A sudden stop of the compressor or the absence of the characteristic hum of a running motor in the refrigerator Indesit often indicates a failure of the start relay. This small but critical element is responsible for starting the engine and protecting it from overloads. If you are faced with the fact that the refrigerator has stopped freezing and the light inside is on, do not rush to call a technician or write off the equipment.
Independently replacing the relay is a procedure that is accessible even to a beginner with a minimum set of tools and a clear understanding of the connection diagram. In this article we will look at how to diagnose a breakdown, choose the right spare part and connect safely a new device. A competent approach will allow you to restore the functionality of your equipment without extra costs.
However, it is worth considering that working with electrical components requires precautions. Any installation error can lead to a short circuit or repeated failure of the compressor. Therefore, carefully study the theoretical part before you begin practical steps to repair your unit.
Diagnostics of a faulty start relay
The first step in restoring the functionality of the refrigerator is to accurately identify the problem. Often the symptoms of a relay malfunction are confused with a breakdown of the compressor or thermostat itself. The main sign of failure of the starting mechanism is a characteristic click, after which the engine tries to start, but immediately stalls. This cycle can be repeated at certain intervals.
Visual inspection can also provide a lot of information. If the relay body shows signs of burning, plastic melting or contact deformation, it must be replaced. In some cases, you can hear rattling inside the case, which indicates destruction of the internal coil or mechanical elements. Checking with a multimeter is the most reliable way to confirm the diagnosis.
⚠️ Attention: Before starting any diagnostic work, be sure to disconnect the refrigerator from the power supply! Working with live electrical wiring is deadly.
To carry out the tests, you will need a multimeter set to measure resistance. First, the integrity of the coil windings is checked, and then the condition of the contacts. If the device shows infinite resistance where there should be a circuit, or vice versa - a short circuit, the part is considered faulty. It is also important to check whether the anchor is stuck inside the mechanism.
Selecting a suitable relay for the Indesit model
The spare parts market offers many relay options, but for refrigerators Indesit it is important to choose a device with exactly the same electrical characteristics. The main parameters are the coil voltage, the type of contacts (normally open or closed) and the mounting method. Using an unsuitable analogue can lead to rapid combustion of the new element or damage to the compressor windings.
The most common relays found in equipment of this brand are the CSR or PTCseries. The former are electromagnetic and have a more complex design with moving contacts, the latter operate on the basis of thermal expansion and are considered more modern and reliable. When purchasing, pay attention to the markings on the body of the old part.
Below is a table of compatibility of popular relay series with refrigerator models, which will help you navigate the choice:
| Relay type | Indesit series | Power compressor | Features |
|---|---|---|---|
| PTC relay | C, D, DF | up to 1/3 hp | Silent operation, no moving parts |
| Electromagnetic | Old models | 1/4 - 1/2 hp | Requires precise orientation during installation |
| Combined | Indesit NBA | Universal | Combined with thermal protector |
| With a starting capacitor | Powerful models | more than 1/2 hp | Ensures soft engine start |
If you are not sure of the choice, it is better to remove the old relay and come with it to the store or take a photo of the markings to search in online catalogs. Universal relays exist, but they require careful configuration or checking the connection diagram, since the contacts may be located differently.
Can a universal relay be used?
Universal relays often have additional contacts or require re-soldering of wires. Their use is permissible as a last resort, but the original spare part will ensure better compatibility and durability of the compressor.
Preparation of tools and workplace
High-quality repairs are impossible without proper organization of the workspace. Not only will you need easy access to the back of the refrigerator, but also good lighting. Prepare all the necessary tools in advance so that you are not distracted by searching for them while working. This will speed up the process and reduce the risk of losing small parts.
A basic DIY kit for replacing a relay includes:
- 🔧 Screwdrivers (flat and Phillips) for removing the back panel and clamps.
- 🔌 Pliers or pliers for working with clamps wires.
- 🧹 A brush and alcohol to clean the compressor contacts from oxides.
- 📸 A smartphone for photographing the connection diagram before disassembling.
Pay special attention to cleanliness in the work area. Dust and moisture trapped inside the electrical contacts can cause a new breakdown. It is recommended to place a soft cloth or cardboard on the floor to avoid damaging the flooring or losing small screws that could roll out.
If your refrigerator is built-in, make sure you have sufficient access to the rear of the unit. It may be necessary to temporarily move furniture or remove decorative panels. Safety and ease of use are priorities at this stage.
Step-by-step instructions for dismantling the old relay
The process of removing the faulty element begins with gaining access to the compressor. It is usually located at the bottom rear of the refrigerator and is covered with a metal or plastic lid. Unscrew the mounting screws and carefully remove the protection. You will see a view of the motor and the components attached to it.
Next follow the algorithm of actions:
☑️ Relay removal algorithm
Removing the relay from the compressor contacts requires caution. It may be a tight fit, so don't yank it too hard. It is best to rock it slightly from side to side, gradually pulling it down. If the relay is held on a metal bracket, it must first be bent or unscrewed. In some models Indesit the relay is fixed with plastic latches that need to be carefully released.
After removing the part, inspect the contact group on the compressor. If you notice black deposits or oxidation, clean the contacts with fine sandpaper or a rag soaked in alcohol. Clean contacts provide reliable electric current and extend the service life of the new relay.
Connection diagram and installation of a new element
Installation of a new starting relay is carried out in the reverse order of dismantling. It is critical to correctly orient the part relative to the compressor. The body usually has a marking UP or an arrow indicating the top position. Incorrect orientation may result in the mechanism not working or operating intermittently.
When connecting wires, be guided by previously taken photographs or color markings:
- 🔴 The red or brown wire usually goes to the phase.
- 🔵 The blue wire is zero.
- 🟢 The yellow-green wire is grounding (connected to the housing).
Insert the relay onto the compressor contacts until it stops, making sure that it is seated tightly and without distortions. Then attach the retaining bracket or spring. After this, connect the block with the power wires. Make sure that the wires do not touch hot parts of the compressor and are not pinched.
⚠️ Attention: If you are using a universal relay, the connection diagram may differ from the factory one. Carefully study the instructions for a specific analogue, since the location of contacts L, S and C may be different.
After assembling all the elements, do not rush to close the back cover. Do a test run first. Plug in the refrigerator and listen. The compressor should start with a characteristic hum, and after a while (depending on the model) the fan should turn on and coldness should appear in the chambers.
Common mistakes when replacing yourself
Even following the instructions, inexperienced craftsmen often make mistakes that nullify all efforts. One of the most common problems is poor contact in the connecting block. If the wires are not inserted completely or are oxidized, sparking, heating and repeated failure will occur. Always check the tightness of the connection.
Another common mistake is ignoring the thermal regime. The relay must be able to cool down. If you install the part so that it is pressed tightly against the hot compressor housing without clearance, or forget to install the protective casing, its service life will be significantly reduced. Heat sink plays an important role in the operation of electromechanical components.
Also, users often forget to check the condition of the compressor. If the motor is “jammed” or has an interturn short circuit, installing a new relay will not help - it will burn out almost instantly. Therefore, diagnostics must be comprehensive.
You should not use relays from other refrigerator models without checking the characteristics. Visually, they may be similar, but differ in operating currents or type of contacts. This can lead to the fact that the relay will not open the starting winding, which will cause overheating and failure of the engine.
What to do if the new relay burns out immediately?
This indicates a more serious problem, most likely the compressor itself is faulty (turn-to-turn short circuit) or there are problems with the wiring. Professional motor diagnostics are required.
Checking operation after replacement
The final stage is testing the repaired refrigerator. After connecting to the network, let the equipment run idle for about 30-40 minutes. Do not load food at this time to avoid creating unnecessary heat load. Monitor the temperature of the compressor housing - it should warm up, but not be red-hot.
Pay attention to the following parameters:
- ✅ The compressor operates without extraneous knocks and vibrations.
- ✅ Shutdown occurs normally when the set temperature is reached.
- ✅ Frost or ice has started to form in the freezer.
If your refrigerator makes a loud clicking noise every few seconds and won't start, turn it off immediately. This is a signal that the protection is triggered due to a fault in the circuit. Perhaps the relay is again selected incorrectly or the problem lies deeper.
If the start-up is successful and the temperature reaches, you can safely install the back cover and return the refrigerator to its place. Do not forget to leave a gap for ventilation between the rear wall of the unit and the wall of the room.
How often do you need to change the relay in an Indesit refrigerator?
The relay is a resource part, but under normal operating conditions it lasts as long as the compressor itself (10-15 years). Frequent replacements (every 1-2 years) indicate power surges in the network or problems with the motor itself.
Is it possible to repair an old relay rather than changing it?
Theoretically, you can clean the contacts or replace a burnt out coil, but the reliability of such repairs will be low. Considering the low cost of a new part, repairing an old relay is not economically feasible and risky.
Why does the relay heat up during operation?
Slight heating is acceptable, since current passes through the coil. However, if the relay becomes hot to the point where you cannot touch it with your hand, this is a sign of overload, incorrect selection or poor contact in the circuit.
Does replacing the relay affect the warranty?
If the warranty period is still valid, opening the seals yourself and replacing parts will void the warranty. In this case, it is better to contact an authorized service center.
What tools will you definitely need?
Minimum set: flat and Phillips screwdrivers, pliers, multimeter (for diagnostics), alcohol and rags. A specialized tool is usually not required.