The situation when your Biryusa refrigerator stops turn on, and the compressor does not make a sound, always takes you by surprise. Unlike cases when the engine hums but does not start, complete silence of the unit often indicates a break in the electrical circuit or failure of the control elements. This can be either a banal lack of voltage in the outlet or a failure of complex electronics or a trigger mechanism. It is important not to panic and consistently check the main components in order to understand the scale of the problem.
First of all, you should exclude external factors: check whether the indicator light on the case is on, whether the power cord is working and whether it is securely connected. If the light does not light up, the problem may lie with the surge protector or extension cord you are using. However, if the light is on and silent, it means that electricity is reaching the board or thermostat, but the start command is not received. In this article, we will analyze in detail the main components responsible for starting the engine and help localize the fault. compressor is silent, which means that electricity is reaching the board or thermostat, but the start command is not received. In this article, we will analyze in detail the main components responsible for starting the engine and help localize the fault.
Modern models, such as Biryusa 133 or newer series with electronic control, may behave differently if they break down. Old mechanical units simply stop cooling, while new ones may display error codes or flash indicators. Knowing which model you have will help narrow your search. We will consider diagnostics for both classic two-chamber refrigerators and systems with No Frost, where the startup chain may be more complicated due to the presence of additional sensors.
Primary diagnostics and checking the power supply
Before disassembling the case and grabbing the multimeter, you need to make sure that integrity of the external circuit. Often the reason is trivial: the contact in the socket has come loose or the circuit breaker on the panel has tripped. Check the voltage by connecting another powerful device, such as a hair dryer or kettle, to the same outlet. If they work, then the problem is localized inside the refrigeration unit itself. Also carefully inspect the power cord for kinks, melts, or signs of pet bites.
If everything is fine with the outlet, pay attention to the indicators on the front panel. Their behavior can reveal a lot about the state of the system. In some cases, especially after power surges, the power filter inside the case could burn out or the fuse on the control board could blow. This is a protective reaction that breaks the circuit to prevent fire or failure of an expensive compressor.
⚠️ Attention: Before any manipulations with the internal wiring, be sure to disconnect the refrigerator from the network. Even if it does not work, there may be a residual charge in the capacitors, and the risk of getting an electric shock when testing a live circuit is too great.
To check the continuity of the circuit, you can use a multimeter in continuity mode. Ring the cord from the plug to the point where it enters the housing. If the device shows a break, the cord must be replaced. In models with mechanical control, the current goes directly to the thermostat, and in models with electronics - first to the board. The lack of response to switching on is often associated with this first section of the circuit.
Thermostat malfunctions in mechanical models
In classic models, such as Biryusa 6 or Biryusa 8, the thermostat is responsible for turning on the compressor. This is a mechanical device that opens and closes contacts depending on the temperature in the chamber. If the thermostat fails in the "open" position, the compressor power circuit will never close and the motor will not start. This is one of the most common reasons for the silence of the unit.
For diagnostics, you need to get to the thermostat, usually it is located inside the refrigerator compartment or under the top cover. By removing the control knobs and the protective panel, you will see the contacts. They can be carefully closed with a jumper (piece of wire) for a short time. If, when the contacts are closed, the compressor immediately hums and starts, it means that the culprit has been found - the thermostat requires replacement. Do not leave the jumper permanently, as the refrigerator will stop turning off and may defrost food or ice up.
Often the problem lies not in the mechanism itself, but in the capillary tube of the thermostat. If it is damaged or the gas has evaporated from it, the bellows will not compress and the contacts will not close. Also, the contacts inside could simply burn out from sparking over years of operation, losing conductivity. A visual inspection may show a black coating or melting of the plastic around the contact group.
Start and thermal relay: check and replacement
If the thermostat is working or you have a model with electronics, the next candidate for testing is the start relay. This small unit is attached directly to the compressor housing. Inside it there is a coil and a movable core (or a posistor in more modern models) that help the engine gain speed. If the relay burns out, the motor winding does not receive the required impulse to start, and the compressor is silent or only clicks quietly.
To check the relay, it must be removed from the compressor. Carefully bend the fasteners and remove the casing. Visually inspect the insides: the presence of burning, blackened plastic or a characteristic burning smell indicates a breakdown. You can check the integrity of the coil with a multimeter. If the coil resistance is infinity (open) or zero (short circuit), the relay is faulty. Also check the thermal protective element, which is often built into the same structure or comes as a separate “pill.”
It is important to understand that a burnt-out relay is often a consequence, not a cause. It could fail due to a power surge, old age, or, worse, due to problems with the compressor itself (turn-to-turn short circuit). Therefore, when installing a new relay, be prepared for the fact that if it burns again, you will have to check the motor windings. For models Biryusa 134 and similar ones, relays such as RT, RKT or posistor analogues are often used.
Is it possible to temporarily start a refrigerator without a relay?
Theoretically, it is possible to apply voltage directly to the starting and operating windings, but this is extremely dangerous without special skills. An incorrect connection will cause the compressor to burn out within seconds. It is better to replace an inexpensive relay than to risk the motor.
Problems with the control board in models with electronics
Modern Biryusa refrigerators, equipped with displays and the No Frost system, are controlled by an electronic module. If the refrigerator does not turn on, and the display on the panel behaves strangely (flashing, the wrong segments are lit) or is absent altogether, the problem may be in the control unit. Electronics are sensitive to voltage changes and humidity, which can condense inside the case if the seal is broken.
When inspecting the board, pay attention to swollen capacitors, blackened tracks or traces of oxidation of contacts. Often a fuse on the board or a varistor burns out, which takes the first blow when there is a power surge in the network. Replacing a blown fuse may temporarily solve the problem, but if the cause of the surge or short circuit in the load (for example, in a defrost heating element) is not eliminated, the protection will work again.
In some cases, the control module freezes due to a software failure. Try performing a hard reset: unplug the refrigerator for 15-20 minutes, and then turn it on again. If after this procedure the compressor does not start, and the diagnostics show a module error, a professional flashing or replacement of the board will be required.
| Symptom | Probable cause | Check method |
|---|---|---|
| Indicator is on, silence | Thermostat, relay | Close thermostat contacts |
| Click and silence | Start relay, jammed | Checking relays and windings |
| Indication flashing | Failure of board, sensors | Diagnostics of error codes |
| No reaction at all | Open circuit, cord, socket | Continuity of circuit multimeter |
Temperature sensors and defrost system
In refrigerators with a No Frost system, the start of the compressor is controlled not only by a thermostat, but also by temperature sensors that transmit a signal to an electronic module. If one of the sensors (for example, an evaporator sensor or an air sensor) shows incorrect data or is broken, the module may “think” that the chamber is already cold and does not give a command to turn on.
It is also worth checking the defrost circuit. If the defrost heating element is broken into the housing or there is a short circuit in the system, when you try to turn on the defrost mode (which can be started periodically), the protection is triggered and the compressor is blocked. In some Biryusa models, a malfunction of the defrost sensor causes the refrigerator to go into emergency mode and stop freezing.
⚠️ Attention: When checking the sensors, do not heat them with open fire. Use warm water or a hair dryer at minimum power, monitoring changes in resistance with a multimeter. Sudden overheating will destroy the sensitive element.
To diagnose sensors, you need to know their nominal resistance at a certain temperature. Typically at room temperature it is several kiloohms. If the multimeter shows infinity or zero, the sensor is faulty. Replacing the sensor is a simple procedure, but requires selecting an analogue with a similar temperature characteristic.
☑️ Diagnostics before calling a technician
Mechanical damage and broken circuit
Do not discount physical damage. The internal wiring of the refrigerator can be chewed by rats (especially if the refrigerator was in a country house or balcony), rubbed against the sharp edges of the metal, or melted. Carefully inspect the wiring harnesses leading to the compressor and chamber. Pay special attention to the places where the wires pass through the housing - the insulation is often damaged there.
Another hidden problem is the oxidation of contacts in connectors. In conditions of high humidity (especially in the lower part of the refrigerator, where the compressor is located), the contacts may become coated with oxide, which prevents the passage of current. Cleaning the contacts and treating them with a special spray for electrical contacts often brings life back to old units.
If all of the above did not help, the problem may be in the compressor itself. Interturn short circuit of the windings or jamming of the piston group leads to the fact that the engine cannot start. In this case, the thermal protection relay instantly opens the circuit, and you only hear a short click. You can check the windings by measuring the resistance between the contacts on the compressor. If the resistance of one of the windings is very different from the norm or equal to zero/infinity, the compressor is faulty.
Why the Biryusa refrigerator clicks, but does not turn on?
The clicking sound is usually made by the starting relay or thermal protection. This means that current is trying to flow to the compressor, but the trigger does not work or the motor cannot turn over. Reasons: faulty start relay, jammed compressor or low voltage in the network.
Is it possible to replace the thermostat with a universal one?
Yes, in many cases you can install a universal thermostat (for example, TAM-133), choosing an analogue according to the length of the capillary tube and the temperature range. However, for models with precise electronic control, this will not work; an original part is needed.
How long should the compressor cool down after an unsuccessful start?
After several startup attempts, the thermal protection blocks the compressor. It needs to cool for 30-40 minutes. Do not try to turn on the refrigerator more often, this may lead to permanent failure of the motor.
Does the temperature in the room affect the start-up?
Yes, if the refrigerator is in an unheated room at a temperature below +10°C (or +5°C for some models), the thermostat may not turn on the compressor, since it believes that the temperature is already low enough. Also, thick oil in the compressor makes it difficult to start in the cold.