Sudden stop of the compressor and lack of cold in the refrigerator chambers Atlant often indicate a failure of the start-up relay. This small but critical element is responsible for starting the engine and protecting it from overloads. If you hear clicks, but the engine does not start, or it hums for a few seconds and then goes silent, the problem most likely lies in this unit. Replacing a part is a procedure that is accessible even to a home craftsman if he has basic tools and strictly adheres to safety precautions.
Before starting disassembly, you need to make sure that the problem is really in the relay, and not in the compressor or wiring itself. Start relay often fails due to power surges or natural contact wear. In this article, we will analyze in detail the algorithm of actions that will help you independently diagnose and replace it, returning the equipment Atlant operability. Remember that any work with electrical appliances requires caution.
Modern models of refrigerators are equipped with different types of motors, and their connection diagrams may differ. However, the general principle of replacing a relay remains similar for most modifications. It is important to understand that incorrect installation or the use of the wrong part can cause the compressor windings to burn out. Therefore, carefully study the labeling of the old element before purchasing a new one.
⚠️ Attention: Before starting any work, be sure to disconnect the refrigerator from the power supply! Unplug the cord from the outlet to eliminate the risk of electric shock.
Diagnosing a malfunction of the start-up relay
The first step in the process of restoring the functionality of the refrigerator is an accurate diagnosis. Symptoms of a malfunction may be similar to a compressor failure, but the cost of replacing the relay is incomparably lower. If you observe characteristic signs, such as periodic clicks, the hum of the motor without starting, or a complete lack of response to turning on, you need to conduct a visual inspection and test the contacts.
To check, you will need a multimeter. Remove the back cover of the compressor and get to the relay. Carefully disconnect it from the motor contacts. Visually inspect the housing: the presence of melting, blackening or cracks clearly indicates the need for replacement. Even if there are no external defects, the internal circuit may have burned out.
- 🔍 Visual inspection: Look for traces of burning, soot or deformation of the plastic on the relay body.
- 🔊 Audio diagnostics: Shake the relay near your ear; if you hear ringing or knocking, it means the core or contacts are broken.
- ⚡ Check with a multimeter: Ring the contacts in different positions; the resistance must comply with technical standards.
Pay special attention to the model of your refrigerator. Technology Atlant is characterized by the use of relays of the RT, RTP series or more modern versions with a capacitor. If the relay is thermal, it can cool down for several minutes before trying to start again, which simulates the operation of a working device intermittently. However, if the cycle is repeated endlessly and the cold does not accumulate, the part is faulty.
Do not ignore the burning smell that may come from the compressor compartment. This is a sure sign that the electrical arc inside the relay has damaged the insulation or melted the contacts. In such cases, the replacement is made unconditionally. Also check the condition of the wires going to the relay: they should not be broken or oxidized.
Preparation of tools and selection of a new relay
The success of the replacement operation depends not only on your skills, but also on the correctness of the selected spare part. The market offers many analogues, but for refrigerators Atlant original components or certified substitutes with identical characteristics are best suited. Pay special attention to voltage, current and type of contacts.
To carry out the work you will need a minimum set of tools. This will avoid damage to the plastic elements of the housing and compressor terminals. Do not use brute force when removing old parts, as the metal may become brittle after long-term use.
☑️ What to prepare for work
When choosing a new relay, check the compatibility table. Often codes are stamped on the body of the old part, which can be used to find an analogue. For example, relays RTK-1 or RTP-1 are common options for many models. It is important that the rated current of the new part matches the current of the burned-out item.
| Relay type | Atlant refrigerator model | Rated current | Features |
|---|---|---|---|
| RTK-1 | MXM-162, 1700 series | 1.3 A | Thermal protection |
| RTP-1 | MXM-1730, 1800 series | 1.1 A | Posistor start |
| RT-1 | Old models | 1.8 A | Requires a capacitor |
| 17.509 | Modern No Frost | Universal | Combined |
If you can’t find an exact copy, installation of a universal relay with a suitable current range is allowed. However, in this case, you need to be sure that the contacts are connected correctly, since their location may differ from the original. Connection diagram in this case, it is studied by the markings on the product itself.
⚠️ Attention: Do not use a relay with a higher rated current “just in case.” This can lead to the fact that the protection will not work in case of overload, and the compressor will burn out.
Removing the old start relay
The process of removing the old relay requires care. Once you are sure there is no power, move the refrigerator away from the wall to gain access to the back. Remove the cardboard or metal cover covering the compressor compartment.
The relay is usually placed directly on the three contacts of the compressor and secured with a metal bracket or plastic clip. First you need to remove the fixing element. Be careful: the bracket may be rusty or tight, and sudden movement may damage the tubes or wires.
Gently pull the relay down, removing it from the contacts. If it gets stuck, you can slightly rock it from side to side, but without fanaticism. Disconnect the wires going to the relay. Remember or take a photo of which wire was connected where, although they are usually color-coded or labeled.
What to do if the relay is stuck?
If the relay cannot be removed by hand, do not use a hammer. Try gently heating the joint with a hairdryer or using WD-40 to loosen the oxides. Act slowly so as not to break the compressor contacts.
After removing the part, inspect the contacts on the compressor itself. They must be clean, free of soot and oxidation. If you notice black spots, carefully sand them off with fine sandpaper or a file. This will ensure reliable contact with the new relay.
Connection diagram and installation of the new part
Installation of the new relay is performed in the reverse order of dismantling. However, it is critical to connect the wires correctly here. The relay body usually has markings: L (Line) - phase, N (Neutral) - zero, R or S - starting winding, C or M — working winding. An error in connection may result in a short circuit.
Connect the wires to the appropriate terminals of the new relay. Make sure the connection is tight and secure. If the terminals are oxidized, it is better to replace or clean them. Then slide the relay onto the compressor pins. It should fit tightly, without play.
- 🔌 Phase and Zero: Check the polarity, if indicated, although this is not always critical for the starting circuit, it is important for the correct operation of the protection.
- 🛡️ Fixation: Be sure to install a metal bracket or plastic holder so that the relay does not vibrate during operation.
- 🧊 Orientation: The relay must stand strictly in the position in which it was originally (usually with the UP arrow up), otherwise the protection mechanism will not work correctly.
After installing the part, secure it with the fixing bar. Make sure that the wires do not touch hot parts of the compressor or moving parts. Assemble the protective cover of the compressor compartment, but do not screw it tightly yet, so that you can observe the process of the first start-up.
Now you can turn on the refrigerator. Notice the startup sound. The compressor should start working with a characteristic hum, and after a while (usually 10-15 minutes) the chambers should begin to get colder. If you hear clicks and the motor does not start, immediately turn off the device and recheck the circuit.
Features of the relay for different Atlant models
Refrigerators Atlant have been produced for several decades, and during this time the design of the starting equipment has changed. Older models used relays with thermal protection, where a bimetallic strip opened the circuit when heated. Modern versions often use posistor relays, which are more reliable and have no moving parts.
For models with the system No Frost the relay can be combined with a defrost timer or have additional contacts to control the fan. In such cases, a simple one-to-one replacement may not be suitable, and a more in-depth diagnosis of the electrical circuit is required. It is important to consider that electrical diagram may differ depending on the year of manufacture.
⚠️ Attention: The design and arrangement of elements may vary depending on the modification of the refrigerator. Always check the technical documentation of a specific model if the standard circuit does not work.
If you are the owner of a two-compressor refrigerator, remember that the relays in them may be different for the upper and lower circuits, although visually they are often identical. The difference may be in the operating current. Installing a relay from the upper compressor to the lower one (or vice versa) can lead to unstable operation.
In some modern models, the relay is integrated into a common control board, but in most household refrigerators Atlant it remains a separate hinged element. This simplifies repairs and reduces their cost. The main thing is not to mix up the wires when connecting to the connectors.
Checking operation and typical errors
After successfully starting the refrigerator, do not rush to load it with food. Let the equipment run idle for at least 2-3 hours. This will allow you to evaluate the stability of the compressor and make sure that the new relay does not heat up excessively. The temperature on the relay body should be warm, but not scalding.
A common mistake made by novice technicians is to ignore the condition of the capacitor, if it is provided for in the circuit. If your relay has a capacitor, it is also worth checking or replacing, as the old one may have dried out electrolyte and not provide sufficient starting torque.
- 🌡️ Temperature control: Touch the relay body after an hour of operation; strong heating indicates poor contact or incorrect selection.
- 🔇 Noise level: Loud humming or vibration may indicate that the relay is loose or incorrectly selected.
- ❄️ Cold dynamics: The freezer should begin to cool in the first 30-40 minutes of operation of a working compressor.
Another mistake is installing the relay “upside down”. Many models have a strict installation orientation, indicated by an arrow. If you turn the relay over, gravity will not help the contacts open or close at the right time, and the protection will not work if there is an overload.
If after replacing the relay the refrigerator started working, but after a while it stopped freezing again, the problem may be deeper. Perhaps the compressor itself is faulty (interturn short circuit) or there is a freon leak. In this case, simply replacing the relay will only give a temporary effect.
Is it possible to install a universal relay instead of the original one?
Yes, it is possible if the electrical characteristics (current, voltage) and type of protection match. However, universal relays may differ in size or contact arrangement, which will require modifications to the mounting or wiring. It is better to look for the original or a complete analogue by catalog number.
Why does a new relay burn out immediately after installation?
This can happen for several reasons: the compressor is jammed (the motor cannot turn), there is a short circuit in the wiring, or a relay with a rated current that is too low is selected. Also, the cause may be a malfunction of the capacitor.
How to understand that the relay is working without a multimeter?
It is difficult to accurately determine without instruments. You can gently shake the relay near your ear - if you hear a clear knocking or ringing, it is broken. If there is silence, this is a good sign, but not a guarantee. A visually melted body also indicates a malfunction. The most reliable way is to replace it with a known good one.
Is it necessary to change the capacitor along with the relay?
If the capacitor is built into the relay body, then the entire unit is changed. If it is separate and looks intact (not swollen, not leaking), it can be left. However, given the low cost, many craftsmen recommend changing the entire bunch for reliability.
How long does the starting relay last?
The service life of the relay depends on the quality of the electrical network and the frequency of the compressor switching on. On average, a part lasts 5-10 years. Frequent power surges significantly reduce this period. Using a voltage stabilizer will extend the life of not only the relay, but also the compressor.