The situation when the refrigerator Stinol hums, the light inside the chamber is on, but the temperature does not drop below room temperature is a classic sign of a serious technical malfunction. The owner hears the familiar sound of a running motor, sees that the unit consumes electricity, but the food begins to deteriorate due to the lack of cold. This is not just a settings failure, but a signal that the cooling cycle is broken at one of the key stages.
Most often the problem lies in hidden components that are not visible during a superficial inspection. This could be a refrigerant leak, failure compressor or failure of the control system. Unlike modern electronic models, in old two-compressor Stinol-101 or Stinol-102 diagnosis often comes down to checking mechanical components and electrical circuits. Understanding the physics of the process will help you not to panic and correctly assess the scale of the disaster.
Ignoring the problem in the hope that it will “work itself” will lead to complete damage to the products and possible failure of the compressor itself due to idle operation. If you notice that the back wall is not covered with frost, but it is warm inside, you must immediately stop using it and start looking for the cause. Further actions depend on how accurately you can identify the symptom.
⚠️ Attention: If you hear a loud hum, which suddenly changes to a click and silence, and then the engine tries to start again, immediately unplug the device. This is a sign thermal stroke or jamming of the compressor, and further switching on can completely burn out the motor windings.
Diagnostics of the compressor and motor operation
The first step in identifying the reason why Stinol it does not freeze is a detailed analysis of the operation of the compressor. This unit is the “heart” of the refrigerator, responsible for circulating refrigerant through the system. If the motor runs continuously without turning off for hours, but there is no cold, this indicates that it is functioning, but does not perform its main function - creating pressure for cooling.
In normal operation, the compressor must periodically turn on and off, maintaining the set temperature. If the motor-compressor hums constantly, this may indicate a loss of tightness of the circuit or a malfunction of the thermostat, which simply does not give the command to stop. In the case of models Stinol-107 or Stinol-117, a situation often occurs when the compressor is hot to the touch, but the system does not cool.
There is also the opposite situation: the refrigerator turns on, there is a quiet hum or click, but after It shuts down for a few seconds. This may indicate that the start relay is unable to start the engine, or the compressor itself is seized. In such cases starting relay often requires replacement, since it protects the windings from overload by opening the circuit in the absence of starting.
For accurate diagnosis, you need to listen to the nature of the sound. A uniform hum without vibration of the housing indicates the operation of the electrical part, but there is no freon load. If you hear a metallic knock or strong vibration, the internal valves of the compressor may have collapsed and it is running “idle” without creating the necessary pressure in the system.
Checking the thermostat and temperature sensors
The thermostat (thermostat) is a device that reads the temperature inside the chamber and sends a command to turn on or turning off the compressor. In models Stinol with mechanical control, such as Stinol-104, this element is a capillary tube that expands or contracts depending on the heat. If the thermostat is faulty, it can constantly keep the circuit closed, forcing the motor to work without interruption, or, conversely, open, preventing the refrigerator from turning on.
In more modern models with a system No Frost or electronic control, the role of a thermostat is performed by air sensors. They transmit data to the electronic control module. If such a sensor “lies” and shows that it is already -20°C inside, the compressor simply will not receive a command to start, although in fact the chamber will be warm. Checking these elements requires using a multimeter to test the contacts.
Often owners confuse a thermostat malfunction with incorrect installation of the regulator knob. If the knob is set to the “Min” or “0” position, the refrigerator may not freeze. However, if the compressor does not respond when the handle is moved to the maximum position (Max) and a characteristic click (in mechanical models), the problem is deeper. In some cases, the contacts inside the thermostat itself oxidize, which interrupts the electrical circuit.
Mechanical thermostats are characterized by a loss of capillary sensitivity over time. The gas inside the tube evaporates and the membrane stops responding to temperature changes. As a result, the refrigerator Stinol works, but the cooling cycles do not correspond to the actual conditions in the chamber, which leads to either defrosting of food or deep freezing.
How to check a mechanical thermostat without instruments?
Unplug the refrigerator, remove control knob and reach the thermostat. Short the two wires going to it directly (with a twist or electrical tape). Plug in the refrigerator. If the compressor starts working and it gets cold, the thermostat is faulty and needs to be replaced. Do not leave the refrigerator to work with closed wires for a long time without control!
Freon leakage and violation of the tightness of the circuit
One of the most common reasons why a refrigerator Stinol stopped freezing is a banal leak of refrigerant (freon). Freon is a working fluid that circulates through the system, taking heat from the chambers and releasing it to the environment through the condenser (grid at the back). If a microscopic hole appears in the circuit, the gas gradually evaporates and the cooling efficiency drops to zero.
The leak can occur anywhere: in the foam housing, in the evaporator (inside the chamber) or in the condenser. Corrosion processes are often the cause, especially in older models where the condenser tubes are made of steel and rust from below. You can also damage the circuit mechanically during defrosting, trying to pick out the ice with a knife. In this case the tightness of the system is broken instantly, and the freon comes out completely in a short time.
Signs of a leak are: lack of cold when the compressor is running, lack of heating of the rear grille (condenser) or its uneven heating, as well as the appearance of oil at the leak site. If you notice oily stains on the floor under the refrigerator or on the back wall, this is a sure sign of depressurization. Freon itself has no odor in household concentrations, so you should not rely on the sense of smell.
Restoring tightness is a complex process that requires special equipment. The technician must find the leak, seal it, evacuate the system and charge a new amount of refrigerant. It is almost impossible to repair a leak in the foamed part of the body on your own without compromising the integrity of the thermal insulation, which often makes repairs economically unfeasible.
☑️ Signs of a freon leak
Clogged capillary tube of the system
Another technical malfunction that leads to a lack of cold when the engine is running is a clogged capillary tube. The capillary is a very thin copper tube that serves as a choke, creating a pressure difference between the condenser and the evaporator. Through it, the refrigerant enters the evaporator, where the cooling process takes place. If a plug forms in the tube, the circulation of freon stops.
Clogging can be caused by several factors. Most often, this is moisture entering the system, which at low temperatures turns into an ice plug. The cause may also be oxidation of the oil that circulates along with freon, or the ingress of debris due to poor-quality previous repairs. As a result, the compressor works, creating pressure, but freon cannot pass through the narrow cross-section of the capillary.
The symptoms of a blockage are similar to a leak: the refrigerator turns on, works, but does not freeze. However, there is a difference: the condenser (grid at the back) may be hot, since the freon is compressed by the compressor, but is not circulating. Sometimes you can hear gurgling or the noise of flowing liquid, which ends abruptly. In some cases, the tube at the site of the blockage becomes covered with frost, since throttling occurs in the wrong place.
Removing the blockage requires purging the system with nitrogen under high pressure or replacing the capillary tube. This is an operation that cannot be performed at home without a compressor, pressure gauges and skills in working with refrigeration equipment. Attempts to “break through” the blockage on your own can lead to ruptured tubes or damage to the compressor.
⚠️ Attention: If you plan to call a technician, check whether the cost of the work includes evacuation of the system. Without high-quality evacuation, the moisture remaining in the tubes will again form an ice plug after a few months, and the problem will repeat.
Malfunctions of the evaporator and the No Frost system
In refrigerators Stinol with a system No Frost (or “Crying evaporator” in some models) the evaporator hidden behind a plastic panel is responsible for cooling. Cold air is forced into the chamber by a fan. If the fan does not work, the air does not circulate, and the chamber is warm, although the evaporator may be frozen. This is a common problem when the engine hums, but there is no cold.
Another common problem is evaporator freezing. If the defrost system (heating element, defrost timer, defrost sensor) does not work correctly, a “coat” of ice builds up on the evaporator. The fan stops blowing air through the ice monolith, and the cooling of the chamber stops. Visually, this can be manifested by the bulging of the back wall in the freezer or the appearance of snow inside.
Checking the system No Frost requires partial disassembly of the freezer. It is necessary to remove the back panel and inspect the evaporator. If it is completely covered with ice and the fan is not running, then the defrost cycle is broken. Often the defrost heating element or fuse fails, which blows when the heating element overheats. In models Stinol-106 and similar this occurs quite often.
It is also worth checking the fan itself. If its blades are frozen or the motor is burned out, there will be no air circulation. Sometimes the fan works, but makes a lot of noise, which indicates wear on the bearings. In this case, it must be replaced to ensure proper heat exchange in the chambers.
Table: Comparison of symptoms of main faults
For ease of diagnosis, the main symptoms of faults are summarized in a table. Compare the behavior of your refrigerator Stinol with the described symptoms to narrow down the problem.
| Malfunction | Compressor behavior | Condenser temperature (grid) | Sound signs |
|---|---|---|---|
| Freon leak | Works constantly or for a long time | Cold or slightly warm | Noise of flowing liquid, silence |
| Clogging capillary | Works constantly | Hot (especially at the beginning) | Gurgling, then silence |
| Thermostat malfunction | Does not turn on or does not turns off | Depends on the mode | No on/off clicks |
| Compressor jammed | Buzzes for 3-5 seconds and clicks | Cold | Humming, relay clicking |
| System clogged No Frost | Works normally | Hot | No noise fan |
FAQ: Frequently asked questions
Is it possible to use a Stinol refrigerator if it does not freeze, but works?
It is strictly not recommended. If the compressor runs idle (due to a leak or blockage), it will overheat, since cooling of the windings often depends on the circulation of freon and oil. Long-term operation in this mode will lead to engine burnout, and repairs will become much more expensive. In addition, food in a warm chamber will quickly deteriorate.
How much does it cost to refill with freon after eliminating the leak?
The cost consists of finding the leak, soldering, evacuation and recharging the refrigerant. Price may vary depending on region and refrigerant type (R600a or R134a). This is usually one of the most expensive repair procedures, often amounting to 50-70% of the cost of a new refrigerator.
Why did the Stinol refrigerator start working after defrosting, but stopped working again a day later?
This is a classic symptom of a capillary tube being clogged with ice (humidity blockage). During defrosting, the ice melts and the system temporarily starts working. But when the moisture freezes again at the narrowest point of the capillary, circulation stops. Professional purging of the system and replacement of the filter-drier are required.
Is it possible to replace a compressor from Stinol with an analogue from another brand?
Yes, compressors are often installed Aspera, Danfoss or Secop. The main thing is matching the power, overall dimensions, type of refrigerant and pipe diameter. However, replacing the compressor requires a complete recharge of the system, which is a complex technical task.