A sudden stop of the compressor or a characteristic click followed by silence are often the first signals of a malfunction of the trigger mechanism in refrigeration equipment. Equipment owners Indesit often encounter a situation where the engine hums but cannot start, or the unit stops cooling altogether. It is at this moment that there is an urgent need to figure out how to connect the Indesit refrigerator relay in order to return the device to functionality without calling an expensive repairman.
The starting relay is a compact but critical element of the electrical circuit, responsible for starting the engine and protecting the windings from overloads. Incorrect connection or ignoring installation nuances can lead to failure of an expensive compressor, so the replacement procedure must be approached with the utmost care and understanding of the physical processes. In this article, we will analyze in detail the algorithm of actions, connection diagrams and typical mistakes that inexperienced users make when repairing household appliances on their own.
Diagnostics of a malfunction of the starting device
Before proceeding with physical intervention in the electrical circuit, you need to make sure that the problem lies precisely in the relay, and not in other components of the refrigerator. Often the symptoms of a faulty starter are confused with a breakdown of the compressor or thermostat itself, which leads to unnecessary costs for replacing working parts. The main sign of failure start relay is a characteristic click that is heard a few seconds after the device is plugged in, followed by the damping of the motor hum.
Visual inspection can also provide important information about the condition of the component: if traces of burning, melting of plastic or contacts become blackened, replacement is required immediately. Sometimes the relay looks intact, but inside the bimetallic plate has already broken or the coil has collapsed, which requires a more in-depth check using a multimeter. You should not ignore even the slightest signs of unstable operation, since a faulty starter can create an increased load on the motor windings.
⚠️ Attention: If after clicking the relay the compressor continues to hum, but does not start within 5-7 seconds, immediately disconnect the refrigerator from the network. Long-term operation in this mode will lead to overheating and motor wedge.
For accurate diagnostics, it is recommended to ring the contacts of the device in the off state, checking the resistance between the terminals. The normal resistance value for a working coil is usually several tens of ohms, while a break will show infinity, and a short circuit will show zero. If you are not confident in your skills in working with electrical measuring instruments, it is better to entrust this stage to a specialist to avoid erroneous conclusions.
Preparation of tools and safety measures
High-quality repairs are impossible without proper preparation of the workplace and the availability of the necessary tools. To replace the relay in the refrigerator Indesit you will need a minimum set of plumbing supplies that any home craftsman can find in his home. The main rule is to ensure complete safety of work, since you will be dealing with electric current and complex mechanical components.
First of all, you need to completely de-energize the unit by unplugging the plug from the socket, and only after that proceed to dismantling the protective covers. Ignoring this rule may result in electric shock as some parts of the circuit may be energized even when the thermostat is off. In addition, working with electrical appliances requires a dry floor surface and no moisture on the hands of the master.
To complete the task you will need the following tools:
- 🛠️ A set of flat-head and Phillips screwdrivers for removing the back panel and clamps.
- 🔧 Pliers or pliers for carefully removing terminals and fixing wires.
- 🧤 Dielectric gloves to protect against accidental electric shock when checking contacts.
- 📸 Smartphone or camera for photographing the connection diagram before disassembling.
☑️ Preparation for repair
Removing the old relay and cleaning the contacts
The process of removing the faulty element begins with access to the compressor, which in models Indesit is usually located in the lower rear part of the case. After removing the metal cover, you will see a black cylindrical or cubic motor-compressor, to the bottom of which a small plastic box is attached - this is the relay you are looking for. Carefully remove the retaining bracket or clamp holding the part in place, being careful not to damage the associated wires.
When removing a relay, it is strongly recommended that you take several high-quality photographs of the current connection before disconnecting the wires, as the color markings of the wires may fade over time or not correspond to the standard pattern. If the wires have terminal connections, they should be removed carefully, holding the base so as not to pull the contact out of the socket.
After removing the part, inspect the seat on the compressor: there should be no traces of oxidation, carbon deposits or moisture. If the contacts on the motor terminals are covered with oxide, they must be carefully cleaned with fine sandpaper or a special contact spray. The cleanliness of the connection directly affects the quality of current transmission and the absence of sparking during operation.
Why do contacts oxidize?
Oxidation of contacts most often occurs due to microscopic sparks when the circuit is opened or moisture ingress during defrosting. The oxide film increases the resistance, which leads to heating and eventual burning of the contacts. Regular cleaning and use of contact sprays prolong the life of the assembly.
Connection diagram and contact marking
The most critical step is the correct connection of the new relay to the compressor terminals, since an error in the sequence can fatally affect the operation of the engine. Refrigerators Indesit most often use relays of the R6, RCT or PTCseries, which have specific terminal markings. On the body of the part there are usually markings S (Start - starting winding), R (Run - working winding) and C (Common - common wire), which must strictly correspond to the contacts on the compressor.
If the marking on the new relay does not match the old part or worn out, you need to focus on the color marking of the wires and the location of the contacts relative to each other. In most cases, the common wire (C) has the largest cross-section or is highlighted in color, and the starting and working wires are located at a certain angle. An incorrect connection will result in the motor either not starting or running on only one winding, quickly overheating.
Below is a table of pin correspondence for typical connection diagrams:
| Designation on the relay | Output function | Wire color (typical) | Location on compressor |
|---|---|---|---|
C or 1 |
Common contact | Black or Red | Top or center |
R or 2 |
Working winding | White or Blue | Bottom right |
S or 3 |
Starting winding | Green or Yellow | Left lower |
PE |
Grounding | Yellow-green | On the motor housing |
When installing a new part, make sure that it sits tightly on the terminals and does not wobble during vibration. Reliable fixation is ensured either by the latches of the relay body itself, or by an additional metal clamp, which must be returned to its place. If the connection is not tight, heat will begin to be generated at the contact point, which will lead to repeated failure.
Installation and testing of the compressor
After all the wires are connected according to the diagram, it is necessary to securely fix the relay in its original position and assemble the protective casing. Make sure that no wires are pinched or touching hot parts of the compressor or moving parts. Before the final assembly of the rear panel, it is recommended to conduct an initial test run to ensure that the work performed is correct.
Plug in the refrigerator and listen carefully to the sounds made by the motor. A working unit should start smoothly, without strong jerking or buzzing, and after a few seconds the relay should click quietly, cutting off the starting winding. If the engine starts running smoothly and begins to pick up speed, we can assume that the connection is made correctly and the system is ready for operation.
Pay attention to the following signs of a successful replacement:
- ✅ The compressor starts on the first try without long delays.
- ✅ There is no characteristic crackling or buzzing sound, lasted until the breakdown.
- ✅ After 10-15 minutes of operation, cooling is felt in the freezer.
- ✅ The relay body does not heat up to temperatures that cause discomfort when touched.
⚠️ Attention: If the refrigerator is working after replacing the relay, but after 10-15 minutes it turns off again with a click, perhaps the problem is not in the relay, but in the compressor itself (interturn short circuit) or in the thermostat.
Typical mistakes and expert advice
When repairing refrigerators on their own Indesit masters often make a number of typical mistakes, which ruin all your efforts. One of the most common problems is the use of the wrong relay analogue, since different compressor models require specific starting current and delay time characteristics. Installing a universal relay without checking the parameters can lead to rapid failure of both the new part and the engine itself.
Another common mistake is ignoring the condition of the wires: if the wiring insulation is cracked or melted, it must be restored or the entire section replaced. The use of twists instead of soldering or high-quality terminals is unacceptable in places with high vibration, as the contact will weaken over time and begin to spark. It is also important not to forget about grounding if the design of the refrigerator provides for its presence.
In conclusion, it is worth noting that replacing the start relay is a completely feasible task for a person with basic technical skills, but it requires care and adherence to the sequence of actions. A correctly selected component and a high-quality connection guarantee long and stable operation of your refrigerator. If after all the manipulations the problem is not solved, it is advisable to contact a service center for in-depth diagnostics of the electrical circuit.
Is it possible to install a relay from another refrigerator model?
The use of relays from another model is possible only if their electrical characteristics (operation current, coil voltage) and geometric dimensions completely coincide. Universal relays often require additional configuration or selection of adapters, which does not always guarantee stable operation.
Why does a new relay burn out after a few days?
Frequent combustion of new relays indicates a more serious problem, for example, an interturn short circuit in the compressor windings or a malfunction of the thermostat that does not turn off the motor on time. Also, the reason may be low voltage in the network or the use of a low-quality analogue part.
How can you tell that the compressor is faulty and not the relay?
If you hear a loud beep when you turn it on, knock out plugs or a circuit breaker, and a new working relay burns out instantly - most likely, the compressor itself is faulty. Also, a sign of motor breakdown is the lack of starting even when voltage is directly applied to the windings.