The brand's refrigeration equipment Atlant is famous for its reliability and durability, however, even the highest quality units can fail over time. One of the most expensive and complex components is the compressor, which is often called the “heart” of the system. It is he who is responsible for the circulation of the refrigerant, creating the necessary pressure for the cooling process. If you notice that your refrigerator has stopped freezing, makes strange sounds or does not turn on at all, the first thing you should think about is diagnosing this particular unit.
Before sounding the alarm and calling a technician, it is important to conduct an initial self-diagnosis, which will help you understand the scale of the problem. Checking the compressor requires attentiveness and basic knowledge in electrical engineering and the availability of simple tools. In this article, we will analyze in detail the algorithm of actions that will allow you to determine whether the motor-compressor is working properly, or whether the reason lies in other elements of the electrical circuit. Remember that competent diagnostics will save your money and time.
It is worth noting that modern models Atlant can be equipped with both conventional piston compressors and more modern inverter ones. The methods for testing them can vary significantly, so it is important to first determine the type of equipment installed. In most cases, we are talking about classic single-phase motors, the diagnostics of which we will consider first. The exact model of the compressor is always indicated on a sticker located on the metal body of the unit itself.
Primary visual diagnostics and condition assessment
Any repair or diagnostic work on household appliances should begin with an external inspection and analysis of the device’s behavior. Often the signs of a compressor malfunction are obvious and do not require disassembly of the electrical part. If the refrigerator Atlant hums, but does not cool, or starts for a few seconds and immediately turns off with a characteristic click, this may indicate problems with the starting mechanism or the motor itself.
Carefully inspect the back wall of the refrigerator. Pay attention to the condition of the compressor: whether there are any traces of oil, rust or mechanical damage. Oil smudges may indicate depressurization of the system, which is a critical malfunction. Also check the integrity of the electrical wires going to the unit - melted insulation indicates overheating or a short circuit.
Listen to the sounds that the refrigerator makes during operation. A uniform hum is normal. However, if you hear metallic knocking, ringing or loud bangs, this is a bad sign.
⚠️ Attention: If you hear a loud click followed by silence when you turn it on, do not try to turn the device back on immediately. This can lead to permanent failure of the windings or the start relay.
Check the temperature of the compressor housing. During normal operation, it should be warm or hot (depending on the model and duration of operation), but not hot to the point where it is impossible to touch. If the motor is cold when the refrigerator is plugged in, it means there is no voltage supplied to it. If it overheats instantly, perhaps an interturn short circuit has occurred turn-to-turn short circuit.
Necessary tools and safety measures
To properly check the refrigerator compressor Atlant you will need a minimal set of tools that many home craftsmen have. The main device for diagnosing the electrical part is a multimeter (tester). Without it, it will not be possible to accurately measure the resistance of the windings, so the presence of this device is mandatory.
In addition to the measuring device, prepare the following tools:
- 🔧 A set of screwdrivers (phillips and flat) for removing the protective casing.
- 🔌 Insulating materials (insulating tape, heat shrink) for restoring contacts.
- 🧤 Dielectric gloves for protection against electric shock.
- 🔦 Flashlight for better illumination of the working area in the compressor niche.
Safety is priority number one. Before starting any work, you must completely turn off the power to the refrigerator by removing the plug from the socket. Even after disconnection, residual charges may remain in the electrical circuit, so do not touch live parts with bare hands unless necessary. Work only in a dry room, avoiding contact with water.
If you find that the wiring has traces of rodents or mechanical damage, they must be eliminated before taking measurements. The use of damaged wires may result in false tester readings or a short circuit.
⚠️ Attention: It is strictly prohibited to measure resistance or circuit continuity while the device is connected to the mains. This will lead to instant damage to the multimeter and can be life-threatening.
Removing the protective casing and accessing the contacts
To get to the electrical contacts compressor, you must remove the protective plastic or metal casing located at the lower rear of the refrigerator Atlant. It is usually secured with several screws or latches. Be careful, the plastic becomes brittle over time and can crack if handled carelessly.
After removing the cover, you will see a compressor with a start-up relay attached to it. It is in this node that there are contacts that we need to check. The relay is a black box placed on the contact group of the compressor. To access the motor terminals, the relay often has to be removed, but this must be done carefully so as not to damage the fragile contacts.
On the compressor housing you will see three terminals arranged in a triangle. They can be covered with an additional plastic cover or rubber insulation. It is important to remember or photograph the location of the wires before disconnecting them. Standard marking of terminals:
- ⚡ S (Start) — starting winding.
- ⚡ R (Run) —working winding.
- ⚡ C (Common) —common wire.
In some models Atlant there may be no markings, then you will have to navigate by the location of the contacts or the documentation for specific compressor model. If you doubt your abilities at this stage, it is better to stop and turn to professionals, since an incorrect connection can lead to a new compressor.
☑️ Preparation for measurements
Checking the integrity of the windings with a multimeter
The most reliable way to determine the condition of the electrical part of the engine is to measure the resistance of the windings. To do this, switch the multimeter to resistance measurement mode (Ohm). First you need to check the circuit for a short circuit to the body. Press one probe to any contact, and the second to a copper tube or an unpainted part of the compressor housing.
If the device shows “infinity” (one in the most significant digit or the OL symbol), then there is no breakdown to the housing. If you see specific resistance numbers, this indicates an insulation breakdown. Such a compressor cannot be used, as it is dangerous to life. Next, we check the resistance between the windings themselves. Normal values for engines Atlant usually are within the following limits:
The resistance between the common contact and the working winding should be approximately 10-20 Ohms. The resistance of the starting winding is usually higher - from 20 to 40 Ohms. The sum of the resistances of the starting and operating windings should be approximately equal to the resistance between the extreme contacts (if measured directly). Value range or complete absence of resistance (break) indicates a motor malfunction.
Below is a table with approximate resistance values for different types of compressors installed in refrigerators:
| Measurement type | Normal value (Ohm) | Failure sign |
|---|---|---|
| Working winding | 10 - 25 Ohm | Open (∞) or short circuit (0) |
| Starting winding | 20 - 45 Ohm | Value below normal |
| Winding on the body | Infinity (∞) | Any numerical value |
| Thermal relay (protection) | 0 Ohm (closed) | Infinity (open) |
It is important to understand that the values may vary slightly depending on the engine temperature. On a cold engine the resistance will be lower, on a hot one it will be higher. If you see a significant deviation from the norm, especially downward, this may indicate interturn short circuit. In this case, the motor will get very hot and consume increased current.
What is an interturn short circuit?
This is a violation of the insulation between the turns of the winding, leading to a decrease in the overall resistance. The multimeter may show the norm or a slight deviation, but the engine will not work correctly, hum and heat up quickly. An accurate diagnosis can only be made using current clamps.
Diagnostics of the starting relay and thermal protection
Often the cause of a non-working compressor is not the motor itself, but the starting relay. This device supplies an impulse to the starting winding to start the engine. In refrigerators Atlant most often there are relays with a posistor or induction ones. If the relay is faulty, the compressor may hum, but not start, or constantly click.
To check the relay, it must be removed and disassembled. Visually inspect the insides: there are no traces of burning, melting or destruction of the posistor. Test the relay contacts with a multimeter. When cold, the contacts must be open (for some types) or closed. When shaken, the relay should not rattle - if you hear the sound of dangling parts, it means that the mechanical part is destroyed.
Also check the thermal protection, which is often built into the relay or located nearby. It opens the circuit when it overheats. In its normal state (at room temperature) it should “ring”, that is, show zero resistance. If the circuit is broken, try gently knocking on the protection housing - sometimes the contacts stick. If this does not help, the element requires replacement.
⚠️ Attention: Starting relays for refrigerators Atlant can be interchangeable only within the same series. Installing an unsuitable relay can lead to burnout of the compressor starting winding in the very first minutes of operation.
Specifics of checking inverter compressors
Modern models of refrigerators Atlant are increasingly equipped with inverter compressors. Their diagnostics are fundamentally different from checking conventional engines. The inverter motor does not have a classic starting winding and a starting relay in the usual sense. Start-up and speed control are carried out by an electronic unit.
You can check such a compressor with a conventional multimeter only for broken windings and breakdown to the housing. The resistance of the windings of an inverter motor is usually symmetrical and amounts to several tens of ohms. However, even if the windings are intact, this does not guarantee the serviceability of the compressor, since the problem may be in the electronic control module.
To fully diagnose inverter systems, special equipment is required that allows you to simulate the operation of the control board. At home, one can only state the fact that there is no startup when there is voltage at the input to the control unit. If you are the owner of such equipment, independent repairs without deep knowledge of electronics are not recommended.
Typical errors in self-diagnosis
Home craftsmen often make mistakes that can aggravate the situation. One of the most common is an attempt to start the compressor directly, bypassing the relay, for testing. This can only be done for a short time and in compliance with all precautions, since without the starting phase the engine may not start and simply burn out.
Another mistake is ignoring the state of the capacitor (if it is in the circuit) or incorrectly assessing the multimeter readings. People often confuse measurement modes, trying to find the resistance with the device turned on or in diode testing mode. Always check the device settings before taking measurements.
You should also not forget about the possible leak of freon. If the compressor is working properly, the relay clicks, the motor hums, but there is no cold - perhaps there is no refrigerant in the system. In this case, checking the electrical system will take a lot of time in vain. Check whether the condenser (grid at the back) is heating up and whether there is cooling in the first minutes of operation.
If after all the checks you find out that the compressor is faulty, do not rush to throw away the old refrigerator. Replacing a compressor is a labor-intensive procedure, requiring evacuation of the system and refilling with freon, but it can give the equipment a second life. However, this is not always economically justified, especially for older models.
Is it possible to replace a conventional compressor with an inverter one?
Theoretically it is possible, but in practice this requires a complete replacement of the control system, wiring and power supply. For Atlant refrigerators, such an upgrade is not economically feasible and technically complex.
What is the normal resistance of the Atlant compressor windings?
For most models of Atlant refrigerators, the resistance of the operating winding is 10-20 Ohms, and the starting winding is 20-40 Ohms. The exact values depend on the power of a particular motor and are indicated in the technical documentation.
Why does the compressor hum but does not start?
Most often the reason lies in a faulty start relay or a jammed piston group. It is also possible that there may be a drop in voltage in the network or oxidation of the contacts.
Is it possible to restore a jammed compressor?
There is a method of “wedging” by applying increased voltage, but it only helps in case of slight jamming and does not guarantee long-term operation. In most cases, a jammed compressor requires replacement.
Where can you find the compressor markings on the Atlant refrigerator?
The marking sticker is located on the metal body of the compressor itself, usually on the top or side. To see it, you often need to remove the protective plastic casing.
Is it dangerous to change the compressor yourself?
Yes, it is dangerous. The process involves working with high voltage and gas under pressure. Improper soldering or filling may result in an explosion or fire. It is recommended to entrust this work to certified specialists.