A sudden increase in noise level from refrigeration equipment is a signal that cannot be ignored. If a previously quiet unit begins to emit a hum, whistle, crackling or periodic knocks, this indicates a violation of the normal operating mode of the units. Loud operation can be caused by either a banal displacement of the housing or a serious breakdown of the defrost system or compressor The first thing the owner needs to do is to conduct an initial diagnosis of the nature of the sound. Humming, knocking, gurgling or high-frequency whistling indicate completely different malfunctions. In this article, we will analyze in detail the mechanical, electrical and operational reasons why the refrigerator began to operate loudly, and determine which of them can be eliminated yourself. compressor or defrost systems.
The first thing the owner needs to do is conduct an initial diagnosis of the nature of the sound. Humming, knocking, gurgling or high-frequency whistling indicate completely different malfunctions. In this article, we will analyze in detail the mechanical, electrical and operational reasons why the refrigerator began to operate loudly, and determine which of them can be eliminated yourself.
It is important to understand that ignoring extraneous sounds often leads to accelerated wear of expensive components. Timely identification of the problem allows you to avoid a complete replacement of the compressor or a refrigerant leak. Next, we will look at the main breakdown scenarios and methods for eliminating them.
⚠️ Attention! If loud operation is accompanied by a burning smell, sparking, or strong heating of the housing walls, immediately disconnect the device from the power supply. Operation in this mode can lead to a fire.
Violation of installation rules and vibration of the case
The most common and easily eliminated reason why the refrigerator began to operate loudly is its incorrect installation. Vibration from a running motor is transmitted to the floor and walls if there is no proper shock absorption between the legs of the device and the surface. Even a slight misalignment can turn a quiet hum into an obsessive rattling sound.
Check the horizontal installation using a building level. If the body is tilted, the adjusting screws on the front legs must be tightened. This will ensure that all supports fit snugly to the floor and distribute the load evenly. It is also worth checking the distance to the walls: the gap should be at least 5-7 cm for normal air circulation.
Often the source of noise is objects located on the top cover or inside the chambers. Heavy cans, poorly positioned pots, or even dishes in door racks can resonate with the compressor's vibration frequency. Remove all foreign objects and check if the noise has disappeared.
Another important aspect is the refrigerator body touching other pieces of furniture or heating pipes. When the motor is running, the device may move slightly and hit neighboring objects, creating a rhythmic knocking sound. Move the refrigerator and make sure that it stands apart.
Malfunctions of the compressor and start relay
The heart of the refrigeration system - compressor - when worn or broken, begins to work with an increased noise level. If you hear a loud hum that turns into a metallic clang, or a characteristic click after which the engine does not start, the problem lies in the electromechanical part.
A frequent cause of loud operation is the failure of the starting relay. This element is responsible for starting the engine. If the relay contacts are burnt or the mechanism is stuck, the compressor may hum but not start, or make loud clicking noises when trying to start. In modern inverter models LG or Samsumg diagnostics of the relay is more difficult, since it is built into the control board.
Wear of the bearings or piston group of the compressor also leads to increased noise. In older models with an open compressor, this is often accompanied by vibration of the tubes. If the refrigerator begins to operate loudly precisely because of mechanical wear and tear on the “heart” of the unit, simply replacing parts may not help - the entire compressor unit will need to be replaced.
⚠️ Attention! Replacing the compressor or start relay yourself requires skills in working with electricity and the refrigeration circuit. Unprofessional repairs can lead to freon leakage and final breakdown of the unit.
Pay attention to the nature of the sound. A uniform hum may be normal for high-power models, but if it is accompanied by knocking, grinding or intermittent operation, this is a sign of malfunction. In such cases, it is necessary to call a technician to measure the current and pressure in the system.
What is an inverter compressor and why is it quieter?
Inverter motors do not turn off completely, but only reduce speed. This eliminates the constant start-stop cycles that create much of the noise and vibration in classic models. However, if inverter units break down, they can emit a high-frequency whistle.
Problems with the No Frost system and fan
In refrigerators with the system No Frost the fan is responsible for circulating cold air. If the refrigerator starts to operate loudly and the sound resembles the hum of a turbine or the friction of plastic, most likely the problem is in the evaporator or blower fan.
Over time, ice can build up on the fan blades, which leads to imbalance and noise. The fan bearings can also dry out or wear out, causing a high-pitched squealing noise. In some cases, the blades touch frozen ice or a foreign object that has gotten into the air duct channels.
For diagnostics, it is necessary to dismantle the back panel in the freezer. Visually inspect the fan for icing or mechanical damage. If the impeller has play or turns tightly, it will need to be replaced.
☑️ No Frost fan diagnostics
It is important to note that in models with full No Frost fans can also be located in the refrigerator compartment. If the noise is coming from the front, at the top of the camera, check the top fan. Its malfunction also affects the uniform cooling of products.
Clogged capillary tube and refrigerant sounds
Sometimes “loud operation” is not mechanical noise, but increased gurgling, hissing or whistling coming from inside the pipelines. This indicates disturbances in the circulation of the refrigerant. Normally, the movement of freon should be almost silent.
If a blockage has formed in the system (for example, moisture has entered, turning into an ice plug, or oil oxidation products), the refrigerant passes through a narrow hole at high speed, making whistling sounds. This phenomenon is often accompanied by deterioration of cooling.
The table below will help classify refrigerant sounds and their possible causes:
| Type of sound | Probable cause | Required actions |
|---|---|---|
| Loud gurgling | Normal circulation of freon or its excess | Observation if cooling is normal |
| Whistling or hissing | Clogged capillary tube or leak | Call technician for cleaning or refueling |
| Periodic rumbling | Thermostat or defrost operation | Normal, does not require intervention |
| Metallic ringing in the pipes | Vibration of loose tubes | Carefully move the tubes away from the body |
If you hear a whistle, this may indicate that the pressure in the system is critically increased. Prolonged operation in this mode is dangerous for the compressor. If a leak is suspected (hissing is heard, but there is no cold), it is necessary to ventilate the room, since some types of refrigerants can be dangerous in high concentrations.
System malfunctions defrosting
In refrigerators with an automatic defrosting system, loud sounds may occur when the heating element is turned on cyclically or when water is drained. If the drainage system is clogged, water may drip onto the hot heating element, causing a loud hissing sound and crackling sound similar to frying an egg.
In addition, when defrosting, the ice block on the evaporator may crack with a loud sound, especially if it has frozen around the fan or sensors. If the refrigerator starts to work loudly just at the moment of defrosting, check the drainage hole.
Clogged drainage is a common cause. The water does not have time to go into the pan, overflows the groove and, freezing, creates an ice plug. During the next defrost cycle, the ice cracks or water leaks onto the cabinet. Cleaning the drainage tube with soft wire or warm water often solves the problem.
⚠️ Attention! Parts of the defrost system (heating element, timer, sensor) are energized. Check the electrical part only with the refrigerator completely disconnected from the network.
It is also worth checking the integrity of the defrost heater. If it is not working properly, the ice may not have time to melt, build up and eventually begin to interfere with the fan, causing noise. In models Indesit i Atlant this is a fairly common problem after 5-7 years of operation.
Rare causes and external factors
Sometimes the cause of noise lies not in the refrigerator itself, but in the conditions of its operation. For example, if the device is installed in a niche of a kitchen unit without proper clearance, the resonance of the cabinet walls can greatly amplify any sound of the motor.
Another rare but possible factor is unstable voltage in the electrical network. Voltage surges can cause the compressor to operate abnormally, causing the transformer or starting equipment to hum. In such cases, it is recommended to use a voltage stabilizer.
Do not forget about the age of the equipment. If your refrigerator is more than 10-12 years old, natural wear and tear on the insulation, bearings and seals will inevitably lead to increased noise levels. In this case, loud operation is a sign that the end of its service life is approaching.
Can a refrigerator make noise because of food?
Yes, heavy glass bottles placed close to each other can make noise from the vibration of the shelves. Also, empty shelves can rattle more than full ones.
Frequently asked questions (FAQ)
The refrigerator began to hum loudly only at night, quieter during the day. Why?
At night, the overall noise level in the room decreases, so the operation of the compressor becomes more noticeable. However, if the humming has really intensified, this may be due to a drop in network voltage during peak hours or, conversely, to its stabilization if there were sags during the day. Also, at night the defrosting cycle occurs more often.
Is it possible to lubricate the fan bearings yourself?
Theoretically, it is possible if you remove the fan and get to the bearing. However, most modern models use sealed, maintenance-free plain bearings. Trying to lubricate them with oil may give a temporary effect, but the oil often spreads onto the plastic and winding, which is dangerous. It is safer to replace the fan assembly.
Is the sound of ice breaking inside the refrigerator dangerous?
The sound of cracking ice during defrosting itself is not dangerous. This is a natural physical process. The danger is when ice freezes on the fan and blocks it, which can lead to the fan motor burning out or the blades breaking.
Why is a new refrigerator louder than the old one?
Modern refrigerators often have more powerful compressors and ventilation systems No Frostwhich create constant background noise. Older models cycled and were quieter in standby mode, but could be noisier when starting up. In addition, the thin walls of new models insulate sound worse.