The situation when Samsung No Frost refrigerator stops turning off is familiar to many owners of this popular technology. Instead of the usual rhythmic hum, followed by silence, the unit begins to work non-stop, which is immediately alarming. This is not just an annoying noise, but also a signal that there has been a failure in the cooling system that requires immediate attention.
Constant operation of the compressor leads to rapid wear of expensive components and a significant increase in energy bills. If you notice that your Samsung hums without interruption, and a “fur coat” has appeared on the walls of the chamber or in the freezer, then the defrosting cycle is broken. In this article we will analyze in detail the mechanics of the process and pinpoint the main malfunctions.
Before calling a technician or disassembling the unit, it is important to understand the principle of operation of the system No Frost. Unlike drip models, here moisture does not settle on the walls, but is blown out by a fan, preventing the formation of ice. If this mechanism fails, the refrigerator goes into emergency mode of continuous operation, trying to compensate for the loss of cold.
The principle of operation of the No Frost system and shutdown cycles
To understand why compressor does not receive commands to stop, you need to understand the algorithm of operation of smart electronics Samsung. The cooling process is controlled by control module, which reads the readings of temperature sensors located in different areas of the refrigeration and freezer chambers. When the temperature reaches the set values, the controller must break the compressor power circuit.
However, the system No Frost has another critical stage - automatic defrosting of the evaporator. The heating element is turned on periodically to melt the ice on the hidden heat exchanger. If this cycle does not complete correctly or the sensors transmit distorted data, the “brain” of the refrigerator believes that the desired temperature has not yet been reached and does not give the command to rest.
A frequent cause of failures is desynchronization of readings from various sensors. For example, a sensor in the freezer may “think” that it is warm, while the temperature in the refrigerator compartment is already below freezing. Electronics Samsung in such cases often prioritizes the cooling task, ignoring other parameters, which leads to an endless cycle of engine operation.
Malfunctions of the thermostat and temperature sensors
One of the most common reasons why the refrigerator Samsung turns off, there is a failure of the thermostat or air sensors. These small elements are responsible for temperature control. If the thermostat “sticks” in the “on” position or the sensor gives a false signal about a high temperature, the compressor will work non-stop.
In modern electronically controlled models, air blowers most often fail. thermal sensors. They can oxidize, break, or simply change their resistance characteristics over time. In mechanical models, the culprit is often the thermostat itself, the capillary tube of which may have lost its seal or shifted.
How to check the sensor with a multimeter?
To check, you need to remove the sensor, connect the multimeter probes in resistance measurement mode and heat its body. The resistance should change smoothly. If the readings fluctuate or stand still, the part is faulty.
Diagnosing this problem requires care. Sometimes the sensor is simply dirty or covered with a layer of ice, causing it to incorrectly read the air temperature. In this case, it is enough to carefully defrost the camera and clean the sensor installation site to restore normal operation.
- 🔍 Visual inspection: check the integrity of the wires going to the sensors for kinks or traces of rodents.
- 🌡️ Resistance measurement: use a multimeter to compare the sensor readings with the reference values for your models Samsung.
- ❄️ Checking for ice: make sure that the sensor is not frozen into an ice crust that blocks heat transfer.
⚠️ Attention: When replacing sensors, be sure to disconnect the refrigerator from the power supply. A short circuit in the control circuit can damage the main control module, the repair of which will cost much more.
Problems with the evaporator defrosting system
The system No Frost implies that moisture does not freeze on the products, but settles on a hidden evaporator, which periodically heats up. If this mechanism is disrupted, ice begins to build up on the heat exchanger, blocking the circulation of cold air. The fan drives warm air, sensors detect the heat, and the compressor works hard, trying to cool the chamber.
The key elements here are Evaporator heating element, a timer (or electronic equivalent) and a fuse. If the heating element burns out, the ice does not melt. If the fuse is blown, the defrost circuit will not close. As a result, in a couple of days the frozen ice turns into a monolith that completely blocks the blowing channels.
☑️ Diagnostics of the defrost system
Often users do not even suspect that the problem lies precisely in the ice plug. Externally, the chamber can be clean, since the ice is hidden behind a plastic panel on the back wall. A characteristic sign of such a malfunction is a weak air flow from the holes in the rear wall of the refrigerator compartment.
To solve the problem, completely defrost the unit within 24 hours. If after this the refrigerator starts working in a normal cycle, then the problem was ice freezing. However, if the situation repeats after a week, it means that one of the elements of the defrost system (heating element or sensor) requires replacement.
Refrigerant leakage and compressor wear
If the electronics are working properly, the sensors are intact, and the ice does not freeze, but the refrigerator still does not turn off, you should think about the tightness of the circuit. Freon leak is an insidious problem. Gas can escape in microscopic portions through corrosion of tubes or poor-quality factory soldering. The pressure in the system drops, the cooling capacity decreases, and the compressor works without stopping, trying to gain temperature.
Signs of a leak are often hot side walls (the condenser heats up more than usual due to prolonged operation) and the absence of cold or weak cold in the chambers. In some cases, only partial frosting may appear on the evaporator (a “tongue” of ice), while the rest of the tubes remain dry.
Also, the reason for continuous operation can be mechanical wear of itself compressor. Over time, the piston group wears out, the valves lose their tightness, and the unit ceases to create the necessary pressure in the system. It hums, vibrates, but does not pump freon with the required efficiency, which is why the cooling cycle does not complete.
| Symptom | Probable cause | Nature of operation |
|---|---|---|
| Humming, but not cooling | Freon leak / Compressor malfunction | Constant, no cycles |
| Very freezing, does not turn off | Thermostat stuck / Sensor | Continuous to -20°C and below |
| The sound of pouring water is heard | Drainage clogged / Ice plug | Cyclic, but with overheating |
The influence of seals and operating conditions
Sometimes the reason is trivial and lies in a violation of the chamber’s tightness. If sealing rubber the door is worn out, dirty or deformed, warm air from the room constantly enters the chamber. Refrigerator Samsung reacts to this by increasing the temperature and turns on the compressor to compensate for the heat flow.
You can check the tightness with a simple test with a sheet of paper. Clamp the sheet with the door around the perimeter. If it pulls out too easily or with jerks, it means the clamping is broken. It is also worth checking whether the door itself is warped due to improper installation or overloading of the shelves.
In addition, external factors influence the frequency of switching on. Installing the refrigerator close to the wall, next to the radiator, or in direct sunlight disrupts the heat transfer of the condenser. The unit simply has nowhere to give off heat, and it is forced to work longer to cool itself and cool the food.
- 🚪 Adjusting the legs: make sure that the refrigerator is level and the door slams shut under its own weight.
- 🧼 Cleaning the seal: wipe the rubber with warm water and soap to remove grease film that prevents a tight fit.
- 📏 Gaps: leave at least 5-10 cm of free space around the case for ventilation.
⚠️ Attention: If you notice that the seal is cracked or lost elasticity, traditional methods such as oiling will give only a temporary effect. Replacing tires is the only reliable solution.
Diagnostics and algorithm for independent actions
Before panicking or looking for a service center phone number, try to carry out an initial diagnosis. Often the problem is solved without calling a technician. Start with complete defrosting: unplug Samsung refrigerator from the mains, remove the food and leave the doors open for at least 24 hours. This will help eliminate ice jams in the No Frost system.
After turning on, listen carefully to the unit. If it got hot and turned off, the problem was the ice. If it works non-stop again, check the settings in the menu (if the model is electronic). It is possible that the “Super Freeze” or “Vacation” mode was accidentally activated, which disables cyclic operation.
Hidden settings
In some Samsung models, you can enter the service menu using a combination of buttons to view errors in real time. However, it is better to do this if you know exactly your error code.
If simple methods do not help, a more in-depth check with tools will be required. You may need a multimeter to check sensors and heating elements. It is important to act consistently, eliminating one reason after another, so as not to replace a working part.
What to do if the refrigerator is humming, but not freezing?
This is a classic sign of a freon leak or a clogged capillary tube. It is impossible to fix this on your own; you need to call a technician with equipment to find leaks and refill it.
Is it possible to operate the refrigerator if it does not turn off?
It is highly not recommended. Long-term operation without stopping will lead to overheating of the compressor windings and combustion. Repairing the motor is expensive, so it is better to temporarily turn off the unit until the reasons are determined.
Why did the problem return a week later after defrosting?
This means that the defrosting system (heating element, timer or sensor) is faulty. Ice accumulated again and blocked the channels. The defective element of the No Frost system needs to be replaced.
How often should a Samsung refrigerator turn off?
In normal mode, the operating coefficient is about 30-40%. That is, for 10-15 minutes of work there should be 20-25 minutes of rest. In the summer or when fully loaded, the operating time may increase.
Does the amount of food affect the frequency of switching on?
Yes, a full refrigerator stays cold longer and switches on less often. An empty unit heats up faster from warm air when the door is opened, which makes the compressor work more often.