The situation when the refrigerator cracks during operationcan unsettle any owner of household appliances. In the silence of an apartment at night or in the calm atmosphere of a living room, extraneous sounds are perceived especially acutely, causing concern for the safety of food and the serviceability of an expensive unit. Often, users immediately begin to panic, assuming a serious motor breakdown or a freon leak, but the range of reasons can be much wider and are not always associated with critical malfunctions.
Understanding the nature of the sound is the first and most important step to solving the problem. Refrigeration Equipment is a complex a mechanism where electrical, mechanical and thermodynamic processes interact. Some sounds are completely normal for certain stages of the cooling cycle, while others signal that the system requires immediate Maintenance or adjustment.
In this article we will look in detail at why characteristic clicks and crackles occur, how distinguish normal operation from an emergency situation and what actions need to be taken first. You will learn how to carry out initial diagnostics yourself so as not to overpay for calling a technician in cases where the problem can be solved on your own in a few minutes.
Natural sounds: the physics of the process has not been canceled
Before sounding the alarm, it is necessary to eliminate the so-called “working” sounds that arise due to the physical properties of materials and refrigerant. When compressor starts or stops, a sudden change in pressure occurs in the system. Gaseous freon, passing through the capillary tube and evaporator, can emit sounds resembling gurgling or slight hissing, which is often mistaken for crackling.
Especially often, owners of new equipment encounter loud clicks in the first days of operation. This is due to the fact that plastic elements the internal camera and the outer casing have not yet “got used to it”. When the temperature changes, the plastic contracts and expands, producing a characteristic ringing crackling sound. This process is called temperature deformation and is absolutely normal for any polymer material.
- 🔊 Sharp clicks when the motor is turned on or off indicate the operation of the start relay.
- 🌡️ Cracking during the active cooling phase is often caused by the narrowing of the plastic panels inside chambers.
- 💨 The noise of the circulating refrigerant may resemble water pouring or a slight crackling.
It is important to note that if crackling in the refrigerator occurs cyclically and coincides with moments of changing operating modes, most likely your equipment is working properly. Modern models, especially those equipped with the No Frost system, have a more complex system of air ducts and fans, which creates an additional acoustic background that you need to get used to.
⚠️ Attention: If you have just installed a new unit, let it “settle” for several hours before turning it on. A sudden start after transportation can cause increased vibration and noise due to unsettled oil in the compressor.
Many users are not aware that even the location of products can affect acoustics. Glass shelves that fit tightly to plastic guides can produce a ringing sound when vibrating, which can easily be mistaken for a mechanism failure. It is enough just to move the shelf a little or place a silicone gasket under it to eliminate noise.
Installation problems: vibration and distortions
One of the most banal, but common reasons why The refrigerator is crackling and hummingis incorrect installation. The equipment must stand strictly horizontally. If the unit is skewed, the vibration from the operating compressor is transmitted unevenly to the housing, causing metal parts and plastic panels to rattle. As a result, the illusion of a constant crackling sound is created inside the mechanism.
Checking the level is the first thing a master or owner should do when complaints about noise arise. The feet at the bottom of the body are used for adjustment. They must be unscrewed or tightened until the bubble level shows the perfect horizontal line. At the same time, it is important that the equipment does not wobble from side to side.
The second important aspect is the distance to the walls and furniture. Rear grille (the capacitor) should not touch the wall, and the side walls should not rub against the cabinets. The minimum distance to the wall should be 5-10 cm for free air circulation. If the refrigerator is in a niche, vibration can be transmitted to the walls of the cabinet, amplifying the sound significantly.
Often a cracking sound occurs due to the fact that the vibrating body touches some foreign objects. It could be a forgotten bottle behind a back wall, a drooping curtain, or even a power cord that's stuck against a hot condenser tube. A careful inspection of the space around the unit helps to quickly identify and eliminate the source of the sound.
- 📏 Check the gap between the rear wall of the refrigerator and the wall of the room.
- 🔧 Adjust the front support legs to eliminate distortion of the case.
- 🧹 Remove all foreign objects located in the immediate vicinity equipment.
Malfunctions of the defrost system (for No Frost models)
In refrigerators with the system No Frost the process of ice formation and its subsequent removal is automated. A defrosting system is responsible for this, including a heating element (heater), timer and thermostat. If you hear periodic cracking sounds reminiscent of the sound of ice breaking, or clicks accompanied by a humming sound, the problem may lie here.
When ice freezes too much on the evaporator (due to faulty sensors or infrequent defrosting), the fan driving air can touch the ice crust with its blades. This causes a characteristic crackling and grinding sound. In such a situation, air circulation is disrupted, and the refrigerator stops freezing normally, although the compressor can work non-stop.
Another reason for the crackling sound in this system is a malfunction of the air supply damper. The mechanical damper that regulates the flow of cold air into the refrigerator compartment may become jammed due to ice or a breakdown of the drive. When you try to open or close it, the motor emits a series of quick clicks or hums.
| Symptom | Probable cause | Character of sound |
|---|---|---|
| Periodic crackling every 8-12 hours | Operation of the defrosting heating element (expansion of metal) | Quiet metal crackling |
| Loud rattling inside the chamber | The fan blades touch the ice | Loud crackling sound, turning into hum |
| Series of clicks without cooling | Attempt to open a jammed damper | Rhythmic clicks of the damper motor |
| Crackling sound when the compressor is turned off | Thermal compression of plastic air ducts | A loud, single crackling sound |
If the problem is related to freezing, completely defrosting the refrigerator often helps. It is necessary to turn off the equipment from the network, open the doors and leave it for at least 24 hours. This will allow the ice to completely melt and free up the fan. If, after turning on, the sound repeats after a few days, it means that one of the elements of the defrosting system is faulty.
Start relay and electrical part
If The refrigerator clicks and does not turn on or makes a series of frequent clicks before starting the motor, most likely the problem lies in the start relay. This small element is responsible for supplying voltage to the compressor windings at the moment of start. When the relay wears out or fails, it cannot maintain contact, constantly opening the circuit.
The sound of a faulty relay is often described as a loud, sharp clicking sound that repeats every few seconds or minutes. The motor tries to start, hums, but the relay opens the circuit, and the process repeats again. Long-term operation in this mode is dangerous for the compressorcompressor itself, since it does not have time to start, but is under load, which can lead to its burnout.
Replacing the start relay is one of the simplest and most inexpensive repair procedures. The technician removes the protective casing at the back of the unit, removes the old relay and installs a new one that matches the compressor model. It is important to use original spare parts or high-quality analogues, as cheap relays can quickly fail.
⚠️ Attention: If you hear frequent clicks of the relay, immediately unplug the refrigerator. Attempts to force start can lead to a fire hazard or permanent engine failure.
Poor contact in the wiring or terminal block can also be a source of electrical noise. Oxidation of contacts or loosening of screws leads to micro-discharges that sound like a quiet crackling sound. This requires checking the electrical circuit by a specialist using a multimeter.
Compressor: when replacement is needed
The most unpleasant scenario is a malfunction of the very heart of the refrigerator, compressor. If the unit makes a loud metallic knocking noise, clanging noise, or continuous cracking noise that gets worse over time, this may indicate wear and tear on the internal mechanical parts of the motor. Pistons may knock on the cylinder walls, and valves may not work correctly.
Diagnostics of a compressor requires a professional approach. The technician listens to the operation of the motor, measures the pressure in the system and the current strength. If mechanical destruction of internal components is confirmed, compressor repair usually impractical - it is replaced with a new one. This procedure is complex and requires evacuation of the system and refilling with freon.
Sometimes the crackling does not come from the motor itself, but from the vibration of the tubes approaching it. The copper tubes may be in contact with each other or with the housing wall. The vibration of a running engine causes them to rub, creating a metallic ringing sound. In this case, it is enough to carefully bend the tubes or install rubber dampers.
- 🔨 A metallic clang inside the motor indicates destruction of the piston group.
- 📉 A drop in cooling performance along with noise indicates a loss of compression.
- 🔥 Overheating of the motor housing (more than 90°C) in combination with a crackling sound is a sign of interturn shorting.
It is worth noting that inverter compressors are quieter than traditional ones, but if they break down, the sounds can be more high-frequency and unpleasant. Replacing an inverter motor is an expensive procedure that also requires replacing the control electronics in some models.
Compressor service life
Modern compressors are designed for 10-15 years of active operation. However, the service life strongly depends on the stability of the voltage in the network and operating conditions (room temperature, frequency of door openings).
Cooling fan: cleaning and lubrication
In No Frost systems and some models with a drip system, fans are responsible for air circulation. Over time, dust, hairs and greasy film accumulate on the fan blades and axis. This leads to unbalanced rotation and the appearance of noise, which can vary from a hum to a rhythmic crackling.
If the fan is “tired” or the grease has dried out in its bearing, it begins to emit a piercing squeak or crackle when rotating. Sometimes the blades may touch ice or a foreign object that has gotten into the air duct. In such cases eliminating noise the process involves disassembling the rear panel of the freezer or refrigerator compartment.
The process of servicing the fan includes removing it, cleaning it from dirt and lubricating the bearing with special oil. If the fan hub has exhausted its service life and has play, it is more advisable to replace the entire assembly. A new fan is inexpensive and can be installed in 15-20 minutes.
☑️ Fan diagnostics
Sound localization helps to understand which node requires attention. If a cracking sound is heard in the upper part, most likely the problem is in the upper fan.
Frequently asked questions (FAQ)
Why does a new refrigerator crack in the first days?
This is a normal process of adapting materials. The plastic of the internal chambers and the outer coating expand and contract during the first cooling and heating cycles, making sounds. Usually, after 3-5 days of operation, the noise completely disappears.
Is it dangerous if the refrigerator clicks but freezes?
If the clicks are rare (once every hour or two) and coincide with the motor turning on/off, this is the normal operation of the relay. If the clicks are frequent and accompanied by a buzzing sound that ends abruptly, this is a sign of a malfunction of the starting device, which is dangerous due to overheating of the compressor.
Is it possible to continue using the refrigerator if it is cracking?
Depends on the nature of the sound. If this is the natural expansion of plastic or the quiet noise of the refrigerant, it’s possible. If the sound is loud, metallic or accompanied by a lack of cold, it is better to stop operation before the technician arrives, so as not to aggravate the breakdown.
How to distinguish the sound of a compressor from the sound of a fan?
The compressor usually produces a low-frequency hum or rhythmic beats (located at the bottom at the back). The fan produces a higher frequency noise, whistling or crackling of the blades (located inside the chambers, behind the back wall). To check, you can carefully open the door - in many models, the fan stops and the sound disappears.
Do you need to call a technician if the refrigerator is just humming loudly?
First, try to carry out self-diagnosis: check the installation level, move the equipment away from the wall, make sure that it does not touch the furniture. If these measures did not help and the noise level seems abnormally high to you for your model, consulting a specialist will not be superfluous.