The situation when Samsung refrigerator stops turning off is familiar to many owners of this equipment. Normally, the unit should operate cyclically: turn on to set the temperature and turn off to rest. If the motor hums for days without a break, this is not just an annoying noise, but also a signal of a serious malfunction in the thermoregulation system or a refrigerant leak.
Constant operation of the compressor leads to its overheating and premature wear, as well as a significant increase in energy bills. Inverter models, which usually operate quieter and more economically, in the event of a breakdown, can also switch to continuous operation mode. It is important not to ignore the first symptoms in order to prevent complete failure of an expensive unit.
In this article we will analyze the main reasons why The refrigerator does not turn off, and determine which faults can be eliminated yourself, and in which cases you will need to call a specialist. Understanding the principles of operation of the No Frost system and classic drip defrosting will help you quickly diagnose the problem.
⚠️ Attention: If you smell burning or see sparking in the compressor area, immediately disconnect the device from the power supply. Further operation may lead to a fire.
Improper operation and external factors
Before you panic and look for a breakdown inside the unit, it is worth eliminating trivial errors in use. Often, users themselves create conditions under which temperature conditions is violated, forcing the equipment to wear out. For example, if you have just loaded a large amount of warm food into the chambers, the compressor will take a long time to cool the entire volume.
It is also worth checking the tightness of the door. If sealing rubber is dirty, damaged or simply does not make tight contact with the body, warm air from the kitchen constantly enters the chamber. Sensors detect the increase in temperature and command the motor to run without stopping. This is the most common reason why Samsung refrigerator it hums, but does not freeze properly.
Pay attention to the location of the unit. If it stands close to the wall or next to heating devices, heat exchange is disrupted. The radiator on the rear wall cannot effectively transfer heat, and the cooling system goes into constant struggle for degrees.
Check the thermostat settings. Perhaps one of the household members accidentally switched the regulator to Max Cool or “Super Freeze” mode. In this mode The refrigerator does not turn off forced to quickly freeze food. Usually, after a few hours or after turning off the function, the mode should return to normal.
Problems with the seal and chamber tightness
If external factors are excluded, the next probable cause is a leak. Rubber seal doors with Over time it dries out, cracks or becomes deformed. Through the resulting cracks, warm air saturated with moisture penetrates into the chamber. This leads not only to continuous operation of the compressor, but also to the formation of an ice coat.
Diagnostics can be carried out by simple visual inspection and tactile method. Run your hand along the perimeter of the door - you should not feel a stream of cold air coming out. You can also use a sheet of paper: clamp it with the door and try to pull it out. If the sheet is removed too easily in different places, it means the clamp is weakened.
- 🔍 Inspect the rubber for cracks, cuts and creases.
- 🧼 Wash the seal thoroughly with warm soapy water to remove grease and sticky residue that interferes with fit.
- 🌡️ Check whether the door has warped due to improper installation or overloading of the shelves.
In models with a system No Frost tightness is especially critical, since moisture entering the system quickly freezes on the evaporator, blocking circulation air. If the seal is physically damaged, it must be replaced. Repair in this case is ineffective.
⚠️ Attention: Do not try to lubricate the seal with oil or Vaseline to improve elasticity - this is a temporary measure that can damage the rubber structure. Use only special rubber care products or replace the part.
Failures of sensors and thermostat
One of the technical reasons why Samsung refrigerator works constantly is the failure of the temperature sensors or thermostat. These elements are responsible for controlling the climate inside the chambers. If the sensor “lies” and sends a signal to the control module that the temperature is higher than normal, the compressor will work indefinitely.
In modern models with electronic control, air sensorslocated in the upper part of the fridge compartment often break down. They can oxidize from moisture or simply burn out. In mechanical models, the problem becomes the thermostat itself, which stops opening the electrical circuit when the desired cold is reached.
To diagnose electronic systems, you can try running self-diagnosis (if the model supports such a function through a combination of buttons). Errors are often displayed on the display in the form of codes, for example 22C or 23E, which indicates a specific faulty sensor.
How to check a thermostat with a multimeter?
To check a mechanical thermostat, you need to remove it and “ring” the contacts with a multimeter. When the temperature of the thermostat pin changes (heating or cooling), the resistance should change and the contacts should open and close. If the circuit is constantly closed, the thermostat is faulty.
Replacing the sensors requires partial disassembly of the housing and, in some cases, removal of the rear panel. If you do not have the skills to work with electronics, it is better to entrust this procedure to a specialist so as not to damage the wiring or control board.
Freon leak and problems with the compressor
The most serious reason why the refrigerator does not turn off it freezes slightly is a refrigerant (freon) leak. The gas circulates in a closed loop, and if a microcrack forms in the tubes or condenser, the pressure drops. The compressor tries to compensate for the lack of cold, working at the limit of its capabilities, but does not reach the required temperature.
Signs of a leak are:
- 📉 The temperature in the chambers is higher than the set one, despite the motor running.
- 🔥 The compressor gets very hot (sometimes to the point where it is impossible to touch it).
- 🧊 Lack of cold in the freezer when the fan is running.
The second option is a malfunction of itself compressor. If its valves are worn out or compression has dropped, it will not be able to create the necessary pressure in the system. In this case, even with a full charge of freon, there will be no cold, and the engine will hum continuously. Inverter compressors with such a breakdown often emit a specific whistle or click before attempting to start.
| Symptom | Probable cause | Difficulty of repair | Need a technician |
|---|---|---|---|
| The compressor is hot, there is cold | Capillary clogged or leakage | High | Mandatory |
| The compressor is cold, does not freeze | Faulty start relay | Average | Desirable |
| Strong noise and vibration | Compressor wear | High | Required |
| Ice only on the back wall | Problems with defrosting | Average | You can do it yourself |
Restoring the refrigerant circuit requires special equipment: a vacuum pump, a pressure gauge station and freon supplies. It is almost impossible to eliminate the leak and refill the system on your own without the risk of damaging the equipment even more.
Failures in the defrost system (for No Frost)
If your Samsung is equipped with a system No Frost, continuous operation of the compressor may be caused by a failure in the system evaporator defrost. Over time, a layer of ice builds up on the hidden evaporator, blocking the air flow. The fan moves air, but it does not pass through the radiator, and the sensors record the heat.
Three main elements are responsible for the defrosting process: a heating element (heater), a defrost sensor and a timer (or electronic module). If the heating element burns out, the ice does not melt. If the defrost sensor is stuck, it does not give a command to turn on the heating. As a result, refrigerator tries to cool the chamber, but cannot because of the ice plug.
☑️ Defrost system diagnostics
To confirm this diagnosis, it is often enough to defrost the unit completely (for 24 hours with open doors). If, after switching on, it begins to behave normally (turning on and off), then the problem is precisely ice freezing. However, this is a temporary solution - the faulty unit needs to be replaced.
⚠️ Attention: Do not pick at the ice on the evaporator with sharp objects! Damage to the evaporator tubes will lead to an immediate leak of freon and costly repairs. Use only a hair dryer for gentle defrosting.
When professional repair is needed
There are a number of situations when self-repair is not only useless, but also dangerous. If you have checked the seal, defrosted the unit, made sure that the socket is working properly and the settings are correct, but Samsung refrigerator still does not turn off, most likely the problem is within the system.
A call to the technician is necessary if:
- 🛠️ The compressor needs to be replaced or the refrigerant circuit needs to be restored.
- 🔌 There is a suspicion that the electronic control module is faulty.
- 💨 A whistle or hiss is heard, indicating a gas leak.
Professional Diagnostics takes little time and allows you to accurately estimate the cost of restoration. Attempts to replace complex components without experience can lead to a simple malfunction developing into the need to replace the entire unit.
FAQ: Frequently Asked Questions
How long can a Samsung refrigerator operate without stopping in hot weather?
Under conditions of increased ambient temperature (above +30°C) or when fully loaded with warm food, the operating time may increase. However, even in summer the work cycle should not be endless. The normal mode is when the unit still pauses, albeit short. If it does not turn off for more than 12-24 hours, this is a malfunction.
Can a refrigerator stop turning off due to a power surge?
Yes, a power surge could damage the thermostat or electronic control module. In this case, the technician’s “brains” receive incorrect temperature data and keep the compressor on. Electronics diagnostics are required.
Is it dangerous to leave a refrigerator running if it does not turn off?
For a short time - no. But long-term operation (a day or more) leads to overheating of the compressor windings, melting of the insulation and a possible short circuit. In addition, food spoils due to temperature violations. It is better to turn off the power to the appliance before the technician arrives.
Why does the new Samsung refrigerator not turn off?
New models, especially with an inverter compressor, can work longer than the old ones, but they must go into low speed mode. If the new unit hums at full power without interruption during the first day, check whether the shipping bolts (if any) have been removed and whether the legs are installed correctly. If the problem persists, this is a warranty case.