A sudden stop in the operation of a refrigeration unit often takes you by surprise, especially when there are perishable products left inside. One of the most common culprits of such breakdowns in technology Samsung is the failure of the start-up relay. This small but critical element is responsible for starting the compressor motor and protecting its windings from overloads. Understanding how to properly remove and replace this part can save a significant amount on calling a technician.
Before taking active steps, you must clearly understand the risks associated with electricity. High voltage in the compressor circuit poses a real threat to life if you do not follow basic safety rules. Even after disconnecting from the network, the capacitors may retain a charge, so rushing here is unacceptable. Your task is to act calmly, consistently and with a full understanding of the unit's structure.
In this article we will analyze in detail the process of dismantling the relay, consider typical signs of its malfunction and answer questions that arise among owners of refrigerators Samsung various series. You will learn what tools you will need, how to distinguish a burnt part from a working one, and whether it is even worth doing the repair yourself. Correct diagnostics at the initial stage will allow you to avoid purchasing unnecessary spare parts.
Diagnostics of a faulty start relay
Symptoms of failure of a start protection device are often similar to a breakdown of the compressor itself, which can mislead an inexperienced technician. The most characteristic sign is the so-called “clicking”: the refrigerator tries to start, there is a click, the motor hums for a couple of seconds, then another click and silence. This indicates that starting winding does not receive the required impulse or the current in the working winding is too high, and the protection opens the circuit.
Visual inspection often provides more information than long-term measurements with a multimeter. If during dismantling you find melted plastic, traces of burning or a characteristic smell of burnt insulation, then the issue of replacement can be considered resolved. However, the external integrity of the case does not guarantee the serviceability of the internals. In some cases, the contacts inside simply oxidize or stick, preventing the starter from working correctly.
It is also worth paying attention to the behavior of the refrigerator as a whole. If the unit turns on, runs for a while, but does not reach the desired temperature, or the compressor runs continuously without shutdowns, this may indicate that the relay contacts are stuck in the closed state. In such a situation, the engine does not receive a signal to stop, which leads to its overheating and eventual activation of the thermal protection.
⚠️ Attention: If, after the relay clicks and an attempt to start the compressor, the circuit breaker in the apartment panel is knocked out, under no circumstances try to turn on the refrigerator again. This is a sure sign of a short circuit in the motor windings or an insulation breakdown, which requires professional diagnostics.
Necessary tools and preparation of the workplace
For successful repair work, you will not need a whole arsenal of professional equipment, but a minimum set of tools should be at hand. You will definitely need a flathead and Phillips screwdriver to remove the protective covers. In some models Samsung the fasteners may be hidden, so having a thin awl or needle to carefully pry up the latches will not be superfluous.
To diagnose the part itself, you will need a multimeter (tester) with a continuity or resistance measurement mode. Without this device, replacing the relay is done “at random,” which is not always effective, since the reason may lie in the compressor itself. Also prepare a container for small parts so as not to lose screws, and a flashlight to illuminate hard-to-reach areas at the bottom of the unit.
Pay special attention to organizing the workspace. You will need clear access to the back wall of the refrigerator, so move the appliance away from the wall in advance. Make sure the floor is dry and clean and there is sufficient lighting for working with small electrical components. Do not forget to prepare a dry rag to clean the contacts from dust and oxides.
☑️ Preparation for repair
Order of access to the compressor compartment
Access to the start relay in refrigerators Samsung traditionally located in the lower rear part of the case. The first step is to completely disconnect the device from the power supply. Unplug and let the appliance sit for 10-15 minutes to allow the pressure in the refrigerant system to equalize and the capacitors to discharge. This is a critical safety step.
Next, you need to remove the rear metal panel covering the compressor. It is usually secured with several screws around the perimeter. In some modern models, the panel may be held in place by plastic latches, which require careful handling to avoid breaking the fragile plastic. Use a screwdriver of the appropriate size so as not to tear off the slots on the screw heads.
After removing the cover, you will see a view of the compressor - a black “barrel” at the bottom of the unit. The relay is mounted directly on the terminals of the compressor windings and is often covered with an additional plastic casing or secured with a metal bracket. In models with the system No Frost access may be slightly difficult due to the presence of additional tubes or ventilation elements that need to be carefully bypassed.
Technology for dismantling the starting relay
The process of removing the relay depends on the type of fastening used in a particular model Samsung. Most often, the relay is simply put on the three pins of the compressor and secured with a metal clamp strip. To remove it, you need to carefully squeeze out the springy tendrils of this bar and pull the part down. Do not use excessive force to avoid damaging the compressor terminals.
If the relay is mounted on a terminal block, you will first need to disconnect the wires that go to it. Before doing this, it is strongly recommended to remember or photograph the color coding of the wires. Usually these are two or three wires coming from the power cord and the thermostat. There is no need to bite off the wires - just loosen the clamps or press out the connector clamps.
When removing, pay attention to the condition of the seat. There should be no traces of moisture, corrosion or melting. If you find oxides on the compressor contacts, they should be cleaned with fine sandpaper or an eraser until shiny. This will ensure reliable electrical contact with the new relay.
⚠️ Attention: Never pull the relay by the wires! This may cause internal wiring to break or insulation to become damaged, creating the risk of a short circuit in the future. Hold only the body of the part.
Checking the functionality of the removed part
After the relay is in your hands, it needs to be checked. Visual inspection begins by shaking the part near the ear. If a rattling sound is heard inside, similar to the rattling of bolts in a can, it means that the insides are destroyed and the part requires replacement. A working relay should not make any extraneous sounds when shaking.
Next, the multimeter comes into play. Switch the device to resistance (Ohm) or continuity measurement mode. For different types of relays (PTC starters and electromagnetic), the methodology may differ, but the basic principle is the same: the contacts must ring in a certain position or not ring at all. For example, the resistance between the contacts of the working and starting windings should be close to zero at a certain position, and the thermal protection should “ring” in a cold state.
If you have the opportunity, compare the tester readings with data from the technical documentation or serviceability table. The absence of resistance where it should be, or, conversely, infinite resistance in a closed circuit indicates a malfunction.
| Test type | Good condition | Fault | Action |
|---|---|---|---|
| Visual | Entire body, no burning | Melts, cracks, smell | Replacement |
| Shaking | Silence | Rumble, rattle | Replacement |
| Continuity (Ohm) | Resistance is present/not according to the circuit | Short circuit or break | Replacement |
| Thermal protection | Rings when cold | Does not ring (break) | Replacement |
What is a PTC relay?
A PTC relay (posistor) is a part whose resistance increases sharply when heated. At the moment of switching on, it passes current to the starting winding, heats up and opens the circuit, leaving only the main winding to work. This is a reliable and simple design that has no moving parts.
Installing a new relay and testing the system
Installing a new spare part is done in the reverse order of removal. Make sure the new relay has exactly the same markings as the old one. Even if they are similar in appearance, the electrical characteristics (operation current, connection type) may differ. The marking is usually applied to the side edge of the housing, for example, RT-12 or PTC-15.
Carefully place the relay on the compressor pins until a characteristic click or tight fit occurs. Connect the wires according to the photographs or color scheme you took earlier. Check that all connections are securely fastened - they should not be loose. Install the protective cover and screw the back panel of the refrigerator into place.
The final stage is to plug in the refrigerator. In the first seconds, listen carefully to the operation of the unit. The compressor should start with a characteristic hum, without buzzing and a subsequent shutdown click. After 10-15 minutes of operation, check the heating of the relay housing - it may be warm, but not hot. If the refrigerator begins to get cold, it means that the repair was completed successfully.
⚠️ Attention: Technical characteristics of compressors and relays may vary depending on the year of manufacture and the specific series of the Samsung refrigerator. Always check the marking of the new part with the original, since there are no universal solutions for all models.
Frequently asked questions (FAQ)
Is it possible to start Samsung refrigerator without a relay?
Theoretically, you can start a compressor without a starting relay by applying voltage directly to the starting winding for a short time, but doing this is strictly not recommended in domestic conditions. This requires special skills, carries the risk of electric shock and can permanently kill the compressor due to the lack of thermal protection. In addition, without a relay, the refrigerator will not be able to operate in an automatic cycle.
Where can you find the relay markings on a Samsung refrigerator?
The marking is applied directly to the body of the relay itself (a black or white plastic cube). To see it, the part will have to be removed. There is no this information on the back wall of the refrigerator or in the instructions, since the relay is a consumable component selected for a specific motor-compressor.
Why did the new relay burn out a week after replacement?
If the new relay failed so quickly, it means that the cause of the breakdown was not in it. Most likely, the problem lies in the compressor itself (turn-to-turn short circuit of the windings), in a malfunction of the thermostat (which prevents the compressor from turning off), or in power surges in the network. It is also possible that a relay with unsuitable characteristics was installed.
How much does it cost to replace a relay at a service center compared to self-repair?
Independent replacement will cost you only the cost of the part (usually from 500 to 1500 rubles). At the service center, the cost of the spare part will be added to the cost of the technician’s work, diagnostics and visit, which in total can amount to 3000-5000 rubles or more. However, if you are not confident in your abilities, it is better to overpay to professionals so as not to damage the expensive compressor.