Refrigerators Stinol have earned a reputation as reliable and durable units, but even time-tested equipment has breakdowns. One of the most common problems that owners encounter is the failure of the compressor start relay. This small but critical element is responsible for starting the engine and protecting it from overloads. If the refrigerator stops turning on, hums, but does not start the compressor, or, conversely, works without stopping, there is a high probability that the relay is to blame.
In most cases, repairs do not require calling a technician and expensive equipment. Independent relay replacement is a procedure accessible to anyone with basic skills in handling tools. The main thing here is compliance with safety precautions and attention to detail, since the work will be with electrical components. In this article, we will look in detail at how to diagnose a malfunction and correctly install a new part.
Before taking active steps, you need to make sure that the problem lies in the starting device. Users often confuse a relay failure with a malfunction of the compressor or thermostat itself. The key sign of a relay failure is a characteristic click when trying to start, followed by a humming sound of the motor, lasting several seconds, after which it turns off. If you observe such a picture, then the probability of success of self-repair is more than 90%.
The principle of operation and types of relays in Stinol refrigerators
The starting relay is an electromechanical switch that supplies current to the starting winding of the compressor only at the moment of startup. As soon as the engine rotor reaches the required speed, the relay opens the starting winding circuit, and the engine continues to operate on the main winding. Refrigerators Stinol most often use inductive relays with or without a posistor, as well as thermal protection relays.
Modern models can be equipped with more complex electronic modules, but classic mechanical devices remain standard for many series. Thermal relay performs a protective function: it opens the power circuit if the current in the windings exceeds permissible limits, preventing engine combustion. Understanding what type of device is installed in your unit will help you choose the right spare part.
- 🔹 Induction relay: works due to the electromagnetic field created by the current of the starting winding.
- 🔹 Posistor relay: uses a semiconductor an element that is heated by current and changes resistance, opening the circuit.
- 🔹 Thermal protection relay: reacts to temperature and current, protecting the compressor from overheating.
It is important to note that visually different models relays may look similar, but have differences in wiring diagram or current characteristics. Therefore, when purchasing a new part, be sure to check the markings. Using an unsuitable component can lead to repeated breakdown or damage to the compressor.
Diagnostics of the malfunction before replacement
Before disassembling the equipment, it is necessary to carry out an initial diagnostics. This will allow you to avoid purchasing extra spare parts if the problem lies in another unit. First of all, check the voltage in the network: it must be stable and meet the norm 220-230 V. Voltage surges often cause failure of starting equipment.
If everything is in order with the network, listen to the operation of the unit. A working refrigerator emits a steady hum of a running compressor with periodic pauses. Faulty relay often produces loud crackling or clicking noises. It is also worth paying attention to the temperature of the compressor housing: if it overheats, but does not start, this is a sure sign that the starting winding does not receive an impulse or the motor is jammed.
⚠️ Attention: Before any diagnostics and disassembly, be sure to disconnect the refrigerator from the power supply! Working with live electrical wiring is deadly.
For a more accurate check, you can use a multimeter. It is necessary to “ring” the relay contacts for breaks or short circuits. The resistance of a working posistor in a cold state is usually several tens of ohms. If the device shows infinity or zero, the part requires replacement.
Necessary tools and preparation of the workplace
Replacing the relay on the refrigerator Stinol does not require complex professional equipment. A set of household tools that most men have is enough. However, the quality and cleanliness of the work directly depend on the preparation. The work area should be well lit so that you can see small parts and wire markings.
You will need tools to remove fasteners and strip contacts. It would also be a good idea to have a means for cleaning the contacts on hand, since over the years of operation, an oxide deposit could have formed on them, impairing conductivity. Pliers and screwdrivers must be in good working order so as not to damage the plastic of the case or the insulation of the wires.
- 🔹 Screwdriver: Phillips or flat, depending on the type of casing fastening screws.
- 🔹 Pliers: for removing terminals and fixing wires.
- 🔹 Multimeter: for checking circuit integrity and diagnostics.
- 🔹 Knife or sandpaper: for cleaning contacts if necessary.
☑️ Preparation for repair
Pay special attention to choosing a new one relay You can find universal models on sale, but for refrigerators Stinol it is better to look for original spare parts or proven analogues, such as Danfoss or Indesit, which are often interchangeable. Make sure that the current characteristics of the new part match the requirements of your compressor.
Step-by-step instructions for removing the old relay
The dismantling process begins with access to the compressor, which is located in the lower rear part of the refrigerator. Remove the protective cardboard or metal panel covering the engine compartment. In some models Stinol you may need to remove the back wall completely or unscrew several screws securing the casing.
After removing the protection, you will see a black cylindrical or pear-shaped compressor. A plastic box is attached to its side (usually on the left or right) - this is the starting relay. It fits directly onto the three contact pins coming out of the compressor housing. Carefully remove the retainer or bend the spring tabs that hold the relay in place.
When removing the relay, be careful: it may be hot if the refrigerator has been running recently. Allow the unit to cool for 15-20 minutes after switching off. Dismantling should proceed without excessive force; if the relay cannot be removed, check whether you forgot to unscrew the mounting screw or remove the additional bracket.
⚠️ Attention: Do not pull sharply on the wires! The contacts can be fragile and there is a risk of the conductors tearing away from the terminals, which will complicate repairs.
What to do if the wires are mixed up?
If you are not sure about the correct connection, take a close-up photo of the wiring diagram before disconnecting the old relay. You can also mark each wire with a marker or electrical tape of the appropriate color so that you don’t make a mistake when installing a new device.
After removing the relay housing, disconnect the wires. Depending on the design, they can be connected through connectors or soldered. If the wires are soldered, you will have to carefully unsolder them, having first marked which wire went to which contact. Most modern models use removable terminals, which greatly simplifies the task.
Installing a new relay and checking operation
Installing a new starting device is done in the reverse order of dismantling. First of all, it is necessary to correctly orient the relay relative to the compressor. On the body of the part there is usually an arrow or an inscription UP (top), which should point straight up. This is critically important, as incorrect positioning may interfere with the operation of the thermal release.
Push the relay onto the compressor contact studs until it stops. Make sure the fit is snug and the contacts fit into the sockets without distortion. Then connect the wires to the appropriate terminals according to the previously made diagram or marking. If you used a universal relay, check the instructions for it, since the location of the terminals may differ from the original.
Secure the relay to the compressor housing using a standard clamp or screw. Reinstall the engine compartment protective cover. Now you can connect the refrigerator to the network. When turned on, you should hear a characteristic startup click and a smooth hum of the running engine.
| Parameter | Normal value | Symptom of malfunction |
|---|---|---|
| Sound at startup | One clear click | Series of clicks or crackling |
| Compressor operation | Smooth hum | Humming with pauses or silence |
| Temperature housing | Warm (40-60°C) | Strong overheating or icy |
| Current consumption | Complies with the passport | Inflated or zero |
Typical mistakes and precautions
When repairing refrigerators on their own Stinol beginners often make a series of mistakes that can ruin all your efforts. One of the most common is ignoring the orientation of the relay during installation. As mentioned earlier, a thermal relay operates on the basis of gravity or specific heat exchange, so the position UP must be strictly observed.
Another mistake is using a relay with an inappropriate operating current. If you install a part with a lower current, it will constantly knock out, preventing the compressor from starting. If it is large, the protection will not work if there is an overload, which can lead to burnout of the motor windings. Marking on the body is your main reference.
- 🔹 Ignoring cleanliness: moisture or dust getting inside the relay mechanism is unacceptable.
- 🔹 Weak contact: poorly dressed terminals will heat up and melt.
- 🔹 Mechanical damage: impacts on the relay body can disrupt the calibration of internal elements.
⚠️ Attention: If, after replacing the relay, the compressor hums for 3-5 seconds and turns off, immediately turn off the refrigerator. This may mean a jammed compressor or an interturn short circuit, and further attempts to start will kill the motor.
It is also worth remembering that technical specifications and availability of spare parts may change. Always check the compatibility of a specific relay model with your modification of the refrigerator at the time of purchase, since manufacturers may make changes to the design without notice.
Frequently asked questions (FAQ)
Is it possible to replace the relay on a Stinol refrigerator with a universal analogue?
Yes, in many cases this is possible. Universal relays (for example, PZR series or imported analogues) are suitable for most single-phase compressors. The main thing is that the current characteristics and the connection diagram match. However, original spare parts Stinol or Indesit are preferable, since they are guaranteed to fit the mounting geometry.
Why does a new relay burn out a short time after replacement?
Most often the reason lies not in the relay itself, but in a malfunction compressor. If the motor has an inter-turn short circuit or jammed bearings, it consumes increased current, which melts the relay contacts. Also, the cause may be unstable voltage in the network or poor contact at the junction of the wires.
How long does it take to replace a relay with your own hands?
For an experienced technician, this procedure takes 10-15 minutes. For a beginner who is new to disassembling equipment, the process may take 30-40 minutes, including time for diagnostics, searching for tools and carefully disconnecting wires. The main thing is not to rush and act carefully.
Is it necessary to charge freon after replacing the relay?
No, replacing the start relay does not require opening the refrigeration circuit. Freon remains inside the system, so additional charging or evacuation is not required. You work only with the electrical part of the unit.