The situation when a refrigerator Zanussi works without interruption is familiar to many owners of household appliances. You may notice that the compressor is constantly humming, and it becomes too cold inside the chamber or, conversely, the products begin to deteriorate due to insufficient cooling during continuous operation. Continuous operation motor is not only an extra cost for electricity, but also a signal of a serious failure in the system.
Ignoring the problem can lead to the fact that the engine resource will be exhausted much earlier than expected, and an expensive replacement of the compressor will be required. In this article, we will analyze in detail the main reasons why Zanussi refrigerator does not turn off, and we will tell you what steps you can take yourself.
Before calling a technician, it is worth carrying out an initial diagnosis. Often the reason lies not in a breakdown, but in improper operation or external factors that can be easily eliminated.
Malfunction of the thermostat or electronic module
One of the most common reasons for continuous operation is failure thermostat. It is this sensor that commands the compressor to stop when the temperature in the chamber has reached the set value. If the thermostat contacts are stuck in the “on” position or have oxidized, the shutdown signal is simply not received.
In models with electronic control, the function of the thermostat is performed by control module. If moisture gets on the board or a power surge occurs, the module may freeze and constantly keep the compressor running. In such cases, a complete reboot of the equipment often helps.
⚠️ Attention: Before checking the electrical components, be sure to disconnect the refrigerator from the power supply. Working with live electrical wiring is life-threatening.
To check a mechanical thermostat, it is usually removed and tested with a multimeter as the temperature changes. Electronic sensors are tested for resistance, but this requires special knowledge.
How to check a thermostat without a multimeter?
If you don’t have tools, you can try gently tapping the temperature controller. Sometimes this helps to unblock stuck contacts and the refrigerator will turn off. However, this is a temporary solution.
Refrigerant leak and problems with the compressor
If there is a problem in the cooling system freon leak, the pressure drops and the refrigerator stops reaching the desired temperature. Sensors detect “heat” and command the motor to continue working, trying to compensate for the loss of cold. As a result, the compressor hums for days on end.
Signs of a leak are often:
- ❄️ Weak cooling or its complete absence in one of the chambers.
- 🔥 Hot side walls (in models with shut-off foam) or, conversely, cold condensers.
- 💧 The appearance of an ice crust only in a certain place of the evaporator.
Another possible reason is compressor wear. Over time, the piston group wears out and the engine loses its ability to create the necessary pressure. It works at the limit of its capabilities, but cannot reach the target temperature, so the shutdown cycle does not occur.
In modern models Zanussi with inverter compressors, the situation may look different: they do not turn off completely, but slow down. However, if you hear characteristic clicks or a hum that turns into silence, and then again into a hum, this is a sign of operation in emergency mode.
☑️ Diagnosis of freon leaks
Violation of the chamber seal and wear of the seal
A common and easily removable reason is door seal failure. If sealing rubber is dry, cracked or simply dirty, warm air from the room constantly penetrates into the chamber.
The refrigerator tries to cool this incoming air, and the temperature sensor does not give the command to stop the engine. You may not notice the cracks visually, but for the cooling system, even a millimeter gap is critical.
You can check the tightness in a simple way:
- Take a sheet of paper or a banknote.
- Clamp it with a door around the perimeter.
- Try to pull out the sheet. If it slides out easily and without resistance, the seal is broken.
It is also worth checking whether the door is warped hinge. If the refrigerator is not level or the door is sagging, it will not fit tightly to the body. Adjusting the hinges often solves the problem of “endless” operation.
The influence of external factors and operating mode
Sometimes the refrigerator Zanussi does not turn off due to operating conditions. If the equipment is installed next to heating radiators, a stove or under direct sunlight, heat transfer is disrupted. The compressor does not have time to cool down and cool the chamber.
It is critically important to maintain the temperature regime in the room. Most models are designed to operate at temperatures from +10°C to +32°C (climate class SN-T). If the room is hotter, the equipment will work harder.
It is also worth paying attention to the following factors:
- 🍲 Loading warm products: if you put a hot pan in the chamber, the refrigerator will work until it cools down completely.
- 🚪 Frequent opening of the door: typical for large families or stores.
- 💨 Draft: if the refrigerator is in a draft, this can knock down the temperature sensors.
⚠️ Attention: Do not install the refrigerator close to the wall. For normal air circulation around the condenser (grid at the back), it is necessary to leave a gap of at least 5-7 cm.
Check whether the mode "Super Freeze" (Super Freeze) is turned on. In this mode, the compressor runs continuously, ignoring the thermostat, to quickly freeze food. Usually it turns off automatically after 24-48 hours, but sometimes the button needs to be pressed again to turn it off.
Failure in the No Frost and defrost system
In refrigerators with the system No Frost The reason for continuous operation is often a malfunction of the defrost system. If the defrost heating element, timer or defrost sensor fails, the evaporator becomes overgrown with ice.
An ice coat blocks the circulation of cold air. The sensor in the main chamber “does not see” the cold and keeps the compressor on. In this case, the freezer may be normal, but the refrigerator compartment may be warm.
You can diagnose the problem by defrosting the refrigerator manually:
1. Disconnect equipment from the network.2. Leave the doors open for 24 hours.
3. Turn it on and check the operation.
If, after complete defrosting, the refrigerator begins to operate in a normal cycle (turns on and off), then the problem is definitely in the defrost system. Replacement of faulty elements is required.
Diagnostic table for main faults
For convenience, we have summarized the main symptoms and probable causes in a table. This will help you quickly navigate the situation.
| Symptom | Probable cause | Difficulty of repair | Necessary actions |
|---|---|---|---|
| It hums, but does not get cold | Freon leak / Clogged | High | Call a technician, refill |
| Freezes slightly, does not turn off | Compressor wear | High | Replacement of the compressor |
| Works constantly, very cold inside | Thermostat is faulty | Medium | Replacement thermostat |
| Works without stopping, it’s warm inside | Freon leak / No Frost | High | Looking for leaks or defrosting |
| Door not adjacent | Wear of the seal | Low | Replacement or repair of the seal |
Remember that independent repair of complex components, such as a compressor or refrigerant circulation system, requires special tools and licenses.
When you need to call a specialist
If simple methods such as defrosting, checking the seal and rebooting did not help, most likely you will need professional repairs. Replacement compressor or searching for microcracks in the circuit - these are tasks for the service center.
The technician will conduct diagnostics using a pressure gauge manifold, check the current of the motor windings and the tightness of the system. An attempt to replace freon yourself or solder tubes without experience can completely damage the equipment.
You should contact the service if:
- 🛠️ You hear loud knocks or metallic clanging during operation.
- 🔌 Burning smell or melted wiring.
- 📉 The refrigerator stopped freezing after many attempts to work.
Timely repairs will extend the life of your Zanussi and save money on buying new products and electricity.
Why does the Zanussi refrigerator hum, but not turns off after defrosting?
If after 24 hours of defrosting the situation has not changed, the problem is probably not ice, but a freon leak or a compressor malfunction. The thermostat could also have failed because it “does not feel” the cold.
Is it possible to operate the refrigerator if it does not turn off?
For a short time - yes, but this will lead to excessive consumption of electricity and rapid wear of the motor. Long-term operation in this mode is dangerous due to overheating and fire.
How long should a Zanussi refrigerator normally work?
In normal mode, the refrigerator works about 30-40% of the time (about 10-15 minutes it works, 20-30 rests). In winter, the operating time may decrease, in summer it may increase.
What to do if, after replacing the thermostat, the refrigerator still does not turn off?
Perhaps the wrong thermostat is installed, the length of the capillary tube is incorrectly set, or the problem lies deeper - in the control module or freon leak.