Refrigerators of the Okaseries, including the popular model Oka 6, have earned a reputation as reliable and durable units that can operate for decades. However, even the highest quality equipment requires intervention over time, and one of the most common causes of failure is the compressor start-up relay. Owners are often faced with a situation where the engine hums, but does not start, or does not show signs of life at all, and the first thing that arises is the location of this important element.
Searching for a relay in Oka 6 refrigerator does not require calling a technician home, since this unit is located in an accessible place, directly on the compressor housing. Understanding the design and precise knowledge of the algorithm of actions will allow you to independently diagnose and, if necessary, replace the failed part. In this article, we will look in detail at where exactly to look for a relay, how to distinguish a working device from a faulty one, and what to pay attention to when carrying out repair work.
Before starting disassembly, it is important to ensure safety and prepare the workplace. You should not ignore the basic rules of electrical safety, because you will be working with an electrical appliance connected to the network. The starting relay in Oka 6 is often labeled as RTK-X or PZR, which is important to consider when purchasing a new part. Let's look at the whole process step by step to eliminate errors.
Signs of a faulty start-up relay
You can determine that the problem lies in the relay by the characteristic sounds and behavior of the motor. Most often, the malfunction manifests itself in the form of clicks that are repeated with a certain frequency. The compressor tries to start, a loud click is heard, but the engine does not pick up speed and after a while the protection switch off click is heard again.
In some cases, you may notice that compressor gets very hot, and the refrigerator stops freezing. This happens because the starting winding does not receive a short-term impulse to start, and the motor hums idle. If you leave the equipment in this state for a long time, there is a risk of the engine itself burning out or the wiring melting.
Sometimes the relay can “stick” in the closed state, which leads to continuous operation of the compressor without stopping. This is also a sign of a breakdown, although it is less common. In such a situation, the refrigerator can work without interruption, severely overcooling the food or, conversely, not being able to cope with the load due to a violation of the cycle.
⚠️ Attention: If you hear constant clicking sounds, immediately unplug the refrigerator. Prolonged operation in the “starting hum” mode can lead to irreversible damage to the compressor windings.
Location of the relay in the design of the Eye 6
To find the relay, you do not have to disassemble the entire refrigerator. In the model Oka 6, as in most classic refrigerators, this element is installed directly on the side of the compressor, which is located in the lower rear part of the unit. It is accessed through the back panel or simply by moving the refrigerator away from the wall.
The compressor is a black metal “tank”, to the bottom of which a copper tube and electrical wires fit. The relay is placed directly on the contact rod of the compressor and is covered with a plastic or metal casing. Protective casing can be mounted with latches or screws, which must be taken into account during dismantling.
Inside the casing you will see the relay box itself, to which the harness fits wires Often, next to the starting relay there is also a thermal protective relay, which can be combined with it in one housing or located separately. Visually, this is a small rectangular or cylindrical part, usually black or white.
Instructions for removing and dismantling the relay
The process of removing the relay requires care and attention. The first step is to completely turn off the power to the refrigerator by removing the plug from the socket. Then you need to gain access to the back of the unit, moving it away from the wall at a comfortable distance for work.
Next you should proceed according to the following algorithm:
- 🔌 Disconnect the connector with the wires going to the relay, having first remembered or photographed the color marking of the wires.
- 🛠️ Remove the casing fixing element (screw or latch) and carefully remove the casing, opening access to the insides.
- 🧩 Remove the relay from the compressor rod. It may fit tightly, so wiggle it slightly from side to side, but do not use excessive force to avoid damaging the contacts.
- 🔍 Inspect the inside of the relay for melting, carbon deposits, or a characteristic burning odor.
Usually the relay body will have a top/bottom marking or an arrow indicating the correct position. position. Incorrect installation can lead to a short circuit or failure to start.
☑️ Checklist before dismantling
Diagnostics and performance check
After removal the relay needs to be checked. The easiest way is visual inspection. If carbon deposits, melted plastic, or a burning smell are visible inside the housing, the part definitely requires replacement. However, the external condition does not always indicate an internal malfunction.
For more accurate diagnostics, you can use a multimeter. It is necessary to “ring” the contacts for breaks or short circuits. In normal condition, the resistance should be close to zero or correspond to the values specified in the technical documentation. If the device shows infinity or, conversely, zero where it should not be, the relay is faulty.
It is also worth checking the thermal relay if it is placed separately. It should “ring” when cold and open the circuit when heated. Often in refrigerators Oka it is the starting part that fails, where the nichrome spiral burns out or the contacts stick.
Is it possible to repair an old relay?
In some cases, if the relay is dismountable, you can carefully clean it contacts with fine sandpaper. However, this is a temporary measure: the reliability of the contact is impaired, and after a short time the breakdown will occur again. It is better to immediately install a new unit.
Compatibility and relay characteristics table
When purchasing a new part, it is important to know not only the model of the refrigerator, but also the parameters of the compressor itself. In refrigerators Oka 6 different modifications of motors could be used, so a visual comparison of the old and new parts will not be superfluous.
| Relay type | Marking | Compatibility | Features |
|---|---|---|---|
| Starting | RTK-X | Refrigerator compressors | Induction, requires strict orientation |
| Start-protective | PZR | Oka, Biryusa, Saratov | Combines start-up and protection functions |
| Thermal | TP | Universal | Responses to current and temperature |
| Combined | RT | Modern models | Compact housing, high reliability |
Pay attention to the diameter of the compressor rod and the location of the contacts. Even if the markings are the same, the geometric dimensions may differ. Universal relays may require additional adaptation or may not be suitable for mounting.
⚠️ Attention: The technical characteristics of compressors in different years of production of the Oka 6 model may have differed. Always check the markings on the motor nameplate with the data on the new relay before purchasing.
Installing a new relay and first start-up
The process of installing a new part is performed in the reverse order. Carefully push the relay onto the compressor rod as far as it will go, making sure it is seated evenly and tightly. It is important to observe the orientation: on the case there is often an arrow or the inscription “UP” (top), which should face up.
Connect the connector with the wires, making sure that the contacts fit into the grooves until they click. Replace the protective cover and secure it. Only after all elements have been completely assembled can you turn on the refrigerator.
When starting up for the first time, listen carefully to the operation of the unit. The engine should start with a characteristic hum, without unnecessary clicks or vibrations. If the start-up was successful, the compressor should work until the temperature reaches a temperature and automatically turn off.
Common mistakes when replacing a relay
One of the most common mistakes is ignoring the orientation of the relay during installation. Induction starting relays work on the principle of gravity: the core must fall and close the contacts under its own weight. If you install the relay upside down, it simply will not work.
Another mistake is trying to install the relay without checking the condition of the compressor. If the motor has an inter-turn short circuit or jamming, the new relay will burn out almost instantly. Therefore, if after replacement the problem does not disappear, it is worth checking the engine yourself engine.
Also, craftsmen often forget to secure the casing, leaving the contacts open. This is dangerous not only due to the risk of electric shock, but also due to the possibility of moisture or dust entering, which will lead to a short circuit. Always complete the repair by completely assembling the protection.
Prevention and care of the starting system
In order for the relay and compressor to last longer, it is necessary to ensure good ventilation in the rear of the refrigerator. Do not move the unit close to the wall, leave a gap of at least 10 cm for air circulation. Overheating is the main enemy of electrical components.
Regularly wipe the back panel from dust. A thick layer of dust on the compressor and radiator grill causes the motor to work with increased load, which increases current consumption and accelerates the wear of the starting equipment. Cleaning rear wall once every six months will significantly extend the life of the equipment.
Make sure the voltage in the network is stable. Voltage surges can damage not only the relay, but also the compressor windings. If the lights flicker frequently in your home, consider installing a voltage stabilizer.
How to extend the life of a compressor?
Do not put hot foods in the refrigerator and do not open the door unless necessary. The less often the motor turns on, the longer the starting elements last.
Frequently asked questions (FAQ)
Is it possible to start an Oka 6 refrigerator without a relay?
Theoretically, you can start a motor without a relay by applying voltage directly to the starting winding, but this is dangerous and requires qualifications. Without a protective relay, the compressor may burn out if it jams. It is strictly not recommended to operate a refrigerator without a relay.
Why does the new relay burn out after a short time?
If the new relay burns out quickly, then the reason is not in it, but in the compressor. There may be problems with the windings (interturn short circuit) or mechanical jamming of the piston group. Motor diagnostics are required.
Where to buy a relay for an old Oka refrigerator?
Relays of the RTK-X and PZR types are common and are sold in spare parts stores for household appliances, on radio markets and in online stores. When purchasing, be sure to take the old relay with you for comparison.
How much does it cost to replace a relay in the service?
The cost consists of the price of the part and the work of the technician. Since replacing a relay is a quick procedure, the markup for the work can be significant. Self-replacement saves up to 70% of the repair cost.