When your refrigerator Samsung with system No Frost stops freezes or begins to make strange clicking sounds, the first thought of the repairman is often to check the starting device. It is this small component that is responsible for starting the compressor, and its failure is one of the most common causes of breakdown of household appliances. However, before buying a new part, you need to determine exactly where it is located and how to get to it, since the design of different models may differ significantly.
In refrigerators of the South Korean brand Samsung the relay is usually integrated into the overall compressor control system or placed in a separate unit, which depends on the year of manufacture and series of the unit. Understanding your model will help you avoid wasting time and preventing damage to the fragile plastic fasteners during disassembly. In this article we will analyze in detail all possible options for the location protection relay and trigger mechanism.
Main types of relays in the No Frost system
Before you start searching, it is important to understand that in the refrigerator there may be several relays that perform different functions. The main element is starting relay, which supplies an impulse to the compressor motor winding. It can be combined with a thermal protection relay, which turns off the motor if it overheats. In modern inverter models Samsung this system has been replaced by an electronic control module, but in classic lines classic mechanics are still found.
The second type is defrost relay (or timer), which controls the defrosting cycles of the evaporator. The third option is an electromagnetic relay on the control board, which switches the voltage to various nodes. Inexperienced users often confuse these parts, so it is important to immediately determine which element has failed. If the compressor hums, but does not start, or clicks and is silent, the problem is in the starting mechanism.
What is the difference between the relays in inverter and conventional models?
In classic Samsung refrigerators there is a separate starting relay on the compressor housing. In inverter models (Digital Inverter), there is no starting relay as such - its function is performed by an inverter control unit located separately.
It is worth noting that in some models No Frost a combined design is used, where the starting and protective devices are combined into one housing. This simplifies replacement, but requires more accurate diagnosis before purchasing a spare part. If you are not sure about the type of compressor you have, it is better to check the technical documentation or service manual of a specific model.
Where to look for the relay: external rear panel
The most common place where the relay is located in the refrigerator Samsungis the back of the unit, in the lower area, directly next to compressor. In classic models, it is accessed through a removable panel secured with screws or plastic latches. You will need a Phillips screwdriver and possibly a ratchet wrench to remove the fasteners.
After removing the protective cover, you will see a black cylindrical or pear-shaped compressor. The relay is usually placed directly on the contact group coming out of the motor housing, or attached to a metal bracket next to it. Visually, it is a small box of black or white color with wires suitable for it. Be careful: this compartment may also contain condenser tubes that can be easily damaged.
- 🔍 Visual inspection: Look for a plastic block with markings placed on the compressor pins.
- 🔌 Checking the wires: The wiring harness from the main control board always fits the relay.
- 🛡️ Protective casing: Sometimes the relay is covered with an additional plastic cap for insulation.
If you see the compressor, but do not see the characteristic block on its contacts, carefully check the space around the motor. Do not use excessive force to avoid tearing off the tubes.
Access through the internal rear casing
In a number of refrigerator models Samsung with the system No Frost, especially in series with a side-mounted freezer compartment, access to electrical components can be organized through the internal wall of the refrigerator compartment. This is done to improve the aesthetics of the appearance and protect the components from dust. In this case, you will have to partially disassemble the inner chamber.
To gain access, you need to clear the shelves, remove the top cover (if there is one) and unscrew the screws holding the back plastic panel inside the refrigerator. Underneath it is often hidden evaporator a control unit with a relay. This type of design is typical for more modern lines, where maximum energy efficiency and noise insulation are important.
⚠️ Attention: When removing the inner panel, be extremely careful with the plastic clips - they are often frozen and brittle. Allow the refrigerator to thaw for 30 minutes before disassembling.
If the relay is located inside, it can be mounted on a special metal frame or directly on the evaporator body. In this case, replacement requires care so as not to damage the polyurethane foam insulation. Often the defrost sensor is also located here, which is also worth checking for integrity.
Lower front part and plinth
The third location option, which is less common, but is typical for some built-in models Samsung and units with a bottom freezer, is the plinth area in the front. Not only the starting relay can be located here, but also the main electronics unit, in which switching elements are built-in. Access is through a removable decorative grille at the bottom of the refrigerator.
To get to the relay in this area, you need to remove the baseboard strip. Usually it is held on by latches or two or three screws. Behind it there is access to the condenser unit and, in some cases, to the lower part of the compressor, where it can be installed thermal relay. This layout option facilitates maintenance, since it does not require moving the heavy unit away from the wall.
However, if we are talking about a classic starting relay, then even with frontal access to the base, the mechanism itself most often remains attached to the compressor, which can be reached by hand without removing the entire casing. The main thing is to ensure good lighting of the work area, since there is not much space there.
Diagnostics and signs of malfunction
Before changing the relay, you need to make sure that it is the problem. A characteristic sign of a faulty starting device is the cyclic turning on and off of the compressor. You hear a click, the engine tries to start, hums for a few seconds, then a second shutdown click is heard, and there is silence. After some time, the cycle repeats.
If the relay is stuck in the on state, the compressor can work continuously without turning off, which will lead to severe freezing of the evaporator and overload of the system. In the case of a thermal relaythermal relay
| Symptom | Probable cause | Action |
|---|---|---|
| Clicks, no start | Starting relay burned out | Replacing the relay |
| Buzzes and turns off | The compressor is jammed or relay | Checking the windings |
| No frost, silence | Thermal relay break | Ring tester |
| Works without stopping | Contacts sticking | Replacement or cleaning |
For accurate diagnostics, use a multimeter. Ring the relay contacts: in good condition, the resistance should be close to zero (for closed contacts) or infinite (for open ones), depending on the type of device. Visually, plastic melts or black burnt spots are often visible on a burnt relay.
The process of replacing a relay with your own hands
Replacing a relay in a refrigerator Samsung is a procedure that is accessible even to a beginner, if you follow safety precautions. The first step should always be to completely disconnect the unit from the power supply. Unplug the cord from the outlet and wait 10-15 minutes for the capacitors to discharge and the pressure in the refrigerant system to drop.
Once you reach the relay, carefully remove the retaining bracket or plastic clip. Remove the part from the compressor pins. If the relay is tightly seated, do not pull it by force - slightly rock it from side to side. Disconnect the wires after first remembering or photographing their location. Install the new part in the reverse order, making sure that it is seated all the way and secured.
☑️ Algorithm for replacing the relay
After assembly, turn on the refrigerator and listen. The launch should be soft, without unnecessary clicks or buzzing. If the compressor starts running smoothly, leave the unit idling for 2-3 hours without loading food to make sure that the temperature is stable.
Common mistakes during self-repair
One of the most common mistakes is installing a relay from a different compressor model. Despite the external similarity, the characteristics starting windings of different motors may differ. Installing an unsuitable relay will cause it to burn out quickly or damage the compressor. Always use parts with identical markings.
Also, amateur craftsmen often forget to check the condition of the contact group on the compressor itself. If the pins are oxidized or burnt, the new relay will not last long. Before installation, clean the contacts with fine sandpaper or a special contactor spray. Do not use aggressive chemical solvents for cleaning, which can corrode the plastic.
⚠️ Attention: Never try to start the compressor directly, bypassing the relay and protection. This can lead to a fire or failure of the motor windings in a matter of seconds.
Another mistake is ignoring the cause of the relay failure. If the relay burns out, this is often the result of a power surge or problems with the compressor itself (for example, high pressure in the system). Simply replacing a part may not solve the problem for a long time if the root cause is not eliminated.
Can a relay be repaired?
In some cases, an old relay can be revived if the contacts are simply burnt inside or the mechanical tongue is stuck. However, the service life of such repairs is unpredictable, and it is safer to install a new component.
When to contact a professional
Despite the apparent simplicity, there are situations when independent repair is undesirable. If after replacing the relay the refrigerator does not turn on, or you smell a burning smell, stop trying to start immediately. Perhaps the problem lies deeper - in the control board or the motor-compressor itself.
Also, the help of a specialist is necessary if the relay needs to be replaced in models with an inverter compressor. There, the control system is much more complex, and simply replacing the “box” will not help - diagnostics of the electronic unit is required. In addition, if you notice a freon leak or damage to the tubes during disassembly, you cannot do without a technician and equipment for refilling.
A qualified technician has the necessary tools and a supply of original spare parts. Samsung. He will be able to accurately diagnose the malfunction, check the tightness of the system and provide a guarantee for the work performed. Remember that saving on diagnostics can lead to more expensive repairs in the future.
FAQ: Frequently asked questions
How much does it cost to replace a relay in a Samsung refrigerator?
The cost consists of the price of the part itself (from 500 to 2000 rubles depending on the model) and master's work. Independent replacement will only cost the cost of the spare part.
Is it possible to use a universal relay?
Yes, there are universal starting relays (for example, the PZR series or their analogues) that are suitable for many compressor models, but it is better to look for the original or a complete analogue by code.
Why a relay does it burn out constantly?
Frequent combustion indicates unstable voltage in the network, compressor wear (difficult starting) or a malfunction of the thermostat that does not allow the motor to rest.
Where to buy an original relay for Samsung?
Original spare parts can be purchased at authorized Samsung service centers or in specialized stores of spare parts for household appliances, checking the part code.
Is it necessary to defrost the refrigerator before replacing?
Full defrosting is not necessary if access to the relay is from the rear. However, if you remove the inner panel, it is advisable to let the ice thaw so that water does not get on the electrics.