Sudden stoppage of the compressor or its humming without starting cooling - classic symptoms indicating problems in the engine electrical circuit. Most often in refrigerators Atlant the culprit is the start-up relay, which is responsible for supplying voltage to the motor windings. If this small component fails, the entire unit ceases to perform its function, threatening food spoilage.
Diagnostics of this part does not require sophisticated equipment, but requires adherence to strict safety rules. In this article, we will look at how to visually and instrumentally determine a breakdown, which relay models are suitable for different series of refrigerators, and whether it is worth trying to restore the old element.
Before starting any work, you must completely de-energize the device. Working with live electrical components can be deadly, so simply unplugging the plug is the first and most important step. After this, you can begin dismantling the rear panel to access the compressor.
Symptoms of a faulty start relay
Understanding the symptoms allows you to reduce the time needed to find the problem. Start relay in refrigerators Atlant often fails due to power surges or natural wear and tear contacts. The first bell may be a characteristic click, which is repeated every few minutes, but the cold does not appear inside the chamber.
The compressor may try to start, hum for a few seconds, and then suddenly go silent. This indicates that the starting winding does not receive an impulse to start, or the thermal protection is triggered. In some cases, the engine hums constantly, but the shaft does not turn, which may indicate jammed contacts inside the relay.
⚠️ Attention: If you smell burning plastic or see melted plastic on the relay body, operating the refrigerator is strictly prohibited. This can lead to a short circuit or fire in the wiring.
It is also worth paying attention to the temperature of the compressor housing. If it heats up to very high temperatures in a short time of operation, this is a sure sign that the current is not flowing correctly or the motor is running in overload mode. In such cases thermal protection may not have time to turn off the power in time.
Dismantling and visual inspection of the component
To check the refrigerator relay Atlantyou need to gain physical access to it. It is located directly on the side or rear of the compressor, often covered by a plastic casing. Remove the back metal panel of the refrigerator by unscrewing the fixing screws and find the black cylindrical or box-shaped motor.
A plastic box is attached to the compressor pipe, where the three electrical contacts come out. This is the node we are looking for. Carefully remove the retaining bracket or spring that holds it in place. Often, to do this, it is enough to simply pull the part down or to the side, having first disconnected the wires if they do not have quick-release terminals.
During an external inspection, pay attention to the condition of the plastic. If the case is blackened, melted or cracked, replacement is inevitable. Inside there should be no traces of burning, soot or oxidation of contacts. Contact group should be clean and shiny, without soot.
☑️ Removing the relay
Diagnostics with a multimeter: step by step instructions
The most accurate result is obtained by checking with a multimeter. This device allows you to measure winding resistance and circuit integrity. Switch the tester to resistance measurement mode (Ohm) and prepare the probes. Before testing, make sure that the relay is completely dry and free of dust.
If you have a relay with a posistor (often found in modern models Atlant), the test proceeds as follows: connect the probes to the input contacts. When cold, the posistor should show low resistance. If the device shows infinity (one on the left of the screen) or zero, the part is faulty. For thermal relays, it is important to check the short circuit of the bimetallic plate.
Checking the inductor is also important. The resistance must be in a certain range, usually from 3 to 15 Ohms, depending on the power of the motor. If the resistance is significantly higher or lower than the nominal value, it means that a break in the turns or a short circuit has occurred. Winding resistance is a key parameter for performance.
⚠️ Attention: The technical characteristics of the relay may vary depending on the year of manufacture of the refrigerator. Always check the markings on the case with the documentation or the correspondence table, since external similarity does not guarantee compatibility.
When diagnosing, it is important not to confuse the contacts. There are usually three of them: general, starting and working. Incorrect connection of probes may give false readings. If you are not sure of your actions, it is better to contact a specialist, as an error can lead to combustion of the new compressor.
What is a posistor and how does it work?
A posistor is a thermistor with a positive temperature coefficient. When cold, it passes current to the starting winding, helping the motor start. When heated, its resistance increases sharply, actually opening the starting winding circuit. If the posistor is “broken,” the starting winding remains on, which leads to overheating.
Relay correspondence table for Atlant refrigerators
The spare parts market offers many options, but Atlantov it is critically important to choose the right type. Using the wrong relay will either prevent the motor from starting or burn out the winding. Below is a table of the main types of relays used in different series.
| Relay type | Atlant refrigerator series | Compressor power | Features |
|---|---|---|---|
| RT-K (Posistor) | New models (XM-4008, 4425, etc.) | 1/5 - 1/4 hp | Requires cooling time (3-5 min) before restarting startup |
| R-1 (Induction) | Old models (Minsk, KSh-254) | Up to 150 W | Works in any position, but is sensitive to vibration |
| LS-07B (Universal) | Suitable for many analogues | Up to 1/3 hp | Often requires modification of contacts or adapter |
| 33.600.02 | Two-compressor models | Average power | Specific shape of the case, it is important not to confuse the polarity |
When buying a new part, always compare the markings. Manufacturer code usually stamped on the top of the case. Even if the shape is the same, the internal circuit may be different, which will lead to incorrect operation of the starting system.
Replacement and testing after repair
The replacement process is relatively simple if you have already reached the unit. Remove the old relay by carefully disconnecting the wires (remember or take a photo of which wire is connected where). Install the new element onto the compressor pipe until there is a characteristic click or stop.
Connect the wires according to the diagram. Typically, the yellow-green wire is ground, brown or black is phase, blue is zero, but colors may vary depending on the year of production Atlanta. Securely fasten the fixing bracket so that vibration does not disrupt the contact.
After assembly, do not rush to close the back cover. Plug in the refrigerator and listen. The compressor should start with a characteristic hum, which after a few seconds turns into a smooth hum. If you hear a crackling sound or the motor hums and stops, turn off the device immediately.
Check the heating of the new relay housing. It may be slightly warm, but should not be hot. If after 20 minutes of operation cold appears inside the chambers and frost is visible on the evaporator, the repair can be considered successful. Reinstall the back panel.
Common mistakes during DIY repairs
Home craftsmen often make typical mistakes that lead to repeated breakdowns. One of them is ignoring the condition of the compressor itself. If the motor has an interturn short circuit, the new relay will burn out after a few minutes of operation with it. Therefore checking the compressor is mandatory.
Another mistake is using a relay “at random”, just to fit the size of the hole. Different power requires different current to open the contacts. Installing a weak relay on a powerful motor will lead to stuck contacts and burnt out wiring.
⚠️ Attention: Never try to short-circuit the relay contacts to “start” the refrigerator permanently. This disables the engine protection, which is guaranteed to lead to its combustion or fire within a short time.
Also, do not forget about the cleanliness of the contacts. If you install a used relay or one that has been in storage for a long time, oxides may prevent normal current flow. Cleaning the contacts with fine sandpaper sometimes helps to revive the part, but this is a temporary solution.
Is it possible to repair the Atlant relay yourself?
Theoretically, you can clean the contacts or replace the burnt coil, but the service life of such repairs is extremely low. Factory assembly provides sealing and precise calibration that is difficult to replicate at home. It’s cheaper and more reliable to buy a new original.
When you need to call a specialist
Despite the apparent simplicity, there are situations when you shouldn’t go inside yourself. If after replacing the relay the situation has not changed, the problem is deeper. The compressor itself, the thermostat or the electronic control module may be faulty. Diagnosis of these components requires special equipment.
If you see traces of oil around the compressor tubes, this may indicate a freon leak. In this case, replacing the relay will not help - the refrigerator will not freeze due to the lack of refrigerant. Here you need a master with a vacuum pump and a supply of gas.
Complex electronic models Atlant with a No Frost system and displays may require reprogramming the board after a power surge. If the relay is working properly, but the motor does not turn, perhaps the brain center of the refrigerator is “glitchy.”
How much does a new relay cost for Atlant?
The cost of a starting relay varies from 500 to 1500 rubles, depending on the model and manufacturer of the spare part. Original components are more expensive, but provide better compatibility.
Why does the relay click but does not start the motor?
Clicks mean that the thermal protection is triggered, opening the circuit. Reasons: the compressor is jammed, the relay itself is faulty (does not close the starting winding) or low voltage in the network.
Is it possible to use a relay from another brand?
Yes, if the electrical characteristics (power, type of compressor) and the geometric dimensions of the seat match. Universal relays of the PTC type are often suitable.
How often do you need to change the relay?
The service life of the relay is not strictly limited in time, but on average they last 5-10 years. Frequent power surges in the network significantly reduce this period.
Is it dangerous to change the relay yourself?
If electrical safety rules are strictly observed (disconnecting from the network), the risk is minimal. The main danger is electric shock when the device is turned on or damage to the compressor tubes during careless removal.