A sudden stop of the compressor or a characteristic clicking sound, after which the refrigerator Atlant stops freezing, often indicates a malfunction of the starting mechanism. Owners of household appliances are faced with a situation where the motor tries to start, emits a beep, but then a click is heard and the unit goes silent again. It is at this moment that the protective and starting equipment comes into operation, which in this case could fail. If you notice similar symptoms, then most likely the problem lies in the start-up relay, which is responsible for supplying a starting pulse to the motor winding.
Self-diagnosis of this unit is a process quite accessible even for those who are not professional electricians, but requires care and compliance with safety precautions. Start relay is a compact device mounted directly on the compressor housing. Its main task is to briefly apply voltage to the starting winding of the electric motor so that the rotor begins to rotate. After the engine reaches the required speed, the relay opens the circuit and the compressor continues to operate on the main winding. If this mechanism is broken, starting becomes impossible, which leads to damage to the food and requires immediate intervention.
Before proceeding with disassembly, you must completely turn off the power to the refrigerator Atlantby unplugging the power cord from the outlet. This is a critical condition because working with live electrical components is prohibited. In this article we will look in detail at how to determine a malfunction, what tools are needed for testing, and what to look for when visually inspecting contacts. Understanding the operating principle of this unit will help you accurately diagnose the problem and avoid unnecessary costs of calling a technician to simply replace the part.
⚠️ Attention: Before starting any diagnostic work, make sure that the refrigerator is disconnected from the power supply for at least 10-15 minutes. This is necessary in order for the capacitors to discharge and the hot elements of the compressor to cool down, which will eliminate the risk of burns or electric shock.
The principle of operation and types of relays in Atlant refrigerators
To perform a quality check, you need to understand what type of device you are dealing with. In Belarusian refrigerators Atlant most often, electromagnetic starting relays are installed, although in older or specific models there may be other options. Electromagnetic relay works due to the current flowing through the coil: when starting, the current is high, the magnetic field draws in the core, closing the starting circuit. When the engine speed increases, the current drops, and the core, under the influence of gravity (or a spring), returns to its original position, opening the contacts.
There are also thermal protection relays, which are often structurally combined with starting ones in one housing, forming starting protection device. Their task is to break the power circuit if the current exceeds permissible limits or if the compressor housing overheats. Inside such a device there is a bimetallic plate that bends when heated and opens the contacts. In models Atlant these components can be separated or combined, which is important to consider when searching for spare parts. It is critically important to accurately determine the relay model, since they are not always interchangeable even within the same brand.
The malfunction may be contact sticking, coil breakage or bimetallic strip deformation. If the contacts are burnt, they may not open, which will lead to the starting winding operating in constant mode and rapid combustion of the engine. Conversely, if the contacts are oxidized and do not close, the engine will hum but will not start. Understanding these physical processes allows you not just to change parts at random, but to carry out targeted diagnostics of the state of the electrical circuit.
External inspection and initial diagnosis without tools
The first stage of testing should always be a thorough visual inspection. Remove the rear protective panel of the refrigerator Atlantto gain access to the compressor. The start relay is usually mounted on the side or rear of the motor and covered with a plastic casing. Carefully remove the casing and disconnect the wires, having previously photographed their location so as not to mix up the contacts during assembly. Visual inspection can immediately answer the question about the cause of the breakdown if the damage is obvious.
Carefully Inspect the relay housing for melting, blackening or cracks. If the plastic is deformed, this indicates overheating caused by a short circuit or poor contact inside. Also check the condition of the wires: they should be intact, without traces of insulation or oxidation on the terminals. Often the cause of unstable operation is an oxidized contact, which creates additional resistance and prevents the compressor from starting normally.
After disconnecting the wires, remove the relay from the compressor contacts. Shake it near your ear: if you hear knocking or rattling inside, this is a bad sign. The entire electromagnetic relay should not make sounds when shaking, since its core is rigidly fixed. The presence of a knock indicates that the mechanism is destroyed, the core is dangling and cannot perform its function of closing the circuit. In this case, further checking with a multimeter may no longer be necessary - the part requires replacement.
- 🔍 Inspect the case for traces of burning, melting or swelling of the plastic.
- ⚡ Check the terminals and wires for the absence of oxides, rust and insulation damage.
- 🔊 Shake relay: the absence of extraneous sounds indicates the integrity of the internal mechanism.
- 📸 Take a photo of the connection before dismantling to avoid errors during assembly.
⚠️ Attention: If you find traces of soot or a burning smell in the relay area, be sure to check the condition of the compressor windings. Often, a burnt-out relay is a consequence, not a cause, and the problem may lie in an interturn short circuit in the motor.
Instrumental testing with a multimeter
The most accurate diagnostic method is to check the electrical resistance using a multimeter. To do this, switch the device to resistance measurement mode (Ohm). First you need to check the circuit between the relay input contacts that are connected to the network. In normal condition, the resistance should be close to zero or several ohms, which indicates the integrity of the circuit. If the device shows infinity (one in the most significant digit), then a break has occurred.
Next, we check the coil and contacts controlled by the core. For electromagnetic relays, it is important to check the coil resistance - it must correspond to the technical characteristics of the specific model, usually in the range from 10 to 100 Ohms depending on the compressor power Atlant. If the coil resistance is too high or zero (short circuit), the relay is faulty. The thermal protection is also checked: in a cold state, its contacts must be closed (resistance close to 0 Ohm).
Pay special attention to checking the contacts that close during startup. In the initial position (relay in hand, contacts pointing down) they can be open. However, if you turn the relay over as it is on the compressor (the core should retract), the contacts should close. By testing them with a multimeter in this position, you will be convinced of their functionality. Faulty contacts often expressed in high contact resistance, which the multimeter may not show accurately, but which prevents the passage of starting current.
☑️ Diagnostics multimeter
The dynamics of operation - exactly how the contacts open when heated or when the current changes - is difficult to check without a special stand. Therefore, if there are no visual defects, but the refrigerator does not start, and the multimeter shows “normal”, it is often easier and cheaper to replace the relay with a new one than to look for microscopic defects in the old contacts.
Table of typical values and symptoms of malfunctions
For ease of diagnosis, below is a table that will help compare the observed symptoms with probable causes and instrument readings. These values are averaged for most models of compressors installed on refrigerators. data-i="102">The compressor hums and clicks, but does not start Atlant.
| Symptom | Probable Cause | Multimeter readings | Action |
|---|---|---|---|
| The compressor hums and clicks, but does not start | The piston group is jammed or the starting relay is burned out | The relay coil resistance is normal or broken | Replacing the relay, checking the compressor |
| The refrigerator turns on for 5-10 seconds and turns off | Thermal protection is triggered | Thermal protection rings when cold | Checking the compressor current, replacing the relay |
| A cracking sound is heard inside the relay when shaking | The core mechanism is destroyed | Not applicable (mechanical defect) | Urgent replacement of the relay |
| The compressor runs continuously, not turning off | The contacts of the starting relay are stuck | The contacts are constantly closed | Replacing the relay to avoid burning out the motor |
Analyzing the data in the table, we can conclude that most starting problems can be solved by replacing the starting protection devices. However, if after replacing the relay the situation repeats (the new element burns out or the refrigerator does not start again), the problem lies deeper - in the compressor itself or the wiring. Continuous combustion relay - this is a signal that the motor is consuming too much current, possibly due to wear of the bearings or inter-turn short circuit of the windings.
Why does a new relay burn out immediately after installation?
This happens if the compressor has a high starting winding resistance or is mechanically jammed. The engine cannot spin up, the current does not drop, and the thermal protection does not have time to operate before the contacts of the starting relay are welded or burnt out from overload.
Replacement process and installation features
If diagnostics have confirmed a malfunction, it is necessary to make a replacement. You can buy a new relay in spare parts stores for household appliances, indicating the model of your refrigerator Atlant or the number of the old relay. The installation process begins with the reverse of dismantling: remove the old device by carefully disconnecting the wires. Pay attention to the condition of the block that is put on the compressor contacts - it should not be melted or cracked.
The new relay is put on the compressor contacts until a characteristic click is heard. It is important to maintain orientation in space: on the body of almost all relays there is a marking of the upper position (up arrow or TOP inscription). Orientation is critical for electromagnetic models, since the core must move under the influence of gravity. If you install the relay upside down, the core will not lower and open the starting winding, which will lead to rapid failure of the motor.
After installation, connect the wires according to the photograph or diagram taken earlier. Color coding is usually used, but it is better to double-check the contacts. Attach the protective cover and plastic cover. Only after complete assembly can you plug in the refrigerator. The first minutes of work should be spent next to the unit, listening to the start-up sound: it should be smooth, without buzzing or clicking.
- 🛠️ Make sure that the block fits tightly on the compressor contacts and does not loosen.
- 🧭 Strictly observe the “Top” position when installing the relay on the compressor.
- 🔌 Check that all wires are securely fixed in the terminals before turning on.
- 👂 Listen to the first startup: it should go quietly and quickly.
⚠️ Attention: The technical characteristics of the relay may vary slightly in different batches or modifications. If you are replacing a relay with an analogue from another manufacturer, make sure that its current characteristics match the original, otherwise the protection may operate falsely or not operate at all.
Frequent diagnostic errors and expert advice
When repairing refrigerators on their own Atlant beginners often make typical mistakes that complicate the process or lead to new breakdowns. One of the most common is trying to clean the contacts of an old relay with sandpaper. This is strictly forbidden: the coating of the contacts (often silver or special alloys) is damaged, and in the future they will oxidize even faster, and the current will flow worse. The relay is a disposable element that cannot be repaired.
Another mistake is ignoring the condition of the capacitor. Many circuits have a capacitor connected in parallel with the starting winding, which helps create a phase shift for starting. If the capacitor is swollen or has lost capacity, even a working relay will not be able to start the engine. Therefore, when replacing the relay, always check the capacitor, especially if the refrigerator is more than 10 years old.
Also, do not try to start the compressor bypassing the relay by applying voltage directly to the starting winding manually. This method ("spin by hand" or with a button) is dangerous and can lead to electric shock or damage to the windings if the phase is incorrectly selected. Modern compressors require a precise time interval for the operation of the starting winding, which can only be provided by a working automatic relay.
Conclusion and prevention of repeated breakdowns
Checking and replacing the relay on the refrigerator Atlant is a task that can really be done at home if availability of a minimum set of tools and understanding of the basics of electrical engineering. Timely diagnostics allows you to prevent more serious breakdowns, such as compressor combustion, the cost of which is disproportionately higher than the price of the starting device. Regular inspection of the rear panel of the refrigerator for dust and dirt will also extend the life of all components of the unit.
If, after replacing the relay and checking the capacitor, the refrigerator still does not start or the machine in the apartment breaks down, the problem lies in the compressor itself. In this case, further independent repairs are impractical and require the intervention of specialists with professional equipment to overhaul the motor or replace it. Remember that the safe operation of household appliances depends on the serviceability of each of its elements.
Is it possible to use a relay from another refrigerator, for example, from Indesit or LG?
You can use relays from other brands only if their technical characteristics (rated current, coil voltage, connection type) completely coincide with the original for Atlant. However, the design of the housing and the block may differ, which will require alteration of the wiring, which is not recommended to be done without experience.
Why does the new relay burn out a few days after replacement?
This is a sure sign of a malfunction of the compressor itself. Most likely, the geometry of the cylinders is broken, the bearings are worn out, or there is an interturn short circuit, due to which the engine consumes excess current, which melts the contacts of the new relay.
How often do you need to change the starting relay in the refrigerator?
The relay does not have a scheduled replacement period and serves until a malfunction occurs. On average, a high-quality component in refrigerators Atlant lasts 10-15 years. Frequent power surges in the network can shorten this period.
Is it dangerous to operate a refrigerator with a faulty relay?
Yes, it is dangerous. In addition to the risk of food damage, a faulty relay can lead to a fire due to overheating of the wiring or compressor housing, as well as the final failure of an expensive engine.