Refrigerator malfunctions – what can break in the refrigerator?

r?

When equipment becomes unusable, it is always unexpected, at the wrong time and extremely inappropriate. Refrigerator damage is no exception. This article discusses how to conduct an independent diagnosis to determine the true culprit refrigerator malfunction and repair it yourself.

Contents of the article:

• How does a refrigeration chamber work?
• How to correctly diagnose refrigerator components
• How to diagnose a refrigerator compressor
• How to diagnose a capillary system
• Methods for checking the operation of the thermostat
• How to properly check the components of a device with self-defrosting (No Frost)
• How to Diagnose a Defrost System
• How to check the operation of such a system:

How does a refrigeration chamber work?

The first refrigerators were invented at the beginning of the 20th century. Their research was based on a specific temperature process observed in refrigerants—the cooling of a substance as it changes from gas to liquid.

The principle of operation of the refrigerator is not at all complicated. The pressure created in a closed system by a compressor facilitates the transition of the coolant from a gaseous to a liquid state. In this process, heat is generated, which is dissipated through the rear panel of the refrigerator into the surrounding air. The refrigerant bypasses the capillary units in a liquid state and enters a low-pressure zone. Freon boils, after which it goes into a gaseous state.

The refrigerant boils at a negative evaporator temperature. This explains the cooling of the walls as a result of exposure to cold. Cold air cannot enter the atmosphere because the refrigerator compartment is completely sealed. As you know, freon circuits are mobile – closed circuits, which explains the phenomenon that freon constantly changes its physical state from gas to liquid and vice versa.

In addition to the above elements, there are other additional nodes. For example:

• Temperature regulator. Plays in such a way that it supports the vegetation of stucco worship;
• The filter is a drainage filter. He supports Kontaklon’s testimony.

Recently, the automatic defrosting function (no frost), which literally means “no frost,” has become very popular in refrigerators.

How to correctly diagnose refrigerator components

The dimensions of the evaporator wall look pretty exciting, but there aren’t many parts to break. In many cases, finding a fault is not difficult. This means that it does not take much time.

To properly diagnose a faulty refrigerator unit, you need at least minimal knowledge about refrigerator devices, as well as knowledge in the field of electronics. Without such knowledge, it is wiser to leave the diagnosis to specialists in their field. Don’t forget to unplug the refrigerator before starting work!

How to diagnose a refrigerator compressor

All technologies have a “heart”. In the case of a refrigerator, this is the compressor. The speed at which the required temperature in the chamber is established depends on how efficiently the compressor operates. A faulty compressor is the most expensive refrigerator repair.

The cause of a compressor malfunction may be a malfunction of both the mechanical and electrical components of the device. To diagnose electrical equipment yourself, you will need a multimeter.

• Make sure the refrigerator is unplugged before starting measurements.
• To access the compressor terminals, it is necessary to remove the protective starting relay from the housing.
• The right terminal is the output of the working winding. And on the left is the starting winding. The output at the top is the common point for both motor windings.
• To carry out diagnostics, it is necessary to measure the resistance of each winding one by one, and then measure their total resistance. To check the windings in working condition, measure the first terminal between the top and right terminals and the second between the top terminal and the left terminal.
• Typically for low capacity compressors the resistance is around 15 ohms and the first resistance is less than 20 ohms.
• Another measurement is taken to check the overall integrity of the winding. It is necessary to measure the resistance of the left and right terminals of the compressor terminal box.
• If the winding is in good condition, then the instrument reading will be equal to the total resistance of the two windings (the result of the sum of previously obtained measurements). The overall result will be approximately 35 ohms.
• It is also necessary to ensure that there is no short circuit in the compressor windings. If the electrical system is normal, the measured value indicates that there is no circuit for current to flow.
• Each device has its own winding resistance indicator. They can be found on the Internet.
• To check the mechanical parts, the pressure in the cooling circuit must be relieved. It is good if this is done by a specialist who has all the necessary equipment.
• Diagnostics consists of connecting a pressure gauge to the compressor and directly measuring the pressure in the lines. If, after connecting the refrigerator, the pressure gauge shows 4 bar, the compressor is fully operational. If less, the compressor needs to be replaced.

How to diagnose a capillary system

If there are no problems with the compressor, and the temperature in the refrigerator is not low enough, the cause may be a clogged capillary tube. Due to this problem, the full circulation of freon is disrupted and the normal operation of the refrigerator is disrupted.

This problem can be determined by observing the temperature at the compressor inlet. With rapid heating and equally rapid cooling, one can easily suspect a blockage of the capillary system. A clog can be diagnosed by feeling the condenser. If heating is uneven, problems are most likely due to clogging.

Only after the system has been fully depressed will they talk about the cause of the problem. A pressure gauge should be connected to the pipe, and if a negative value is detected (on the compressor), this will definitively confirm the presence of a blockage.

Methods for checking the operation of the thermostat

Maintaining the required temperature is the job of the thermostat. Simply put, it is a switch that turns off once the required temperature is reached. A malfunctioning thermostat can cause the refrigerator to run continuously and vice versa.

Diagnostics is not difficult: just short-circuit three wires (connected to the nodes) and connect the refrigerator to the network. Previous models used two wires. If everything is under control and the refrigerator is working, the problem lies in the compressor, which needs to be replaced.

If this does not help, the cause may be a suspected regulator failure and replacement. Replacing these elements is easy. The most important thing is to prevent ruptures of components and cutting of gas pipes.

How to properly check the components of a device with self-defrosting (No Frost)

In this case, diagnosis is carried out in a similar way. However, since there are improved elements in this system, diagnostics are discussed in more detail.

Check the fan. The main component of the rapid defrosting system is the fan. It is this that helps cool the air that constantly circulates in the refrigerator compartment. It is very easy to check its operation. All you have to do is listen. You can visually check the operation of the fan. To do this, remove the back wall of the freezer and carefully inspect the fan impeller. There should be no cracks on the blades.

How to Diagnose a Defrost System

Due to insufficient cleanliness of the evaporator, there may be obstacles to the complete passage of air, which leads to insufficient cooling of the chamber. This may result in maximum energy consumption. A defrosting timer, a set of thermostats, and heating elements are all components of a defrosting system.

Principles of system operation. After the time set by the timer has expired (from 4 hours to 1 day for different models), the compressor turns off. Over the next 20 minutes, the heater heats up and thus defrosts the ice.

How to check the operation of such a system:

• Atactic posterior cumorosilins are removed;
• Turn the knob or press the forced shutdown button (depending on the type of timer);
• As soon as the work is stopped, the cheese should start working.

If this does not happen, then you should check whether the heating element is working (the resistance should be about 300 Ohms), one relay when the temperature is reached. temperature + 10 C. If a problem is found, replace the new component with a new component.

If all heating units and thermostats are working correctly, the problem is the defrost timer and should also be replaced.