A sudden stop of the compressor or its characteristic knocking when trying to start often indicates a failure of the start relay. This small but critical element is responsible for supplying voltage to the motor windings at the moment of start. If you notice that your Indesit stops freezing, and the motor hums for only a few seconds and then stops, there is a high probability that the problem lies in this particular unit. Replacing a part yourself is possible if you act carefully and follow safety precautions.
Before starting disassembly, you need to make sure that the refrigerator is completely disconnected from the power supply. Start relay is an electromechanical device, and any manipulation with it under voltage is strictly prohibited. Owners often confuse the symptoms of a faulty relay with a breakdown of the compressor or thermostat itself, so correct diagnosis at the initial stage will save time and money. In this article we will analyze all the nuances of the replacement process.
The success of the operation depends not only on the availability of a new spare part, but also on a correct understanding of the unit’s structure. Modern models Indesit can be equipped with different types of starters, so it is important to choose an identical analogue. You should not ignore a visual inspection, since sometimes the reason lies in the oxidation of the contacts, and not in the mechanical destruction of the mechanism. Let's look at how to correctly identify the malfunction and eliminate it.
Diagnostics of a faulty starting device
The first sign that starting relay has failed is the failure of the compressor to start when the thermostat is running. You may hear a click followed by a motor hum for 3-5 seconds, followed by another click and silence. This means that the thermal release has tripped due to overcurrent because the motor was unable to start. In normal condition, the relay should switch the windings and provide a smooth start.
For accurate diagnostics, it is necessary to remove the relay from the compressor and conduct an external inspection. Shake the device near your ear: if you hear ringing or knocking inside, it means the mechanical part is damaged. The internal mechanism, be it a coil or a posistor, should not dangle freely. Also carefully inspect the internal cavity for traces of burning or melting of the plastic, which will indicate a short circuit.
⚠️ Attention: If traces of heavy soot or oxidation are visible on the relay contacts, cleaning can only give a temporary effect. It is better to immediately replace the element with a new one to avoid repeated breakdown of the compressor due to unstable starting.
Checking with a multimeter is the most reliable way to confirm the diagnosis. It is necessary to “ring” the contacts for breaks or short circuits. The resistance of a working coil or posistor must be within certain limits specified in the technical documentation. If the device shows infinity or zero where it should not be, the part must be replaced.
Selection of compatible spare parts for Indesit
Choosing the right one start relay is a key stage of repair. Refrigerators Indesit are equipped with various types of compressors (Aspera, Danfoss, Embraco), and each requires a specific starter. An error in choosing a model will result in the motor either not starting or burning out due to incorrect phasing or starting current. Therefore, before purchasing, be sure to remove the old part and check the markings.
A model code or compatibility list is usually printed on the device body. Pay attention to the number of contacts and their location. There are single-phase and two-phase relays, as well as devices with additional overheating protection. Purchasing a universal relay is possible, but requires careful customization for a specific engine, which is not always convenient at home.
Markings and types of relays
There are relays with a posistor (PTC) and induction. In Indesit refrigerators, posistor models are most often found, which are characterized by silent operation and the absence of moving parts. Induction relays have a movable core and produce a characteristic click each time they start.
When purchasing, pay attention to the manufacturer of the spare part. Original components Indesit or proven brands like Carel or Danfoss will last longer than cheap analogues. Cheap Chinese copies often have a low-quality plastic case that can melt at the first power surge. Saving on this part can lead to costly repairs of the compressor.
Tools and preparation for work
To replace the starting relay no complex professional tool is required, a minimum kit for a home craftsman is sufficient. You will need a flathead and Phillips screwdriver to remove the guards. You may also need pliers or pliers to carefully remove the clamps if they are present on the compressor mount.
Be sure to have a multimeter ready to check the circuit after installing the new part. This will ensure that there is no short circuit before turning on the refrigerator. It would be a good idea to have isopropyl alcohol and a rag on hand to clean the compressor contacts from possible oxidation or dust.
☑️ Preparation for repair
It is better to carry out work in good lighting, since the space behind the compressor is often shaded. Make sure the floor is dry and you are in a comfortable position. If the refrigerator is built-in, it may need to be pulled out of the niche to provide easy access to the rear panel. Do not forget to remove the lower decorative base if it blocks access to the engine compartment.
Removing the old start relay
The removal process begins with dismantling the compressor protective cover. It is usually secured with latches or several screws. Remove the cover carefully so as not to damage the tubes and wires. You will see a view of the compressor, to which a plastic block is attached on one side - this is the starting device assembled with a thermal release.
The relay is placed directly on the terminals of the compressor. To remove it, you need to gently rock the block from side to side, while simultaneously pulling it towards you. The start relay fits tightly, but should not require excessive effort. If it cannot be removed, check whether there is an additional fixing clamp or clip that holds the structure.
| Relay type | Mode of fastening | Removal features | Risk of damage |
|---|---|---|---|
| Posistor (PTC) | Tight fit on bayonets | Swinging left and right | Medium (can break plastic) |
| Induction | On bayonets + clamp | Removing the clamp + removal | High (fragile contacts) |
| Universal | Clamp connection | Unscrewing the screws | Low |
| With thermal protection | Assembled with relay | Removable as a single unit | Medium |
After removing the unit, disconnect the wires, going from the relay to the compressor and capacitor. Before doing this, it is recommended to photograph the connection diagram so as not to confuse the contacts during assembly. The wires can be clamped or soldered. In the case of terminals, simply pull them out, and if the wires are soldered, you will need a soldering iron, although in modern models Indesit a terminal connection is more often used.
Installation of a new component and assembly
Installation of a new start relay is carried out in reverse order. First, connect the wires to the appropriate terminals, following the color codes or photographs taken earlier. Make sure the connection is tight and secure. If you are using a universal relay, check the instructions on its housing for proper connection to the compressor terminals.
Place the relay block onto the compressor bayonets. It should go in all the way with a characteristic click or a tight fit. It is important that the relay sits strictly vertically, as installed by the manufacturer. An incorrect position may disrupt the operation of the internal mechanism or posistor, which will lead to rapid failure of the new part.
After installation, check that all elements are securely fastened. Wires should not touch hot parts of the compressor or sharp metal edges. Replace the engine compartment cover and secure it with screws or latches. Make sure that the condenser (if it is taken out separately) is also securely fastened and does not dangle.
⚠️ Attention: Never turn on the refrigerator if the compressor protective cover is removed. This may result in electric shock or foreign objects getting into moving parts.
Checking the system functionality
The final stage is a test run. Plug in the refrigerator and pay attention to the startup sound. The compressor should start working almost immediately after the relay clicks, without prolonged humming or vibration. If you hear a crackling noise or the motor hums but does not start, immediately unplug the device and recheck the connection diagram.
During the first 15-20 minutes of operation, monitor the temperature of the compressor housing. It should heat up evenly, but not to the point where it is impossible to touch it. Start relay during operation it may also heat up slightly, this is normal for the current passing through it. However, the smell of burning or smoke is unacceptable.
If the refrigerator began to gain temperature and cold appeared in the chambers, the repair can be considered complete. During the day, it is recommended to periodically check the operation of the unit to ensure that there are no cyclic shutdowns or other anomalies. Stable operation of the motor indicates that the load on the network and the motor itself corresponds to the norm.
Common mistakes when replacing a relay
One of the most common mistakes is ignoring the reason for the failure of the old relay. If the compressor is “heavy” (has mechanical damage or jamming), the new start relay will burn out in a few days or even minutes. Therefore, if after replacement the situation repeats itself, the problem may be deeper than just a burnt-out starter. start relay will burn out in a few days or even minutes. Therefore, if after replacement the situation repeats, the problem may be deeper than just a burnt out starter.
Also, technicians often forget to check the condition of the capacitor. If it has lost capacity, the starting torque will be insufficient and the relay will operate in emergency mode. Always change the capacitor together with the relay if there are doubts about its serviceability, since it is inexpensive and plays an important role.
Why does a new relay burn out?
A common reason is a voltage imbalance in the network or aging of the compressor. If the relay burns out repeatedly, it may be necessary to install a voltage stabilizer or replace the compressor itself with a more powerful analogue.
Incorrect orientation of the relay in space is another mistake. Some models are sensitive to position relative to the horizon. If the relay is turned upside down, gravity may prevent the moving parts from operating or dissipating heat from the PTC resistor. Always focus on the position of the old part or the “UP” marking on the case.
Is it possible to install a relay from another refrigerator model?
Technically possible if the electrical characteristics (starting current, voltage) and geometric dimensions of the seat match. However, using non-native components may result in unstable operation. It is better to look for an original or a complete analogue by catalog number.
How long does a starting relay last on average?
The service life of a high-quality relay is 5-10 years or more. However, frequent power surges in the network or severe operating conditions (high room temperature) can reduce this period to 2-3 years.
Is it dangerous to change the relay yourself?
The process of replacing the mechanical part is safe when the power is turned off. The main risk is due to incorrect assembly of the electrical part, which may result in a short circuit. If you are not confident in your abilities, it is better to call a specialist.
What to do if the compressor hums but does not start after replacement?
Most likely, the wires are connected incorrectly or a relay with inappropriate characteristics has been selected. A compressor wedge is also possible. It is necessary to turn off the power again and recheck the connection diagram according to the marking.
Do you need to solder the wires when replacing?
Most modern refrigerators Indesit use detachable terminals, and soldering is not required. However, in older models or when using universal relays, it may be necessary to connect the wires by twisting and soldering or using crimp terminals.