Refrigerators Atlant are deservedly considered one of the most reliable units in the post-Soviet space, but even time-tested equipment has breakdowns. Most often, owners are faced with a situation where the engine stops starting, hums, but does not cool, or does not show signs of life at all. In 80% of cases, the problem lies precisely in the operation of compressor or its starting equipment.
Before calling a technician or buying a new part, it is important to conduct competent diagnostics in order to accurately determine the cause of the malfunction. Self-checking allows you to save significant money, since sometimes the compressor is completely working, and the problem lies in a cheap relay or wiring. In this article we will analyze an algorithm of actions that will help you understand whether the “heart” of your refrigerator is alive.
You must begin any work by completely disconnecting the device from the electrical network. This is a basic safety rule and, if ignored, may result in electric shock or damage to the control electronics. After this, you should free access to the rear wall of the unit, where the motor-compressor is located.
Primary visual diagnostics and condition assessment
The first stage of testing does not require the use of complex measuring equipment. Carefully inspect itself compressor and the elements adjacent to it. Pay attention to the appearance: there should be no traces of oil on the housing, deep dents or corrosion that could compromise the tightness of the system. If you notice oily leaks in the area of the pipes or the motor itself, this is an alarming signal about depressurization.
Also check the condition of the start relay, which is usually attached to the side or bottom of the compressor housing. It comes in a black or white plastic box. If traces of melting, burning, or a characteristic smell of burnt insulation are visible on the plastic, then most likely the problem is in this unit. Sometimes it is enough to replace the relay to Atlant refrigerator work again.
⚠️ Attention: If during a visual inspection you find that the copper tubes coming from the compressor are broken or have obvious traces of soldering with oil stains, further independent diagnosis can be dangerous. The refrigerant under pressure could remain in the system or, conversely, evaporate completely.
Assess the integrity of the insulation on the wires going to the terminal block. Melted or cracked insulation can cause a short circuit, preventing the motor from starting. In such cases, a visual inspection provides up to 30% of information about the condition of the unit.
Checking the serviceability of the starting relay
Before “climbing” with instruments into the motor itself, it is necessary to exclude a malfunction of the starting relay. It is this element that supplies the impulse to start the windings and protects the motor from overloads. Remove the relay from the compressor contacts, having first photographed or memorized the wiring diagram.
Carefully open the relay housing (usually it is held on by latches). Inside you will see a coil and a moving core. Shake the relay next to your ear: if you hear a distinct rattling sound, like metal debris rattling, it means the contacts inside are burnt or crumbled. Such an element must be replaced.
- 🔍 Inspect the internal coil for blackening or melting.
- 🔍 Check the mobility of the core: it should move freely inside the coil.
- 🔍 Make sure that the contacts do not have carbon deposits that could interfere with the passage current.
If the relay looks clean and intact, you can try to check it with a multimeter for a short circuit, but most often the defect is visible visually. Replacing this unit is the easiest and cheapest way to revive refrigeration unit. The cost of a new relay is not comparable to the cost of a new compressor.
Diagnostics of motor windings with a multimeter
If the relay is in order, we move on to the most important part - checking the electrical integrity of the motor windings. To do this, you will need a multimeter (tester) switched to resistance measurement mode (Ohms). On the compressor body you will find three contacts covered by a terminal block.
Remove the block and find the contacts. They are usually arranged in a triangle. You need to call pairs of contacts. The resistance between the working and starting windings, as well as between the common and each of them, must be within certain limits. For household compressors Atlant a resistance of 10 to 30 Ohms is considered normal for the operating winding and slightly higher for the starting winding.
| Pair of contacts | Normal resistance (Ohm) | Possible malfunction |
|---|---|---|
| Working - General | 10 - 25 Ohm | Open or short circuit |
| Starting - General | 15 - 35 Ohm | Open or short circuit |
| Case - Any contact | Infinity (∞) | Breakdown to the case |
The most critical parameter is the resistance between any of the contacts and the copper tube or compressor housing. The multimeter should show infinity (one in the most significant digit). If the device shows any values (even large ones), it means that something happened insulation breakdown on the housing. Operating such a unit is deadly!
⚠️ Attention: If the multimeter shows a resistance close to zero between the windings, this indicates an interturn short circuit. A compressor with such a malfunction will not work, and when trying to start it will hum strongly and knock out the machines.
Analysis of the operation of the motor when connected to the network
If the electrical part is normal, you can conduct a short-term test run. Be careful: this procedure is carried out under voltage of 220 Volts. Connect the refrigerator to the network and listen to the sounds that the compressor makes in the first seconds.
Normal operation is characterized by a quiet, uniform hum 1-3 seconds after switching on. If you hear a loud humming noise that stops abruptly after a few seconds (relay clicking) and repeats in a cyclic manner, this indicates that the engine is trying to start but cannot. The reasons may be jamming of the piston group or insufficient voltage in the network.
- 🔊 Quiet hum and vibration - the compressor is working normally.
- 🔊 Loud metal clanging - internal mechanical destruction of the unit is possible.
- 🔊 A hum followed by a click and silence is a problem with starting (relay, windings, wedge).
- 🔊 Complete silence - there is no power or the winding has burned out.
It is important not to keep the refrigerator turned on in this mode for more than 10-15 minutes, so as not to burn out a working relay or permanently damage the windings. If the engine hums but does not start, sometimes the “warm-up” method helps, but it is applicable only to experienced craftsmen.
Compressor warm-up method
The essence of the method is to heat the lower part of the compressor housing with a hair dryer or a powerful lamp for 15-20 minutes. This can liquefy congealed oil or loosen jammed parts. However, if there is mechanical scuffing inside, warming up will not help, but will only worsen the situation.
Checking the pressure and tightness of the system
Electrical service does not guarantee that the compressor is pumping freon. The motor can work perfectly, but due to broken valves, it cannot create the necessary pressure. To check this parameter, you will need a pressure gauge station, but there is also a popular “finger” method.
Disconnect the capillary tube or pressure tube (be careful, there may be residual pressure there!). When the compressor is turned on, a strong air flow should be felt from the outlet. If you put your finger near the hole, the stream should blow it out confidently. Weak exhalation indicates wear of the valve group.
It is also worth checking the system for leaks if there is a suspicion of a leak. There should be no oil stains in places of possible leaks (welds, joints). Oil in refrigerators Atlant often acts as an indicator, since it circulates along with freon.
☑️ Full diagnostic checklist
Typical malfunctions of Atlant compressors
Analyzing repair statistics, we can identify several typical problems specific to this brand. Knowing these nuances will help you make a diagnosis faster. Most often, owners are faced with failure of the starting relay due to power surges in the network.
The second place is taken by turn-to-turn short circuit windings, which often happens after prolonged operation in abnormal mode or when there is poor ventilation of the condenser at the back of the refrigerator. The third common problem is loss of performance (compression) due to natural wear and tear after 10-12 years of operation.
Less common, but breakage of internal wiring or jamming of the motor shaft occurs. In the latter case, the compressor emits a characteristic metallic knock or hum that turns into vibration, but the shaft does not rotate. Repairing such a unit is not economically feasible.
⚠️ Attention: The characteristics and internal structure of compressors may vary slightly depending on the year of manufacture and the specific model of the Atlant refrigerator. Always check the markings on the nameplate with documentation or spare parts catalogs before ordering a replacement.
When a compressor replacement is necessary
If the diagnostics showed a breakdown in the housing, a break in the windings or a loss of compression, the only option is to replace the unit. Changing the compressor yourself only makes sense if you have the skills to work with refrigeration equipment, since you will need to evacuate the system and refill it with freon.
Simply “re-soldering” the motor without removing moisture and evacuation will lead to the fact that the new compressor will burn out in a few days or weeks. The moisture remaining in the system will react with oil and acids formed during the combustion of the old motor.
- 🛠 Breakdown of insulation on the housing - only replacement.
- 🛠 Breakage of windings - only replacement.
- 🛠 Loss of performance (slightly freezing) - replacement only.
- 🛠 Mechanical knocking and wedge - replacement only.
Therefore, if you do not plan to buy expensive equipment for refueling (vacuum pump, pressure gauges, scales, freon cylinder), it is better to limit yourself to diagnostics and call a professional for the final stage of work. This will save your nerves and the warranty on the new unit.
Frequently asked questions (FAQ)
Is it possible to repair the compressor of the Atlant refrigerator?
In domestic conditions, repairing the compressor itself (opening the housing, replacing the piston group) is impossible and impractical. They are hermetically sealed. The only repairable elements are the starting relay and the thermal relay, which are located outside.
Why does the compressor turn on for a couple of seconds and turn off?
This is the work of the thermal protection relay. It turns off the motor because the current consumption exceeds the norm. Reasons: faulty starting relay, jammed motor, turn-to-turn short circuit or low voltage in the network.
What kind of freon is used in Atlant refrigerators?
In older models, R12 was used, in newer ones - R134a, and in modern energy-efficient models - R600a (isobutane). The refrigerant type is indicated on the label on the back of the refrigerator. R600a is explosive, which requires special care during repairs.
How much does a new compressor cost for Atlanta?
The cost of a new compressor varies depending on the model and performance, but on average it is a significant part of the price of a new refrigerator. Together with the replacement work, the price can reach 50-70% of the cost of a new device.
Does a working compressor hum?
Yes, a working compressor produces a uniform low-frequency hum. However, it should not be loud, intermittent, or accompanied by clanging or knocking noises. The noise level also depends on the levelness of the installation of the refrigerator.