The situation when your Samsung refrigerator suddenly stops cooling, and only a quiet hum or a characteristic click is heard from the engine compartment, is familiar to many owners of household appliances. Most often, the reason for this behavior is the failure of the start-up relay, which is responsible for starting the compressor. It is important for owners to understand that timely diagnosis of this part can save an expensive motor from burning out and avoid complex repairs of the entire system.
In this article we will look in detail at how to independently determine a relay malfunction, what tools will be required for this, and what to pay special attention to during a visual inspection. You will learn how to distinguish a burnt part from other problems in the electrical circuit and whether it is even worth undertaking DIY repairs in a particular case. A competent approach to diagnostics will save you time and money.
Before starting disassembly, you need to make sure that the problem lies precisely in the trigger mechanism, and not in the lack of voltage in the network or a burnt-out thermostat. Start relay - this is a relatively inexpensive component, but its failure paralyzes the operation of the entire unit. Let's figure out how to correctly identify this breakdown.
Main signs of a malfunction of the starting relay
The first bell signaling problems with starting the engine is a characteristic sound. If you hear the refrigerator trying to turn on, there is a loud click, but the compressor does not start, and after a few seconds the click repeats, this is a sure sign of a problem. The motor may hum for a couple of seconds, heat up, but never reach operating mode, after which the protective automation opens the circuit again.
Another important symptom is the complete absence of cold in the chambers when the lighting is on. In some models Samsung with the system No Frost the fan may continue to operate, creating the illusion of normal operation, but the temperature will rise. If at the same time the compressor itself remains cold or barely warm, while it should heat up during operation, this indicates that there is no current flowing to the motor windings.
⚠️ Attention: If you smell a burning smell or see melted plastic in the area of the engine compartment, immediately unplug the refrigerator. Operating equipment with a short circuit in the starting circuit can lead to fire or complete failure of the compressor.
It is also worth paying attention to the cyclic operation. A working unit operates in cycles: turned on, cooled, turned off. If the intervals between clicks are only 10-20 seconds, and the refrigerator hums jerkily, it means that the starting winding does not receive an impulse to start. This leads to rapid overheating and tripping of the thermal release.
Preparation for diagnostics: tools and safety
To carry out high-quality diagnostics, you will need a minimum set of tools that most home craftsmen can find. The key device is multimeter, which allows you to measure the resistance of the circuit and check the integrity of the contacts. Without this device, the check will only be visual and will not give a 100% guarantee of the serviceability of the internal elements.
In addition to the measuring device, prepare a flat-head and Phillips screwdriver for removing the back cover and dismantling the compressor casing. You may also need pliers to carefully remove the terminals and insulating tape to mark the wires so as not to mix up the contacts during assembly. Don't forget a flashlight, as lighting in the engine bay is often insufficient.
Safety is the number one priority when working with electrical appliances. Before starting any work, you must completely turn off the power to the refrigerator by removing the plug from the socket. Even if you simply remove the cover, the risk of accidentally touching live parts is high, especially if the equipment has not been serviced for a long time and has insulation damage.
☑️ Safety check before repair
The procedure for removing and visually inspecting the relay
Having reached the compressor, you will see a small box attached on the side or top of the motor. It is in it that the required relay is located. To remove it, it is usually enough to simply pull the casing down or to the side, after first disconnecting the wires if they are secured with terminals. In some models Samsung it may be necessary to remove the metal clamp.
After removing the device from its seat, perform a thorough visual inspection. Look for traces of soot, melted plastic, blackened contacts, or blistering of the case. If you hear a rattling sound inside the case when shaken, this means that the internal mechanical parts are damaged, and the part definitely requires replacement.
Pay special attention to the contact group. Carbon deposits on the contacts can prevent the normal flow of current. If there are no visual defects, this does not yet indicate serviceability, since the problem may be hidden in a bimetallic plate or inductor, which are not visible without disassembly. However, the presence of external defects immediately answers the question about the cause of the breakdown.
Is it possible to repair the relay instead of replacing it?
Theoretically, if the problem is only burnt contacts, they can be cleaned. However, modern relays are often made in a non-separable, cast-in casing, and any attempt to open it violates the tightness and calibration, so professionals only recommend replacement.
Checking a relay with a multimeter: step-by-step instructions
The most reliable diagnostic method is to test the circuit using a multimeter. Switch the device to resistance measurement mode (Ohms). First, check the integrity of the inductor: attach the probes to the corresponding contacts. The device should show a certain resistance value, usually in the range from 3 to 60 Ohms, depending on the model and power of the compressor.
If the multimeter shows one (infinity), then there is a break in the coil and the relay will not be able to create a magnetic field to lift the core. In this case, replacement of the part is inevitable. Also check the thermal release: in a cold state, its contacts should be closed, and the device should show zero or close to zero resistance.
It is important to check the contacts that go to the compressor windings. Make sure there is no short circuit between the relay body and the contacts. To do this, one probe is applied to the metal case (if there is one) or a common wire, and the other to the relay contacts. The resistance should be infinite.
Table of typical values and error codes
When diagnosing, it is useful to focus on typical resistance values for various components of the starting system. Below is a table that will help you interpret multimeter readings and understand how critical deviations are for your model.
| Check item | Normal reading | Fault symptom | Probable cause |
|---|---|---|---|
| Starting coil | 3 - 60 Ohm | Infinity (1 on the screen) | Open coil winding |
| Thermal relay | 0 Ohm (closed) | Infinity | The heating element or contacts have burned out |
| Contacts for breakdown | Infinity | Any value resistance | Insulation breakdown on the housing |
| Compressor (windings) | 10 - 40 Ohm | 0 Ohm or infinity | Interturn short circuit or break motor |
You should not ignore readings that are at least slightly different from the norm. Even a slight change in resistance may indicate that the process of degradation of the insulation or contact group has begun. In the long term, this will lead to repeated failure.
Replacement of the relay and final assembly of the refrigerator
If diagnostics confirm the malfunction, you must purchase a new part. When choosing, pay attention not only to the brand Samsung, but also to the marking of the relay itself, which is applied to the body. Matching the compressor model and relay type (PTC or induction) is a prerequisite for successful repair.
Installation of a new part is carried out in the reverse order of removal. Carefully push the relay onto the compressor contacts until you hear a characteristic click or stop. Make sure it fits snugly and doesn't wobble. Connect the wires to the terminals, observing the polarity if it is marked, although in AC starting circuits this is often not critical, it is better to follow the color markings.
After assembling all the components, do not rush to close the back cover. Plug in the refrigerator and listen. The compressor should start the first time, without long hums and repeated clicks. If the start-up was successful, let the equipment run for 15-20 minutes, monitoring the heating of the motor and the appearance of cold in the chamber.
⚠️ Attention: Technical characteristics of compressors and relays may vary depending on the year of manufacture and the specific series of the refrigerator. Always check the marking of a new part with the data on the nameplate of your device or in the service documentation.
Frequently asked questions (FAQ)
Is it possible to start a Samsung refrigerator without a relay?
Theoretically, start You can operate a motor without a starting device using a button or special devices to artificially supply an impulse to the starting winding. However, this is a temporary diagnostic measure. Constant operation without a relay will lead to rapid burning of the compressor starting winding due to the lack of phase shift and protective shutdown.
Why does a new relay burn out after a short time?
If a new relay fails quickly, the reason often lies not in the part itself, but in the condition of the compressor. A tight stroke of the piston group, an interturn short circuit in the motor windings, or problems with the capacitor (in two-phase motors) create an overload that the relay cannot withstand. Also, the cause may be unstable voltage in the network.
What is the difference between a PTC relay and an induction relay?
PTC relay (posistor) works based on a change in the resistance of a ceramic element when heated and is more often found in modern models. Induction (with a coil and core) uses the electromagnetic principle of opening contacts. They are not always interchangeable, as they have different characteristics and connection diagrams.
Is it worth changing the relay yourself or calling a specialist?
Replacing a relay is one of the simplest operations in repairing refrigerators, accessible to a beginner with a multimeter and a screwdriver. If you are confident in the diagnosis and have selected the correct spare part, self-repair is economically feasible. However, if there are doubts about the serviceability of the compressor, it is better to entrust the diagnosis to a professional.