The situation when Atlant refrigerator does not turn offis one of the most alarming for the owner of household appliances. Running the compressor constantly not only causes your energy bills to skyrocket, but also creates the risk of the engine overheating, which may require costly replacement of the unit. The owner often notices a problem when he hears the continuous hum of the motor or discovers that the temperature in the refrigerator compartment is too low, and ice has formed on the walls.
The reasons for this behavior can vary from a banal door that is not tightly closed to a complex electronics failure or a refrigerant leak. Double-chamber models single-chamber units may behave differently depending on the type of control. It is important not to panic, but to consistently check the main components to understand whether you can solve the problem yourself or whether you need to call a specialist.
In this article we will analyze the main failure scenarios, explain why motor-compressor works non-stop, and provide an algorithm of actions for diagnostics. Understanding the operating principles of No Frost systems or drip defrosting will help you quickly identify the source of the malfunction. Ignoring the symptoms can lead to complete failure of the equipment.
Primary diagnosis and external factors
Before disassembling the equipment or suspecting a serious breakdown, it is necessary to exclude external factors, which often become the cause continuous operation. Very often malfunction the problem lies in improper operation or placement conditions of the unit. If the refrigerator is installed next to heating devices, in direct sunlight or in a niche without proper ventilation, the cooling system will work hard, trying to compensate for external heat influx.
Check the tightness of the rubber seals around the perimeter of the door. If the rubber has lost its elasticity, become dirty or deformed, warm air constantly enters the chamber. Sensors detect the temperature increase and give the command to the compressor not to stop. It is also worth paying attention to whether you are loading hot products into the chamber, which is a gross operating error.
⚠️ Attention: If you notice that the rubber seal is cracked or coming away from the body, do not try to glue it with regular glue. It is necessary to replace the seal or restore it with special means, otherwise the tightness will be completely broken.
Another important aspect is the position of the thermostat. Sometimes users accidentally move the handle to Max or “Super Freeze” position, forgetting about it. In this mode Atlant refrigerator it will work continuously until you force the settings to return to the standard position. Check to see if the fast freezing mode is turned on, which is often activated by a button with an indicator.
- 🔍 Check that the door is tightly closed and whether there are any foreign objects that interfere with airtight closure.
- 🌡️ Make sure that the thermostat is not installed in extreme position of maximum power.
- ☀️ Assess the location of the refrigerator: the distance to walls and heat sources must comply with the instructions.
- 🍲 Avoid loading large quantities of warm products that require long-term cooling.
⚠️ Attention: Technical characteristics and location of sensors may vary depending on depending on the specific series and model year. Always check the official user manual for your device.
Malfunctions of the thermostat and temperature sensors
One of the most common reasons why the refrigerator does not turn offis the failure of the thermostat (thermostat). This element is responsible for closing and opening the electrical circuit of the compressor depending on the temperature inside the chamber. If the thermostat contacts are “stuck” in the closed position or it has lost sensitivity, the signal to stop the engine simply will not be received, and the unit will freeze until the emergency protection is activated or the motor burns out.
In models with electronic control, such as Atlant XM-4425 or series KSD, the thermostat function is performed by a temperature sensor (thermistor). It transmits data to the control module. If the sensor “lies” and shows that the chamber is warmer than it actually is, the “brain” of the refrigerator will keep the compressor on. Diagnostics of an electronic sensor requires a multimeter to check the resistance.
How to check a thermostat with a multimeter?
To check a mechanical thermostat, you need to remove it, immerse the sensitive tube in cold water with ice and ring the contacts. If there is no click or change in readings when cooling, the device is faulty.
Replacing the thermostat in mechanical models is a procedure that can be done with your own hands if you have basic skills. However, in refrigerators with the No Frost system, access to the sensor can be difficult, since it is often hidden behind plastic panels inside the chamber. Careless removal of the plastic can lead to breakage of the fasteners or damage to the evaporator.
- 🛠️ To replace the thermostat in mechanical models, it is often enough to remove the top cover and the lampshade.
- 📉 Electronic sensors require precise calibration or installation of an original spare part with the correct resistance rating.
- 🔌 Before any replacement of electrical components, be sure to disconnect the refrigerator from the network.
Problems with freon leakage and operation compressor
If Atlant refrigerator hums, but does not freeze or it freezes slightly, while working without interruptions, there is a high probability of refrigerant (freon) leakage. The pressure in the system is broken, and the compressor, trying to reach the set temperature, runs idle. Since the required cold is not achieved, the sensor does not give a stop command. This is one of the most serious problems, requiring the intervention of a professional with equipment for vacuuming and refilling.
Another scenario is related to the compressor itself. If the unit’s performance has decreased (wear of the piston group), it is physically unable to create the required pressure in the system during a standard cycle. The motor runs continuously, trying to compensate for its weakness, but the cooling efficiency decreases. In such cases, the compressor housing often becomes very hot, sometimes to the point that it cannot be touched.
Symptoms of a leak or loss of performance are often accompanied by a change in the sound background. You may hear gurgling, hissing, or, conversely, unnaturally quiet operation. In some cases, you can notice oily spots on the rear radiator grille - this is a sure sign of depressurization of the circuit through which the freon has escaped along with the oil.
⚠️ Attention: An independent attempt to seal the pipes or refill with freon without evacuation of the system will lead to moisture and air entering, which will cause corrosion and failure of the compressor in the shortest possible time.
Faults in the control module and start relay
In modern models of Atlant refrigerators, the electronic one is responsible for all processes. control module. If the elements responsible for switching the compressor have burned out on the board, or a software failure has occurred, the relay can constantly supply voltage to the motor. In this case, the refrigerator does not respond to temperature adjustments and continues to operate even when the food is completely frozen.
It is also worth considering the problem of the starting relay, which is located directly on the compressor. If the relay contacts are welded or the mechanism is stuck in the “on” position, the circuit will not break. This often happens after power surges. Externally, the relay may look intact, but inside the contacts may be melted.
Diagnostics of the control module requires special knowledge in electronics. Burn marks, swollen capacitors or blackening are often visible visually on the board. If you do not have the skills to solder or read electrical diagrams, it is better not to touch this unit. Replacing a module is an expensive procedure, but often the only one possible when the “brains” of a refrigerator burn out.
- ⚡ Voltage surges are the main cause of failure of starting relays and electronic boards.
- 🔥 A melted relay body or a burning smell indicates the need for immediate replacement of the part.
- 🧩 When replacing the control module, flashing or adjustment to a specific model is often required.
Failures in the defrost system (for No Frost models)
For owners of refrigerators with the system No Frost a situation where the unit does not turn off may be associated with a malfunction of the defrost system. If the defrost heating element, timer or defrost sensor fails, a “coat” of ice begins to grow on the evaporator. The air stops circulating, the temperature sensor does not see the cold and forces the compressor to work constantly, although it may be warm in the chamber.
Ice blocks the ventilation ducts, and cold air simply does not enter the main chamber. The compressor is straining, trying to cool the volume, but due to the ice plug this is impossible. Outwardly, this may manifest itself in the fact that the back wall of the freezer is covered with ice, and in the refrigerator compartment the temperature is higher than normal.
☑️ Diagnostics of the defrost system
To confirm this diagnosis, it is often necessary to completely defrost the refrigerator for 10-12 hours. If after defrosting the unit started working normally and began to turn off, then the problem lies precisely in the defrosting unit. Ignoring this problem will lead to ice reaching the compressor or fan, causing them to break down.
Table of symptoms and possible causes
For ease of diagnosis, the main symptoms and the probable malfunctions corresponding to them are summarized in a table. This will help you quickly navigate the nature of the breakdown.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| Humming, does not freeze, the condenser is cold | Freon leak or capillary blockage | High (requires a technician) |
| Works without stopping, the chamber is extremely cold | The thermostat or sensor is faulty | Medium (can yourself) |
| Buzzes, clicks, but does not start or works constantly | Start relay or compressor | Medium/High |
| Noisy, there is ice in the freezer, does not turn off | Defrost system failure (No Frost) | Medium |
| Works continuously, indicators blink | Control module malfunction | High (board replacement) |
When you need to call a specialist
Despite the desire to save money, there are situations when do-it-yourself repair is not only impractical, but also dangerous. If diagnostics indicate a freon leak, a vacuum pump, a pressure gauge station and the refrigerant itself are needed. It is almost impossible to independently find a leak in a foamed casing without equipment.
Also, calling a specialist is required when replacing a compressor. This procedure requires soldering copper tubing under a nitrogen atmosphere or using special fluxes to avoid oxidation within the system. Incorrect soldering will lead to rapid re-failure of the equipment.
If you have checked all external factors, made sure that the thermostat and relay are working, but the problem persists, most likely it is due to hidden defects in the circulation system or electronics. A professional technician will be able to carry out accurate diagnostics using current clamps and pressure gauges, which will avoid purchasing unnecessary spare parts.
Is it possible to use a refrigerator with a malfunction?
Short-term operation is possible if the compressor does not overheat critically. However, (long-term) non-stop operation reduces the engine life significantly and can lead to a fire hazard.
Frequently asked questions (FAQ)
Why does the new Atlant refrigerator work without interruption on the first day?
When first turned on or after a long defrosting, the refrigerator takes time (up to 24 hours) to cool the entire internal volume and food to the set temperature. During this period, the compressor can work almost without stopping. This is the normal mode of entering the operating cycle.
Can the refrigerator not turn off due to the heat in the room?
Yes, if the room temperature exceeds +30...+32°C, heat exchange is disrupted. The compressor is forced to work longer to remove heat. In extremely hot conditions, it may not turn off at all, working at its limit.
What to do if, after replacing the thermostat, the refrigerator still does not turn off?
Perhaps the wrong thermostat is installed (different on/off temperatures), or the problem is not in it. It is worth checking for door tightness, freon leakage or a malfunction of the start relay. There could also be a problem with the control module.
Is it dangerous if the refrigerator hums and does not turn off for several days?
This is very dangerous for the unit itself. The compressor may burn out due to overheating of the windings, and the oil in the system may become coked. This is also a risk for food: in the freezer there may be freezing, and in the refrigerator, on the contrary, spoilage due to a violation of cyclicity.
How can you understand that the compressor has burned out, and not just a relay?
If you hear a click when you turn on the network, the buzzing lasts a couple of seconds and again there is a click (protection), and the compressor itself hot - the motor may have jammed or the winding may have burned out. If it hums smoothly, but does not cool, most often the problem is in the circulation system (freon), and not in the electrics of the motor.