The situation when a refrigerator Stinol stops turning off is familiar to many owners of this equipment, especially considering the advanced age of most models. The compressor hums continuously, trying to reach the set temperature values, but the control system does not give the command to stop. This not only leads to a significant waste of electricity, but also creates the risk of complete failure of the motor due to overheating of the windings.
In most cases, the reason lies in a violation of heat exchange or malfunction of the sensors that “inform” the control unit that the chambers are still warm. Continuous operation of the compressor is a protective reaction of the unit to loss of cold or incorrect readings of temperature sensors. Ignoring the problem in the first hours can lead to the need for an expensive compressor replacement, so it is important to quickly identify the source of the problem.
This article will help you understand the main reasons why Stinol it hums without interruption, and understand what steps you can take yourself, and when it is better to call a technician. We will consider both trivial operating errors and complex technical breakdowns that require the intervention of professionals.
Checking the operating mode and temperature settings
Before looking for complex technical faults, you should make sure that the refrigerator is not operating in an increased mode due to external factors. Often, users accidentally activate the “Super Freeze” function or set the thermostat to maximum in hot weather. On models Stinol with electronic control, the boost cooling mode may not turn off automatically if the timer does not work correctly.
Pay attention to the environment. If the refrigerator is standing close to the wall, next to the radiator or in direct sunlight, the heat transfer efficiency drops sharply. Condenser (black grille at the back) does not have time to cool down, and the compressor is forced to work non-stop to compensate for the heat inflow. Also check the tightness of the door: if the seal is dirty or damaged, warm air constantly flows inside.
⚠️ Attention: If you have just loaded a large amount of warm food into the chamber, the refrigerator will work in enhanced mode for up to 12-24 hours. This is a normal situation, and intervention in the operation of the equipment is not required.
For models with mechanical control, you need to check the position of the thermostat knob. If it is at the maximum value (usually the number 5 or 7), and the room is hot, the unit may not be able to cope with heat inflows. Try reducing the power to an average value and monitor the cycle of operation for several hours.
Malfunctions of the thermostat and temperature sensors
One of the most common reasons for the continuous operation of old refrigerators Stinol is the failure of the thermostat. This mechanical sensor monitors the temperature of the evaporator and opens the electrical circuit when the desired cold is reached. If the contacts inside the thermostat are “stuck” in the closed position or the capillary tube has lost its seal, the compressor will receive current constantly.
In models with a system No Frost and electronic control, air sensors are responsible for the temperature. Their readings may be distorted due to oxidation of the contacts or damage to the wiring. The control unit, receiving an incorrect signal that the chamber is warm, continues to pump refrigerant. Diagnostics of such systems requires a multimeter to check the resistance of the sensor at different temperatures.
Symptoms of a malfunction of the thermoregulatory system are often accompanied by the absence of a characteristic click when trying to turn off or, conversely, complete silence of the unit during defrosting. If you notice that thermostat does not respond to turning the handle or the refrigerator does not turn on after defrosting without external influence (knocking on the sensor), it is likely to break down.
How to check a mechanical thermostat?
To check a mechanical thermostat, it can be excluded from the circuit by connecting the wires directly. If the compressor starts working after this (or starts if it was standing), then the problem is in the sensor. However, this method requires skills in working with electricity and removing the back cover of the refrigerator.
Replacing the thermostat Stinol is a relatively simple procedure, but requires precision. It is important to choose an analogue with identical parameters, otherwise the operating modes may go wrong. In electronic models, replacing the sensor often requires resetting errors in the controller memory.
Refrigerant leakage and problems with the compressor
If the refrigerator hums, but does not produce cold (or produces very little), and does not turn off, there is a high probability of a freon leak. A vacuum is created in the system, the pressure is not enough for a normal cycle, and the compressor tries to compensate for the lack of refrigerant by continuous operation. This is a critical situation, since motor-compressor it can burn out from overheating.
If there is a leak, you can often notice swelling of the side walls of the refrigerator (where the heating circuit passes around the perimeter of the door) or the appearance of oily spots under the unit. In models Stinol with a steamed evaporator, leakage may occur inside the housing, which makes repairs economically impractical. Diagnostics requires the use of a leak detector and a pressure gauge station.
Another reason is the loss of performance of the compressor itself. Over time, the valves inside the motor wear out, and it cannot create the necessary pressure to circulate freon. As a result, the refrigerator runs “idle”, trying to gain temperature, but physically cannot do this. You can check the compressor by measuring the current strength of the windings and the pressure in the system.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| The compressor is hot, there is no cold | Freon leak or clogged capillary | Call a technician to find a leak |
| The sound of flowing liquid is heard | Lack of refrigerant | Refilling and sealing the system |
| The compressor hums, but does not start | Faulty start relay | Replace the relay or check the windings |
| The refrigerator freezes, but does not turn off | Faulty thermostat | Replacing the thermostat |
It is important to understand that working with refrigerant and a sealed circuit requires a license and special equipment. An independent attempt to refuel or solder tubes without evacuation of the system will lead to rapid failure of the equipment.
Problems with the defrost system (for No Frost models)
In refrigerators Stinol with the system No Frost continuous operation of the compressor often caused by a malfunction of the defrost system. If the heating element, defrost temperature sensor or timer (or control module) does not start the evaporator defrosting process, it becomes overgrown with a “fur coat”. The air stops circulating, the temperature sensor in the chamber does not detect cold, and the compressor works without stopping.
The first sign of such a breakdown is a decrease in the performance of the refrigeration chamber with a normally operating freezer (or vice versa, depending on the design). Over time, ice may block the fan, causing you to hear a cracking or humming noise. In this case, it is necessary to completely defrost the unit (at least 24 hours) and check the elements of the defrosting system.
☑️ Diagnostics of the No Frost system
A frequent problem is the burnout of the heating element or the failure of the defrost sensor, which “thinks” that the evaporator is already warm and does not give a command to turn on the heater. In models with electronics, the alarm indicator may light up on the display, but the compressor will continue to operate, trying to cool the chamber through the ice barrier.
⚠️ Attention: Do not try to knock ice off the evaporator with sharp objects. Damage to the evaporator tubes or heating element will lead to an immediate leak of freon and expensive repairs.
Clogged capillary tube and filter drier
Another technical reason why Stinol does not turn off - this is a blockage in the refrigerant circulation system. Most often, the filter drier or the narrow part of the capillary tube becomes clogged. This can happen due to moisture entering the system, oil oxidation or decomposition products of engine oil due to overheating.
When clogged, the compressor works with increased load, trying to push freon through the obstacle. The pressure at the outlet of the compressor increases, and at the inlet it decreases. The refrigerator may freeze only where it comes out of the freezer or not freeze at all. A characteristic sign is a hot condenser only in the first part and a cold one in the second, as well as overheating of the motor itself.
To eliminate this malfunction you need:
- 🛠️ Opening the system: a technician cuts off the filter drier and checks the permeability of the capillary with nitrogen under pressure.
- 🧹 Purge the circuit: removing oxidation products and moisture from the tubes.
- 🔄 Replacement of components: install a new filter-drier and refill the system with freon.
Solve the problem yourself clogging is impossible, since evacuation of the system and precise dosage of refrigerant are required. Long-term work with a blockage is guaranteed to lead to a compressor wedge.
Environmental influences and operating rules
Do not discount external factors. If the refrigerator Stinol is installed in an unheated room in winter or in the kitchen, where the temperature drops below +10°C or rises above +32°C, its operation is disrupted. The oils in the compressor thicken in the cold, and in the heat heat transfer is impaired. The thermostat may not respond correctly to the temperature in the chamber if it is close to the ambient temperature.
It is also important to follow the placement rules. The minimum distance from the back wall to the wall should be 5–10 cm for free air circulation. If the condenser is covered with a kitchen box or covered with rags, the cooling efficiency decreases and the compressor operating time increases.
Check the integrity of the rubber seals on the doors. If it does not fit tightly, warm, moist air constantly enters the chamber. The compressor will work almost non-stop, trying to freeze out this moisture and maintain the temperature. A simple test with a sheet of paper clamped by the door will help identify weak points in the seal.
When you need to call a technician
There are a number of signs in which self-repair not only will not help, but will even worsen the situation. If you have checked the settings, defrosted the refrigerator, made sure that the condenser is clean, but compressor continues to work without interruption and does not cool (or cools weakly) - professional diagnostics are required.
It is especially dangerous to ignore the burning smell, strong heating of the motor housing (to the point where you cannot touch by hand) or the appearance of oil under the refrigerator. These symptoms indicate that a breakdown has already occurred and requires replacement of components or complex repair of the circuit.
The technician will carry out the following procedures:
- 🔍 Diagnostics: checking the pressure in the system, compressor current and serviceability of the electronics.
- 🔧 Repair: replacement thermostat, heating element, relay or restoring the tightness of the circuit.
- ⚖️ Setting: checking temperature conditions and correct operation of the automation.
⚠️ Attention: When working with the electrical components of the refrigerator, be sure to disconnect it from networks. Capacitors in starting devices can retain a charge that is dangerous to life.
Timely contacting a specialist will save money by replacing only the failed part, instead of buying a new refrigerator after the compressor burns out.
Frequently asked questions (FAQ)
Why does the Stinol refrigerator work constantly after defrosting?
If after complete defrosting (more than a day) the refrigerator does not turn off and does not It’s freezing, there’s probably a freon leak or the capillary system is clogged. If it freezes but does not turn off, the problem is in the thermostat or temperature sensor.
Is it possible to operate the refrigerator if it does not turn off?
For a short time - yes, but no more than a day. Long-term operation without stopping leads to overheating of the compressor windings, oil burnout and motor wedge. Repairs in this case will cost much more.
How to understand that the thermostat in Stinol has burned out?
If, when you turn the thermostat knob counterclockwise all the way (to the “0” or “Off” position), the compressor does not turn off and continues to hum, it means that the thermostat contacts are stuck or it is mechanically faulty.
Does the amount of food affect the operating time of the refrigerator?
Yes, a full load of food (especially warm) increases the operating time of the compressor. However, once the temperature is reached, the refrigerator should go into cycling mode. If it works constantly even with empty shelves, this is a malfunction.
What to do if the compressor is hot but there is no cold?
This is a classic sign of a refrigerant leak or compressor malfunction. You must immediately unplug the refrigerator and call a technician for diagnostics. Further activation can finish off the motor.