Suddenly appearing extraneous sound in the operation of household appliances always causes alarm, especially when it comes to refrigerator that works 24 hours a day. If your unit begins to hum louder than usual, make cracking noises, clicks or whistles, this is a sure sign that there is a failure in the system or one of the parts has worn out. It is impossible to ignore anomalies in acoustics anomalies in acoustics
The first thing to do when you hear an unusual hum is to carry out an initial diagnosis. Often the problem lies not in a breakdown of the electronics or motor, but in trivial things that can be fixed in a few minutes without calling a repairman. However, there are a number of situations when do-it-yourself repair is impossible and requires the intervention of professionals with specialized equipment.
In this article we will look in detail at why refrigerator makes different sounds, how to distinguish a normal working hum from a sign of a malfunction and what steps to take to restore silence. Understanding the nature of sound is the key to successfully solving the problem.
Primary diagnosis: external factors and installation
Before disassembling the unit or panicking, it is necessary to exclude external causes, which often become the source of noise. In most cases, casing vibration is transmitted to the floor or nearby objects, creating a resonance, which is perceived as a malfunction of the equipment.
Check whether the refrigerator is level. If the legs are not adjusted correctly, the body may warp, causing internal components to shift and increasing the hum. Also pay attention to the distance to the walls and furniture: too tight a fit of the rear grille to the wall disrupts air circulation, causing the compressor to work with increased load.
⚠️ Attention: If you have recently transported the refrigerator, do not turn it on immediately. The oil in the compressor must drain back into the crankcase, otherwise the engine may fail during startup. hydraulic hammer and motor failure upon startup.
Often the source of rattling is foreign objects caught behind the equipment or lying on the top panel. Even a small can or bottle placed on top can resonate with the frequency of the engine.
Make sure that the floor under the equipment is level and strong. Linoleum or tiles can increase vibration, so it is often recommended to place special vibration-damping pads or pieces of dense rubber under the legs.
Analysis of the nature of the sound: buzzing, crackling and whistling
The nature of the emitted sound directly indicates to the unit where the breakdown occurred. Experienced audio technicians can determine the malfunction with high accuracy without disassembling the unit. Let's look at the main types of noise.
If you hear intermittent crackling noise or clicks, especially when turning on or off, this often indicates thermal expansion of materials. The plastic and metal inside the chamber change volume when the temperature changes, which is normal for many models, especially with the system No Frost. However, if the crackling noise becomes constant and loud, there may be a problem with the thermostat or start relay.
Whistling sound usually indicates problems with refrigerant circulation or fan operation. In systems with no-frost, the fan may touch the ice crust if the defrosting system does not work correctly. A humming sound that turns into a whine often indicates that the compressor is working at its limit.
The following table helps classify the sounds and their probable causes:
| Sound type | Probable reason | Urgency of repair |
|---|---|---|
| Monotonous hum | Normal operation of the compressor or poor installation | Low |
| Loud clicks | Malfunction of the start relay or thermostat | Medium |
| Whistling or hissing | Freon leak or problem with the fan | High |
| Gurgling | Movement of refrigerant through the pipes (normal) | Not required |
| Metal knocking | Internal failure of the compressor | Critical |
Problems with the compressor and start relay
The compressor is the “heart” of the refrigerator, and it is it that creates the main noise during operation. If the unit begins to hum many times louder than usual, and this hum is accompanied by vibration of the housing, the internal shock absorbers of the engine have probably worn out or the piston group has worn out. A frequent cause of loud clicks and subsequent silence (when the refrigerator does not turn on) is the failure of the start relay. This small element is responsible for starting the engine. When it breaks down, the compressor tries to start, makes a loud click or hum, but immediately stalls because it cannot gain the required speed. piston group.
A common cause of loud clicks and subsequent silence (when the refrigerator does not turn on) is the failure of the start relay. This small element is responsible for starting the engine. When it breaks down, the compressor tries to start, makes a loud click or hum, but immediately stalls because it cannot gain the required speed.
Replacing the start relay is a procedure that can be done with your own hands if you know how to use tools. It is necessary:
- 🔌 Disconnect the refrigerator from the power supply and remove the back panel.
- 🔧 Remove the faulty relay from the compressor contacts (usually it is simply put on).
- 🆕 Install a new element, strictly observing the orientation (top-bottom indicated on case).
- ✅ Check the operation of the unit in test mode.
If the compressor itself makes a metallic clang or knock, this indicates destruction of the internal valves or bearings. In this case motor repair is not economically feasible, its complete replacement is required, which is a complex procedure that requires evacuation of the system and refilling with freon.
⚠️ Attention: Replacing the compressor yourself requires special equipment (vacuum pump, manometric station). Without these tools, it is impossible to do the job efficiently.
Faults in the No Frost system and fan
In modern models with the system No Frost fans are responsible for circulating cold air. Over time, their bearings wear out, resulting in a whining, buzzing, or crackling sound. Also, the fan blades may touch ice formed due to a malfunction in the defrost system.
If you hear noise coming from the top of the freezer or from a special compartment, most likely the problem is in the fan. Some models may have two of them: one for the freezer, the other for the refrigerator compartment. Localization of sound helps to understand which particular unit requires attention.
To fix the problem, defrosting the refrigerator during the day is often required. If after complete defrosting and drying the noise disappeared, but returned after a few days, it means that the timer is faulty, and ice is again growing on the blades. the time of year the air in the room may be drier, or vice versa, it may be too humid if you dry your clothes nearby. The temperature in an unheated kitchen also affects. If the refrigerator is located against an external wall, the temperature difference contributes to the faster formation of condensation and ice inside the air ducts. defrost heating element or a timer, and ice builds up on the blades again.
Why does the fan make noise only in winter?
During the cold season, the air in the room may be drier, or, conversely, too humid if you dry clothes nearby. The temperature in an unheated kitchen also affects. If your refrigerator is placed against an outside wall, the temperature difference causes condensation and ice to form inside the ducts more quickly.
Replacing a fan is a simple procedure. After turning off the power, the back wall inside the chamber is removed, the terminal is disconnected and the fan itself is removed. It is important to choose an analogue with the same geometric dimensions and supply voltage.
Refrigerant leakage and problems with capillaries
One of the most alarming sounds is a hissing or whistling sound, accompanied by a complete absence of cold. This is a sure sign of circuit depressurization and leakage freon. The refrigerant, escaping under pressure through a microcrack, creates a characteristic whistling sound.
Sometimes users hear gurgling or pouring of liquid. In most cases, this is normal: this is how the refrigerant behaves as it passes through the capillary tube and the evaporator. However, if the gurgling becomes very loud and constant, it is possible that air or moisture has entered the system, which requires evacuation and refilling.
When freon leaks, the following symptoms are observed:
- ❄️ Products have stopped freezing or cooling.
- 🔥 Condenser the grille at the back remains cold (normally it should be warm).
- 🔊 The appearance of a hissing sound in the area of the joints of the tubes or evaporator.
Freon leakage is not eliminated simply by adding gas. It is necessary to find the place of damage, solder it and only then charge the system. Using a refrigerator with a leak can lead to the compressor burning out due to lack of cooling of the windings.
When you need to call a technician: checklist
Not all problems can be solved on your own. There are situations where the intervention of an unqualified user will only aggravate the breakdown and lead to higher repair costs. It is important to soberly assess your strengths and the availability of tools.
If you have checked the installation, defrosted the unit and checked the starting relay, but the noise has not disappeared, most likely the problem is deeper. This is especially true in cases where it is necessary to open a sealed circuit or replace the compressor.
☑️ Do you need a technician?
It is also worth contacting the service center if The equipment is under warranty. Self-repair in this case will lead to loss of the manufacturer's warranty.
Noise prevention and equipment care
For the refrigerator to work quietly and for a long time, it must be properly cared for. Regular defrosting (for drip systems) and cleaning the drainage hole will prevent the formation of excess moisture and ice, which can cause fan noise.
Keep the rear condenser grill clean. Dust and pet hair accumulate on the fins and impair heat transfer. The compressor has to work longer and harder to maintain the temperature, which increases wear and noise.
Regularly check the condition of the rubber seals on the doors. If they do not fit tightly, warm air enters the chamber, forcing the unit to work in increased mode. The seals should be wiped with a soft cloth soaked in soapy water to remove grease and dirt.
⚠️ Attention: The design and materials of refrigerators from different brands may vary. Always check the official instructions for your model before disassembling the components.
Frequently asked questions (FAQ)
Is it normal for a new refrigerator to buzz loudly in the first days?
Yes, this is normal. New compressors require a “break-in” period when the parts get used to each other. Also, in the first days of operation, the equipment may make noise due to the fact that it reaches the specified temperature from scratch. Usually, after 3-5 days, the noise level decreases to operating level.
Why does the refrigerator hum only at night?
During the day, extraneous household noises mask the operation of the equipment. At night, in silence, even a normal working hum becomes audible. If the sound has not changed in character (no knocking or howling), but has simply become more noticeable, this is not a breakdown.
Is it possible to lubricate a compressor if it squeaks?
No, modern compressors are sealed units. You cannot add oil or grease to them. A creaking indicates mechanical wear of the bearings or piston group, which requires replacement of the entire unit.
Is it dangerous to continue using a noisy refrigerator?
If the noise is caused by vibration or a fan, it is temporarily possible. But if the compressor is humming or there is a freon leak, further operation will lead to motor failure and food spoilage. It is better to diagnose the problem as soon as possible.