A sudden stop in the operation of refrigeration equipment always becomes an unpleasant surprise that requires immediate intervention. If you notice that the compressor hums but does not start, or does not make any sounds at all, most likely the problem lies in the engine starting system. In most cases, the culprit of such a malfunction is starting relaywhich is responsible for supplying voltage to the motor windings at the time of start.
Independent replacement of this component is a very real task for a person who has basic skills in working with tools and basic knowledge in electrical engineering. Correctly connecting the Samsung refrigerator relay allows you to restore the unit’s functionality without calling a technician, saving a significant amount on service costs. However, it is important to understand that careless work with electrical components can lead to more serious damage.
Before proceeding with disassembly, you must completely disconnect the device by unplugging the plug from the socket. This is the first and most important safety rule, which cannot be ignored. Next, you should prepare a workplace with good lighting and provide access to the rear of the housing, where the compressor unit is located.
Diagnostics of a malfunction of the starting relay
Before buying a new part, you need to make sure that the problem lies in it, and not in the compressor itself or the wiring. The main sign of failure of the trigger mechanism is a characteristic click, followed by a humming sound from the motor that lasts several seconds, after which it clicks again and stops. This cycle can repeat indefinitely until you unplug the unit.
Visual inspection can also provide important clues about the condition of the component. If traces of carbon deposits, melted plastic, or a burning smell are visible on the body, then replacement is necessary urgently. Sometimes you can notice traces of oxidation of the contacts inside the case, which also prevents the normal transmission of current.
⚠️ Attention: If after removing the relay you see that the thermal protector rod or contacts are severely damaged, do not try to clean or restore them - this is a temporary measure that can lead to a fire hazard.
For more accurate diagnostics, you can use multimeter in dialing mode. The resistance between the contacts must correspond to the specifications of the specific model, and in the open state the circuit must be broken. The lack of response of the device or, conversely, a constant short circuit will indicate the need to replace the element.
Choosing a suitable relay for the compressor
The spare parts market offers many options, but for equipment Samsung it is important to select components that meet the original specifications. Start relays differ in the type of connection (vertical or horizontal), the number of contacts and the type of compressor for which they are intended. Using an unsuitable part can lead to rapid failure of the new component or the engine itself.
When choosing, you should pay attention to the markings on the body of the old part. The most commonly used relays are the PTC series (with a posistor) or induction. For modern inverter models Digital Inverter the replacement procedure may differ, since there the control function is taken over by an electronic module, and a mechanical relay may be absent or have a different design.
How do PTC relays differ from induction ones?
PTC (posistor) relays work by changing the resistance of the heating element when the passage of current, opening the circuit after starting. Induction uses an electromagnetic coil to open contacts. They are not interchangeable without changing the connection diagram.
Below is a table that helps determine the type of relay by external features and markings:
| Relay type | Characteristic markings | Application | Features |
|---|---|---|---|
| Posistor (PTC) | Series P, R, PT | Single-phase compressors | Plastic case, ceramic element inside |
| Induction | Series M, S | Powerful motors | Presence of a coil and a moving core |
| Combined | With thermal protector | Standard models | Includes overheating protection |
If you are not sure of the choice, it is better to remove the old part and bring it to the store or look for an analogue using the exact catalog number. Universal relays exist, but they require careful configuration and checking the compatibility of the current characteristics.
Tools and preparation for work
To successfully complete the work of replacing a Samsung refrigerator relay, you will need a minimum set of tools. The main tool will be a flathead and Phillips screwdriver for removing protective covers and dismantling clamps. You may also need pliers with narrow jaws to work with latches and wires.
Be sure to have a multimeter ready to test the circuit after installing a new part. This will ensure that there is no short circuit before turning on for the first time. It would be a good idea to have a flashlight, since the compressor area is often darkened and access to it is limited.
☑️ Checking readiness for repair
The work area should be dry and well lit. If the floor in the room is cold or damp, place a rubber mat or wooden board to reduce the risk of electric shock if you accidentally touch grounded objects. Remember that even when the device is unplugged from the socket, it can store a residual charge in the capacitors, although this is rare in mechanical relays.
The process of dismantling the old relay
Dismantling begins with removing the compressor protective cover, which is usually secured with latches or screws. Be careful, the plastic becomes brittle over time and may crack if not handled carefully. After removing the casing, you will have access to the compressor and the relay attached to the side or top.
The relay itself is fixed on three contacts of the compressor and is often additionally secured with a metal bracket or plastic retainer. To remove it, you need to carefully press the latches and pull the housing down. Do not use excessive force to avoid damaging the appropriate wires.
⚠️ Attention: Before disconnecting the wires, be sure to take a photo of the connection diagram or sketch the location of the terminals. Mixed-up contacts can lead to burnout of the compressor winding.
The wires should be disconnected by holding the connector, and not by pulling the cable itself. If the terminals are oxidized and feel tight, you can gently spray them with contact spray or gently wiggle them from side to side. After removing the relay, inspect the contacts on the compressor - they should be clean and free of corrosion.
Connection diagram and installation of a new relay
Installation of a new relay is carried out in the reverse order of dismantling. It is important to correctly orient the part relative to the compressor: the arrow or inscription UP on the relay body should look straight up. This is critical for the correct operation of the contact opening mechanism under the influence of gravity.
Push the relay onto the compressor contacts all the way, making sure that they fit tightly into the sockets. Then connect the wires to the appropriate terminals. In most models Samsung the diagram is as follows: two wires come from the thermostat and the starting winding, one from the working winding, and one from grounding (if provided).
If the number of contacts on the new relay differs from the old one, carefully study the attached instructions. Sometimes it is necessary to switch the terminals or use the adapters included in the kit. The main thing is to ensure reliable contact without gaps.
After connecting all the wires, secure the fixing bracket or plastic holder. Make sure that the wires do not touch hot parts of the compressor or moving parts (if your model has them). All connections must be isolated and protected.
Operation check and startup
Before installing the protective casing in place, it is recommended to conduct a test run of the system. Plug in the refrigerator and listen. After a few seconds, a characteristic click should be heard, and the compressor should start with a smooth hum.
Check the starting current using a current clamp, if possible. It must not exceed the nominal values indicated on the compressor nameplate. If the motor hums but does not start, or immediately knocks out the plugs, you must immediately turn off the power and recheck the connection diagram.
After making sure that it is operating normally, install the protective cover and push the refrigerator into place. Leave the unit to operate without load for several hours to check the stability of the temperature regime and the absence of extraneous noise.
⚠️ Attention: If after replacing the relay the compressor works, but does not create sufficient cold, the problem may be a freon leak or a clogged system, and not an electrical problem.
Frequent errors when doing it yourself replacement
One of the most common mistakes is ignoring the orientation of the relay during installation. An inverted element will not be able to correctly open the circuit, which will lead to overheating and burnout of the starting winding. Also, users often forget to secure the fixing bracket, which is why the vibration of the compressor breaks the contact over time.
Another mistake is using a relay with an inappropriate response current. If the cut-off current is too large, the relay will not open the starting winding in time, causing overheating. If it is too small, the compressor will not start. Always check the marking Samsung and the characteristics of the motor.
Some craftsmen try to clean the contacts of the old relay with sandpaper. This is strictly forbidden, since the coating of the contacts is damaged, and they begin to spark and burn even faster. Replacement is always more effective and safer than repair.
Why does a new relay burn out immediately after installation?
Most often this happens due to a malfunction of the compressor itself (interturn short circuit), which consumes too much starting current, or due to incorrect orientation of the part during installation.
FAQ: Frequently Asked Questions
Is it possible to install a relay from another manufacturer on a Samsung refrigerator?
Yes, it is possible if the electrical characteristics (cut-off current, voltage) and the geometric dimensions of the seat match. However, original parts Samsung guarantee better compatibility and durability.
How often do you need to change the starting relay?
The service life of the relay is not strictly regulated, but on average they last 5-10 years. Frequent power surges in the network can significantly reduce this period. They are changed only when malfunctions occur.
Why does the compressor hum, but the relay does not click?
This may indicate sticking contacts inside the relay or that the current in the circuit is insufficient to operate the electromagnet. There may also be a malfunction of the compressor itself, which is “jammed.”
Is it safe to change the relay yourself without experience?
If you follow safety rules, know how to hold a screwdriver in your hands and carefully follow the instructions, the risk is minimal. The main thing is not to connect the wires at random.
What should you do if, after replacing the relay, the refrigerator turns on for 10 seconds and turns off?
Most likely, the thermal protection is triggered. The reasons may be a malfunction of the new relay, overheating of the compressor, or problems with the condenser ventilation. Check the cleanliness of the radiator at the back.