Sudden cessation of operation of the refrigerator Biryusa often becomes an unpleasant surprise, especially when perishable food remains inside. In most cases, the unit does not turn on at all or makes a characteristic clicking sound, followed by a humming sound, but no cooling occurs. It is these symptoms that most often indicate problems with the start-protection relay, which is responsible for starting the compressor engine.
Before calling a technician or preparing for complex repairs, you should try to independently diagnose the condition of this small but critical unit. Start relay is a device that supplies increased current to the starting winding of the engine at the moment of starting, and then turns it off. If this mechanism fails, the compressor simply cannot start, remaining blocked.
Understanding the principle of operation and the ability to carry out a basic check will help you save significant money on calling a specialist. In this article we will look in detail at how to determine the malfunction, what tools will be needed and what to pay attention to when inspecting the contacts.
The operating principle and design of the starting relay
In order to carry out a quality diagnosis, you need to understand exactly how this unit functions in brand refrigerators Biryusa. Inside the relay housing there is an inductor through which the current of the main winding of the motor passes. When the current reaches a certain value, the magnetic field of the coil draws in the core, which closes the contacts that supply voltage to the starting winding.
After the motor rotor begins to rotate and picks up speed, the current in the circuit drops. This leads to the opening of the contacts of the starting winding, and the engine continues to operate on the main winding. Some models use thermal protection, which opens the circuit when the compressor overheats. Malfunction any of these elements leads to a stop in the cooling cycle.
Structurally, the relay can be made in the form of a separate block, placed on the three contact pins of the compressor, or be integrated into the overall circuit control, although in classic models Biryusa the first option is more common. Knowledge of the device helps to correctly interpret the test results.
A visually serviceable relay should not have traces of soot, melted plastic or corrosion on the contacts. Any changes in the color of the plastic indicate that overheating has occurred inside, which is a sure sign of the need to replace the part.
Symptoms of a faulty compressor relay
You can determine if a relay is broken not only by disassembling it, but also by the characteristic signs in the operation of the refrigeration unit. If you notice that the refrigerator Biryusa has stopped freezing, but the light in the chamber is on, this is the first signal to check the electrical circuit.
Often the malfunction is accompanied by specific sound signals. The compressor may try to start, make a hum, but immediately stall with a loud click. This means that the starting pulse is not generated, or the thermal protection instantly turns off the power due to a short circuit in the circuit.
⚠️ Attention: If you hear clicking sounds every 10-20 seconds, do not leave the refrigerator plugged in for a long time. Frequent attempts to start can lead to burning of the windings of the compressor itself, which will make repairs economically unfeasible.
Another symptom is heating of the compressor housing in the absence of cold. If the motor hums but does not start, it begins to consume short circuit current and quickly heats up. In this case, the thermal relay should work, but if it is also faulty, the situation becomes dangerous.
- 🔊 The refrigerator makes a loud click, but does not start or stalls immediately.
- 🔥 The compressor housing gets very hot, although the temperature in the chamber does not drop.
- ❄️ Complete absence of cold with working lighting and a working socket.
- ⚡ Triggering of circuit breakers in the electrical panel when the refrigerator is turned on.
Sometimes the cause may not be the relay itself, but a jammed compressor. In this case, even a working starting device will not be able to start the engine, and the diagnostics must be comprehensive. However, statistics show that it is the relay that fails most often due to power surges in the network.
Visual inspection and primary diagnostics
The first stage of testing should always be a thorough visual inspection. To do this, you need to remove the back metal panel of the refrigerator Biryusato gain access to the compressor. It is usually secured with several bolts or latches.
Remove the plastic casing covering the compressor contacts. The relay is placed directly on the contact group. Carefully disconnect it, after taking a photograph or remembering the wiring diagram. Pay attention to the condition of the contacts: they must be clean, without oxides and carbon deposits.
☑️ Initial inspection of the relay
If inside the relay case you see traces of burning, blackened plastic or smell burnt insulation, further checking with a multimeter may be unnecessary - the part requires replacement. Also check the integrity of the wires going to the relay: they should not be frayed or melted.
In some cases, the problem lies in the oxidation of the contacts on the compressor itself. If the pins have a greenish or black coating, they can be carefully sanded with fine sandpaper before installing the new relay. This will ensure better contact and extend the service life of the new part.
Checking the relay with a multimeter (continuity)
The most accurate diagnostic method is to check the electrical resistance with a multimeter. To do this, the device is switched to resistance (Ohm) or continuity measurement mode. First you need to determine the type of your relay: it can be with an inductive coil or with a posistor (thermistor).
If the relay is inductive, check the integrity of the coil. The resistance should be within normal limits (usually from 30 to 200 Ohms, depending on the model). If the device shows infinity (open) or zero (short circuit), the coil is faulty. Also check the moving contact: in the “resting” position it should close the starting winding circuit.
For a relay with a posistor, the check is a little more complicated, since the posistor has a low resistance at room temperature, and high resistance when heated. Ring the conclusions: if the resistance goes to infinity immediately, the posistor has burned out. If there is resistance, but the relay does not click when voltage is applied, the opening mechanics may be broken.
| Test type | Normal reading | Fault symptom | Action |
|---|---|---|---|
| Coil continuity | 30-200 Ohm | Infinity or 0 Ohm | Relay relay |
| Contacts at rest | 0 Ohm (closed) | Infinity (open) | Cleaning or replacement |
| Posistor (cold) | Low resistance | High resistance | Replacing a posistor |
| Thermal protection | 0 Ohm (circuit intact) | Infinity (break) | Replacing protection |
When checking the thermal protection, make sure that it is “cold”. If it is hot, let it cool for 15-20 minutes. When cold, it should ring briefly. If the circuit is broken even in a cold state, the protection has burned out and requires replacement along with the relay.
Replacement and selection of analogues for Biryusa
If the diagnostics show a malfunction, the relay must be replaced. For refrigerators Biryusa relays of the RT, R-3 series or their modern analogues are often used. It is important to select a part taking into account the power of the compressor and the type of refrigerant, although for household models the differences are often minimal.
When purchasing, pay attention to the markings. Older relays may be discontinued, but full functional equivalents can be easily found in parts stores. The main thing is that the fit dimensions and contact locations match. In some cases, you have to slightly bend the contact pads for a tight fit.
The installation process is simple: the new relay is put on the contact group of the compressor until it clicks or stops. Then the wires are connected according to the previously made diagram or color marking. Typically color coding is used, with red, white or black wires connected to the corresponding terminals.
⚠️ Warning: Do not attempt to repair a burnt out relay by stripping the contacts or rewinding the coil. Such measures have a temporary effect and can lead to a fire. Use only new certified components.
After installation, plug in the refrigerator. The compressor should start the first time and run smoothly, without humming or vibration. If the start-up was successful, you can install the back cover and operate the unit as usual.
Can a universal relay be used?
Yes, there are universal starting relays that are suitable for most compressors. They have flexible contacts and a wide power range. However, for long service, it is better to look for an original analogue or a specialized model for your type of compressor (for example, R600a or R134a).
Frequent errors in diagnostics and repair
One of the most common mistakes is ignoring the condition of the compressor itself. If a relay burns out, it is often a consequence, not a cause. For example, the compressor could jam, the current increased, and the relay burned out, protecting the windings. Installing a new relay on a jammed motor will cause the new part to instantly burn out.
Also, amateur craftsmen often forget to check the capacitor, if there is one in the circuit. On some models, a starting capacitor helps start the engine. If it is swollen or has lost capacity, the relay will work in emergency mode, constantly click and heat up.
- 🚫 Trying to start “directly” without a relay can kill the compressor.
- 🚫 Ignoring checking the voltage in the network (norm 220V ± 10%).
- 🚫 Installing a relay from a different type of compressor without checking the parameters.
Another error is poor wire contact. If you twist the wires together instead of using clamps or electrical tape, the connection will get hot, causing it to break again. Use high-quality connectors and heat shrink.
Prevention and extension of service life
In order for the compressor relay of your refrigerator Biryusa to serve for a long time, it is important to ensure stable operating conditions. The main enemy of electronics and electricians is power surges. Installing a voltage stabilizer or at least a surge protector with overload protection will significantly reduce the risk of failure.
Regular cleaning of the back wall of the refrigerator from dust and animal hair is also important. The compressor must be effectively cooled by air. If it overheats due to a layer of dust, the thermal relay will operate more often, which reduces its life.
Do not forget that frequently opening the door and loading warm products causes the compressor to work under overload. This leads to increased current consumption and load on the starting system. Compliance with operating rules is the best prevention of breakdowns.
If you notice that the relay begins to click more often than usual, do not expect a complete failure. Perform preventative contact testing and cleaning. Timely maintenance is cheaper and easier than urgent repair or replacement of the compressor.
Why does the relay click, but the refrigerator does not turn on?
The click means that the thermal protection or the relay itself is trying to start the compressor, but the current is too high, and the protection opens the circuit. This may be due to jamming of the compressor, an interturn short circuit in the windings, or a malfunction of the relay itself. Diagnostics with a multimeter is required.
Is it possible to start a refrigerator without a relay?
Theoretically, you can start it by applying voltage to the starting winding manually, but this is dangerous and requires qualifications. You cannot operate a refrigerator without a relay: it will not automatically turn off the starting winding, which will lead to the engine burning out in a few minutes.
Where can I find the number of a replacement relay?
The model number is usually indicated on the body of the relay itself or on a sticker. If the marking is erased, look for an analogue in terms of compressor parameters (power, type of refrigerant) or contact a service center with the model of your Biryusa refrigerator.
How much does it cost to replace the relay?
The cost of the relay itself varies from 500 to 1500 rubles, depending on the model and manufacturer. The work of a replacement specialist usually costs from 1000 to 2000 rubles. Self-replacement saves the cost of work.