Why knocks the refrigerator: the causes and the elimination of knocking, prevention

Even the most modern and expensive models of refrigerators can hardly be called completely silent. But if clicks, knocks when switching on / off or others join the measured buzz of the unit unusual sounds - this device gives a signal that it is time to arrange an inspection with the possible replacement of worn out details.

Therefore, let us examine in more detail why the refrigerator knocks, and how you can get rid of the noise.

The content of the article:

  • Easy causes of noise
    • No. 1 - improper installation or operation
    • No. 2 - loose compressor mount
  • Failure of individual parts
    • Break # 1 - incorrect fan operation
    • Break # 2 - Motor Fault
  • Tips to prevent knocking
  • Conclusions and useful video on the topic

Easy causes of noise

If a knock is heard in a technique that has been working faithfully for more than a year, the wizard calls the compressor the most likely cause.

But if we are talking about a new refrigerator, the problem may lie simply in grinding new parts or improper operation of the unit. Therefore, before calling a repair specialist, make sure that you cannot get rid of the noise yourself.

No. 1 - improper installation or operation

The simplest and most common reason for a working refrigerator is knocking and other unusual sounds - insufficiently even base.

Even if visually it seems that the device is installed correctly, the check will not hurt, because uneven floor one of the legs of the unit can only be in contact with the surface, or even just hang in the air. This causes the entire body to vibrate when the engine is running.

To check the evenness, you can use the horizontal building level, putting it on the "roof" of the unit. Replacing the tool will help a simple plumb from a strong thread and a small weight, for example, nuts.

Installing the refrigerator level

Virtually all modern refrigerators are equipped with adjustable legs on a thread, with which you can correctly set the device to the level

Another source of sound may be compressor in contact with other metal parts.

Also knock can be published tubes bent during transport device. In this case, you need to gently bend the elements or put rubber pads to eliminate the touch.

If the refrigerator has been operating for a long time and suddenly began to emit various noises, first check the temperature inside its chambers. Does the device freeze properly, and nothing force majeure, except for unusual knocks and rattles, was detected?

Perhaps the reason for the increased noise lies in the overloaded shelves or the placement of the products themselves - pots, cans and other hard containers may touch and knock on each other when starting up or turning off the motor.

Try to completely free the unit from the inventory inside, including the items on the roof of the case. If the noise disappeared - the issue is resolved.

Evenness of internal shelves

The reason for the incomprehensible sounds during the operation of the refrigerator may be unevenly installed or insufficient firmly fixed shelves inside the unit - they also need to be checked for horizontal / vertical

But if you see other problems during the inspection, for example, a broken backlight, a snow raid or an obvious The "shortage" of temperature indicators, most likely, will need to be examined and replaced those that failed. the details.

No. 2 - loose compressor mount

If the refrigerator has just "moved" to your permanent place of residence, before switching on, make sure that the transport bolts or other fastenings that secure the compressor are removed.

True, such protection is not provided for all models, so it would be useful to look into the instructions and study the recommendations about the first launch of the refrigerator.

Compressor Shipping Bolts

The compressor bolts firmly fastened to the body so as not to shake up not to damage the pipeline or the body of the refrigerator

If the situation is reversed - the refrigerator has been working at a fixed place for a long time and suddenly it started knocking, the landing fasteners holding the compressor might have loosened, or rubber gaskets would wear out.

Such a problem is not uncommon for older models where springs are used, and if the compressor is skewed, when turned on / off, its casing will knock on the case, swinging the refrigerator.

Repair measures are simple here - the springs should be tightened or replaced, the bolts should be tightened, the gaskets should be renewed.

Compressor fasteners

To make sure that the source of the noise lies precisely in the loosened fasteners, it is enough to put a hand on the working motor, and if the knock stops - try to tighten the fastening screws

To align the position of the suspension, you need:

  1. Unscrew the fastening screws and dismantle the capacitor - this is in case it interferes with the inspection of the compressor.
  2. Check the annular gap between the rubber bush of the frame and the support of the casing - it should be uniform.
  3. If a discrepancy is found - unscrew the screws securing the springs to the frame a half-turn and adjust the degree of tension in order to achieve the same clearance along the entire perimeter of the part.
  4. After that, you can turn on the device, check its position with a slight rocking and if everything is in order, install the capacitor in its place.

A knock may occur due to an object stuck behind the condenser tubes located on the rear wall. unit, because many owners roof device is used as a convenient shelf for storing all sorts of small things.

Therefore, carefully inspect the elements, and if there is a foreign element - remove, and at the same time and check whether the tubes are in contact with the body of the refrigerator.

Failure of individual parts

In addition to improper installation and other easily fixable problems, knocking or clicking in the refrigerator can signal problems in the operation of its component parts.

And although the leader of breakdowns recognize the worn-out compressor, other parts of the refrigerator can be a source of incomprehensible sounds. Consider the most common options for faults.

Break # 1 - incorrect fan operation

If a layer of frost freezes in the area of ​​the fan, the rotating blades will touch the frost, and the refrigerator will emit various clicks and grinding sounds. At hit of snow or pieces of ice from the frozen evaporator - also knock.

Internal device of the refrigerator

In case of insufficient air circulation, the fan impeller will rotate continuously to minimize the temperature level in the refrigerator chamber.

The cause of increased snow production can be several.

Incorrect temperature setting. To speed up the freezing of products or to prepare dishes with gelatin, hostesses often switch the cooling controller to maximum, and then forget to convert to medium.

Inadequate ventilation. If the room is too hot, for example, in the summer or during active cooking, when the stove and oven work.

Either the device is too close to the wall or the heating radiator, the compressor will operate continuously, pumping cold.

Untight door. In the case of a refrigerator, especially an old one, the sealant cracks over time or the containers with products do not allow to completely isolate it from the external environment.

In any case, if warm air from the room continuously flows into the device, on the heater frost will quickly appear, and the engine will run to wear, trying to achieve the desired performance temperature

Evaporator failure. Such a breakdown is often found in models with the NoFrost automatic defrost system. And when the evaporator is covered with ice, the air stops circulating, forcing the fans to work continuously.

The first step is to completely defrost the device (at least 10 hours), check the set temperature, door tightness, ventilation gaps.

In addition, it does not hurt to update the lubricant in the bearings of the fan - over time it dries.

It is also worth checking the condition of the impeller motor winding - during long uninterrupted operation, it may burn and require replacement. And only after that re-connect the unit to the mains.

Refrigerator information display

In modern refrigerators, a display is installed on the control panel, which displays information about the temperature in the various compartments of the device, and if there is a breakdown, a hint with an error code is displayed

If the noise disappeared, but reappeared a few days later, the problem most likely lies in the icy evaporator.

And to inspect the part, you need to remove the inner panel in the back of the refrigerator, which protects its structural elements. Disassembly nuances should be indicated in the instructions.

But it could also be caused by a refrigerant leak or a capillary tube blockage.

Ice on the heater

Snow coat, ice on the back of the refrigerator or its parts - a signal that should not be ignored, because it can lead to serious damage

In any case, it is better to turn off the device and call the wizard for diagnostics. If the refrigerator continues to work, a compressor or a fan may fail, and repairs will be much more expensive.

Break # 2 - Motor Fault

The heart of the refrigerator is hidden on the back of the appliance. The task of the compressor is to inject pressure so that the vaporized refrigerant enters the condenser, cooling the chamber, and then, heating up, turned into a liquid, got into the evaporator, and again returned to the initial the point.

If any malfunction breaks this cycle, the refrigerator will not freeze.

Refrigerator compressor

The most common motor-compressors - oil, visually, they represent a small metal tank, painted black

If the compressor is broken, clicks and knocks will be heard - this starting relay unsuccessfully tries to start the engine. In this case, it is better to turn off the refrigerator before repairing or replacing a worn part.

True, most of the masters do not undertake to disassemble and repair the dead compressor, and immediately recommend to change it to a similar model. After all, even if it is possible to reanimate the motor, it can break again at any time.

If everything is not so obvious, and the device works, but with interruptions, clicks and knocks, it is possible the failure of the motor bearings or the deterioration of the cylinder seal.

But since the engine with the compressor is enclosed in a sealed case, it is not disassembled, but simply replace the device with a new one.

Compressor replacement

Independently perform such repairs is quite difficult, because, in addition to relevant skills, you will need and professional tools: oxygen propane burner, coolant tank and valve for piercing

Replace with this:

  1. The refrigerator is disconnected from the network, released from the food and defrosted.
  2. The compressor needs to be extended, lifted, and broken. The motor then starts for a few minutes so that the refrigerant is completely transferred to the condenser.
  3. Now, with the aid of a puncturing valve, the hose of the selection cylinder is connected and gas is collected. The substance is explosive, so it is recommended to work with the window open.
  4. The filling tube is replaced by a copper one and is soldered by a torch, and if not, a soldering iron.
  5. Then you need to make an incision in a couple of centimeters on the capillary expander, break off the tube with pliers and unsolder the filter from the condenser.
  6. After that, the compressor is completely disconnected from the other pipes and the housing itself. Usually two tubes - for the withdrawal of excess gas and discharge pressure.

It remains to replace the new heart of the refrigerator, repeat the steps in the reverse order and perform a test run.

Tips to prevent knocking

In order for the device to work without unnecessary acoustic accompaniment, do not ignore the rules of its operation and recommendations for installation.

Do not be lazy to check the level of the flatness of the floor in the place under the refrigerator. In advanced cases, it is easier to use a strong backing than to try to level the position with the legs.

Feet height adjustment

To ensure that the door of the refrigerator closes itself on the principle of an automatic closer, raise the front legs to a height of 1-1.5 cm

Practical tips:

  1. Determine the refrigerator the right place - with at least 50 cm away from the battery, oven and stove. It is also undesirable that direct sunlight from the window falls on the unit - additional heating of the housing is of no use.
  2. A gap of at least 10 cm is required between the wall and the back wall of the device.
  3. Do not use the cover of the device as a storage of various items and do not try to install a microwave on such a convenient shelf - such “neighbors” significantly reduce the service life of the unit.
  4. Adjust the internal shelves and drawers to a comfortable height for you and properly distribute the products and containers inside the chambers.
  5. Do not switch on modes with fast freezing for a long time and the lowest possible cooling temperature, especially in the hot season.

And the last obvious, but so rarely performed, advice defrost your fridge on timewithout waiting for heavy snow growths and ice.

Conclusions and useful video on the topic

In order to get a better understanding of the sound presentation that a refrigerator can arrange, and to eliminate possible breakdowns, we suggest studying our selection of video materials.

What sounds can make a refrigerator:

What to do if there is uncharacteristic noise from the device:

Disassembly and repair of refrigeration units with NoFrost system:

How to replace a failed compressor with your own hands:

If you are poorly oriented in the refrigerator unit, and simple troubleshooting methods did not help to cope with extraneous sounds, it’s better to call a technician repair technician. It will be cheaper than independent experiments.

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