The situation when Samsung refrigerator stops turning off causes anxiety for any owner. The hum of the engine, which does not subside day or night, is not just background noise, but a signal that the cooling system is working in emergency mode. If the unit hums constantly, trying to reach the set temperature, this can lead to overheating of the engine, increased energy consumption and food spoilage.
The first thing to do when a problem is detected is to carry out an initial visual diagnosis. Often the reason lies not in the failure of the electronics, but in a banal violation of operating conditions or the tightness of the cameras. Owners should listen carefully to the operation of the equipment: does it make extraneous sounds, or simply does not stop the standard operating cycle.
If you notice that the unit has been working without interruption for more than a day, you cannot ignore it. Constant load on compressor reduces its life, and in some cases can cause a fire. Let's look at the main causes of the malfunction and methods for eliminating them so that you can understand whether you need to call a technician or the problem can be solved yourself.
External factors and violations of operating conditionsBefore disassembling the equipment or calling repairmen, it is worth eliminating simple causes. Very often Samsung refrigerator it does not turn off due to the fact that it cannot reach the set temperature due to the fault of the user himself. Check that the doors fit tightly to the cabinet. If the sealing rubber is dirty, damaged or deformed, cold air will escape, causing the motor to work non-stop.
Also pay attention to the location of the unit. If refrigerator stands close to a wall or in a niche without gaps for ventilation, heat transfer is disrupted. The compressor overheats and cannot effectively cool the chamber. Make sure that there are no heat sources nearby, such as radiators or stoves, and that the equipment is not exposed to direct sunlight.
An important point is the temperature in the room. If the room is too hot (above +30°C) or, conversely, too cold (below +16°C), smart electronics may malfunction or not cope with changes. In such conditions, the sensors may transmit incorrect signals to the control board, requiring constant operation of the compressor.
⚠️ Attention: Never install the refrigerator near heating devices or in direct sunlight. This creates a critical load on the cooling system, which no compressor, even the most modern, can withstand.
How to properly check the tightness of the door?
Take a sheet of paper and clamp it with the refrigerator door. If the sheet pulls out easily and without resistance, it means that the seal does not fit tightly. Walk around the entire perimeter of the door. In places where there is a loose fit, the cold will go away, forcing the motor to work continuously.
Faults in the defrosting system and ice freezingOne of the most common reasons why Samsung refrigerator does not turn off is the formation of a “fur coat” or ice crust on the evaporator. In models with the No Frost system and drip defrosting, a special heating element (heating element) is responsible for removing excess moisture. If it burns out, the ice does not melt, building up in layers and blocking the circulation of cold air.
As a result, the temperature sensor cannot take the correct readings, since it is “walled up” in the ice, or the cold simply does not reach the food. The motor continues to hum, trying to cool the chamber, but the effectiveness of this process is zero. Visually, this may appear as snow on the back wall or in the freezer, as well as puddles of water under the unit.
Diagnosing this problem often requires partial disassembly of the back wall of the freezer. It is necessary to check the integrity Evaporator heating element, serviceability of the defrost sensor and timer (or the control module that issues the defrost command). If at least one element of the circuit fails, the defrosting cycle will not start.
Why does ice interfere with the operation of the sensor?
Ice has excellent thermal insulation. If the temperature sensor is covered with ice, it shows that the chamber is warm, even if it is already freezing outside. The electronics receive a false signal and causes the compressor to work without stopping.
Refrigerant leakage and problems with the compressorIf there are no visual signs of icing, and the doors close tightly, the problem may lie in the “circulatory system” of the refrigerator itself - the freon circulation circuit. A refrigerant leak is a serious malfunction in which gas evaporates through microcracks in pipes or solder joints. The pressure in the system drops, and the compressor is forced to work around the clock to compensate for the lack of cooling capacity.
Often, when there is a freon leak, the compressor becomes very hot to the touch, and the refrigerator stops freezing, although it continues to hum. In some cases, you can hear a characteristic hissing or gurgling sound, but more often the process is quiet. It is almost impossible to determine the exact location of the leak without special equipment (leak detector).
Another reason for constant operation is wear of the compressor itself. Over time, the piston group wears out, compression drops, and the unit is physically unable to create the necessary pressure for a normal cooling cycle. It operates at maximum capacity, but does not turn off because the target temperature has not been reached.
⚠️ Attention: If you suspect a freon leak, do not under any circumstances attempt to solder the pipes or add refrigerant yourself. This requires a license, special equipment and skills. Incorrect refueling can permanently damage the compressor.
Failure of the thermostat and temperature sensorsThe motor in refrigerators is switched on and off thermostat (in mechanical models) or an electronic temperature sensor (in models with a display). If this element fails, it stops sending a “stop” signal to the compressor, even when the chamber has already reached ideal cold. The unit continues to work, which leads to deep freezing of food and icing.
In modern Samsung refrigerators electronically controlled sensors located in different zones often break down: in the freezer, in the refrigerator compartment, on the evaporator. The electronic module can perceive an open sensor circuit as a signal that the temperature is too high and turn on the motor in emergency mode.
Diagnostics of the thermostat in mechanical models is simple: it can be “bridged” directly. If after this the refrigerator works normally (it turns on and off), then the problem is with the thermostat. In electronic models, you will need to test the sensors with a multimeter and compare their resistance with reference values for a specific temperature.
Stuck start relay and problems with the control boardThe start relay is a small black box attached to the compressor. It is responsible for starting the engine and protecting it from overloads. If the contacts inside the relay stick in the closed position, the electrical circuit is not broken and current continues to flow to the compressor windings. As a result, engine hums continuously, even if it should be resting.
In models with an inverter compressor, the role of a relay is performed by a complex electronic control unit. If triacs or other elements that control the operation of the motor burn out in the control board, it can also go into constant operation mode. This is often accompanied by errors on the display or blinking indicators.
Replacing the start relay is a simple and inexpensive procedure that you can do yourself if you have basic skills. However, diagnosing the control board requires in-depth knowledge of electronics and circuit design. If you are not confident in your abilities, it is better to entrust this stage to professionals.
Diagnostics and step-by-step instructions for eliminationTo systematize troubleshooting, use the following algorithm of actions. Do not rush to disassemble the unit, start with simple steps.
☑️ Primary diagnostics of the refrigerator
If simple measures do not help, proceed to a more in-depth diagnosis. You may need a multimeter to check electrical circuits.
1. Checking the thermostat: Unplug the refrigerator. Locate the thermostat (usually under the plastic cover inside the chamber or at the back of the unit). Remove the wires from it and connect them directly (being careful). Turn on the refrigerator. If it works and starts cycling on/off (assuming you control the temperature), then the thermostat is faulty.
2. Checking the relay: Remove the start relay from the compressor. Shake it. If a ringing or knocking sound is heard inside, it means the mechanism is damaged and requires replacement. Visually inspect the contacts for carbon deposits.
3. Analysis of the compressor operation: If the compressor is hot, but does not start or hums without trying to start, the problem may be in the motor itself or the starting winding.
Table of symptoms and probable reasonsFor ease of diagnosis, the main symptoms and the corresponding malfunctions are summarized in a table. This will help you quickly navigate the nature of the breakdown.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The refrigerator hums, but does not freeze | Freon leak or capillary blockage | High (requires a technician) |
| The compressor is hot, runs without stopping | Thermostat or sensor malfunction | Medium (you can do it yourself) |
| Heavy icing of the rear wall | Malfunction of the defrost system (heating element, timer) | Medium (requires disassembly) |
| The motor hums, clicks, but does not starts | Sticky start relay or compressor wedge | Low/High |
| The refrigerator freezes too much | Sticking thermostat contacts | Low |
When you need to call a technician and preventive maintenanceDespite the desire to save money, there are situations when self-repair is dangerous or impractical. If the problem is related to a sealed circuit (freon leakage), replacement of the compressor or complex electronics of the control board, it is better to contact a certified service center Samsung. Our technicians have the necessary equipment to evacuate the system, accurately charge refrigerant and diagnose electronic units.
In addition, if your refrigerator is under warranty, any independent repair will lead to loss of warranty. Opening seals or breaking factory connections is a direct path to denial of free service.
To prevent such situations in the future, follow the rules of prevention:
- 🧊 Defrost the refrigerator regularly (even No Frost systems require preventive maintenance once a year).
- 🧹 Keep the condenser clean (grids at the back), remove dust and animal hair.
- 🚪 Do not leave the door open for a long time and check the tightness of the seal.
- ⚡ Use a voltage stabilizer if there are power surges in your network.
⚠️ Attention: Specifications and parts locations may vary depending on the specific Samsung refrigerator model. Before starting work, be sure to check the user manual or technical documentation for your modification.
Frequently asked questions (FAQ)
Can does the refrigerator turn off due to the heat in the room?
Yes, if the room temperature exceeds +30...+35°C, it is extremely difficult for the refrigerator to reach the desired temperature. The compressor will work almost without interruption, trying to compensate for heat inflows. In such conditions, it is recommended to provide additional ventilation or reduce the temperature in the room.
How long should the compressor normally operate?
In normal operation, the cycle is approximately 15-20 minutes of operation and 20-30 minutes of rest. The work efficiency usually does not exceed 40-50%. If the refrigerator works for 40 minutes and rests for 10, this is already a sign of overload or malfunction.
Is it dangerous to leave a working refrigerator overnight?
If the refrigerator is working, no. But if it hums constantly due to a breakdown (for example, a relay is stuck or freon is leaking), this creates a risk of overheating of the wiring and fire. It is not recommended to leave such equipment unattended for a long time.
Why does the new Samsung refrigerator not turn off?
In the first 24 hours after the first turn on or after complete defrosting, the refrigerator can work without interruption, gaining temperature. This is fine. If the mode does not stabilize after a day, check the loading of the chambers (an empty refrigerator keeps the cold longer, but at the first start the difference is small) and the tightness of the doors.