Failure of the starting device - This is one of the most common reasons why refrigeration equipment Stinol stops cooling food. If you notice that the engine hums but does not start, or, conversely, turns on and immediately stalls, most likely the problem lies in this compact but critical element. Replacing the relay on a Stinol refrigerator yourself is a real task for a home craftsman, which allows you to save a significant amount on calling a specialist if you act carefully and consistently.
Before you start disassembling the unit, you need to make sure the diagnosis is accurate. An incorrect diagnosis can lead to the purchase of unnecessary parts or, worse, damage to a working compressor. In this article, we will analyze in detail the algorithm of actions that will help you safely dismantle the old element and install a new one trigger mechanism, giving the equipment a second life without extra costs.
To start work, you will need a minimum set of tools: pliers, a screwdriver and, preferably, a multimeter to check the contacts. It is important to understand that electrical safety comes first, so any manipulations with wires and internal components are carried out only after disconnecting the device from the network. Do not ignore this rule, since residual voltage or accidental contact with live parts can be dangerous.
Diagnosis of a faulty starting device
The first sign that starting relay has failed is the characteristic behavior of the compressor. The motor tries to start, makes a humming sound, clicks, but the shaft does not rotate fully. After a few seconds, the thermal protection is triggered and the unit quiets down to repeat the cycle again after a while. This mode of operation is extremely harmful to the motor windings and can lead to their burnout if the cause is not promptly eliminated.
Visual inspection often helps to identify obvious signs of breakdown. If you remove the protective casing and find that the plastic housing of the relay is melted, blackened or cracked, this is a sure sign of an internal short circuit. It is also worth paying attention to the condition of the contacts: oxidation or carbon deposits on the terminals can prevent the normal transmission of current, which simulates a breakdown of the element itself.
⚠️ Attention: If after replacing the relay the situation has not changed and the compressor hums but does not start, the problem may lie in the motor itself or an interturn short circuit. In this case, further operation is dangerous and requires professional diagnostics.
For more accurate diagnostics, you can use a multimeter. By ringing the contacts in different positions, you can determine whether the circuit opens where it is needed. However, given the low cost of the spare part, it is often easier and faster to simply replace the element with a known good one to eliminate the possibility of measurement error. This is especially true for older models, where the wear and tear of materials reaches critical values.
Preparation of tools and selection of spare parts
The success of the repair largely depends on the correctness of the selected spare part. Relays for refrigerators Stinol may differ in the type of connection, number of contacts and method of attachment. There are devices on the market with one or two capacitors, as well as those that differ in housing shape. An error in selection will lead to the fact that the new element simply will not fit into the place of the standard one or will not fit the electrical parameters.
In order not to make a mistake with the model, it is best to remove the old relay and look for an analogue by the markings on its body. Typically this is a set of numbers and letters that indicates the manufacturer and technical specifications. If the marking is not readable, you can use compatibility catalogs, focusing on the model of the refrigerator itself and the type of installed compressor.
In addition to the spare part itself, prepare a work area. You will need:
- 🔧 Screwdriver (Phillips and flat) for removing protective panels.
- 🔌 Pliers for careful removal of terminals.
- 🧹 Dry rags for cleaning contacts from dust.
- 📸 Smartphone for photographing the connection diagram before disassembling.
Pay special attention to the cleanliness of your hands and tools. Moisture or metal shavings must not enter the mechanism. Also make sure you have adequate lighting in the work area, as the back of the refrigerator is often in the shade.
Safety during work
A refrigerator is an electrical device operating on a 220-volt network. Any work inside the electrical part should only be carried out with the power completely disconnected. It is not enough to simply turn off the toggle switch if there is one; you need to unplug the cord from the outlet. This ensures that accidental switching on or a power surge will not harm you or the electronics of the device.
Another important aspect is time. After defrosting and unplugging, let the refrigerator sit for at least 15-20 minutes. This is necessary so that the refrigerant in the system is redistributed and the oil in the compressor flows into the crankcase. A sudden start after a long period of inactivity or manipulation can be harmful to the system's hydraulics.
Work in a dry room. If the floor in the repair area is wet or there is a risk of water getting on exposed wires, lay down a dry rubber mat or wooden board. Humidity significantly reduces skin resistance and increases the risk of electric shock, even at low voltages.
⚠️ Warning: Never touch metal parts of the compressor or condenser tubes while the engine is running if you decide to check for live starting. Surface temperatures can reach high values, and the risk of electric shock remains real.
Step-by-step instructions for removing the old relay
The removal process begins with access to the compressor. To do this, move the refrigerator away from the wall, allowing access to the rear panel. On some models Stinol it may be necessary to remove the lower decorative grille or back cover that is secured with screws. Use a suitable screwdriver to avoid tearing off the caps of the fasteners.
Locate the compressor - this is the black metal “tank” at the bottom of the unit. A plastic box fits on the side or top of it - this is our desired device. It can be closed with an additional metal bracket or a plastic casing. Carefully remove the clips, trying not to use excessive force, as the plastic becomes brittle over time.
Next comes the most crucial moment - disconnecting the wires. Before pulling the terminals, check again with the photo you took earlier. Disconnect the wires one at a time, labeling them or remembering the order. Typically, three main wires are suitable for the relay: phase, neutral and ground, as well as wires going to the compressor windings.
☑️ Removing the relay
After disconnecting the wires, you need to remove the relay itself from the compressor pins. It is held in place by a tight fit on the contacts and, possibly, an additional fixing strip. If there is a strip, bend it or unscrew the screw. Then, using light rocking movements from side to side (not up and down, so as not to damage the tubes!) remove the housing from the pins.
Installation and connection of a new element
Installation of a new one starter is carried out in the reverse order of dismantling. First of all, make sure that the compressor pins are clean and free of oxidation. If necessary, carefully clean them with fine sandpaper or an eraser, being careful not to damage the copper wire inside the tubes.
Push the new relay onto the contact pins until it stops. You should feel a characteristic click or a tight fit. Make sure the device sits level and does not wobble. If the relay body is marked "UP" or has an arrow, it should face up because there is a movable core inside that should move freely under the influence of gravity.
Now is the time to connect the wires according to your diagram or photo. Insert the terminals until they click, checking that the contact is secure. Poor contact will cause heating and further failure. After connecting all the wires, reinstall the fixing bracket or plastic casing, if provided by the design.
| Relay type | Number of contacts | Installation features | Compatibility |
|---|---|---|---|
| RTK (Thermal) | 2-3 | Put on the side | Old models |
| R-3 (Starting) | 2 | Put on the top | Single-phase motors |
| LS (Combined) | 3-4 | Requires precise positioning | Modern Stinols |
| PTC (Posistor) | 2-3 | Has no moving parts | Inverter and conventional |
After assembling the entire structure, you can proceed to a test run. Plug in the refrigerator and listen. The compressor should start the first time, without prolonged buzzing or clicking. If the startup was successful, let the unit run for 10-15 minutes, monitoring the temperature of the motor housing - it should not heat up too quickly.
What to do if the new relay clicks, but does not start the motor?
If the new relay makes clicks, but the compressor does not start, perhaps the problem is not in the relay, but in the compressor itself (jamming) or broken windings. The cause may also be a malfunction of the thermostat, which does not send a signal to start. Check the presence of voltage at the input to the relay at the moment when the refrigerator should be operating.
Typical errors and ways to eliminate them
One of the most common errors during installation is incorrect orientation of the relay in space. As already mentioned, many models require a strictly vertical position. If you install such a relay horizontally or upside down, the mechanism will not work correctly and the engine will not start. Always pay attention to the markings and shape of the case.
Another common problem is poor contact in the terminals. If you simply put the terminals on without making sure the connection is tight, heat will begin to build up at the contact point over time. This leads to oxidation of copper, increased resistance and, ultimately, burnt contacts. Check the tension of the terminals, if necessary, lightly tighten them with pliers (without power supply!).
Also, technicians often forget to check the condition of the thermostat. If you replace the relay and the refrigerator still does not turn on, the circuit may break earlier - on the temperature controller itself. Ring its contacts: when you turn the handle, they should close. Ignoring this stage leads to a false conclusion that the new spare part is defective.
⚠️ Attention: Do not use relays from other models of refrigerators “by eye”. Even if it is physically the right size, its current rating may not match your compressor. This will lead either to instant combustion or to the fact that it will not open the circuit, which is dangerous by fire.
Checking performance after replacement
The final stage is a comprehensive test. After successful startup, evaluate the operation of the refrigerator during the first hour. The motor should work cyclically: turn on, cool the chamber, turn off and turn on again according to the thermostat signal. Lack of cycling (constant operation or rare switching on) may indicate a freon leak or a malfunction of the thermostat.
Pay attention to the noise level. A working relay is silent or makes a barely noticeable, quiet click when starting and stopping. Extraneous sounds, buzzing, crackling or vibration indicate that something is assembled incorrectly or the new part is defective. In this case, it is better not to risk it and replace the suspicious element.
If everything went well, replace the protective back cover of the refrigerator. Do not leave the compressor open forever as dust and moisture can shorten its life. Carefully screw the panel and move the refrigerator to its normal place, observing the gaps for ventilation.
Is it possible to install a relay from another brand of refrigerator on Stinol?
Theoretically, this is possible if the electrical parameters (starting current, voltage) and geometric dimensions match. However, manufacturers often use unique housing shapes and pin arrangements. It is better to look for original spare parts or proven analogues, specifically designed for compressors installed in equipment Stinol (often Danfoss or Atlant).
Why did the new relay burn out a week after replacement?
There may be several reasons: either a low-quality device with low current characteristics was purchased, or there is a problem lies deeper. Often re-combustion indicates a malfunction of the compressor itself (turn-to-turn short circuit), which draws too much current, or problems with the mains voltage. It is also possible that the relay was installed in the wrong position.
Is it necessary to defrost the refrigerator before replacing the relay?
Full defrosting is not necessary if access to the compressor is from the rear from the bottom. However, if you plan to move a refrigerator that has been standing against the wall for a long time, or if there is a risk of damage to the tubes due to careless movement, it is better to defrost it in advance. This will also give you time to calmly study the diagram and prepare the tools.
Where to find the relay markings if they are erased?
If the markings on the case are not readable, focus on the compressor model (indicated on the sticker on the black tank itself) and the refrigerator model. Using this data, you can find a suitable replacement in spare parts catalogs. You can also visually compare the number of contacts and the form with photos on the Internet, but this is a less reliable method.