The appearance of an extraneous hum from a DEXP refrigerator is a signal that cannot be ignored, since it can indicate both minor violations in the installation and serious damage to internal components. Refrigeration equipment This brand, like any other equipment, can produce sounds of varying intensity during operation, but it is important to be able to distinguish normal operating noise from signs of a malfunction. If your unit begins to hum louder than usual or emits unusual vibrations, this requires immediate attention and diagnostics.
In most cases, the problem lies in violation of installation rules or natural wear of parts, but ignoring strong hum can lead to failure of an expensive compressor. Users often encounter a situation where the equipment works properly, but the background sound becomes annoying and interferes with a comfortable life. Understanding the physics of the processes inside refrigerator compartment will help you quickly identify the source of the problem and decide whether to call a technician or repair it yourself.
In this article we will analyze in detail all possible causes of noise, from simple installation errors to complex technical ones faults. Diagnostics must be carried out sequentially in order to eliminate false conclusions and not spend extra money on replacing serviceable parts. You will learn how to correctly assess the condition of the equipment and when exactly professional intervention is required.
Normal operating noise and features of the compressor
Modern DEXP refrigerators are equipped with compressors that inevitably emit sound during the process of compressing the refrigerant. This is a physical feature of the engine, and completely silent models do not exist. A smooth, monotonous low-frequency hum that is heard only in silence or when in close proximity to the unit is considered normal. If the sound is uniform and is not accompanied by jerking or knocking, then, most likely, compressor functions normally.
The intensity of the sound may depend on the operating mode: at the moment of switching on or during active freezing products, the noise level may temporarily increase. Inverter models are quieter, since they do not turn off completely, but only slow down, whereas conventional linear compressors either gain power or shut down. It is important to listen to the nature of the sound: if it is just a hum, then there is nothing to worry about.
⚠️ Attention: If the hum is accompanied by a metallic clang, whistle or sharp clicks, this is not the norm and requires stopping the device.
Frequently users they confuse normal operating sound with signs of breakdown, especially if the refrigerator was previously located in a different place or was less audible. Acoustic comfort depends on many factors, including the material of the kitchen walls and the presence of other noise sources. In some cases, simply rearranging the furniture or changing the operating mode of the equipment helps.
Installation problems and vibration of the case
One of the most common reasons for a buzzing DEXP refrigeratoris incorrect installation. If the unit is not level, its body can resonate with the vibrations of the running motor, increasing the sound significantly. Check the position of the equipment relative to the floor: it should be stable, not wobble or warp. Adjusting the height of the legs is the first thing to do before looking for more complex reasons.
Maintaining the distance to walls and furniture is also important. Rear grille The capacitor and the case itself should not touch walls, cabinets or other objects, as vibration is transmitted to them and causes hum. The minimum distance to the rear wall should be at least 5-7 cm, and to the side walls - about 5 cm. This is necessary not only to reduce noise, but also for normal air circulation.
☑️ Checking the installation of the refrigerator
Sometimes The source of vibration is objects located inside or on the refrigerator body. Dishes, bottles or decorative elements can rattle in time with the operation of the compressor, creating the illusion of a breakdown of the equipment itself. Remove all excess from the top panel and check the shelves inside - vibration often transmitted through glass or plastic.
No Frost system fan malfunctions
In models with the system No Frost the fan is responsible for circulating cold air. If your DEXP refrigerator begins to hum, hum, or whistle, especially after opening the door, the problem may lie in this unit. Over time, the fan bearings wear out, moisture or ice gets into them, which leads to the appearance of extraneous sounds. Fan may begin to crack or hum with increasing force.
Often the cause of the noise is ice freezing on the blades or in the area of the fan motor. This occurs due to a leak in the door seal or a malfunction of the defrost system. Ice interferes with the free rotation of the impeller, and it begins to touch the housing or ice crust, producing a characteristic cracking sound. In such cases, the unit must be defrosted within 24 hours. hum or crackling. In such cases, defrost the unit within 24 hours.
If the sound returns after complete defrosting, it means the problem is mechanical: the bearing is worn out or the fan axis is deformed. Replacing this part is a simple procedure, but requires partial disassembly of the freezer or refrigerator compartment. It is important to use original spare parts or high-quality ones analoguesthat are suitable in size and characteristics.
⚠️ Attention: Before replacing the fan, be sure to unplug the refrigerator and wait until it is completely defrosted to avoid a short circuit.
Deformation of heat exchangers and tubes
Heat exchangers (evaporator and condenser) are a system of tubes through which refrigerant circulates. When the DEXP refrigerator is running, these tubes can heat up and cool down, sometimes causing them to expand and contract. If the tubes are located too close to each other or touch the body, during thermal expansion they may touch, producing a ringing or metallic hum.
An incorrect position of the capillary tube can also cause noise. If it vibrates as the refrigerant passes through and touches other structural elements, an unpleasant high-frequency sound occurs. In some cases, gently bending the tubes with your hands (with the device turned off) helps to increase the gap. However, you need to act extremely carefully, since tubes it is easy to damage.
Can you bend the tubes yourself?
Independent change of the geometry of the tubes is possible only in visible places and with minimal effort. If the tube is located inside a foamed circuit or next to the compressor, it is better not to take risks - you can break the tightness of the system, which will lead to freon leakage and expensive repairs.
Often, deformation occurs during transportation or careless installation. If you notice that the condenser tubes on the rear wall are dented or touching the wall, try to carefully straighten them or move the unit away. Heat transfer There should not be any sound effects, and eliminating the contact usually solves the problem.
Wear of compressor shock absorbers
The compressor in the DEXP refrigerator is attached to the frame using special shock absorbers (springs or rubber bushings). Their task is to dampen vibrations that occur during engine operation. Over time, the rubber dries out, cracks or loses its elasticity, and the springs may weaken. As a result, the compressor begins to vibrate more strongly, transmitting vibrations to the housing, which causes rattling. a strong hum and rattling.
You can check the condition of the shock absorbers visually by looking at the bottom of the refrigerator (often you need to remove the back cover). If the rubber gaskets become crumbly or lose their shape, they must be replaced. This is an inexpensive part, but replacing it requires skills, since you need to lift or remove the motor-compressor.
Sometimes a temporary solution helps: place additional rubber gaskets under the compressor or use vibration-isolating material. However, this is only a measure to hold out until the purchase of new parts. Complete replacement of shock absorbers will restore silence and extend the life of the compressor, since vibration has a destructive effect on its internal components.
| Type of malfunction | Nature of sound | Probability of self-repair | Complexity |
|---|---|---|---|
| Incorrect installation | Vibration, case hum | High | Low |
| Fan wear | Whistling, crackling, howling | Average | Average |
| Deformation of tubes | Metallic ringing | Low (risk) | High |
| Wear of shock absorbers | Rattling, knocking | Average | Average |
When you need to call a specialist
There are situations when self-repair is not only ineffective, but also dangerous. If, after checking the installation, defrosting and visual inspection, DEXP refrigerator continues to hum, and the sound is accompanied by an increase in the temperature inside the chambers, this may indicate problems with the compressor or a refrigerant leak. In such cases, professional diagnostics using pressure gauges and leak detectors is required.
Also, the help of a specialist is needed if the hum appears suddenly and is accompanied by burning odors, sparking or knocking out plugs. These are signs of electrical problems that may cause a fire. Do not attempt to disassemble the electrical part or compressor unit without appropriate qualifications.
⚠️ Attention: Opening the sealed circuit of the refrigerator without a license and equipment is prohibited and leads to final breakdown of the unit.
The technician will be able to accurately determine whether the hum is a sign of imminent compressor failure. Sometimes replacing the start relay or a capacitor solves the noise problem and restores normal engine operation. Delay in such cases may cost replacing the entire compressor, which is less economically profitable.
Noise prevention and care equipment
In order for the DEXP refrigerator to operate quietly and for a long time, it is important to regularly carry out preventive measures. Timely defrosting (even for the No Frost system is recommended once a year) prevents the build-up of ice on the fan and evaporator. Cleaning the rear grille from dust and animal hair improves heat transfer and reduces the load on compressorwhich also reduces the noise level.
Monitor the condition of the door seals: if they allow air to pass through, more ice forms in the chamber and the fan works more intensely. Wipe the seals with a soft cloth and check their fit. Proper loading of the chambers with products also affects the acoustics: full shelves dampen vibration, and an empty refrigerator can hum more due to resonance.
Does the amount of food affect the noise?
Yes, a full refrigerator is quieter. The products act as acoustic absorbers and temperature stabilizers, due to which the compressor turns on less often and operates in a more gentle mode.
Regularly check the horizontal position of the installation, especially if you have carried out general cleaning or moved equipment. Even a small displacement can resume vibration. Taking care of equipment and following operating rules is the key to quiet operation of your refrigeration equipment for many years.
Why does the refrigerator hum only at night?
At night the general noise level in the apartment decreases, and the previously unnoticeable working hum becomes audible. Also at night, the voltage in the network may stabilize or, conversely, drop, which affects the operation of the engine. If the noise is not audible during the day due to household sounds, but is annoying at night, try moving the refrigerator away from the wall or checking whether it is on a resonant surface.
Is it possible to lubricate the fan so that it stops humming?
Lubricating the fan is possible, but only if you use special oil for low temperatures. Regular engine oil will harden in the cold and the fan will jam. Most often, lubricant gives a temporary effect, and it is better to replace the worn bearing or the entire fan assembly to avoid repeated failure.
Is it dangerous if the refrigerator hums, but gets cold?
If the unit maintains temperature, but hums, this is not an emergency, but requires attention. Prolonged operation with increased levels of vibration or noise can lead to accelerated wear of the compressor or depressurization of tubes. Ignoring the problem can lead to more expensive repairs in the future.
How to check if the compressor or fan is humming?
Open the refrigerator door. On most models, the fan stops when the door is open. If the hum disappears, the problem is in the fan. If the sound remains, the source of the noise is the compressor or vibration of the housing. You can also carefully place your hand on the body: if the vibration is strong over the entire surface, the problem is in the installation or shock absorbers.