Refrigerators Biryusa are deservedly famous for their reliability and ability to work for many years even under unstable voltage conditions. However, like any complex equipment, they are not immune to breakdowns, and one of the most common causes of compressor failure is the failure of the start-up relay. If your unit hums but does not start, or, conversely, turns on for a couple of seconds and immediately clicks, the problem with a 90% probability lies in this particular unit. Self-diagnosis does not require complex equipment, but it does require care and compliance with safety measures.
Before proceeding with disassembly, it is necessary to completely de-energize the device. Unplug the power cord from the outlet to eliminate the risk of electric shock. Start relay is a compact unit that is responsible for starting the engine and protecting its windings from overheating. Models Biryusa most often use induction or posistor devices, and the methodology for testing them may differ slightly. Understanding the principle of operation will help you quickly find a fault and avoid unnecessary costs of calling a technician.
In this article we will analyze in detail the algorithm of actions that will allow you to accurately determine the condition of the part. We will look at visual signs of damage, methods of checking with a multimeter and the nuances of replacing a component. It is important to know that in older models relays often fail due to natural wear of the contacts, while in new ones the cause may be a power surge. If you are ready to work, prepare a screwdriver and a tester.
Typical signs of a faulty starter
The first step in diagnosis is always an analysis of the symptoms. The refrigerator Biryusa itself “reports” a problem long before the ice in the chamber completely melts. If the compressor tries to start, emits a dull hum or a characteristic click, but immediately goes silent, this is a sure sign that the starting impulse does not pass or the engine is blocked by protection. Sometimes the unit can work normally for several hours, and then suddenly stop, requiring a long rest to cool down.
Pay attention to the behavior of the indicator lights if your model is equipped with them. A flashing lamp or a change in color of the temperature indicator often correlates with attempts to start the engine. It is also worth listening to the sounds: if the relay clicks too often (every 10-15 seconds), this indicates that the thermal release is triggered almost instantly. Thermal protection in such cases, it simply does not allow the engine to gain speed.
Visual inspection can also provide a lot of information. If you have already reached the assembly and see melted plastic, blackened contacts, or smell a burning smell, further checking with a multimeter may be unnecessary - the part definitely requires replacement. However, if there are no external defects, this does not guarantee the serviceability of the internal mechanics or electrical characteristics of the posistor.
⚠️ Attention: If, after clicking the relay, the compressor hums for more than 5-7 seconds and does not start, immediately disconnect the refrigerator from the network. Leaving the motor in blocking mode for a long time (when the shaft does not rotate and current flows) leads to burnout of the windings and expensive repairs.
Removing the relay and preparing for testing
To access the starting device in refrigerators Biryusa usually it is not necessary to disassemble the entire unit. The compressor is located at the lower rear of the housing, and the relay fits directly onto its contact rod. You will need a Phillips screwdriver to remove the protective cover, if equipped, and pliers to carefully remove the retaining brackets. Before starting work, make sure you are in a well-lit area.
The removal process requires caution, as the plastic housings of old relays can be fragile. First, remove the retaining bracket or bar that holds the unit to the compressor housing. Then gently pull the relay down, removing it from its three contact pins. Do not use excessive force: if the part does not fit, check whether you forgot to remove any additional fasteners or wires.
After removing the device, inspect it from all sides. There must be markings on the housing indicating the type of relay (for example, RT, R-1, R-2 or more modern analogues). This information is critical when searching for a replacement. Also check the condition of the contact group inside: if it is possible to carefully open the case, assess the condition of the moving contacts. Carbon deposits or oxidation may be the cause of poor contact.
☑️ Checklist before checking
Visual diagnostics and integrity check
Before picking up the multimeter, conduct a thorough visual inspection. In induction relays, which are often found in classic models Biryusa, an important element is a movable core and contacts. If, when you shake the device, you hear a knocking sound of a part coming off inside, then the relay is faulty. The mechanical integrity of the structure is the key to proper operation.
Inspect the contacts for traces of sparking. Black spots or deposits on the surface of the copper increase resistance and can prevent inrush current from flowing. For cleaning, you can use fine sandpaper or a needle file, but this must be done extremely carefully so as not to disturb the geometry of the contact pad. In modern posistor models, it is more difficult to visually determine a malfunction, since there are no moving mechanical parts.
Pay special attention to the wires going to the relay. They should not have melted insulation or cracks. If the wiring is in order, you can proceed to the instrumental test. Remember that starting winding and the working winding of the motor are connected through different relay contacts, and a violation of the circuit anywhere will lead to the compressor stopping.
Why do the contacts turn black?
Blackening of the contacts usually occurs due to a spark jumping at the moment opening the circuit. This is a natural process, but with frequent voltage surges or spring wear, the contacts can become so burnt that they stop conducting current. In such cases, cleaning gives only a temporary effect, and it is better to replace the relay.
Instrumental testing with a multimeter
The most accurate diagnostic method is to test the circuit using a multimeter. Switch the device to resistance measurement mode (Ohm) or circuit continuity test mode (audible mode). To test a posistor relay (which looks like a plastic box with no moving parts), you need to measure the resistance between the contacts. When cold, it should be several tens of ohms (usually 20-60 ohms). If the device shows infinity or zero, the posistor is faulty.
With inductive relays the situation is more complicated, since their operation depends on current. It is possible to ring the power circuit in a static position, but this will not give a 100% guarantee. However, you can check the thermal protection, which is often built into the relay housing or comes as a separate tablet. The resistance of a working thermal protection should be close to zero. If the multimeter shows an open circuit, the protection has burned out or is in an open state.
To fully test the induction relay, it is sometimes necessary to connect it in series with an incandescent lamp and apply voltage, but this is dangerous for an unprepared user. It is safer to focus on the resistance of the windings of the compressor itself, which is checked through the relay contacts. Make sure that there is no short circuit to the case. Insulation resistance Should be high, ideally - tend to infinity.
| Relay type | Normal resistance | Symptom malfunction | Action |
|---|---|---|---|
| Posistor (PT) | 20–60 Ohm | Infinity or 0 Ohm | Replacement |
| Thermal protection | 0 Ohm (closed) | Open circuit (infinity) | Replace or wait for cooling |
| Induction (P-1, P-2) | Depends on the coil | Coil breakage or sticking | Replacing or cleaning contacts |
| Compressor contacts | 10–40 Ohm (between windings) | Short to housing | Compressor repair |
Compatibility table and Biryusa relay codes
Refrigerators Biryusa have been produced for decades, and during this time various types of starting devices have been installed in them. Understanding the labeling will help you find the exact equivalent in the store. The most common relays are the RT series (posistor) and the P series (induction). It is important not to confuse them, since they have different principles of operation and connection diagrams.
Below is a table with the main types of relays that can be found in household appliances of this brand. Please note that some modern analogues may have different markings, but be fully compatible in terms of electrical characteristics and mounting geometry.
When searching for spare parts in online stores, use not only the name of the refrigerator, but also the markings of the old relay. This will significantly increase the chances of a successful repair. If there is no exact analogue, you can choose a universal relay, but this will require knowledge of the current strength of the compressor.
Replacement and installation of a new component
The process of installing a new relay is the reverse of the dismantling process, but has its own nuances. First of all, make sure that the new device has completely cooled down (if you tested it under voltage) and is of the correct type. Push the relay onto the contact pins of the compressor until it stops. It should fit tightly and not wobble. Incorrect installation can lead to poor contact and repeated failure.
Connect the wires according to the diagram you photographed during disassembly, or according to the color coding. Typically, the blue wire goes to one pin, the brown or black wire to the other, and the ground (yellow-green) is attached to the case. Make sure that the wires are not pinched and do not touch the hot parts of the compressor. Connection diagram must be followed as accurately as possible.
After assembly, plug in the refrigerator. In the first seconds, you may hear a louder hum than usual until the system returns to operating mode. If the compressor starts smoothly, without strong jerks or repeated clicks, and after 10-15 minutes cold appears in the freezer, the repair can be considered successful. Let the unit operate for several hours without loading food.
⚠️ Attention: Technical characteristics of compressors and relays may vary slightly depending on the year of manufacture and the specific modification of the refrigerator. Before installation, check the marking of the new part with the data on the nameplate of your device or consult with the seller of spare parts.
Frequently asked questions (FAQ)
Can an old relay be repaired, or is only replacement necessary?
In most cases, repair is impractical. PTC resistors are disposable elements and cannot be restored. Induction relays can theoretically be cleaned, but their service life after this will be unpredictable, and the cost of a new part is low. It is more reliable and safer to make a complete replacement.
Why does a new relay burn out a short time after installation?
This may indicate problems with the compressor itself (interturn short circuit, jamming of the piston group) or unstable voltage in the network. If the compressor draws too much current, it will quickly damage even new protection. It is recommended to check the current consumption with clamps.
Where can you find the relay markings on the Biryusa refrigerator?
The markings are applied directly to the relay body (usually on the side or top). Also, information about the type of starting device used can be found in the technical documentation for the refrigerator or on the service stickers inside the chamber, although the parameters of the refrigerant and compressor are often indicated there.
Is it safe to operate a refrigerator with a faulty relay?
No, it is dangerous. A faulty relay can lead to overheating and fire of the wiring, as well as the final failure of an expensive compressor. At the first signs of unstable operation, it is better to turn off the unit until repairs are carried out.