A sudden stop in the operation of refrigeration equipment often takes you by surprise, especially if there are perishable products inside. Owners of equipment Atlant are often faced with a situation where the compressor hums but does not start, or, conversely, makes clicks and goes silent. In most such cases, the culprit is a faulty starting relay, which is responsible for starting the engine.
Independent replacement of this unit is a very real task for a person who knows how to hold a screwdriver in his hands and follows safety precautions. Relay It is a compact plastic block that is attached directly to the compressor housing. Its dismantling does not require special knowledge or complex tools, but it does require attention to detail and the correct order of actions.
Before starting disassembly, you need to make sure that the problem lies precisely in the starting mechanism, and not in the lack of electricity or breakdown of the motor itself. If you hear a characteristic click, followed by a hum that lasts a few seconds, and then another click and silence, this is a sure sign that starting relay requires replacement or inspection. Ignoring the problem can lead to overheating of the compressor windings and its expensive repair.
Diagnostics of a faulty starting device
The first step in any repair is an accurate diagnosis. Do not rush to disassemble the unit until you are sure that the reason lies in the electrical part of the start. Refrigerators Atlant are equipped with a reliable protection system, but it is the relay that takes the brunt of power surges. Symptoms of a malfunction can vary: from a complete lack of response to being plugged into the network to chaotic startup attempts.
Visual inspection often helps to identify obvious signs of damage. If traces of burning, melting are visible on the plastic body, or characteristic odors are felt, then the question “how to remove the relay from the Atlant refrigerator” becomes the main one. However, external signs are not always there. Often the device looks intact, but the coil inside is burnt out or the contacts are stuck. For an accurate check with a multimeter, you need to remove the part from the case.
⚠️ Attention: Before any manipulations with electrical components, be sure to unplug the refrigerator! Working under voltage is deadly.
Checking with a multimeter allows you to determine the integrity of the windings. In good condition, the resistance between the contacts should be within normal limits, usually several ohms. If the device shows an open or short circuit, the part must be replaced. It is also worth checking the thermal protection, which is often built into the same housing as the starter.
Preparation of tools and workplace
To successfully complete the task of dismantling the relay, you do not need a professional workbench or a complex set of tools. It is enough to prepare a minimum set that can be found in the drawer of any home craftsman. The main thing is to provide yourself with free access to the rear wall of the unit and good lighting of the working area.
You will need the following tools and materials:
- 🔧 Flat and Phillips screwdrivers for removing protective covers.
- 🔧 Pliers or side cutters for working with wires (if will be required).
- 🔧 Multimeter to check electrical characteristics.
- 🔧 Flashlight or lamp to illuminate the compressor compartment.
- 🔧 Dry rags for cleaning contacts from dust and oxides.
Organize the space so that nothing interferes with movement. If you have a model with a bottom-mounted compressor, you may have to move the refrigerator away from the wall or even lay it on its side. In the latter case, be careful: do not place the unit on its side, where the freon pipes are located, or on the back wall with an open radiator, so as not to damage the cooling system.
Access to the compressor and removal of the protective casing
The process of how to remove the relay from the Atlant refrigerator begins with providing access to the motor-compressor. In most models Atlant the compressor is located in the lower rear part of the housing and is covered with a metal or plastic casing. This casing protects the mechanism from dust, moisture and accidental mechanical damage.
To remove the casing, it is usually enough to unscrew a few screws around the perimeter or loosen the clamps, if the design allows. In some modern models, the casing may be held in place by latches. Be careful not to break the plastic clips, which become brittle over time. After removing the screws, carefully move the cover to the side.
Under the casing you will see the compressor itself - a black metal “tank” with copper tubes extending from it. On the side or bottom of the compressor housing, where three electrical contacts come out, the desired device is installed. It is this unit that needs to be approached in order to carry out the replacement.
| Atlant model | Compressor location | Casing mounting type | Access features |
|---|---|---|---|
| MHM 1700 series | Bottom, rear | Screws (4 pcs.) | Requires complete dismantling of the cover |
| MHM 2800 series | Bottom, rear | Latch + screws | Partial bending is possible |
| MHM 4000 series | Bottom, back | Screws | Standard access |
| MXM 6000 series | Bottom, rear | Clamp/Screws | Enlarged casing |
Starting relay removal technology
The most critical stage is the direct disconnection of the part from the compressor. The starting relay on refrigerators Atlant is put on three pins coming out of the compressor housing. It is fixed either by a tight fit or by an additional metal bracket-like clamp (frame) that covers the relay and presses it to the motor.
If there is a metal retaining frame, it must be carefully removed. To do this, use a flathead screwdriver to lightly press the frame antennae and remove it upward or to the side, depending on the design. Do not use excessive force so as not to bend the frame and damage the compressor tubes.
After removing the retainer, take the relay by the body and with rocking movements (left-right, up-down) pull it off the pins. Contact may be slightly oxidized, so the part may fit tightly. The main thing is not to pull the wires, as you can break them at the very base or damage the internal insulation.
☑️ Algorithm for removing the relay
When the relay is removed from the compressor pins, wires can still be connected to it through terminal blocks. Usually there are two or three. Carefully remove the terminals, holding the wire itself at the base so as not to damage the wires. If the terminals are stuck, you can slightly warm them with a hairdryer or carefully clean the contacts.
Analysis of the removed part and search for the causes of the breakdown
Once the device is in your hands, it is worth carrying out an external inspection. Shake the relay near your ear: if a knock is heard inside, it means that the core has broken or a part of the mechanism has broken off - this is a guaranteed cause of the malfunction. Also pay attention to the condition of the plastic case: blackening indicates overheating.
Inside the case there are two main components: a trigger coil and thermal protection. The starting coil creates a magnetic field to start the rotor, and thermal protection turns off the motor if overloaded. Often it is the trigger mechanism that fails, which stops opening the circuit after starting, which leads to a buzzing sound and tripping of the protection.
⚠️ Attention: If you find traces of moisture or oil inside the relay, this may indicate a more serious problem - a freon or oil leak from the compressor. In this case, simply replacing the relay is not enough; diagnostics of the system's tightness is required.
Checking with a multimeter in resistance measurement mode (Ohm) will help to finally confirm the diagnosis. Ring the contacts: there should be resistance between certain pairs, and an open circuit between others (depending on the type of relay - posistor or induction). For models Atlant most often, posistor relays are used, which, when heated, sharply increase the resistance, opening the starting winding.
Why does the relay burn out?
A frequent cause of relay burning is power surges in the network or problems with the compressor itself (turn-to-turn short circuit). If you are changing the relay for the second time in a short period of time, it is worth checking the voltage in the socket and the condition of the motor windings.
Installing a new relay and checking operation
Installing a new part is done in the reverse order. Make sure you purchase a relay with the exact same specifications. The body is usually marked (for example, RTK-N, R-3, R-4 or imported analogues). An incorrectly selected relay may not start the compressor or, worse, burn the motor windings.
Place the wire terminals onto the corresponding contacts of the new relay. Usually they have a unique shape, it is difficult to confuse them, but it is better to photograph the connection diagram in advance. Then carefully push the relay onto the compressor pins as far as it will go. Make sure that it fits tightly and evenly, without distortions.
Reinstall the metal retainer (frame), if it was in the structure. After this, you can temporarily (without screwing in the screws) install the casing, turn on the refrigerator and listen. The startup should occur with a quiet click, followed by a smooth hum of the running motor. If the compressor starts up and begins to cool, the assembly can be completed.
Frequent replacement mistakes and precautions
One of the most common mistakes is ignoring cleaning the contacts. When installing a new relay on old, oxidized wires, the contact may be unstable, which will lead to repeated failure. Always clean the terminals to a metallic shine before connecting.
Also, technicians often forget to check the condition of the compressor itself. If the motor is “stuck” mechanically, the new relay will click, but will not be able to start the engine, and will eventually burn out too. Therefore, if after replacing the relay the situation has not changed, the problem is deeper and requires calling a specialist with professional equipment.
Do not forget about safety. Work only with dry hands and dry shoes. If you smell a burning smell immediately after turning it on, immediately unplug the appliance. This may mean a short circuit or an error in connecting the wires.
Is it possible to repair an old relay, or is it only necessary to replace it?
In most cases, repairing an old relay is not economically feasible and is technically difficult for domestic conditions. Inside there are calibrated elements that are difficult to restore. However, if the problem was only oxidation of the external contacts, cleaning them can temporarily revive the device. But for reliable operation, a complete replacement is recommended.
Where can I find the markings of a suitable relay for my Atlant?
The markings are applied directly to the plastic body of the removed device. Look for abbreviations like RTK, R-3, R-4, DR-3 and numbers indicating power or current. Also, the spare part number can be found in the technical documentation of the refrigerator or on the nameplate on the back.
Why does the new relay click, but the refrigerator does not freeze?
If you hear a start-up click, but the compressor does not hum or vibrate, the compressor itself may be faulty (winding breakage) or there is no starting torque. If the compressor hums, but does not start and clicks after a while, the relay may be selected incorrectly or the motor starting winding is faulty.
How long does it take to replace the relay with your own hands?
For an experienced technician, this process takes 10-15 minutes. For a beginner who is faced with the task of “how to remove a relay from an Atlant refrigerator” for the first time, the entire procedure, including diagnostics and searching for tools, can take about 40-60 minutes.