A sudden stop in the refrigerator is always stressful, because food supplies are at risk. Most often, the cause of a breakdown is not the compressor itself, but its “starter” - the starting relay. It is this small unit that supplies an electrical impulse to start the engine, and if it fails, the engine hums, but does not start or is completely silent.
Fortunately, replacing this part does not require calling a technician or expensive equipment. In most cases refrigerator relay repair you can do it yourself, having only a basic set of tools at hand. Understanding the principle of operation of the device will help you save a significant amount and quickly bring the equipment back to life.
Before starting disassembly, it is important to make sure that the problem lies precisely in the trigger mechanism, and not in the absence of voltage in the network or a break in the internal wire. If you hear a characteristic clicking or humming of the motor, which ends abruptly, then with a high degree of probability the hero of the occasion is the starting relay.
The principle of operation and types of starting devices
To perform it efficiently Replacing the relay, you need to understand how it works functioning. The main task of the device is to briefly apply voltage to the starting winding of the compressor in order to create a torque sufficient to accelerate the rotor. As soon as the engine reaches the required speed, the relay opens the starting winding circuit, and the motor continues to operate on the main one.
There are two main types of devices that are used in modern and old technology. The first type is inductive (electromagnetic) relays, which are often found in older models of refrigerators Indesit or Atlant. They work by attracting the core with current and opening the contacts when the bimetallic plate is heated.
The second, more modern type is posistor relays. There are no moving mechanical contacts in their design. Posistor It is a ceramic element, the resistance of which increases sharply when heated by current, which actually breaks the starting winding circuit. Such devices are considered more reliable, but are also subject to wear.
You can determine the type of your device visually after removing the back panel of the compressor. If you see a copper coil and a moving core inside the plastic case, this is an electromagnetic mechanism. If there is a ceramic tablet there, you have a posistor model.
Fault diagnosis: signs and symptoms
The humming of a refrigerator does not always mean a relay failure, so it is important to carry out proper diagnostics. The most obvious sign of a problem is when the compressor tries to start, makes a short beep, and then there is a clicking sound and there is silence. This cycle can be repeated at certain intervals.
Another alarming symptom is heating of the relay itself or the compressor housing. If you touch the back of the refrigerator and feel intense heat in the motor area, this may indicate that starting device the circuit is not opening, and the starting winding is running idle, overheating.
Sometimes the refrigerator may turn on, but work intermittently, often turning off. This is typical when the contacts inside the relay are burnt or oxidized, creating high resistance. In such cases, the motor does not receive enough power for stable operation.
⚠️ Attention: If after clicking the relay the compressor continues to hum and does not start for more than 5-10 seconds, immediately unplug the refrigerator! Long-term operation in this mode can lead to burnout of the motor windings, which will make repairs economically unfeasible.
It is also worth paying attention to the appearance of the part. If during a visual inspection you notice traces of burning, melted plastic or blackening of the contacts, then replacement of the compressor relay it is inevitable, since such elements can no longer be restored.
Necessary tools and preparation for repair
For successful work you will not need you will need a complex professional tool. A standard DIY kit is sufficient. The main thing is to ensure safety and access to the unit.
First of all, prepare the following tools:
- 🔧 Screwdrivers (flat and Phillips) for removing protective panels.
- 🔌 Pliers or pliers for carefully removing terminals.
- 🧤 Dielectric gloves for protection against electric shock.
- 📸 Smartphone for photographing the connection diagram before disassembling.
Before starting any manipulations, be sure to disconnect the refrigerator from the power supply. Unplug the unit and move the unit away from the wall to allow easy access to the rear. Remove the cardboard or plastic cover that covers the compressor; it is usually secured with latches or several screws.
It is important to choose the correct relay for a refrigerator replacement one. Old parts may have markings that are no longer produced, but they always have modern analogues. It is best to remove the old relay and go to the store with it to pick up one that is identical in terms of landing pins and electrical characteristics.
Step-by-step instructions for replacing the relay
The replacement process does not require special technical knowledge, but it does require attentiveness and accuracy. Follow the instructions sequentially to avoid damaging other components of the refrigerator.
First remove the old device. It is usually placed on the three pins of the compressor and secured with a metal bracket or plastic latches. Carefully bend the bracket with pliers or press the latches, then remove the relay down, releasing the contacts.
Next you need to disconnect the wires. Before doing this, it is strongly recommended to photograph the location of the wires so that when installing a new device you do not mix up the polarity. Usually the wires are simply removed from the terminals, but in some models they can be soldered.
☑️ Relay replacement checklist
Installation of the new element is carried out in the reverse order. Place the relay on the compressor pins exactly in the position in which the previous one was installed (usually marked “Up” or the arrow points upward). Then connect the wires according to the photos taken earlier.
After assembly, turn on the refrigerator and listen. The motor should start the first time, without a long hum or repeated clicks. If the startup was successful, you can install the protective cover in place.
⚠️ Attention: Some relay models have a strictly defined installation position. If you turn the device upside down, it may not work or burn out in the first seconds of operation. Always focus on the markings or position of the old element.
Compatibility and markings table
When searching for a spare part, you may encounter different designations. Manufacturers use different codes, but the principle of operation of their analogues is the same. Below is a table of correspondence between popular models.
| Refrigerator type | Original marking | Analogue / Replacement | Compressor power |
|---|---|---|---|
| Atlant, Minsk | RTP, R-3 | RTP-3, RTK-3 | 1/5 - 1/4 hp |
| Indesit, Ariston | 620.003 | R620, PTC 17 Ohm | 1/6 - 1/5 hp |
| Biryusa, Oka | R-1, R-2 | RTK-1, RTK-2 | 1/8 - 1/6 hp |
| LG, Samsung | PTC Relay | Universal 3-pin | 1/4 - 1/3 hp |
Please note that starting relay must correspond not only to the seats, but also to the current characteristics. If you install a device designed for a lower current, it will constantly turn off the compressor. If it is larger, it may not break the starting winding circuit.
Modern universal kits often contain replaceable inserts for adjustment to different currents. This allows you to use one device for a wide range of compressors, which simplifies do-it-yourself refrigerator repair.
Is it possible to repair an old relay?
Theoretically, an electromagnetic relay can be disassembled, the contacts can be cleaned with fine sandpaper and put back together. However, the seal of the case will be broken, and the service life of the restored contacts will be at most several weeks. PTC relays cannot be repaired in principle.
Common mistakes and precautions
Beginners often make mistakes that can lead to repeated breakdowns. One of the most common is ignoring the condition of the compressor. If the motor is difficult to crank or has an interturn short circuit, the new relay will burn out in the same second.
You can check the compressor by applying voltage to it directly (bypassing the relay) for a short time. If the motor shaft rotates freely and with a characteristic sound, then the problem is definitely in the starting device. If the motor hums and stands still, the problem is deeper.
It is also a mistake to install the relay “at random” without checking the contacts. Oxidized terminals on wires can produce high resistance, which will cause the new device to heat up and melt. Clean the wire contacts before installation.
⚠️ Attention: Technical specifications and connection diagram may vary depending on the specific modification of the refrigerator. Always check the technical documentation or the markings on the nameplate of your unit before purchasing spare parts.
Do not forget about safety precautions. The compressor is under high voltage 220 Volts. All work on connecting and disconnecting wires should be carried out only with the device completely disconnected from the network.
Questions and answers (FAQ)
Is it possible to start a refrigerator without a relay?
You can start a compressor for a short time without a relay by applying voltage directly to the starting winding, but you cannot operate the refrigerator in this mode. Without a protective mechanism, the compressor will burn out at the first overload or power surge.
Why does a new relay burn out immediately after installation?
This is a sure sign of a malfunction of the compressor itself. Most likely, the piston is jammed or an inter-turn short circuit of the windings has occurred. In this case, replacement of the compressor or its complex professional repair is required.
How to distinguish a posistor relay from an electromagnetic one?
An electromagnetic relay is heavier, inside you can hear the sound of a rolling core when shaking, and it has a coil. A posistor is lighter, there is a ceramic element inside, and nothing rattles when shaken.
Where can I find the relay markings?
The marking is usually applied to the side or top of the plastic case. Also, information about the type of relay is often duplicated in the technical documentation of the refrigerator or on a sticker with characteristics.