A sudden stop of the compressor or its chaotic operation with a characteristic hum and subsequent clicking often indicates problems in the electrical engine starting circuit. In brand refrigerators Biryusa, especially in models with linear compressors, it is the starting relay that takes on the role of the primary voltage supply controller. If this small but critical component fails, the unit stops producing cold, and the food begins to deteriorate.
Before calling a technician, many owners try to understand the essence of the breakdown on their own. Relay diagnostics is one of the few repair stages that can be performed at home with a basic set of tools. Correct identification of a fault will allow you to save a significant amount, since the part itself is inexpensive, and its replacement does not require complex equipment. However, it is important to act consistently and follow safety measures when working with electrical appliances.
In this article we will analyze an algorithm of actions that will help you understand how to test the refrigerator relay Biryusa for functionality. We'll look at symptoms that indicate a breakdown, visual inspection techniques, and a precise test with a multimeter. You will also learn what types of relays are found in this technique and what to look for when purchasing spare parts.
Symptoms of a faulty starting device
The first sign that starting relay requires your attention is the abnormal behavior of the compressor. Instead of the smooth hum of a running motor, you may hear short bursts of humming, interrupted by a loud click. This means that the motor windings are receiving power, but the starting mechanism does not operate, and the thermal protection is activated.
Sometimes the situation looks different: the refrigerator turns on, runs for a few minutes, and then goes completely silent, and the cycle does not repeat for a long time. In rare cases, the relay may “stick” when turned on, which leads to overheating of the windings and a burning smell. It is important not to ignore these signals, since prolonged operation with a faulty starter can damage the compressor itself.
⚠️ Attention: If you smell melted plastic or see sparking in the back of the refrigerator, immediately unplug the appliance. Further operation in this condition may lead to a fire in the wiring.
The problem can be diagnosed by the following external signs:
- 🔊 The compressor hums for 3-5 seconds, then a click is heard and there is silence.
- 🌡️ The engine gets very hot, although the refrigerator does not cool.
- 💡 When turned on, the light in the chamber is on, but the motor does not start at all.
- ⚡ Broken plugs or a tripped circuit breaker in the panel immediately after turning on the refrigerator.
Design and types of relays in Biryusa refrigerators
For a successful check, you need to understand what kind of device you are dealing with. In technology Biryusa historically two main types of starting devices have been used: induction (electromagnetic) and posistor. Induction relays, often found in older models, have a moving core and contacts that open under the influence of gravity and a magnetic field.
Posistor relays, which are installed in more modern units, do not have moving mechanical parts. Their work is based on the property of a posistor (thermistor) to sharply increase resistance when heated by current. Understanding the type of your relay is important, since the methods of their initial diagnosis may differ slightly, although checking with a multimeter is universal.
Structurally, the relay is a plastic case, inside which contacts, springs and a coil or posistor are located. It is connected to the compressor through three terminals corresponding to the motor windings: starting, working and general. Incorrect connection or oxidation of the contacts inside the relay housing is a common cause of failures.
Comparative characteristics of the main types of relays are given in the table below:
| Parameter | Induction (Electromagnetic) | Posistor | Thermal (Protective) |
|---|---|---|---|
| Principle of operation | Magnetic field and gravity | Change in resistance when heated | Thermal expansion of a bimetallic plate |
| Mechanical parts | Yes (core, contacts) | No (crystal) | Yes (plate, contacts) |
| Sensitivity | Responses to position (vertical only) | Does not depend on position | Responses to current and temperature |
| Typical malfunction | Burning of contacts, jamming | Destruction of the posistor crystal | Loss of elasticity of the plate |
Preparation for diagnostics and safety measures
Any work on repairing electrical equipment must starts with security. Before you start checking the refrigerator relay Biryusa, you must completely de-energize the unit. Simply turning off the button is not enough - be sure to remove the plug from the socket. This will eliminate the risk of electric shock.
To carry out high-quality diagnostics, you will need a minimum set of tools. The main device will be a multimeter (tester), capable of measuring resistance and ringing circuits. You will also need a screwdriver (Phillips and flat-head), pliers and possibly a knife to strip the contacts. Do not forget to prepare a light source, since the back of the refrigerator is often poorly lit.
☑️ Preparing to check the relay
Particular attention should be paid to the condition of the wiring. If you see melted insulation or blackened wires leading to the relay, this may indicate a short circuit or overload. In this case, simply replacing the relay may not solve the problem; an inspection of the entire electrical circuit of the compressor will be required.
Visual inspection and dismantling of the relay
Access to the relay in refrigerators Biryusa usually does not require disassembling the body of the refrigeration chamber itself. Everything is located in the compressor well at the rear. After removing the protective casing, you will see a compressor with a plastic block attached to the bottom or side of it - this is the desired relay, often combined with a thermal protector.
Carefully remove the relay from the compressor terminals. In some models it is secured with a metal bracket or latches. Be careful: Old plastic cases can be fragile. After removal, carefully inspect the device from all sides. You are interested in traces of thermal effects.
What to look for during a visual inspection:
- 🔥 The presence of soot, soot or melting on the relay body.
- 🌫️ Darkening of the plastic, indicating overheating of the internal elements.
- 💥 Cracks on the body or swelling, indicating an internal breakdown.
- 🦊 Traces of rodents (often chewing wires near the relay).
If there are no visual defects, or after cleaning the problem persists, we proceed to the instrumental verification. Remember that the absence of external damage does not guarantee the serviceability of the internal electrical circuit.
Checking a relay with a multimeter: step-by-step instructions
The most accurate way to understand the condition of a part is to test it with a multimeter. Switch the meter to resistance measurement mode (usually indicated as Ω or ohm, limit 200 ohm or 2 kohm). If your tester has a “dialer” mode with a sound signal, use it for convenience.
First, let's check the thermal protective relay (if it is built into the starter housing). Connect the probes to the input and output contacts. The device should show a resistance close to zero (0.1–0.5 Ohm) and emit a sound signal. If the resistance is infinitely high (one on the screen), it means that the circuit is broken and the protector is burned out.
Next, we check the starting part. In induction relays the coil rings. The resistance should be small, but not zero (usually 10–50 ohms). In posistor relays, the resistance of a cold posistor is 10–30 ohms. If the multimeter shows an open circuit (infinity) or a short circuit (0 Ohm), the part is faulty and requires replacement.
⚠️ Attention: Do not take measurements with the device plugged in! This will lead to instant failure of the multimeter and can be dangerous for your life.
The testing process can be reduced to the following algorithm:
- Set the multimeter in resistance measurement mode.
- Determine the input and output contacts on the relay.
- Measure the resistance between the contacts.
- Compare the readings with the standard values for your type of relay.
Replacing the relay and checking the operation of the compressor
If the diagnostics showed a malfunction, the relay must be replaced. When purchasing a new part in a store, be sure to compare the markings on the old and new devices. For refrigerators Biryusa relays of the RT, R-1, R-2 series or their modern analogues (for example, from Danfoss or Indesit with the appropriate adapter) are often suitable.
Installation of a new relay is carried out in the reverse order of removal. Securely place the shoe on the three pins of the compressor. Make sure that it fits tightly and locks into place (snaps or stands under its own weight if the structure is vertical). Connect the wires according to the color code or diagram if you disconnected them.
After assembly, plug in the refrigerator. In the first seconds you should hear the compressor start confidently without prolonged buzzing or clicking. The motor should run smoothly. Let the unit run for 15-20 minutes and check the heating of the relay housing - it may warm slightly, but should not be hot.
Always check the part number with the catalog number indicated on the nameplate of your specific Biryusa refrigerator, since different engine modifications could be used in different years of production.
Frequently asked questions (FAQ)
Is it possible to repair a burnt-out relay yourself without buying a new one?
Theoretically, you can only replace the posistor or clean the contacts in the induction relay, but practice shows that such repairs are temporary. It is cheaper and more reliable to buy a new relay, which is inexpensive and will last for years.
Why does the Biryusa refrigerator relay often burn out?
The main reasons: power surges in the network, frequent switching on/off (the interval of 5-10 minutes is not observed), natural wear of the contacts or moisture ingress. Also, the reason may be the aging of the compressor itself, which consumes increased starting current.
How to distinguish a starting relay from a protective relay?
Often they are combined in one housing. If separate: the start relay is larger and has three contacts for connection to the compressor. The thermal (protective) relay is smaller, has two contacts and is placed directly on the compressor housing or inserted into the power circuit.
Will a refrigerator work without a relay?
No, it is impossible to start a modern compressor without a starting device. The motor winding will not receive the necessary phase shift or short-term connection of the starting winding to start. A direct connection will lead to humming and burning of the motor.