A sudden failure of refrigeration equipment always becomes an unpleasant surprise, especially when there are perishable products in the chamber. Equipment owners Biryusa often face a situation when the unit stops cooling, and the first suspicion falls on the heart of the system - compressor. Understanding how to check the engine on a Biryusa refrigerator allows you to save significant money on calling a technician or avoid buying a new device if the problem is solved by replacing inexpensive components.
Before proceeding with complex manipulations with a multimeter and disassembling the technical part, it is necessary to carry out an initial visual and acoustic assessment of the device condition. Often external signs allow you to localize the problem without opening the casing. It is important to understand that electric motor is a complex mechanism, and its diagnosis requires compliance with safety rules and sequence of actions.
Modern models of refrigerators are equipped with various types of motors, including inverter and classic piston units. The methods for checking them may differ, but the basic principles for identifying faults remain similar for most modifications Biryusa. In this article, we will analyze in detail the algorithms of actions that will help you determine the performance of the compressor.
Primary diagnostics without opening the case
The test should always begin with an analysis of the behavior of the refrigerator in operating mode. If you notice that the equipment is humming, but does not generate cold, or the motor turns on for a few seconds and immediately turns off with a characteristic click, this is already half the diagnosis. Thermal relay protection may be triggered due to overheating of the windings or mechanical jamming of the piston group.
Listen to the sounds made by the unit. A steady hum indicates normal operation, while a knocking, grinding or intermittent hum indicates problems. It is also worth paying attention to the temperature of the compressor housing: if it is hot to the point where it is impossible to hold your hand, this is a sign of overload or problems with heat dissipation.
⚠️ Attention: If you smell burning or see sparking in the motor area, immediately unplug the refrigerator from the power supply. Continuing operation in this condition may lead to a fire in the wiring.
For a more accurate initial assessment, you can use a simple method of checking the cyclic operation. Record the operating and resting times of the compressor. Normally, the refrigerator runs for about 15-20 minutes, followed by a break. If the cycle is broken and the motor tries to start every 2-3 minutes, this is a clear symptom of a malfunction of the starting system or the engine itself.
Necessary tools and safety measures
To carry out high-quality diagnostics, you will need a minimum set of tools that most home craftsmen can find. The key device is multimeter (tester), which allows you to measure the resistance of the windings and the integrity of the circuit. Without this device, the check will be only superficial.
In addition to the measuring device, prepare the following tools:
- 🔧 A set of screwdrivers (flat and Phillips) for removing the protective casing.
- 🔌 Pliers or side cutters for working with wires and clamps.
- 🧤 Dielectric gloves for protection against electric shock.
- 💡 A portable lamp or flashlight for illuminating the work area.
Safety is priority number one. All work on disassembling and testing contacts must be carried out exclusively with unplugged an electrical appliance. Residual voltage in capacitors can be dangerous, so after removing the plug from the socket, it is recommended to wait 5-10 minutes before starting work.
It is also important to ensure good lighting and easy access to the back wall of the refrigerator. If the model is built-in, it must be removed from the niche. Do not forget that the refrigerant in the system is under pressure, so damage to the copper tubes due to careless operation is unacceptable.
Removing the protective casing and visual inspection
To get to the internal components, it is necessary to remove the plastic or metal casing covering the compressor group. It is usually secured with snaps or a few screws. Be careful as the plastic can become brittle and brittle over time.
After removing the cover, perform a careful visual inspection. You are interested in traces of soot, melted wire insulation, or blackening of the compressor housing itself. If you see that starting relay or the capacitor has a swollen appearance or traces of burning, there is a high probability that the problem lies in them, and not in the engine itself.
What to do if an oil leak is detected?
If signs are visible under the compressor oil stains, this may indicate a leak in the seals or a crack in the housing. In this case, repairing the compressor is not economically feasible - a complete replacement of the unit is required.
Pay attention to the condition of the copper tubes. There should be no creases or signs of corrosion on them. Also check that the wires are securely attached to the motor contact group - oxidized contacts can prevent normal starting.
Checking the starting relay and capacitor
Often the cause of compressor failure is not the engine itself, but its starting system. The starting relay is responsible for supplying an impulse to the starting winding at the moment of start. If it is faulty, the motor will hum, but will not start, after which the thermal protection will operate.
To check the relay, you need to remove it from the compressor contacts. Shake the device: if a ringing sound is heard inside, it means the mechanism or contacts are damaged. A more accurate check can be carried out with a multimeter in dial mode. The resistance must correspond to the standard, and the contacts must close in a certain position.
If your model Biryusa has a starting capacitor installed, it should also be checked for breakdown or loss of capacity. A swollen capacitor housing is a clear sign of the need for replacement. The cost of these elements is low, so they are often replaced preventively during repairs.
Do not forget that a working relay and capacitor guarantee proper engine starting. If after replacing them the situation has not changed, the problem most likely lies deeper - in the windings of the electric motor itself.
Diagnostics of the compressor windings with a multimeter
This is the most important stage of the test, allowing you to determine the condition of the electrical part of the engine. The contact group of the compressor usually has three terminals: two for the working windings and one common. To carry out diagnostics, you need to remove the insulating tape or block from the contacts.
Switch the multimeter to resistance measurement mode (Ohm). First, check the circuit for breakdown on the housing: press one probe to any contact, and the second to the cleaned metal part of the compressor housing (where there is no paint). The device should show infinity (one in the most significant digit). If resistance is visible, it means there is insulation breakdown, and the motor is faulty.
Next, we check the resistance between the contacts themselves. Normal resistance values for a working compressor usually lie within the following limits:
- 📏 Between common and working contacts: 15–35 Ohms.
- 📏 Between common and starting contacts: 30–50 Ohms.
- 📏 Between working and starting contact: 45–85 Ohm (sum of the previous two).
It is important to understand that the exact numbers may vary depending on the power and model of the motor. The main rule: the resistance of the starting winding is always higher than the working winding. If the device shows zero (short circuit) or infinity (break) on any of the pairs of contacts, the compressor must be replaced.
| Type of malfunction | Multimeter readings | Probable cause | Solution |
|---|---|---|---|
| Open circuit | Infinity (1) | Winding burnt out | Replacing the compressor |
| Short circuit | Zero (0.00) | Short circuit of turns | Replacing the compressor |
| Breakage to the housing | There is resistance | Insulation broken | Replacement compressor |
| Normal | 15-85 Ohm (depending on the pair) | Good | Search for other reasons |
Measuring the starting current and mechanical check
If the electrical part is normal, but the refrigerator still does not work, it is worth checking the mechanical component and the starting current. To measure current, you will need special current clamps. They are put on the power cord when the refrigerator is turned on.
At the moment of startup, the current should jump briefly and then drop to operating values. If the current remains high and the compressor hums but does not start, the piston group may be stuck. This often happens due to oil burnout or moisture entering the system.
⚠️ Attention: Measure current characteristics only if you are confident in your skills in working with live electrical appliances. Do not touch live parts with your hands!
There is a popular, but risky method of checking for a “wedge”: applying voltage directly to the working winding, bypassing the relay. If the compressor starts confidently and picks up speed, then the problem was in the relay. If a hum is heard and the plugs are knocked out, the motor is jammed. The 220V supply directly should last no more than 3-5 seconds to avoid burning out the windings.
☑️ Algorithm for checking the compressor
Frequent questions and answers (FAQ)
Is it possible to restore a jammed compressor?
In rare cases, “wedging” helps by applying increased voltage or mechanical action, but this is a temporary measure. It is more reliable and safer to replace the unit with a new one, since the resource of the damaged mechanism has already been exhausted.
Why does the new compressor not start after replacement?
There may be several reasons: a faulty installed start relay, a lack or excess of refrigerant, or the presence of an air lock in the system. It is also important to check whether the capillary pipeline is clogged.
How much does it cost to replace the compressor on a Biryusa refrigerator?
The cost consists of the price of the unit itself and the work of the technician. On average, replacement costs 40-60% of the cost of a new refrigerator, which makes repairs worthwhile if the rest of the equipment is in good condition.
Does a working compressor hum?
Yes, a working motor produces a smooth, low-frequency hum. Strong vibration, clanging, knocking or whistling indicate mechanical malfunctions, worn bearings or improper installation of the refrigerator (legs are not adjusted).