Why knocks the refrigerator: finding the cause and methods of eliminating knocking

Even the most modern and expensive models of refrigerators can hardly be called absolutely silent. But if clicks, knocking on / off or other abnormal sounds are added to the measured buzz of the unit, this device gives a signal that it is time to arrange an inspection with possible replacement of worn parts.

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

Easy causes of noise

If a knock is heard in a technique that has been working faithfully for more than one year, the most likely cause of the master is called a compressor breakdown.

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 specialist to repair, make sure that you can not get rid of the noise on their own.

No. 1 - improper installation or operation

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

Even if visually it seems that the device is installed correctly, the check does not hurt, because due to the uneven floor one of the legs of the unit can only touch the surface, or simply hang in the air. This causes the entire body to vibrate when the engine is running.

To check the flatness, 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 becompressor in contact with other metal parts.

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

If the refrigerator has been working 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 overloaded shelves or the placement of the products themselves - pots, cans and other hard containers may touch and knock about each other when starting 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 can be unevenly installed or insufficiently fixed shelves inside the unit - they also need to be checked for horizontal position / verticality

But if other problems appear during inspection, for example, an inactive backlight, a snow raid or an obvious “shortage” of temperature indicators, you will most likely need to inspect and replace the defective parts.

No. 2 - loose compressor mount

If the refrigerator has just “moved” to your permanent place of residence, before switching on, make sure that the shipping bolts or other fasteners are removed,which fixes the compressor.

True, this 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 transportation bolts of the compressor are firmly attached 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 old models where springs are used, and if the compressor is skewed, when you turn on / off its housing 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 tightening the fixing screws

To align the position of the suspension, you need:

  1. Unscrew the fastening screws and dismantle the condenser - this is in case it interferes with the inspection of the compressor.
  2. Check the annular gap between the rubber sleeve 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 around 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.

Knocking may occur due to an object stuck behind the condenser tubes located on the rear wall of the unit, because many owners use the roof of the device as a convenient shelf for storing all kinds 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 in the area of ​​the fan a layer of frost freezes, the rotating blades will touch the frost, and the refrigerator will emit various clicks and gnashing. 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 compartment.

The cause of increased snow production can be several.

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

Insufficient ventilation. If the room is too hot, for example, in the summer or when cooking is active, when both the stove and the 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 refrigerator, especially the 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 inside the device, frost will quickly appear on the heater, and the motor will run for wear, trying to achieve the desired 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 - with long uninterrupted operation, it can burn and require replacement. And only after that re-connect the unit to the mains.

Refrigerator information display
Modern refrigerators have a display on the control panel, which displays information about the temperature in different compartments of the device, and if there is a breakdown, a prompt 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
A snow coat, ice on the back of the refrigerator or its parts is 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, the compressor or the fan may fail, and repairs will be much more expensive.

Break # 2 - Motor Compressor Malfunction

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 vaporous refrigerant enters the condenser, cools the chambers, then, when heated, turns into a liquid, enters the evaporator and returns to the starting point again.

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 motor. 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 that the bearings of the electric motor fail or the cylinder seal is worn.

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 professional tools: an oxygen-propane burner, a coolant tank and a valve for piercing

Replace with this:

  1. The refrigerator is disconnected from the network, freed from food and defrosted.
  2. The compressor needs to be extended, lifted, and broken. Then the motor starts for a few minutes so that the refrigerant is completely transferred to the condenser.
  3. Now, with the aid of a piercing 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 correct place for the refrigerator — with a minimum distance of 50 cm from the battery, oven, and stove. It is also undesirable that direct sunlight from the window falls on the unit - additional heating of the cabinet will not matter.
  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 lid 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 activate for a long time regimes with fast freezing and the lowest possible cooling temperature, especially in the hot season.

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

Conclusions and useful video on the topic

In order to understand in more detail 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:

Dismantling 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 is better to call a technician repair technician. It will cost less than independent experiments.

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