The situation when the refrigerator Stinol turns on, the motor hums, the light inside is on, but the temperature in the chambers does not drop below room temperature is familiar to many owners of this equipment. This is a classic sign of poor refrigerant circulation or a control system failure. In contrast to the complete silence of the unit, a refrigerator that is working but not freezing is often misleading: it seems that since it makes noise, it means it is working. However, this noise can only be the idling of the compressor, which is not able to perform its function.
Before calling a technician or disassembling the unit, it is necessary to carry out initial diagnostics to understand the scale of the problem. Often the reason lies in trivial things, such as a loose door or broken settings, but in 80% of cases we are talking about a technical malfunction of components that requires the intervention of a specialist. Understanding the principle of operation will help you more accurately describe the symptoms to the technician or decide on independent repairs.
In this article we will go into detail Let's look at the main reasons why the refrigerator Stinol stopped freezing, and we will propose an action algorithm for each of them. It is important not to ignore the first signs of a malfunction, since prolonged operation in emergency mode can lead to failure of an expensive compressor.
Primary diagnosis: why the engine hums but there is no cold
The first thing to do when a problem is detected is to listen to the operation of the unit. If the refrigerator Stinol hums but does not freeze, this often indicates that the compressor is trying to start or is idling. In normal mode, the engine operates in an intermittent cycle: it turns on, builds up pressure, and turns off when the set temperature is reached. If the motor runs continuously or makes strange clicks, but there is no cold, the system cannot create the necessary pressure for freon to boil.
Pay attention to the nature of the sound. A dull hum may indicate a jammed piston group, and a high-frequency squeak may indicate problems with the electrical part or the starting relay. Sound diagnostics allows you to filter out a number of possible causes without opening the case. Sometimes the problem is solved by simply replacing the start-up relay, which is inexpensive and easy to change.
It is also worth checking whether the compressor itself has overheated. Carefully (so as not to get burned) touch the back wall or motor casing. If it is hot and the tubes nearby are cold, this is a sure sign that the refrigerant is not circulating through the system. In this case, further operation of the equipment may be dangerous.
⚠️ Attention: If you hear a loud bang or smell something burning, immediately unplug the refrigerator. Continuing operation may lead to a fire in the wiring or permanent failure of the compressor.
Do not forget about simple, but often ignored factors. Check whether the rubber seal fits tightly to the body. If the door does not close tightly, warm air constantly enters the chamber, and the refrigerator simply does not have time to cool it, working for wear.
Refrigerant leak: search and consequences
One of the most common reasons why a refrigerator Stinol does not freeze is a banal freon leak. The refrigerant circulates in a closed circuit, and in a healthy system its amount remains unchanged for years. However, microcracks in the evaporator, corrosion of tubes or mechanical damage can compromise the seal. When the freon evaporates, the compressor has nothing to compress and pump, so the refrigeration capacity drops to zero.
It is almost impossible to determine the leak visually, since freon is a colorless and odorless gas. However, there are indirect signs: swelling of the wall of the refrigerator compartment (if the leak occurred in the built-in evaporator), the appearance of oily stains under the unit or on the rear grill. Finding the leak location requires special equipment, such as a leak detector or an ultraviolet lamp with dye.
If you If you suspect a leak, do not under any circumstances try to simply “fill” the refrigerator. Without eliminating the gas outlet, a new portion of freon will also evaporate in a short time. The technician must find the damage, solder it and only then refuel.
Is it possible to refuel the refrigerator yourself?
Independent refueling is possible only if you have professional equipment (vacuum pump, pressure gauge station, scales) and the skills to work with them. An attempt to refill “by eye” from a spray can will lead to incorrect dosage, mixing of oil and freon, which is guaranteed to damage the compressor. In addition, different Stinol models require different types of refrigerant (R600a, R134a), and a mistake in choosing a substance is unacceptable.
It is important to understand that modern models Stinol often use isobutane (R600a), which is explosive at high concentrations. Therefore, work to eliminate leaks should be carried out in a well-ventilated area in compliance with all fire safety measures.
Compressor malfunction: symptoms and check
The compressor is the heart of the refrigerator, and if it fails, the unit stops freezing. Refrigerators often had reliable Italian motors, but they also tend to wear out. The main symptoms of a compressor malfunction include the inability to start (only a hum and a click can be heard), operation without shutting down, or, conversely, instant shutdown after switching on. Stinol reliable Italian engines were often installed Aspera or Embraco, but they also tend to wear out. The main symptoms of a compressor malfunction include the inability to start (only a hum and a click can be heard), operation without shutting off, or, conversely, instantaneous shutdown after switching on.
Checking the compressor begins by measuring the resistance of the windings using a multimeter. Normal resistance values for different windings (starting and operating) are indicated in the technical documentation. If the device shows an open circuit (infinity) or a short circuit (zero or close to zero value), the engine requires replacement. The breakdown of the housing is also checked.
Sometimes the compressor is electrically functional, but has a mechanical defect - loss of compression. The pistons can wear out so much that they no longer create a pressure difference. In this case, the refrigerator is humming, the tubes may be warm, but there is no gas circulation in the system. Replacing the compressor - a complex process that requires soldering copper tubes, evacuating the system and accurately filling the refrigerant.
It is worth noting that replacing the compressor is often not economically feasible for older models of refrigerators, since the cost of work and a new unit can be up to 70% of the price of a new unit.
Problems with the thermostat and temperature sensors
If the refrigerator Stinol works, but does not freeze, the reason may lie in the “brains” of the control system - a thermostat or an electronic sensor. A mechanical thermostat is a simple design with a capillary tube that responds to changes in temperature. If it is faulty, it may not give a command to turn on the compressor or, conversely, not turn it off, but in the context of our topic, the first option is more important: the motor does not start or starts rarely.
In models with electronic control (No Frost), sensors (thermistors) are responsible for the temperature. Their resistance changes depending on temperature. If the sensor “lies” and shows the controller that the chamber is already -30°C, although it is +20°C, the refrigerator simply will not turn on for cooling. The sensors are checked by testing them with a multimeter at different temperatures.
Often owners are faced with a situation where the thermostat requires adjustment. On older models Stinol there is a calibration screw under the temperature control knob. Inept rotation can throw off the settings, and the refrigerator will stop turning off or on at the right moments.
☑️ Checking the thermostat
For accurate diagnostics of the electronic control unit, it may be necessary to connect to the service mode. In some models Stinol this is done by a combination of buttons on the control panel, which allows you to see error codes or current sensor readings in real time.
Clogged capillary tube and filter drier
Refrigerant circulation system in the refrigerator Stinol has very narrow sections - a capillary tube and a filter drier. Over time, oil breakdown products or moisture can become trapped in the system, leading to ice blockage or particulate blockage. As a result, freon cannot circulate freely: it is compressed by the compressor to high pressure before the blockage, but does not enter the evaporator, where it should boil and cool.
A characteristic sign of a blockage is that the condenser (grid at the back) is hot only at the beginning, and then cold, or the entire back wall is hot, but warm inside. The filter drier should normally be warm, but if it is covered with frost or, conversely, an ice crust, this is a sure sign of a problem. Cleaning the system is a procedure available only in service conditions.
Masters often use the method of purging the system with nitrogen under high pressure to remove clog. If this does not help, the filter and possibly part of the capillary tube must be replaced. It is impossible to perform this operation independently without a nitrogen compressor and soldering skills.
| Symptom | Possible cause | Characteristic symptom |
|---|---|---|
| Humming, but not freezing | Freon leak | Compressor is hot, pipes are cold |
| Clicks and does not start | Faulty start relay | A metallic click is heard every few minutes |
| Works without stopping | Lack of refrigerant | The freezer is covered with an uneven layer of frost |
| On and off | Clogged capillary | The filter drier is covered with frost |
Failures in the No Frost system: fan and heating element
In refrigerators Stinol with a system No Frost cooling occurs due to forced circulation air. If you hear the compressor running, but no cool air is flowing into the chambers, the fan may be faulty. It may jam due to freezing or bearing failure. Without a working fan, the cold remains in the freezer and does not enter the refrigerator compartment.
Another common problem is a malfunction of the defrost system. If the defrost heating element or defrost sensor (defrost timer) does not work, the evaporator becomes overgrown with ice. Ice blocks the air channels, and cold air physically cannot pass into the chamber. Visually, this may appear as ice on the back wall inside the freezer or under the plastic panel.
For diagnostics, you need to defrost the refrigerator completely (at least 24 hours with the doors open). If after defrosting it starts to freeze normally, but after a couple of days the problem returns, it means that the defrosting system is not functioning. Checking the heating element is carried out by testing the resistance: if the circuit is broken, the heating element has burned out and requires replacement.
⚠️ Attention: Do not try to pick out the ice with a knife or other sharp objects. Damage to the evaporator will lead to an immediate leak of freon and expensive repairs, which are often impractical.
It is also worth checking the air duct damper between the freezer and refrigerator compartments. If it is stuck in the closed position, the cold simply does not enter the upper compartment. Mechanical jamming is often treated by lubrication or replacing the damper.
Frequently asked questions and answers (FAQ)
Why does the Stinol refrigerator freeze in only one compartment?
This is a classic sign of either a freon leak (remaining refrigerant condenses in the first section of the circuit), or capillary tube clogged. It is also possible for the air duct to freeze in No Frost systems. Diagnostics by a specialist is required.
How much does the repair cost if Stinol stops freezing?
The cost depends on the breakdown. Replacing the thermostat or relay will cost the least. Freon refilling and leak detection are more expensive. The most expensive option is to replace the compressor. The exact price can only be found out after diagnostics.
Is it possible to temporarily use a refrigerator if it does not freeze?
You cannot use it to store food, as it will spoil. However, leaving it turned on in the hope that it will “work itself” is also not worth it - this can finish off the compressor. It is better to turn it off before the technician arrives.
How can you tell that the compressor has burned out and not the relay?
If you hear a loud click when you turn it on, then the hum lasts 5-10 seconds and then click again (the protection turns off the motor) - the relay is often to blame. If the motor hums smoothly, but does not start, or is silent at all, there is likely a problem with the compressor windings or electrics.
Summing up As a result, we can say that the situation when the refrigerator Stinol works, but does not freeze, is rarely solved by simple methods such as defrosting. Most often this is a signal of a serious technical malfunction. Timely contacting professionals will allow you to preserve food and, possibly, save on repairs by preventing a chain reaction of breakdowns.