Owners of household appliances of the Soviet and post-Soviet period are often faced with the need to fine-tune equipment that has been in service for decades. The brand’s two-chamber models Stinol have proven themselves to be reliable “workhorses”, but their mechanical nature requires periodic human intervention for correct operation. Unlike modern digital systems, here the temperature control is carried out manually, which creates certain difficulties for those who are accustomed to automation.
The main problem faced by users of older units is the lack of accurate digital indicators on the control panel. Instead of understandable degrees Celsius, we have a scale with conventional divisions or numbers from 1 to 5. Understanding the principle of operation thermostat and knowledge of the design features of a particular model allows us to achieve the ideal balance between fresh food in the main chamber and high-quality freezing in the freezer.
In this article we will detail We will analyze the setting algorithms, consider the differences between models with a drip defrosting system and “No Frost”, and also find out how to diagnose a malfunction of the regulator. Correct setting will not only extend the service life compressor, but also ensure the safety of your products.
⚠️ Attention: Before starting any diagnostic work or replacing parts, make sure that the refrigerator is disconnected from the electrical network. Mechanical thermostats are energized, and careless handling can result in electric shock.
The principle of operation of a mechanical thermostat
The heart of the cooling system in older models Stinol is a mechanical thermostat. This device is a sealed capsule filled with gas or liquid, which is connected to a bellows. When the temperature inside the chamber rises, the gas expands, the pressure on the walls of the bellows increases, and the contacts close, launching compressor. When a given threshold is reached, the cold compresses the gas and the circuit opens.
It is important to understand that this one thermostat reacts not to the air temperature in the chamber as a whole, but to the temperature at a specific point where its sensitive tube is located. That is why the position of products near the sensor can affect the frequency of motor starts. In two-chamber models, one thermostat is usually used that controls the temperature in the refrigerator compartment, and the freezer works “in conjunction” or has its own separate control circuit, depending on the modification.
The key setting element is the regulator knob, which mechanically changes the tension of the spring inside the thermostat. By turning the handle, you change the force required to open the contacts. This means that by turning the knob toward higher values, the compressor will run longer, reaching lower temperatures before stopping.
⚠️ Note: Thermostat design may vary depending on the year of manufacture. If your model was manufactured before 2005, response characteristics may differ from later versions. It is recommended to check the parameters with the technical documentation of the specific year of manufacture.
The stability of the entire system directly depends on the serviceability seals of the doors. If the rubber has lost its elasticity and allows heat to pass through, the thermostat will constantly “see” the high temperature and keep the compressor on. In this case, no adjustment of the handle will give the desired result without first repairing the seals.
Location and interpretation of regulators in different models
In old two-chamber refrigerators Stinol (series 101, 102, 103, 104, 105, 110, 115, 116, 117, 118, 120, 122, 123, 124, 125, 126, 128, 130, 132, 133, 134, 135, 167, 169, 200, 201, 202, 205, 206, 207, 208, 210, 212, 213, 214, 215, 217, 218, 220, 221, 223, 225, 226, 228, 230, 231, 232, 234, 242, 256, 260, 261, 268, 270, 271, 273, 274, 275, 278, 279, 280, 281, 285, 286, 287, 288, 289, 290, 291, 292, 295, 296, 298, 299, 300, 301, 302, 305, 306, 308, 309, 310, 311, 312, 315, 316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, 375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387, 388, 389, 390, 391, 392, 393, 394, 395, 396, 397, 398, 399, 400) control layout may vary. Most often, the refrigerator temperature regulator is located inside, on the right wall or in the upper corner. It looks like a rotary knob with numbers.
In some modifications, especially in models with the system No Frost, there may be a separate regulator for the freezer compartment. However, in classic two-chamber “Stinolas” with a drip defrosting system (crying wall), the freezer is often adjusted either by a mode switch (super freezing) or is not regulated separately at all, working in conjunction with the main circuit.
The regulator scale is usually designated from “Min” to “Max” or numbers from 1 to 5 (sometimes up to 7). It is important to remember the golden rule: the higher the number, the lower the temperature inside the chamber. Position “0” or “Off” means complete shutdown of the refrigeration unit. The middle position (usually number 3) is considered optimal for everyday use with normal loading of products.
For models with two compressors (which is rare, but found in more modern versions of that time), each circuit has its own independent regulator. In such cases, the settings are made separately for each camera, which gives more flexibility, but requires care when setting the parameters.
Step-by-step instructions for setting the temperature
The adjustment process requires patience, since changing the position of the knob does not give an instant result. The refrigerator needs time (from 2 to 6 hours) to stabilize the temperature after each intervention. You should start setting up by clearing the chambers of food to ensure free air circulation and the accuracy of the thermometer readings if you decide to use an external measuring device.
Set the thermostat knob to the middle position. For a scale of 1-5 it will be number 3, for a scale of 1-7 it will be number 4. Let the refrigerator operate in this mode for at least 6-8 hours. During this time, do not open doors unless absolutely necessary. After this, check the temperature of the products in the middle part of the refrigerator compartment (not at the walls or on the door).
☑️ Setting algorithm
If the products in the refrigerator freeze slightly (especially vegetables at the back wall), turn the knob one division towards lower values (to "Min" or 1). If the cooling is insufficient and the milk quickly sours, move the regulator one notch towards higher values (towards “Max”). Remember that sudden changes in settings can lead to the formation of a “snow coat” on the evaporator.
For the freezer in models with one compressor, there is often no separate adjustment. The temperature there depends on the efficiency of the main circuit. If the ice is melting in the freezer and everything is frozen in the refrigerator, this may indicate a freon leak or problems with thermostatrather than an incorrect setting of the knob.
⚠️ Attention: Never set the regulator immediately to the maximum value (“Max” or 5-7) in the hope of cooling food faster. This will lead to the compressor operating without stopping, which will cause its overheating and possible failure, as well as icing of the channels.
Super Freeze mode and its effect on settings
Many older models Stinol are equipped with a Super Freeze mode switch. This mode is designed to quickly freeze large quantities of fresh food. When activated, the refrigerator thermostat is bypassed (bypassed), and the compressor operates continuously without shutting down for rest.
It is strictly forbidden to use this mode for continuous operation. It is designed for short-term use (24-48 hours). If you forget to turn off Super Freeze, all the food in the refrigerator compartment will become covered with ice, and the compressor may burn out due to overload. In some models, this mode is activated by a red button or toggle switch, which mechanically locks the thermostat contacts in the closed state.
The influence of this mode on the overall temperature in a two-chamber system is colossal. In the refrigerator compartment, the temperature can drop below -5°C, which is harmful for most foods. Therefore, after freezing fresh meat or berries, be sure to return the switch to its original position.
There is an opinion that turning on “Super Freeze” helps to “rock” the refrigerator after a long period of inactivity. This is a false misconception. For the initial start, you just need to plug in the unit and let it run for 2-3 hours on medium mode without loading food.
The myth of super freezing
Many users think that the super freezing mode saves energy by working “smarter”. In fact, this is an emergency mode of maximum power, which increases energy consumption by 2-3 times.
Diagnostics of thermostat malfunctions
You can understand that the thermostat has failed by its characteristic signs. If the refrigerator does not turn on at all, although the light is on and there is voltage in the network, the contacts inside the thermostat may have oxidized or burned out. In this case, turning the knob does not cause a characteristic click, which is usually heard when passing through the switching point.
The opposite situation: the compressor works without interruption, hums, and the temperature in the chamber drops below the permissible level, the products freeze. If the regulator knob rotates freely, without resistance, or, conversely, is stuck in one position, this is a sure sign of breakdown thermostat. Also, a malfunction is indicated by the absence of a shutdown click even with strong cooling.
Another symptom is the operating cycle is too short. The compressor turns on, runs for 2-3 minutes, turns off, stops for 2-3 minutes and turns on again. This phenomenon is called “clocking” and often indicates that the temperature-sensitive tube has lost contact with the evaporator or the sensor itself has lost calibration.
For accurate diagnostics, technicians use a multimeter, checking the resistance of the thermostat contacts at different temperatures. In domestic conditions, you can use the exclusion method: temporarily short-circuit the wires going to the thermostat (being careful!). If the refrigerator starts working and starts freezing, the problem is in the regulator. If it doesn’t work, you need to look in the starting relay or motor windings.
| Symptom | Possible cause | Action |
|---|---|---|
| The refrigerator does not turn on | Thermostat is faulty (open circuit) | Checking contacts, replacing the thermostat |
| Works without stopping | Sticking contacts or leaking freon | Pressure diagnostics, checking thermostat |
| Food in the refrigerator freezes | Sensor malfunction or super-freezing mode | Check switches, replace regulator |
| Frequent on/off | Gone calibration or the tube has come loose | Check the attachment of the tube to the evaporator |
Typical errors during operation and their consequences
One of the most common mistakes is installing the refrigerator too close to a wall or heat source. Older models Stinol often have a condenser (grid at the back), which should efficiently transfer heat. If the gap is less than 5-7 cm, heat transfer is disrupted, the compressor overheats, and the thermostat cannot turn off the unit, since the temperature inside does not drop to normal due to general overheating of the system.
Loading warm food is another “killer” of old refrigerators. If you put a pot of hot soup in the chamber, the thermostat will register a sharp jump in temperature and cause the compressor to wear out for several hours. In older units, this often led to defrosting of already frozen food in the freezer due to excessive consumption of the refrigeration capacity resource.
Ignoring defrosting also affects the operation of the thermostat. A thick layer of ice on the evaporator (even in drip systems if the drain hole is clogged) acts as a heat insulator. The temperature sensor “thinks” that the chamber is warm, although in fact there is already cold air there, but the sensor is covered with ice. This leads to incorrect operation cycles.
Users often forget that the number of products affects the inertia of the system. An empty refrigerator cools down faster, but also heats up faster when the door is opened. A fully loaded refrigerator will keep the temperature more stable, but will take longer to cool down initially. It is better to make adjustments at an average load (about 50-60% of the volume).
How often do you need to change the thermostat in Stinol?
The service life of a mechanical thermostat is on average 10-15 years. If your refrigerator is more than 20 years old, replacing the thermostat may be required at any time as a planned measure, even if there are no obvious signs of failure yet. However, if it works stably, you shouldn’t change it “just in case” - a high-quality factory part often lasts longer than modern analogues.
Is it possible to use a thermostat from another refrigerator?
Theoretically, it is possible if the parameters match (on/off temperature, tube length, type of fastening). However, for older Stinol models (especially with a gas-filled tube), it is extremely important to select an exact analogue (for example, TAM-112, TAM-133). Installing an unsuitable regulator will lead to incorrect operation: either the refrigerator will “thresh” without stopping, or it will never turn off.
Why, after adjusting the temperature in the chamber, did it become warmer and not colder?
This is a common mistake in perceiving the scale. Remember: turning the knob towards larger numbers (for example, from 2 to 4) makes the temperature INSIDE the chamber LOWER (colder). If you turned the knob to increase the number, but it became warmer, perhaps the thermostat is faulty or there is not enough freon in the system, and the compressor simply cannot cope, running idle.
What to do if the regulator knob scrolls endlessly?
If the thermostat knob rotates in a circle without clicks and without changing the operating mode, this is a sign of internal mechanism failure. Most likely, the spring has burst or the shaft has turned. In this case, adjustment is impossible; a complete replacement of the unit is required. You can operate the refrigerator in this state only if you manually (through the service menu or temporary short circuit) maintain operation, but this is unsafe and requires constant monitoring.
Does the network voltage affect the operation of the thermostat?
The mechanical thermostat itself is quite resistant to voltage drops, since it is a passive device. However, low voltage can cause the compressor to be unable to start or to operate inefficiently, creating the illusion that the thermostat is faulty (the temperature does not drop, the contacts do not open). For older Stinol models, a stable voltage in the range of 190-240 Volts is critical.