A sudden stop of the compressor or a characteristic clicking sound when turned on often indicates a failure of the start relay. This small part plays a critical role in starting the motor by providing a starting impulse to the winding. If your refrigerator Atlant stops freezing, and the motor hums but does not start, or clicks and immediately goes silent, the problem most likely lies here.
Replacing this element on your own is a completely solvable task for a person who has basic skills in working with tools. The main thing in this process is not only to physically install the new part, but also to install it correctly connect, observing the polarity and sequence of actions. Errors at this stage can lead to repeated breakdown or even burning of the compressor windings, so it is important to act carefully.
In this article we will analyze in detail the entire diagnostic and replacement process. You will learn how to remove the old relay, how to determine the correct orientation of the contacts and what safety measures must be observed. The starting relay of the Atlant refrigerator is not a universal part, and when replacing it is important to take into account the markings and type of connection that corresponds to the specific model of your unit. Compliance with all technical nuances will allow you to return the equipment to life without calling a specialist.
Fault diagnosis: why the relay stopped working
Before starting disassembly, you need to make sure that the problem is really in the starting device. Often the symptoms may be similar to a breakdown of the compressor or thermostat itself. The main sign of a malfunction is a characteristic sound: the engine tries to start, a loud click is heard, followed by silence or another attempt after a while. This indicates that starting winding does not receive the necessary impulse.
Visual inspection can also tell an experienced repairman a lot. If traces of burning, melting of plastic or oxidation of contacts are visible inside the relay housing, then replacement is necessary in any case. Sometimes the cause is not the relay itself, but a current overload caused by jamming of the piston group of the compressor, but most often it is the thermoelement or inductive coil inside the plastic case that fails.
⚠️ Attention: Before any manipulations with the electrical part of the refrigerator, be sure to disconnect it from the network! Working under voltage is strictly prohibited and is life-threatening. Make sure that the plug is unplugged from the socket.
It is also worth checking the condition of the wires going to the relay. It often happens that due to vibration during engine operation, the contacts oxidize or the wire breaks at the very entrance to the housing. If no visual defects are detected, you will need to test the elements with a multimeter, which is the most reliable way diagnostics of an electrical circuit.
It is important to understand that the starting relay in refrigerators Atlant can be made in different design options. There are both classic induction models and more modern posistor models. Not only the principle of its operation, but also the testing method depends on the type of device. Induction relays operate due to an electromagnetic coil, and posistor relays operate by changing the resistance of the heating element.
Necessary tools and safety measures
To successfully replace the start relay, you will need a minimum set of tools that most men have in their home. First of all, these are screwdrivers: flat and Phillips. They will be needed to remove the rear protective panel and dismantle the clamps securing the compressor casing. It will not be possible to carry out work without access to the motor.
The second important tool will be a multimeter (tester). With its help, you can check the integrity of the motor windings and make sure that the new relay is working properly before installation. Pliers for removing terminals and a knife for stripping contacts may also be useful if oxidation is found on them. A flashlight will also be useful, since the compressor niche is often dark.
- 🔧 Screwdrivers (flat and Phillips) for dismantling panels.
- 🔌 Multimeter for checking the electrical circuit.
- 🧤 Dielectric gloves to protect hands.
- 🔦 Flashlight for illuminating the work area.
Particular attention should be paid to preparing the workplace. The refrigerator must be moved away from the wall, allowing easy access to the rear. If the floor is slippery, it is better to lay a rug or cardboard. It is also recommended to wear gloves to avoid getting your hands dirty with technical oil or getting injured on the sharp edges of metal elements.
Do not forget that refrigerant circulates inside the system. Although there is no one in the start relay, damage to the copper tubes due to careless handling of the tool can lead to freon leakage. Therefore, all movements must be confident, but careful. Safety is not just a word, but a prerequisite for repairs.
Removing the old start relay: step-by-step algorithm
The dismantling process begins with removing the rear protective panel of the refrigerator. Usually it is attached to several screws around the perimeter. After unscrewing them, the panel can be easily removed, providing access to the compressor. At the bottom of the motor you will see a black or gray plastic box - this is the start-up relay.
The relay is attached directly to the compressor terminals and can be additionally fixed with a metal bracket or spring. If there is a fixing bracket, it must be carefully pressed or unscrewed. Then the relay body must be slightly shaken and removed from the motor contact pins. Sudden movements are unacceptable here, so as not to damage the tubes or the motor itself.
After physically removing the relay, it is necessary to disconnect the wires. They fit into the device through a connector or terminals. It is important to remember or take a photo of which wire is connected where. Usually there are two or three of them, and they cannot be mixed up during assembly. For reliability, you can mark the wires with a marker or use a color scheme.
☑️ Procedure for dismantling the relay
If the relay has a complex structure or the wires go through additional clamps, proceed carefully. Sometimes it is necessary to release the plastic housing clamps to gain access to the internal terminals. The main thing is not to use excessive force, as the plastic becomes brittle over time and may burst.
Connection diagram and contact marking
The most crucial moment is the correct connection of the new relay. There is always a marking on the device body indicating which contact is responsible for what. Usually these are letters R, S and C (or L). Understanding this abbreviation is critical for the correct operation of the refrigerator.
The letter C (Common) denotes a common wire that comes directly from the network. Letter R (Run) is the working winding, and S (Start) is the starting winding. In different refrigerator models Atlant the location of these contacts may differ, so you need to focus on the markings stamped on the plastic or drawn on the diagram.
| Designation | Purpose | Wire color (most often) | Function |
|---|---|---|---|
C (or L) |
General contact | Red / White | Power supply |
R |
Working winding | Green / Black | Maintaining work |
S |
Starting winding | Yellow / Blue | Starting impulse |
When installing a new relay, make sure that it sits tightly on the compressor contacts and all the way. Distortions are unacceptable. If you are using a universal relay, carefully read the attached instructions, since the connection diagram may differ from the standard one. In such cases, it is often necessary to switch the wires inside the block.
What happens if you mix up the wires?
If you mix up the contacts of the starting and working windings, the compressor may hum, but not start, or start in the opposite direction (which is impossible for piston compressors and will lead to breakdown). In the worst case, the winding or the relay itself will burn out.
Pay attention to the orientation of the relay. The housing often has an arrow UP or inscription indicating that this side should face up. This is especially important for induction relays, where the movable core must move freely under the influence of gravity. Incorrect position will cause the contacts to stick.
Checking performance after installation
After all the wires are connected and the relay is in place, you can begin testing. Don't rush to close the back panel right away. Plug in the refrigerator and listen. After a few seconds, the engine should start confidently. A characteristic click at start is normal, it means the starting circuit is open.
If the motor starts and runs smoothly, without extraneous vibrations or humming, let it run for 10-15 minutes. Check the heating of the relay housing - it may get a little warm, but should not be so hot that it cannot be touched. Also check whether the connection wire itself is overheating.
- ✅ The engine started the first time.
- ✅ There is no buzzing or vibration.
- ✅ The relay housing does not overheat.
- ✅ Refrigerator began to gain temperature.
If the motor hums but does not start, immediately unplug the device. This means that the phase of the starting pulse does not match or the relay is faulty. Trying to start again may result in burnout of the windings. Check the connection diagram and marking compliance again.
Typical errors when connecting a relay
One of the most common mistakes is ignoring the orientation of the relay in space. As mentioned earlier, for many models Atlant the "arrow up" position is important. Installing the relay upside down will result in the mechanical core not lowering and opening the starting circuit, which will cause overheating and combustion of the coil.
Another common mistake is poor contact in the terminals. If you simply put the wires on without making sure the connection is tight, over time sparking and heating will occur at the contact point. This may lead to insulation melting and short circuit. Always check that the terminals are securely fastened.
⚠️ Attention: Never use a relay that is not designed for your compressor model, even if it appears to be the right size. Differences in actuation currents can lead to the fact that the relay will not open the circuit or, conversely, will not be able to start the motor.
Installing the relay without checking the condition of the compressor itself is also considered a mistake. If the motor has an interturn short circuit, the new relay will burn out almost instantly. Therefore, if after replacement the situation repeats, the problem is deeper and requires a professional diagnostics engine.
Frequently asked questions (FAQ)
Is it possible to install a universal relay instead of the original one?
Yes, in many cases this is possible. There are universal starting relays that fit most compressor models. However, it is important to choose a device with the appropriate power range (indicated in watts or amps). When installing a universal relay, carefully follow the instructions for switching the wires inside the block.
Why did the new relay burn out after a few minutes of operation?
This may indicate several problems: incorrect connection diagram, incorrect orientation of the relay, or a malfunction of the compressor itself (jamming or short-circuiting of the windings). A power surge in the network may also be the cause. In such cases, a repeated thorough check of the entire electrical circuit is required.
How can you tell whether a relay is inductive or posistor?
Induction relays are usually heavier, inside them you can hear the knocking of the moving core when shaking, and they have a coil. PTCs are lighter, have no moving mechanical parts inside (except contacts) and often look like a compact block with a ceramic element. In refrigerators Atlant old-style induction models are more common, but there are also modern options.
Do you need to defrost the refrigerator before replacing the relay?
Full defrosting is not necessary if you are only replacing the relay in engine compartment. However, if the refrigerator was working before the breakdown and there is a lot of ice in the chamber, it is better to let it thaw so that when moving and tilting to access the back wall, water does not flow onto electrical components or the floor.