A sudden stop of the refrigerator Atlant often takes you by surprise, because it threatens food spoilage. The first sign of a malfunction is usually the absence of a characteristic hum of the motor or, conversely, its continuous operation without cooling the chambers. Compressor is the heart of the refrigeration unit, and it is with its diagnosis that you should begin searching for the problem if you decide to carry out the repair yourself.
Before picking up a multimeter, you need to exclude trivial reasons: check if there is voltage in the outlet, if the plug is intact and if the power cord is not broken. If everything is in order with the electricity in the house, and the unit is silent or makes strange clicks, then it’s time for diagnostics motor-compressor. It is important to understand that to accurately assess the condition of the unit, you will need a minimum set of tools, including measuring instruments.
In this article we will analyze in detail the algorithm of actions that will allow you to determine whether the motor is alive or it’s time to change it. You will learn how to safely get to the technical area, what parameters to measure and how to interpret the obtained values. Atlant refrigerators They are famous for their reliability, but even they are not immune from breakdowns, especially after many years of operation.
Primary visual and acoustic diagnostics
The check should begin without disassembling the unit. Listen carefully to the sounds your Atlant refrigerator emits when you try to turn it on. If you hear a quiet click, followed by a hum that lasts 3-5 seconds, and then a click that fades, this is a classic symptom of a starting problem. In such a situation, the culprit is often the starting relay or the compressor itself, which cannot overcome the initial resistance.
Inspect the back wall of the refrigerator in the area of the compressor. If you see traces of soot, melted plastic on the relay body or smell burnt insulation, further operation without repair is impossible. Visual inspection may immediately indicate a short circuit or overheating of the windings. Also pay attention to the temperature of the tubes: when working properly, one of them (discharge) should be hot, and the other (suction) should be cold or covered with frost.
⚠️ Attention: If you find traces of oil under the compressor or on the floor, this may indicate a depressurization of the system. In this case, it is absolutely impossible to start the compressor, since it operates in an oil environment and can burn out in seconds without lubrication.
Sometimes the problem lies not in the motor itself, but in the control system. Modern models Atlant equipped with electronics that can block startup in the event of sensor errors. If the fault indicator is on the display or the alarm light is blinking, try rebooting the device by unplugging it for 15 minutes. If after turning on the situation repeats, we proceed to an instrumental check.
Preparation for testing: tools and safety
To carry out high-quality diagnostics, you will need a basic kit for a home handyman. The main tool will be multimeter (tester), capable of measuring resistance (Ohm) and checking the integrity of the circuit (continuity). Without this device, checking the windings for interturn short circuits or breaks will be impossible, since it is impossible to determine the condition of the copper inside the stator by ear or appearance.
You will also need screwdrivers (Phillips and flathead) to remove the compressor protective casing and, possibly, pliers. Before starting any work, make sure that the refrigerator is completely disconnected from the power supply. Safety —priority number one, because you will be working with electrical components that could be energized.
Allow the compressor to cool down if it has just been running. Hot windings may have a different resistance, which will distort the readings of the device. Carefully remove the back cover at the bottom of the refrigerator to gain access to the motor. It is usually secured with latches or several screws.
☑️ Tools for testing
Clean the space around the compressor from dust and cobwebs so that nothing interferes with the view and access to the contact group. On the motor body you will see a black plastic box - this is the starting relay, to which the power wires fit. It is from this area that the technical part of the test will begin.
Removing the start relay and access to the contacts
To check it yourself compressor, you need to temporarily disconnect the start-protective relay. It is put directly on the terminals of the windings and is fixed with a metal bracket-bar or plastic latches. Be careful: the wires can become fragile over time, so avoid sudden jerks.
First remove the retaining bar. Then carefully disconnect the connector going from the relay to the compressor. In some models Atlant the wires may be soldered, but in most cases a removable block is used. If the wires are soldered, you will have to carefully bite them off with a side cutter, leaving a reserve for subsequent soldering if the motor turns out to be in good order.
After removing the relay, you will see three terminals arranged in a triangle. These are the winding contacts: two working and one common. There may be markings on the compressor housing near the terminals, but most often they are erased or missing, so you will have to rely on the location diagram. Usually the common terminal is located separately, and the other two are next to each other.
⚠️ Warning: Never attempt to remove the relay while the power cord is plugged into the outlet. Even if the refrigerator is turned off with the button, voltage may remain in the circuit. Complete disconnection from the network is mandatory!
Now that you have gained access to the contacts, you can begin measurements. It is the state of these three terminals that will tell us about the health of the internal windings of the motor. If the leads are oxidized or covered with soot, they should be carefully cleaned with fine sandpaper before testing to ensure reliable contact of the multimeter probes.
Checking the integrity of the windings with a multimeter
The most important stage of diagnosis is measurement resistance of the windings. Switch the multimeter to resistance measurement mode (limit 2 kOhm or 20 kOhm). First check each pair of contacts with each other. For a working compressor, the resistance between any two terminals should not be infinite (open) or zero (short circuit).
Normal resistance values for different models Atlant may differ, but there are approximate ranges. The resistance of the starting winding is usually higher (30-40 Ohms), and the working winding is lower (10-15 Ohms). The total resistance between the extreme contacts should be approximately equal to the sum of the resistances through the common wire. If the device shows “1” (infinity) in any of the sections, it means that the winding is burned out or broken.
Next, you need to check the breakdown on the housing. Set the multimeter to dial mode (with a sound signal) or resistance measurement to the maximum limit. Press one probe to any of the three contacts, and the second to the metal part of the compressor housing or copper tube that has been stripped of paint. The device should not emit a beep, and the needle (or numbers) should not move from zero or infinity.
What to do if the readings “float”?
If the resistance of the windings changes in real time while you are holding the probes, this is a sign of an interturn short circuit. The motor may start, but will get very hot and burn out quickly. Such a compressor requires replacement.
It is convenient to summarize the measurement results in a table for comparison. This will help you understand what condition your unit is in.
| Measurement type | Normal value | Failure sign | Action |
|---|---|---|---|
| Working winding | 10 - 20 Ohm | Infinity or 0 Ohm | Replacing the compressor |
| Start winding | 25 - 45 Ohm | Infinity or 0 Ohm | Replacement of the compressor |
| Fault to the housing | Infinity | Any resistance value | Urgent replacement (dangerous!) |
| Total R | R1 + R2 | Strong discrepancy | Contact diagnostics |
If all values are normal and there is no breakdown on the housing, the electrical part of the motor is most likely in good condition. However, this does not guarantee that the compressor will be able to start under load. Mechanical wedge piston group can block starting even with intact windings.
Checking the starting relay and protection against wedge
Often the reason for the silence of the refrigerator Atlant It is not the motor itself, but a failed starting relay. This device supplies a powerful impulse to the starting winding to start the rotor. If the relay is faulty, the motor will only hum, trying to start, but rotation will not occur.
You can check the relay by shaking it near your ear. If you hear the sound of broken parts inside, the element definitely needs to be replaced. Also check the contacts inside the relay for carbon deposits. If they turn black, current does not flow normally and starting is impossible. Replacing the relay is an inexpensive procedure and often solves the problem without replacing the compressor.
There is a method of direct voltage supply (the so-called "power supply from an outlet" through a button), which allows you to check the ability of the motor to start without a relay. Only experienced craftsmen can use this method, as there is a risk of electric shock and damage to the compressor if the phasing is incorrect. If, with direct supply, the motor starts and runs, then the problem was in the relay or thermostat.
⚠️ Attention: Direct connection to a 220V network bypasses thermal protection. Keep your finger on the button for no more than 3-5 seconds. If the motor does not start or makes a loud hum, immediately turn off the power, otherwise the windings will burn out.
If the motor does not start even with a direct voltage supply, but the windings are intact, there is a high probability of mechanical jamming. In this case, no repair work will help - a complete replacement of the unit with a new or used one is required.
Diagnostics of pressure and system tightness
Electrical service is only half the success. The compressor may hum and even rotate, but not create the necessary pressure refrigerant for circulation. This occurs when the valve group or pistons wear out. It is difficult to check this at home without a pressure gauge station, but you can try to estimate it indirectly.
When you turn on a working compressor, you should feel with your hand how quickly the discharge tube (the one that comes out of the top of the motor) heats up. If the motor has been running for 10-15 minutes, and the tube remains barely warm or cold, then there is no compression. Freon does not compress and does not circulate through the system.
It is also worth checking the system for leaks. If there is a leak in the tubes or condenser, the compressor will run continuously, trying to get the temperature up, but there will be no cold. You can detect a leak by oily stains in the soldering areas or a characteristic hissing if you wipe the area of the suspected leak with a soap solution (bubbles will appear).
To accurately diagnose pressure, it is necessary to connect pressure gauges to the service fitting. Normal suction pressure should be in the region of 0.1-0.12 MPa, and discharge pressure should reach 1.5-2.0 MPa and higher, depending on the model. If the pressure gauge needle on the discharge barely rises, the motor “does not pull.”
Common mistakes during self-diagnosis
Many owners Atlant refrigerators make typical mistakes, trying to save on calling a technician. One of the most common is replacing the compressor without checking the remaining elements of the system. If there is acid or combustion products left in the system from the old motor, the new unit will burn out in a few months.
Another mistake is ignoring the condition of the heat exchanger. If the condenser (grid at the back) is clogged with dust or pressed against the wall, the compressor will overheat and go into protection. Before sinning on the motor, make sure that the refrigerator is at least 10 cm from the wall and is well ventilated.
Also, do not try to “revive” the compressor by tapping or heating. These methods, which are popular beliefs, in 99% of cases only lead to the final breakdown of the unit. Modern technology requires accurate diagnostics, and not mechanical action.
Is it possible to replace an Atlant compressor with an analogue of another brand?
Technically, this is possible if the dimensions, power and refrigerant (freon) are the same. However, manufacturers recommend using original spare parts or certified analogues (for example, Danfoss, Secop), since they are guaranteed to be suitable for mounting feet and electrical parameters. Installing an unsuitable motor can lead to vibrations and rapid failure.
Why did the new compressor immediately turn on and off?
This may indicate a lack of freon in the system (overheat or low pressure protection has tripped), a malfunction of the starting relay that does not hold contact, or an error when connecting the windings. Also, the reason may be a clogged capillary or filter drier.
How much does it cost to replace a compressor in an Atlant refrigerator?
The cost consists of the price of the unit itself (from 4,000 to 9,000 rubles, depending on the model) and the work of the technician (from 3,000 to 6,000 rubles). You will also need to pay for travel, refilling with freon and replacing the filter drier. The total amount often makes up a significant part of the cost of a new refrigerator.
Does a working compressor hum?
Yes, a working motor makes a smooth, monotonous hum. Extraneous sounds should cause alarm: clanging, knocking, ringing of metal, sharp clicks during operation, or an excessively loud, strained hum that turns into vibration.