Refrigerators from the South Korean company Samsung are famous for their reliability and advanced cooling technologies, such as the system No Frost. However, like any complex household appliances, they are subject to wear and tear of components, among which the refrigerant supply valve occupies a special place. This small but critical element controls the circulation of freon between the evaporators of the refrigeration and freezer chambers.
If you notice that in one of the chambers the temperature no longer corresponds to the set one, or the compressor works without interruption, not achieving the required values, there is a high probability that the problem lies in the refrigerant distribution system. Diagnosing the valve is the first step, which allows you to avoid an expensive call to a technician or the purchase of new equipment if the fault can be fixed yourself.
In this guide, we will look in detail at how the solenoid valve works, what symptoms indicate its failure, and how you can accurately test it with a multimeter. Understanding the operating principles of this unit will help you save time and money by returning the refrigerator to its original efficiency.
Principle of operation and valve design
The valve in refrigerators Samsung is a solenoid valve that opens and closes under the influence of an electric current. When the control module applies voltage to the coil, a magnetic field is created that retracts the core and opens the passage for freon. Depending on the model of the refrigerator, the valve can be one-way or two-way, regulating flows into different cooling circuits.
Electromagnetic coil is the most vulnerable element of the design. It is she who receives electrical impulses and is exposed to thermal effects. A thin copper wire is wound inside the coil, which over time can overheat or oxidize, which will lead to an open circuit or short circuit.
⚠️ Attention: The internal pressure in the refrigerator system can reach several atmospheres. Never try to disassemble the valve body itself or disconnect the copper tubes without first removing the freon and having special tools.
The valve body is usually made of brass or durable plastic that is resistant to refrigerants and oils. It contains electrical connectors through which the control signal is received. The tightness of the connection is ensured by special gaskets, which can also wear out, causing leaks, although this happens less often than electrical breakdowns.
Technical characteristics of standard valves
Usually Samsung valves operate on 220V AC voltage, but in modern inverter models, control can be carried out by pulses of different durations. The coil power, as a rule, does not exceed 10-15 Watts, which makes them safe when handled correctly, but requires accurate diagnostics of the parameters.
Main symptoms of a malfunction
It is possible to determine that the valve has stopped functioning correctly by a number of indirect signs that appear in the operation of the refrigeration unit. The first and most obvious symptom is a violation of the temperature regime. If food begins to thaw in the freezer compartment, and water freezes in the refrigerator compartment, on the contrary, this is a direct signal of a failure in the distribution of refrigerant.
The compressor may begin to operate in emergency mode, trying to compensate for the lack of cold. You will notice that the engine hums continuously, without characteristic pauses for rest. This not only increases energy consumption, but also reduces the life of the compressor itself, which can ultimately burn out from overload.
Modern models Samsung are equipped with a self-diagnosis system that displays error codes on the display or flashes indicators.
- ❄️ Error code 22C or 22E —often indicates a communication error with a sensor or valve.
- ⚡ Code 41C —may indicate a problem with the cooling function.
- 🔊 Unusual hum or clicking in the area of the back wall where the valve.
Sometimes the malfunction is accompanied by physical signs, such as a burning smell or melted plastic in the area of the electrical connector. This indicates that a short circuit has occurred in the coil, and current flows along the path of least resistance, heating the insulation.
Preparation for diagnostics and safety measures
Before starting to check the valve, it is necessary to ensure safe working conditions. Any manipulations with the electrical components of the refrigerator require completely disconnecting the device from the network. It is not enough to simply turn off the button on the case, if there is one - be sure to unplug the plug from the socket to eliminate the risk of electric shock.
To access the valve, you will need to remove the back panel of the refrigerator. In most models Samsung it is secured with several screws that need to be carefully unscrewed. Be careful not to damage the plastic latches, which can be fragile if the refrigerator has not been disassembled for a long time.
You will need a minimum set of tools to carry out high-quality diagnostics.
- 🔧 Phillips and flathead screwdrivers for removing panels.
- 🔌 Multimeter (tester) for measuring resistance and voltage.
- 🧤 Dielectric gloves for additional protection.
- 🔦 Flashlight for illuminating hard-to-reach places.
⚠️ Attention: If you find traces of oil on the floor under the refrigerator or on the pipes, this may indicate a freon leak. In this case, further independent diagnostics without skills in working with refrigeration equipment is not recommended.
Visually inspect the connectors and wires going to the valve. Often the problem lies not in the valve itself, but in oxidized contacts or broken wires, which could be damaged by rodents or mechanical stress during cleaning.
Checking the valve with a multimeter
The most reliable way to check the serviceability of the valve solenoid coil is to measure its electrical resistance. To do this, switch the multimeter to resistance (Ohms) mode, usually indicated by the Ω symbol. The range should be selected within 20 kOhm.
Carefully disconnect the connector with wires from the valve contacts. Touch the multimeter probes to the two coil terminals. Polarity in this case does not matter, since we are measuring the active resistance of the winding. The obtained value must be compared with the standard indicators for your model.
Measurement results can be as follows:
- 📉 Resistance is within normal limits (usually 1-3 kOhm) - the coil is intact, the problem may be in the mechanical part or control.
- ♾️ Unit on the display (infinity) — open circuit, the coil is burned out and requires replacement.
- 0️⃣ Zero or close to zero value —short circuit of the turns, the coil is faulty.
Also worth check the presence of control voltage. To do this, turn on the refrigerator, leaving access to the connector. Be extremely careful, as there will be a dangerous voltage of 220 Volts at the contacts. Carefully connect the multimeter probes in the alternating voltage (ACV) measurement mode to the connector contacts at the moment when the compressor should start.
☑️ Multimeter test algorithm
If there is voltage at the connector, but the valve does not click and does not allow freon to pass through (if it is working properly resistance), the mechanical rod may have jammed inside the housing. In this case, even working electrics will not help open the passage for the refrigerant.
Table of typical values and error codes
For ease of diagnosis, below is a table with approximate resistance values for various types of valves used in technology Samsung. Remember that the exact parameters may vary depending on the year of manufacture and the specific series of the refrigerator.
| Valve type | Normal resistance | Typical error code | Probable cause |
|---|---|---|---|
| Single-way (1-way) | 1.2 - 1.8 kOhm | 22C / 22E | Coil break |
| Two-way (2-way) | 2.0 - 3.5 kOhm | 41C / 42C | Short circuit |
| Three-way (3-way) | 1.5 - 2.5 kOhm | 24C / 26C | Mechanical wedge |
| Inverter module | Depends on the model | Combinations | Electronics failure |
If your measurements differ radically from the values in the table, this is almost guaranteed to indicate the need to replace the component. However, you should not ignore the condition of the wiring leading to the valve, since poor contact can distort the readings.
Replacing the refrigerator valve
If the diagnostics confirmed a valve malfunction, it needs to be replaced. This process requires the availability of a new original or high-quality analog component. It is important to select a valve with exactly the same characteristics and fitting dimensions as the failed one.
To replace it, you will need to unsolder the copper tubes, which involves the use of a gas torch and solder. This is a complex operation that requires skills and safety precautions when working with open fire. After installing a new valve, the system must be evacuated and charged with freon in strict accordance with technical requirements.
⚠️ Attention: Replacing the valve yourself without evacuating the system and charging with freon is impossible. If you do not have the appropriate equipment, it is better to replace only the electric coil (if the design allows) or entrust the work to a professional.
When installing a new valve, make sure that the arrow on the body coincides with the direction of refrigerant flow. Incorrect installation will result in the system not working, and the compressor can quickly fail due to operation on vacuum or high pressure.
Frequently asked questions (FAQ)
Is it possible to temporarily short-circuit the valve to make the refrigerator work?
No, this is absolutely not allowed. The valve is a controlled element, and its constant opening or closing will disrupt the refrigerator’s operating cycle, which will lead to either defrosting of food or freezing of the evaporator and breakdown of the compressor.
Why does the valve coil heat up?
Slight heating up to 40-50 degrees is the norm during operation. However, if the coil becomes so hot that it cannot be touched, this is a sign of an interturn short circuit or incorrect voltage supply from the control board.
How often do you need to change the valve in a Samsung refrigerator?
Under normal operating conditions and a stable voltage in the network, the valve lasts as long as the refrigerator itself (10-15 years). Frequent replacements may indicate problems with electrical wiring in the house or power surges.
Does the quality of freon affect the operation of the valve?
Yes, the presence of moisture or acid in the system (for example, after poor-quality past repairs) can lead to corrosion of the internal parts of the valve and its jamming. The purity of the refrigerant is critical to the longevity of the system.
What to do if after replacing the valve the error does not disappear?
It is necessary to reset the error in the control module memory (usually by turning off the power for 10-15 minutes). If the error returns, check the power circuit from the board to the valve - perhaps the problem is in the control board itself or the temperature sensors.