Modern refrigerator is a complex unit, but its operation is based on several key components, without which cooling is impossible. One of these most important elements in the brand’s technology Indesit is the starting relay, which is responsible for the start and normal functioning of the compressor. It is this small unit that supplies the electrical impulse necessary to activate the motor-compressor, which, in turn, circulates the refrigerant through the system.
When you hear a characteristic click when you turn on the refrigerator or, conversely, notice its silence, the problem often lies precisely in the electrical circuit for starting the engine. Understanding how the Indesit refrigerator relay workswill allow you to diagnose the breakdown yourself and avoid an expensive call to a technician to simply replace the part. In this article, we will analyze in detail the structure of the mechanism, its role in the overall scheme and the algorithm of actions when faults are detected.
Equipment owners often underestimate the importance of this component, considering it secondary, however, without a working starting device, the entire unit turns into a useless cabinet. Next, we will look at the physical principles of operation of electromagnetic and thermal mechanisms that are used in various models Indesit, and learn to distinguish them visually. This knowledge will become the foundation for successful repairs.
Functional purpose of the starting relay in the refrigerator
The main task of this element is to briefly supply voltage to the starting winding of the compressor motor. When the refrigerator is turned on, the motor rotor is in a stationary state, and to spin it up, a significant force is required, which is precisely what starting windingprovides. The relay automatically connects this winding to the network, and after the engine reaches the required speed, turns it off, leaving only the working winding to work.
In addition to the starting function, many relay models installed in refrigerators Indesitplay the role of a thermal protector. Inside the case there is a bimetallic element that reacts to increased temperature. If the compressor begins to overheat due to overload or ventilation problems, the relay opens the circuit, preventing the expensive motor from burning out. This dual purpose makes the component critical to the safety of the entire system.
It is important to understand that the switching process occurs in a fraction of a second and depends on the current drawn by the motor. Until the rotor spins, the current is high, which keeps the contacts closed. As soon as the speed reaches the norm, the current drops, and a spring or gravity (depending on the design) opens the contacts of the starting circuit. Violation of this balance leads to the fact that the refrigerator stops freezing or begins to work intermittently.
⚠️ Attention: An attempt to turn on the refrigerator with a faulty or removed relay can lead to instantaneous burnout of the compressor windings. Do not experiment with power without an installed protective starting device.
Modern control systems can also use electronic analogues, but in classic models Indesit mechanics predominate. The reliability of mechanical parts is high, but they are subject to contact wear and aging of materials. That is why diagnostics begin with checking the integrity and functionality of this unit.
Design and principle of operation of the trigger mechanism
To effectively troubleshoot a malfunction, it is necessary to clearly understand the internal structure of the device. Most refrigerators Indesit use electromagnetic relays, the operation of which is based on the interaction of a magnetic field and a moving core. Inside the plastic case there is a coil through which the current of the main winding of the motor passes, creating a magnetic field.
When power is applied, the current passes through the coil, creating a force that retracts the movable core. This core is mechanically connected to a contact group that closes the starting winding circuit. The motor starts, its speed increases, and the current consumption decreases. When the current drops below a certain threshold, the strength of the magnetic field is no longer sufficient to hold the core, and under the influence of its own weight or spring it returns to its original position, opening the contacts.
Thermal protection is also often built into the design. It is a bimetallic plate that bends when heated. Bimetallic element opens the power contacts of the entire compressor if the temperature of the motor housing exceeds permissible standards. After cooling, the plate returns to its original state, and the cycle can be repeated if the cause of overheating is not eliminated.
Difference between an electromagnetic relay and a posistor relay
In electromagnetic relays, switching occurs due to a change in the current strength in the coil and the gravity of the core. PTC posistors (often found in newer models) use a special ceramic element that sharply increases its resistance when heated by current, essentially turning off the starting winding without mechanically opening the contacts. PTC resistors are quieter, but sensitive to voltage surges.
Some modifications may have additional contacts to control a fan or alarm, but the basic principle remains the same. Understanding the physics of the process helps to quickly determine which element has failed: the coil, contacts or thermal release.
Main symptoms of a compressor relay malfunction
Fault diagnosis often begins with an analysis of the sound signals that the unit produces. If you notice that the refrigerator Indesit hums but does not turn on, or you hear frequent clicks every 10-20 seconds, this is a direct symptom of a problem with the starter. The compressor tries to start, the relay clicks, trying to give an impulse, but the protection turns off the power again.
Another clear sign is the complete absence of the compressor working while the light inside the chamber is on. In this case, the relay may be completely broken or its contacts may be so oxidized that no current can flow. It is also worth paying attention to the appearance of the part: if the plastic has turned black, melted or there is a burning smell, then thermal protection or the contacts have clearly been overloaded.
Sometimes the refrigerator works, but does not reach the desired temperature, working without stopping. This may indicate that the starting winding is not turned off after starting, which leads to overheating of the engine and its operation in an inefficient mode. In such a situation, the relay is stuck in the closed state.
Visual inspection often provides more information than it seems. Remove the back cover and inspect the compressor area. The presence of traces of soot or deformation of the relay housing is a 100% indicator of the need for replacement. Ignoring these symptoms can lead to failure of the compressor itself, the repair of which is not economically feasible.
Diagnostics: how to check the relay for functionality
Before going to the store for a new part, you need to make sure that the problem is in the relay, and not in the compressor itself or the wiring. To carry out diagnostics, you will need a multimeter. The first step should always be to completely unplug the refrigerator. Safety is the number one priority when working with electrical appliances.
Remove the relay from the compressor tail. It is usually secured with a bracket or latches. Carefully disconnect the wires, first remembering or photographing their location. Now you can start dialing your contacts. Switch the multimeter to resistance measurement mode (Ohm).
Check the continuity between the contacts corresponding to the power input and the coil. If the device shows infinity (break), it means the coil has burned out. If the resistance is close to zero, a short circuit is possible. Also check the thermal protection: in a cold state it should “ring” (show zero), and when heated (you can gently warm it up with a hair dryer) it should open.
☑️ Test algorithm with a multimeter
Pay special attention to the contact group. If carbon deposits are visually visible, this does not mean that the relay is faulty, but it is not recommended to clean the contacts inside the sealed housing. It is better to replace the entire assembly, since violation of the geometry of the contacts will lead to repeated failure.
Table for diagnosing relay faults
To systematize the data obtained during diagnostics, it is convenient to use a summary table. It will help you quickly compare the symptoms and the results of measurements with a multimeter in order to make the right decision on repair or replacement.
| Symptom | Multimeter readings | Probable cause | Action |
|---|---|---|---|
| Clicks, compressor hums | Open coil circuit | Electromagnet winding burnt out | Replacing the relay |
| The refrigerator is silent | Infinite resistance at the input | Open circuit of thermal protection | Replacement of relay or protection |
| Compressor does not start | Resistance is normal | Sticking contacts or mechanical wear | Replacing the relay |
| Frequent switching on/off | Resistance changes chaotically | Unstable operation of the bimetallic plate | Relay replacement |
This table covers the most common failure scenarios. However, it is worth remembering that sometimes the problem may lie in the compressor itself (an interturn short circuit), which simply “drops” the voltage, preventing the relay from working normally. Therefore, a comprehensive check is required.
Step-by-step instructions for replacing the Indesit refrigerator relay
If the diagnostics confirm a malfunction, the next step is replacement. Fortunately, in refrigerators Indesit this process is relatively simple and does not require specialized tools other than a screwdriver and pliers. The main thing is to select an exact copy of the removed device, since the mounting locations and current characteristics may differ.
Start by purchasing a new relay. Pay attention to the marking: it should match your old part (for example, R600 or R134a series, depending on the type of refrigerant and compressor power). Do not try to install a relay from another manufacturer without checking compatibility - this risks burning the new compressor.
Remove the old relay by carefully disconnecting the wires. Install the new device onto the three pins of the compressor. It should fit tightly and without distortion. Connect the wires according to the photographs or color markings you took earlier. Usually the circuit is simple, but an error in the connection can lead to a short circuit.
After assembly, turn on the refrigerator. For the first few minutes, listen to the operation of the unit. Startup should be smooth, without loud clicks or buzzing. The compressor should pick up speed and run smoothly. If you hear any extraneous sounds, immediately turn off the device and recheck the installation.
Common mistakes during repairs and expert advice
When repairing themselves, refrigerator owners Indesit often make typical mistakes that nullify all efforts. One of the most common is ignoring the type of refrigerant. Relays for systems with freon R134a and R600a may have different designs and current characteristics. Installing an unsuitable relay will lead to improper operation of the engine.
Another mistake is an attempt to “reanimate” the old relay by stripping the contacts or knocking out the core. Even if after such manipulations the refrigerator starts working, this will be a temporary solution. The mechanism is already broken, and a second breakdown will happen in the near future, perhaps with more dire consequences for the compressor.
Also, do not forget about the cleanliness of the contacts. When replacing a relay, check the terminals on the wires. If they are oxidized or melted, they must be replaced or cleaned. Poor contact at the junction of the wire and the relay causes heating, which can again damage even a new part.
⚠️ Attention: Specifications of compressors and compatible relays may vary depending on the model year. Always check the markings on the refrigerator nameplate and on the relay itself before purchasing a spare part.
Following these simple rules will extend the life of your refrigerator. Remember that high-quality diagnostics and correct installation are the key to successful repairs. Take your time, act carefully, and your refrigerator will again delight you with stable operation.
In conclusion, it is worth noting that although replacing a relay is a procedure accessible to a home craftsman, it requires care and compliance with safety precautions. If you are not confident in your abilities or see complex damage to the wiring, it is better to turn to professionals. However, knowing how this unit works will help you correctly explain the problem to the technician and avoid imposing unnecessary services.
Is it possible to start an Indesit refrigerator without a relay?
Theoretically, you can start the compressor by applying voltage directly to the starting and operating windings, but this is absolutely impossible to do in a domestic environment. Without thermal protection, the compressor will burn out in a few minutes if overloaded, and without automatic shutdown of the starting winding, the engine will operate in emergency mode. This will lead to irreversible damage.
Why does the refrigerator relay click and turn off?
Frequent clicks (every 10-30 seconds) indicate that the thermal protection is triggered. The compressor tries to start, the current increases sharply, the relay clicks, trying to turn on the starting winding, but the engine does not start (due to jamming or a malfunction of the relay itself). The current increases, thermal protection turns off the power. After a while, it cools down and the cycle repeats.
Where can I find the relay markings for replacement?
The markings are usually applied to the side or top edge of the plastic relay case. Also, information about the type of relay required can be found in the technical documentation of the refrigerator or on the characteristics sticker located inside the chamber or on the back wall. Look for designations like RANCO, Danfoss or codes like 103N0019.
How much does it cost to replace a relay in an Indesit refrigerator?
The cost consists of the price of the spare part itself and the work of the technician. The relay itself is inexpensive, usually in the range from 500 to 1500 rubles, depending on the model and manufacturer. The work of a specialist can cost from 1000 to 2500 rubles. Self-replacement allows you to save on the cost of services.