Pozis refrigerator clicks: fault diagnosis and troubleshooting methods

Sudden knocking or periodic clicking in the refrigerator Pozis often becomes the first alarm signal for the owner. Instead of the usual smooth hum of a running motor, a sharp sound is heard, which may be followed by silence or a repetition of the cycle. This situation requires immediate attention, as it indicates problems in the electrical circuit or mechanical part of the unit.

The refrigeration equipment of this brand, be it a classic model RD-250 or a modern one, is built on time-tested operating principles. However, component wear is inevitable. If you hear a Fridge 5009, built on time-tested operating principles. However, component wear is inevitable. If you hear how relay clicks, this means that the system is trying to start the compressor, but is encountering an obstruction. Ignoring these sounds can lead to complete failure of an expensive unit.

In this article we will look in detail at why extraneous sounds occur, how to distinguish normal operation from an emergency situation, and what steps you can take on your own. Understanding the nature of sound will help you save time and money, and in some cases, prevent food spoilage.

The nature of sound: why the refrigerator makes clicking

To understand the source of the problem, you need to know the trigger mechanism. In most models Posis the starting relay is responsible for starting the engine. It is this element that produces a characteristic click when the compressor is turned on and off. In good condition, this sound is barely noticeable against the background of the motor.

If the clicks become loud, frequent or rhythmic, this indicates that the circuit opens and closes without successfully starting the engine rotor. Starting relay receives a start signal, supplies voltage, but the engine does not starts, the protection is activated, and the cycle repeats. This is similar to trying to start a car with a dead battery when the starter just clicks.

There are two main types of relays used in technology Pozis: induction and posistor. Induction ones have a movable core that physically moves and over time can begin to knock louder than usual. The posistor ones operate more silently, but if they break down, sound effects are also possible due to breakdown or cracks in the ceramics.

⚠️ Attention: If clicks are accompanied by a burning smell or smoke, immediately unplug the refrigerator. Continued operation may lead to a fire in the wiring.

Start relay malfunctions and their symptoms

The most likely reason that the refrigerator Position clicks but does not freeze lies in the start protection relay. This small unit attaches directly to the compressor. Inside it is a mechanism that must close the starting winding of the engine for a fraction of a second to give the rotor initial rotation.

When the relay contacts burn out or stick, they no longer provide a reliable connection. As a result, an electric arc occurs, accompanied by crackling and clicking sounds. The engine hums, trying to turn over, but the protection relay cuts off the power to prevent the windings from burning out. After some time, the thermal relay cools down and tries to start the engine again.

You can determine the type of relay visually by removing the back cover of the unit. Models Position are characterized by the following signs of malfunction:

• 🔌 Induction relay: when shaken, a ringing sound is heard (the core is broken) or, conversely, complete immobility (sticking).
• 🔥 Posistor relay: traces of soot, melting or cracks are visible on the body.
• ⚡ Contacts: during disassembly, black deposits are visible on the contact groups.

Replacing the relay is a procedure accessible even for an inexperienced user, provided safety precautions are followed. It is important to choose an analogue with identical characteristics, since the starting current parameters for different compressor models may differ.

Problems with the compressor: when the motor knocks

If replacing the relay did not help and the refrigerator Pozis continues to click, the problem may be deeper. Sometimes the source of the sound is itself compressor. Internal mechanical damage, such as wear of bearings or valves, can cause a knock that is transmitted to the housing and is perceived as clicks.

A special case is an interturn short circuit of the motor windings. In this case, the starting current becomes too large, the relay tries to start the motor, a powerful click is heard, the protection is triggered, and the cycle repeats. You can check the windings using a multimeter by measuring the resistance between the contacts.

Normal resistance values for a working compressor Position usually are within the following limits:

If the measurements showed a short circuit or breakdown to the housing, repair the compressor in impossible at home. The entire unit must be replaced, which is a time-consuming and expensive procedure that requires evacuating the system and charging it with freon.

⚠️ Attention: Do not attempt to disassemble the sealed compressor casing. This will break the tightness of the system and make further repairs economically unfeasible.

The influence of voltage drops and wiring

Unstable power supply is the hidden enemy of household appliances. If your network experiences frequent power surges, the refrigerator Position may behave inappropriately. At low voltage, the engine does not have enough power to start, which causes the thermal protection to trip and characteristic clicks.

It is also worth checking the condition of the socket and plug. Loose contacts at the junction lead to sparking and heating. This process may be accompanied by a crackling noise, which can easily be confused with sounds from inside the refrigerator. Poor contact is dangerous not only for equipment, but also for the fire safety of the home.

It is recommended to perform the following steps to check the electrical network:

• 🔌 Check the tightness of the plug in the socket.
• 🔦 Inspect the socket for blackening or melting.
• 📉 Use a voltage stabilizer if the lights in the house flicker frequently.

Using low-quality surge protectors can aggravate the situation. Cheap models cannot cope with the starting currents of the refrigerator and themselves become a source of resistance, the “soul” of the motor at the time of startup.

Thermoregulator and sensors: electronic control

In modern models Pozis with a system No Frost or electronic control, it is responsible for starting the compressor an electronic module that receives signals from temperature sensors. If the thermostat is faulty, it may send false commands to turn on, or, conversely, not give a command to start, although the relay may make sounds.

The mechanical thermostat (in older models) may also click. This is the normal sound of the contacts opening when the set temperature is reached. However, if the clicks become too frequent, the sensing element may have lost calibration or the capillary tube is damaged.

Signs of problems with thermoregulation:

1. The refrigerator turns on and off too often (short cycle).
2. The temperature inside the chambers is not correct installed.
3. Clicks are heard even when the compressor is not clearly trying to start.

How to check the thermostat?

For a mechanical regulator, you can close the contacts of the incoming and outgoing terminals (after disconnecting from the network!). If, when plugged in, the compressor starts and runs continuously, the regulator is faulty. Electronic sensors require testing with a multimeter at different temperatures.

Water hammer and refrigerant noise

Not all clicking sounds come from electrics. Sometimes processes occur in the refrigerant circulation system that can be described as clicking or soft knocking. This may be due to uneven boiling of freon or the presence of excess oil in the circuit.

The so-called water hammer occurs if liquid freon enters the compressor cylinder instead of gaseous one. This is dangerous for the valve group. Often this sound is heard immediately after the engine stops or at the moment it starts. Unlike electrical clicks, these sounds are more dull and “liquid.”

If the refrigerator has recently been transported, the oil may not have returned to the compressor crankcase. In this case, the unit must be allowed to stand in an upright position for several hours before turning it on. Ignoring this rule is a common cause of early breakdowns.

⚠️ Attention: If after transportation you turn on the refrigerator and hear strange sounds, turn it off immediately. Let the equipment sit for at least 4-6 hours to stabilize the refrigerant.

Algorithm of actions when a malfunction is detected

When you are faced with the problem of a clicking refrigerator Position, it is important to act consistently. Panic and chaotic actions can lead to worsening breakdowns. First, carry out a visual inspection and initial diagnostics without disassembling complex components.

Make sure that the refrigerator is level, the legs are adjusted, and vibration is not transmitted to furniture or walls, creating a resonating sound. Check that the rear grille is not touching a wall or other objects. Sometimes a foreign object that has fallen behind the refrigerator can enter the fan (in models No Frost), creating a rhythmic knocking.

If external causes are excluded, proceed to checking the electrical part. Remember that working with live electricity is dangerous. All manipulations inside the case, removing covers and checking contacts should be carried out only with the device disconnected from the network.

FAQ: Frequently asked questions

Is it possible to operate a refrigerator if it clicks, but retains the cold?

Short-term operation is possible, but undesirable. Clicking sounds indicate a difficult start of the compressor, which leads to overheating and shortened service life. In addition, there is a risk that at one point the motor will stop starting completely, and the products will deteriorate.

How much does it cost to replace the starting relay for Pozis?

The cost of the relay itself usually ranges from 500 to 1500 rubles, depending on the model and manufacturer of the spare part. The work of a replacement technician can cost from 1000 to 2500 rubles. Independent replacement will only cost the price of the part.

Why does the refrigerator click only at night?

At night, the voltage in the network may drop due to less load on the general network, or silence makes sounds more noticeable. Doors are also opened less frequently at night and operating cycles become more consistent. If the clicks are rhythmic and loud, this is a sign of a malfunction that does not depend on the time of day.

Is it possible to lubricate the relay so that it stops clicking?

No, the start relay is a sealed or semi-sealed unit that does not require lubrication. An attempt to lubricate the contacts will lead to contamination, carbon deposits, and other damage. A faulty relay can only be replaced.