the motor windings at the moment of start. When the relay fails, it tries to start the compressor, a click is heard, the protection is triggered due to lack of starting, and the cycle is repeated again and again.
This operating mode is extremely dangerous for compressoras it leads to rapid overheating of the motor windings. The sound in this case is often described as a series of rapid clicks separated by seconds or minutes. This is a classic symptom of a faulty starting device or low voltage in the network, which does not allow the engine to gain the required speed.
Sometimes the reason lies not in the relay itself, but in burnt contacts or broken insulation of the wiring going to the motor. In this case, the clicking sound may be accompanied by a slight burning smell or sparking if the rear protective panel is removed. Diagnosis of this part requires caution, since work is carried out with high voltage.
Replacing a relay does not always require calling a technician if you have basic electrical skills. However, it is important to choose the right analogue, since starting devices differ in engine type and power. An incorrectly selected relay may not protect the motor from overload, which will lead to expensive repairs.
- ⚡ Frequent clicks without starting are a sign of a malfunction of the relay.
- 🔥 Heating of the relay body is a signal of overload or short circuit.
- 🔌 Contact oxidation - the cause of poor connection and sparking.
- 📉 Low voltage in the network - the engine cannot start.
How to check the starting relay?
Remove the relay from the compressor and shake it next to your ear. If a clear knocking sound of a dangling core is heard inside, then the device is faulty and requires replacement. You can also check the resistance of the windings with a multimeter.
Malfunctions of the compressor and motor
The compressor is the heart of the refrigerator, and any extraneous sounds emanating from it require close attention. If you hear a click, followed by a hum that lasts a few seconds, and then a stop click, this may indicate that the engine is running "on the edge" of its capabilities. In such a situation, the motor tries to start, but a mechanical obstacle prevents it from turning. jamming of the piston group or starting the engine “on the edge” of its capabilities. In such a situation, the engine tries to start, but a mechanical obstacle prevents it from cranking.
Another reason may be wear of the internal bearings or bushings of the engine shaft. Over time, the lubricant dries out, and the metal parts begin to rub against each other, producing characteristic knocks and clicks when the load changes. Unlike the sounds of a thermostat, these noises are often accompanied by strong vibration of the unit housing.
In some cases, clicks inside the compressor can be caused by water hammer if liquid (freon in the liquid phase) instead of gas has entered the system. This often happens after unqualified repairs or refueling. The liquid is incompressible, and as the piston moves, a sharp shock occurs, which is heard as a loud click or knock.
| Type of sound | Probable cause | Danger | Actions |
|---|---|---|---|
| Single click at start | Normal (relay operation) | No | Observe |
| Series of clicks, no cold | Starter malfunction | High | Disconnect, replace relay |
| Clicks inside the motor | Wear of mechanics | Critical | Call a technician |
| Crackling and humming | Destruction of bearings | Average | Plan repairs |
Compressor diagnostics often require professional equipment, such as pressure gauges to check system pressure and testers to measure starting current. Independent intervention in a sealed circuit without a license and tools is prohibited and can be dangerous.
The influence of thermal expansion of materials
Do not forget about the physical properties of the materials from which the refrigerator is made. Plastic, metal, and insulating foam expand when heated and contract when cooled. This process, called thermal expansionis especially noticeable in new refrigerators or after a long defrost, when the unit reaches operating temperature.
Internal shelves, drawers and plastic panels can make sounds similar to clicks or crackles as they change their geometry under exposure to cold. Most often, such sounds are heard inside the refrigerator compartment and do not have a clear periodicity, depending on the operating cycle of the motor. They can occur spontaneously at any time of the day.
Models with large freezer compartments, where the temperature difference is most significant, are especially susceptible to this phenomenon. Over time, as materials become accustomed to the cycles of freezing and defrosting, the intensity of such sounds usually decreases, although they may not completely disappear. This is a purely cosmetic defect in perception that does not affect functionality.
- 🌡️ Sounds when the temperature rises after switching on.
- 🧊 Plastic cracking inside the chamber when freezing.
- 🏗️ Expansion of the metal case at the back.
- 📦 Movement of glass shelves in the grooves.
To make sure that the sound source is in the expansion, you can lightly press your hand on the plastic panel or shelf at the moment the sound occurs. If the nature of the noise changes or it stops, it means that the problem is vibration or friction of plastic parts against each other.
Do-it-yourself diagnostics: step-by-step plan
Before calling the service center, it is worth conducting independent diagnostics, which will help the technician more accurately determine the malfunction over the phone or allow you to fix the problem yourself. The first step is to carefully listen to the unit to localize the sound source. Place your ear against the back wall, then to the sides and inner chamber.
Next, you need to track the frequency of clicks. Note the time between sounds: does it coincide with the cycles of turning the motor on and off? Does the refrigerator operate normally and does it cool food? Answers to these questions will narrow down the search.
☑️ Diagnosis of refrigerator noise
If you find that the clicks come from the start relay, and you have the skills to work with the tool, you can try removing the back cover (required disconnecting the refrigerator from the network!) and visually inspect the relay. The presence of soot, melting or a characteristic burning smell will indicate the need to replace the part.
It is also important to check the installation level of the refrigerator. If the unit is not level, vibration from the compressor can be transmitted to the floor or walls, causing resonance and additional clicks from the body touching the furniture. Adjusting the legs can completely solve the problem.
⚠️ Attention: Any work related to opening the electrical part or breaking the tightness of the circuit should only be carried out with the device completely disconnected from the network.
When you need to call a specialist
Despite the possibility of self-diagnosis, there are situations where professional intervention is indispensable. If after replacing the start relay the situation has not changed, or if the clicks are accompanied by a complete lack of cold, the problem may lie deeper - in the compressor itself or the refrigerant circulation system.
Also, the help of a technician is necessary if you notice an oil leak under the refrigerator or feel a specific smell of burnt insulation that does not disappear after airing. Attempts at further operation in such conditions can lead to a fire or complete failure of the equipment without the possibility of recovery.
Modern refrigerators are often equipped with electronic control modules that can display errors on the display or blink indicators. These codes can only be deciphered and software diagnostics can be carried out using special equipment available from authorized service centers.
Prevention and operating rules
To minimize the risk of malfunctions accompanied by extraneous sounds, it is important to follow the operating rules. Regular defrosting (for models Drop and static) prevents the formation of an ice coat that can block the fan or dampers, causing mechanical knocking.
Do not overload the shelves and make sure that the products do not touch the back wall of the chamber where the evaporator is located. This not only disrupts air circulation, but can also lead to freezing of food, the release of which will be accompanied by loud clicks and crackles.
Ensure the refrigerator has adequate ventilation. The gap between the rear wall of the unit and the furniture should be at least 5-7 cm. This will allow the condenser to efficiently transfer heat, reducing the load on the compressor and reducing the likelihood of it operating in emergency modes.
Why does the refrigerator click but does not freeze?
This is a classic sign of a malfunction of the start relay or the compressor itself. The relay tries to start the motor (click), but due to a breakdown of the windings or mechanical wedge, the start does not occur, and the protection system opens the circuit. The relay needs to be replaced or the compressor repaired.
Is it normal for the refrigerator to click when the lights are turned off?
Yes, this is normal. When there is a power surge or a power outage, the thermostat and protective relays may trip, making clicking noises. Also, when the power supply is restored, the unit will try to start, which is also accompanied by a sound.
Can a new refrigerator click?
Yes, new refrigerators often make sounds of thermal expansion of plastic and metal until they reach operating temperature conditions. There may also be a sound of refrigerant flowing, which is sometimes perceived as gurgling or light clicks.
How often should the start relay operate?
In normal mode, the refrigerator turns on and off approximately 4-8 times a day, depending on the load and room temperature. Accordingly, you should hear 4-8 paired clicks (on and off) within 24 hours.
Is the clicking sound dangerous for products?
The sound itself is not dangerous. The reason that causes it is dangerous. If clicking sounds mean that the refrigerator is not working (not freezing), then the food may spoil. If these are the sounds of expansion or operation of the thermostat during normal cold, then nothing threatens the food.