Refrigerators of the brand Polyus, popular in the Soviet period and still actively used in many households, are distinguished by enviable reliability and simplicity of design. However, even such time-tested equipment can fail, and one of the most common reasons for the lack of cold is a malfunction of the start-up relay. It is this small unit that is responsible for starting the compressor engine and protecting it from overloads, so its correct operation is critical for the functioning of the entire system.
When you are faced with a situation where the unit hums but does not start, or the motor clicks and immediately turns off, the first thing experienced technicians recommend is to check the condition of the electrical start circuit. In most models, such as Pole 10, Pole 26 or Sviyaga, this component is located directly on the compressor housing, which makes it easier to access if necessary for diagnostics. Understanding the exact location and operating principle of this element will allow you to independently determine the nature of the malfunction.
In this article we will look in detail at how to visually identify the relay, what tools are needed to check it and what to look for attention to avoid mistakes during repairs. It is important to understand that electrical safety when carrying out any work with household appliances is priority number one, so before starting any manipulations you must make sure that the device is completely disconnected from the network.
⚠️ Attention: Before touching any internal components of the refrigerator, be sure to remove the plug from sockets Residual voltage in capacitors or accidental switching on can lead to serious electric shock.
Design features of Polyus refrigerators
Refrigeration equipment of the series Pole was developed taking into account harsh operating conditions and unstable voltage in the electrical networks, which was typical for the period of their mass production. The compressors in these models are usually of the piston type and are equipped with a starting winding, which is activated only when the engine starts. This process is controlled by an electromechanical device, often called a “tablet” or “box,” attached to the motor terminals.
The location of the compressor in the lower rear part of the unit is dictated by the need for effective cooling and minimizing noise. It is there, in a special niche hidden by a metal casing or plastic cover, that everything is located. Access to the relay in refrigerators compressor-condenser group. Access to relays in refrigerators Pole 6 and later modifications does not require disassembling the refrigerator itself, you just need to remove the protective casing at the back.
The design of the starting mechanism in these models is often is based on the use of an electromagnetic relay with or without a posistor, depending on the year of manufacture and the type of installed motor. Older models used heavy copper-wound relays that were highly repairable, while newer versions use compact internally molded plastic housings or easily replaceable units.
Exact location of the start relay
To find the relay, you do not need to look for it inside the refrigerator or freezer compartment. As already mentioned, this element is part of the external cooling unit. You need to approach the refrigerator from behind and go down to the base part, where it is located motor-compressor. In models Pole 10 and similar ones, it is closed with a metal casing, which is secured with bolts or latches.
After removing the casing, you will see a black cylindrical or pear-shaped tank - this is what it is compressor On the side of it (usually on the left when looking at the compressor from behind) three copper leads protrude in the form of a triangle. A black or gray plastic box is placed directly on these terminals. This is the desired starting relay. It can be additionally secured with a metal bracket or simply sit tightly on the contacts.
In some modifications, for example, in a refrigerator Pole 26, a capacitor that looks like a small cylinder can be connected to the relay. The wires from the relay go to the thermostat and the power plug. It is important not to confuse the relay with a thermal relay, which is located inside the refrigerator compartment and regulates the temperature - we are interested in the trigger mechanism on the compressor.
- 🔍 Visual inspection: Look for a black plastic block placed on the pins of the compressor.
- 🔌 Connection: Wires from the power cord and internal wiring of the refrigerator are suitable for the relay.
- 🛡️ Protection: Often the relay is covered with a metal frame or bracket for fixing on the motor housing.
It is worth noting that Depending on the specific series, the appearance of the relay may differ. There are models with vertical and horizontal contact mounting. If you are not sure which type is installed in your case, it is best to photograph the unit before dismantling it in order to later find an exact analogue for replacement.
Symptoms of a faulty start relay
You can determine that the problem lies in the start relay by the characteristic signs that appear when the refrigerator is operating. The most obvious symptom is the so-called “idling”, when the engine hums for 3 to 10 seconds, then a loud click is heard and the unit goes silent. This indicates that the starting winding does not turn on or does not turn off in time, and the thermal protection is triggered.
Another sign may be a complete lack of response to connection to the network. If you plug in the refrigerator and there is silence even though there is voltage in the outlet, this could mean an open circuit inside the relay or a burnt-out posistor. In some cases, the relay may “stick”, due to which the compressor operates continuously without turning off, which leads to severe overheating and freezing of the “coat” in the evaporator.
It is also worth paying attention to the smell. If a specific smell of burnt plastic or burning appears in the compressor area, this is a sure sign that a short circuit or overheating of the contacts has occurred inside. In such cases, further operation of the equipment is dangerous and requires immediate intervention. starting mechanism a short circuit or overheating of the contacts has occurred. In such cases, further operation of the equipment is dangerous and requires immediate intervention.
⚠️ Attention: If the compressor is hot to the touch after trying to start, do not try to immediately turn it on again. Allow the motor to cool for 30-40 minutes, otherwise the thermal protection relay may not operate in time and the engine will burn out.
Sometimes a relay malfunction is disguised as other problems. For example, if the refrigerator starts only after lightly tapping the relay body, this indicates burnt contacts or mechanical sticking of the core. However, you cannot rely on this method of “treatment” - this is only a temporary measure, and the breakdown will soon recur in a more serious form.
Diagnostics and performance testing
Before going to the store for a new part, you need to make sure that it is faulty. For diagnostics you will need a multimeter (tester). First of all, the relay must be carefully removed from the compressor contacts. It is usually held tightly, so a slight rocking from side to side may be required. Don't forget to take a picture of the wire connection diagram first.
After dismantling, inspect the case for cracks, melting or burnt marks. If there are no external defects, we proceed to “dialing” the contacts. Switch the multimeter to resistance (Ohms) measurement mode. For a relay with a posistor (three contacts), the resistance between certain terminals must be within normal limits, and a posistor at room temperature can show high resistance, which drops when heated.
In electromagnetic relays, the integrity of the winding and the mobility of the core are checked. If, when shaken, the relay makes a rattling sound, as if a part is loose inside, this may be a sign of failure. The thermal relay is also checked (if it is built into the starter housing) - it should “ring” in a cold state.
How to check a posistor without heating?
A posistor is a thermistor. At room temperature its resistance is high (hundreds of ohms or kiloohms). When heated with a hairdryer or lighter (carefully!), the resistance should drop sharply to almost zero. If there are no changes, the part is faulty.
It is also important to check the capacitor if it is present in the circuit. It should not have swelling or electrolyte leaks. When making a call, the tester's needle (or the numbers on the screen) should first twitch, indicating the charge, and then go to infinity. If the capacitor “rings” like a wire or shows zero, it is broken and requires replacement along with the relay.
Step-by-step instructions for replacing the relay
If the diagnostics confirmed a malfunction, the only correct solution would be to replace the unit. Repairing old relays is possible, but requires high skill and often does not guarantee longevity, so installing a new component is a more rational choice. To work, you will need a screwdriver, pliers and, possibly, electrical tape or heat shrink.
The first step is to select an analogue. Relays from refrigerators Polyus, Sviyaga or Zil are often interchangeable if the compressor power and connection type match. Pay attention to the markings: for example, RTK-1, R-3, R-1 and others. The power must correspond to the power of your motor, otherwise the relay will burn out or the compressor will not start.
☑️ Checklist before replacing the relay
The replacement process is as follows: carefully remove the old relay by disconnecting the wires (if they are at the terminals) or simply pulling the block off the contacts. Clean the contacts on the compressor from oxides with fine sandpaper, if necessary. Put on the new relay strictly in the same position as the old one was - the top and bottom are important for the correct operation of the mechanism.
Connect the wires according to the photograph taken earlier. Make sure the connections are tight and not loose. If the terminals are oxidized, it is better to clean them or replace them. After installation, assemble the casing, but do not screw it tightly yet. Plug in the refrigerator and listen: the motor should start with a characteristic hum, and after a while turn off when the temperature is reached.
| Relay type | Compatible models | Installation features | Average price (rub) |
|---|---|---|---|
| RTK-1 | Polyus 10, Sviyaga, Don | Vertical landing, 3 contacts | 400 - 600 |
| R-3 | Polyus 26, Zil | Horizontal, with capacitor | 500 - 700 |
| P-1 | Old models Pole | Heavy, electromagnetic | 300 - 500 |
| Posistor 12 Ohm | Universal | Inserted inside the housing | 50 - 100 |
Common mistakes during repairs and precautions
When independently repairing refrigerators Pole amateur craftsmen often make mistakes that can lead to failure of the compressor itself. One of the most common mistakes is installing a relay of the wrong power. If you install a relay designed for a lower current, it will burn out the first time you start it. If it is larger, it may not turn off the starting winding, which will lead to the motor burning out.
Another mistake is ignoring the state of the contacts on the compressor itself. If you replace the relay but do not clean the oxidized motor pins, the contact will be poor, sparking and heating will occur, and the new relay will also fail very quickly. Always take time to prepare the seat.
It is also dangerous to leave the refrigerator turned on without control immediately after repair. In the first 15-20 minutes, it is necessary to periodically check the temperature of the relay housing and compressor. If they begin to heat up faster than usual or a cracking sound is heard, the device must be de-energized immediately.
⚠️ Attention: Never try to start the compressor directly, bypassing the relay and thermal protection, even for a short time to “check”. This is guaranteed to lead to a wedge of the engine or a fire.
Do not forget about the capacitor. When replacing a relay, many people forget to check or replace the capacitor, believing that since the relay is new, everything will work. However, the old capacitor may have a changed capacitance, which will disrupt the start-up phase and lead to a hum or the impossibility of starting the motor.
Recommendations for extending the service life
So that replacing the relay is not required in the near future, it is worth providing the refrigerator Pole comfortable operating conditions. First of all, this is the presence of free space around the compressor for ventilation. If the back wall of the refrigerator is moved close to the wall or is curtained, the motor will overheat, which reduces the life of all electrical components.
It is also important to monitor the stability of the voltage in the network. Voltage surges are detrimental to compressor windings and starting equipment. If lights flicker frequently in your home, it is recommended to use a voltage stabilizer or surge protector with surge protection.
Regularly cleaning the back of the refrigerator from dust and pet hair also helps prevent overheating. The dust layer on the condenser (black grille at the back) and on the compressor itself acts as a heat insulator, preventing heat from escaping, which forces the relay to operate in extreme temperature conditions.
How often should you clean the condenser?
Ideally - once a year. If you have pets that shed, you should have them checked every 6 months. Dust can be carefully removed with a soft brush or vacuum cleaner at minimum power.
Following these simple operating rules will allow your refrigerator Polyus to serve for many years without serious breakdowns. Remember that timely diagnostics and high-quality repairs are the key to the long life of household appliances.
Conclusion
Searching and replacing a relay in a refrigerator Polyus is a task that can be solved for a person with minimal technical skills and a set of basic tools. Knowing where this unit is located (on the compressor in the lower rear) and what it looks like, you can quickly diagnose the cause of the lack of cooling. The main thing is to follow safety precautions and choose the right part to replace.
If after replacing the relay the problem does not disappear and the compressor still does not start or quickly turns off, this may indicate more serious malfunctions, such as an interturn short circuit in the motor windings or loss of freon. In such cases, self-repair may be ineffective, and the intervention of a professional technician with specialized equipment will be required.
We hope that this information helped you understand the structure of your refrigerator. Take care of your equipment, and it will respond to you with reliable and stable operation, preserving the freshness of your products.
Is it possible to install a relay from another brand of refrigerator on the Pole?
Yes, it is often possible. The main thing is that the mounting dimensions, the location of the contacts and, most importantly, the current characteristics match. Relays from refrigerators Zil, Sviyaga, Biryusa are often suitable for Pole, since similar compressors were used.
Why does a new relay burn out after a few days?
There may be several reasons: the relay power is incorrectly selected, poor contact at the compressor terminals (oxidation), the compressor itself is faulty (interturn short circuit) or power surges in the network.
How to understand that a posistor inside the relay has burned out?
When tested with a multimeter, a working posistor at room temperature shows a resistance of 5 to 50 Ohms (depending on the model). If the device shows infinity (open circuit) or zero (short circuit), the posistor is faulty.
Is it necessary to change the capacitor along with the relay?
It is desirable, but not necessary. If the capacitor is not swollen, does not leak and its capacity is normal (checked by a tester), it can be left. However, given the low cost, the entire set is often changed for reliability.
Is it dangerous to operate a refrigerator with a faulty relay?
Yes, it is dangerous. A faulty relay can lead to overheating and combustion of the compressor (the most expensive part of the refrigerator), as well as create a risk of fire in the wiring due to sparking contacts.