The silence in the apartment at night is often broken by the sounds of operating household appliances, and the loudest participant in this process is usually the refrigerator. Many owners notice that it is at night that the unit begins to make loud clicks, crackles or hums, causing concern for the safety of the products and the serviceability of the device. During the day, these sounds are often lost in the general household noise, but late at night they become clearly audible and can interfere with sleep, making you think about the reasons for what is happening.
In most cases, periodic clicking is an absolutely normal operating process associated with the physics of the cooling system. However, there are situations when the frequency, volume or nature of the sound indicate an incipient malfunction that requires specialist intervention or adjustment. Understanding the differences between normal operation and emergency mode will help you avoid unnecessary panic or, conversely, react in time to a serious breakdown.
Natural physical processes and compressor operation
The main source of sound in any refrigerator is compressor, which operates cyclically, turning on and off to maintain the set temperature. When the engine starts or stops, the contacts of the starting relay open in the electrical circuit, which is inevitably accompanied by a characteristic click. This sound can be quite loud, especially in models with an open type of compressor or if there is resonance in the housing.
In addition, refrigerant circulates inside the system, which, when transitioning from liquid to gaseous state and back, makes gurgling sounds and slight crackling sounds. At night, when the background noise of the city subsides, these acoustic effects become more noticeable to human hearing. If the clicks occur with a certain frequency, coinciding with the cycles of turning on the motor, then, most likely, everything is in order with your refrigerator Everything is fine.
It is important to consider that modern models are equipped with systems that have their own sound characteristics. In such units, clicks can be produced by dampers that regulate cold air flows or by the evaporator defrost mechanism. These sounds do not indicate a breakdown, but are part of the standard operating algorithm of the climate control inside the chamber. No Frost, which have their own sound characteristics. In such units, clicks can be produced by dampers that regulate cold air flows or by the evaporator defrost mechanism. These sounds do not indicate a breakdown, but are part of the standard operating algorithm of the climate control inside the camera.
The normal frequency of turning on the compressor is considered to be 2-4 times per hour, and the duration of the motor operation should significantly exceed the idle time. If you hear clicks at these moments, then the physics of the process is not broken. However, if the motor tries to start, clicks, but does not start, or the clicks come in series without pauses, this is a cause for concern.
Problems with the thermostat and its replacement
One of the common reasons Loud clicks indicate a malfunction or operating features thermostat (thermostat). This small device monitors the temperature inside the chambers and sends a signal to turn the compressor on or off. In older models of mechanical thermostats, the contacts open with an audible click, which is transmitted through the body. Over time, the mechanism may wear out, and the clicks will become louder or more frequent.
If the thermostat is faulty, it can send false signals, causing the compressor to jerk or turn on too often. This not only creates discomfort due to noise, but also leads to increased energy consumption and wear on the motor. In electronic models, the role of a thermostat is performed by sensors that operate silently, so loud clicks in them are often associated with other components.
For diagnostics, you need to listen to where exactly the sound is coming from. If the clicking sound is heard at the top of the refrigerator compartment (where the thermostat is usually located) and is immediately followed by an attempt to start the motor, the problem is likely in the control circuit. Replacing a thermostat is a simple procedure, but it requires precision when connecting the contacts.
How to check the thermostat yourself?
To check a mechanical thermostat, you can carefully remove it and close the contacts directly. If the refrigerator runs continuously, then the problem is in the sensor. Be careful with electricity!
Malfunctions of the starting relay and electrics
The most alarming signal is a series of frequent clicks, following each other at intervals of several seconds, during which the compressor hums, but does not start. This picture indicates problems with starting relay or the electric motor itself. The relay is responsible for supplying a starting pulse to the motor winding, and if it is faulty, the contacts will constantly open and close, making a cracking sound.
Inside the starting relay there is a coil and contacts, which over time can burn or stick. In this case, the device cannot keep the circuit closed, and the protection turns off the power, after which the cycle repeats. Operating the refrigerator in this mode is strictly prohibited, as this can lead to burnout of the compressor winding.
Also, the source of electrical clicks can be poor contact in the wiring or at the connection terminals. Oxidation of contacts leads to sparking, which is heard as a crackling sound. This creates a risk of short circuit and fire, so if you suspect the electrical nature of the sound, you must immediately turn off the power to the device and call a specialist.
To replace the relay, it is usually enough to remove the back cover at the bottom of the refrigerator, disconnect the connector and replace the part with a new one. It is important to select a relay with exactly the same characteristics as the original, otherwise the compressor may not start or burn out.
☑️ Diagnostics of the starting relay
The influence of voltage drops in the network
The quality of electricity in our homes often leaves much to be desired, and refrigerators are very sensitive k voltage drops. If surges occur in the network, the device’s automatic protection may be triggered, making clicking noises when the circuit is opened. This is a protective reaction that prevents expensive equipment from breaking down.
At night, the load on the power grid may change: neighbors turn off powerful appliances, or, conversely, street lights and pumps turn on. These changes can cause voltage fluctuations to which your refrigerator responds. If the clicks correlate with the blinking of the lights in the apartment or occur at a certain time of the day, you should think about installing a stabilizer.
The lack of a stable voltage leads to the fact that the compressor does not have enough power to start, and the protection relay constantly cycles the process. This accelerates wear and tear on all electrical components. In regions with an unstable power grid, the use of voltage stabilizer is a prerequisite for the long life of household appliances.
Diagnostic table refrigerator sounds
To make it easier for you to determine the nature of the malfunction, we have systematized the main types of sounds and their probable causes in the table below. This will help narrow down the search for the problem before calling a specialist.
| Sound type | Probable cause | Degree of danger | Actions |
|---|---|---|---|
| Single click when on/off | Operation of the thermostat or relay | Safe (Normal) | Observation |
| Series of frequent clicks, the motor does not start | Malfunction of the starting relay | High | Replacement of the relay |
| Crackling and clicking inside the camera | Plastic cracks due to temperature changes | Safe | Ignore |
| Loud clicking and buzzing | Attempt to start the compressor | Average | Checking voltage |
| Regular clicks every 10-15 minutes | Short operating cycle (problems with freon) | Average | Call a technician |
Deformation of materials and thermal expansion
Often users are frightened by the sounds emanating from the internal walls of the refrigerator, especially after loading new products or defrosting. The plastic from which the interior panels and drawers are made tends to expand when heated and contract when cooled. This process is called temperature deformation.
When you put warm food in the chamber or simply close the door, the temperature inside changes sharply. Plastic parts begin to “play”, making sounds very similar to gunshots or loud clicks. This is an absolutely natural physical process that does not pose any threat to technology.
This is especially often observed in new refrigerators or in models with glossy plastic internal surfaces. Over time, the material “gets used” to the expansion-compression cycles, and the sounds become quieter, but may never completely disappear. The main difference between such sounds is that they are not tied to the operation of the motor and can occur chaotically.
When it is necessary to call a technician
Despite the fact that many sounds are normal, there are situations when you cannot hesitate. If you notice that the refrigerator is clicking but not cooling, or the food in the chamber has begun to deteriorate, this is a direct signal of a serious breakdown. Also, the smell of burning or burning plastic accompanying the clicks should cause alarm.
⚠️ Attention: If, when you try to start the compressor, the automatic switch (plugs) in the apartment panel is knocked out, immediately stop trying to turn it on and contact an electrician or refrigerator repairman.
Independent repair of complex components, such as a compressor or freon circulation system, without special equipment and skills is impossible and dangerous. An attempt to repair sealed circuit your own hands is guaranteed to lead to the final breakdown of the unit. In such cases, professional diagnostics is the only correct solution.
The technician will be able to accurately determine whether the problem lies in the electrical part, refrigerant leakage, or mechanical wear of components. Calling a specialist in a timely manner often allows for inexpensive repairs, while delaying the problem leads to replacing an expensive compressor or purchasing a new refrigerator.
How much does diagnostics cost?
The cost of diagnostics usually varies and depends on the policy of the service center. Often, during subsequent repairs, the technician’s visit is paid at a discount or free of charge.
Prevention and proper care of equipment
To minimize noise effects and extend the life of the refrigerator, it is important to operate it correctly. Regular defrosting (for models with a drip system) helps to avoid unnecessary load on the compressor. Cleaning the condenser at the back of the refrigerator from dust also improves heat transfer and reduces operating noise.
Check the installation of the refrigerator: it must be positioned strictly horizontally. If the feet are not adjusted correctly, the cabinet may vibrate and resonate, amplifying any internal clicking noises. Using a level during installation will help eliminate this factor. Also make sure that the refrigerator does not touch walls or furniture, which can also create a drum effect.
⚠️ Attention: Do not place the refrigerator close to the wall. For normal air circulation around the condenser, it is necessary to leave a gap of at least 5-10 cm, otherwise the motor will overheat and run louder.
Maintaining temperature conditions and not overloading the chambers with products will help the compressor work at an optimal rhythm. The less extreme loads the equipment experiences, the quieter and more stable it operates. Remember that ideal silent refrigerators do not exist, but proper care makes their operation as comfortable as possible for hearing.
Frequently asked questions (FAQ)
Is it normal that the refrigerator clicks immediately after being plugged in?
Yes, this is normal. When turned on for the first time or after a long period of inactivity, the compressor attempts to start, which is accompanied by a click from the relay. If after this it begins to hum and cool, everything is in order.
Why does the old refrigerator click louder than the new one?
Over time, the compressor bearings wear out, the fastenings become loose, and the contacts in the electrical circuit oxidize. All this leads to increased vibration and louder sounds when switching operating modes.
Can a refrigerator click if there is no food in it?
Yes, it can. An empty refrigerator even turns on and off more often, as the air cools and heats up faster than the food. This leads to more frequent clicks of the thermostat.
Is cracking ice in the freezer dangerous?
No, it is not dangerous. In No Frost systems, the ice on the evaporator is periodically defrosted by the heater, and the melting ice may crack or click. This is a normal defrosting process.