Owners of refrigeration equipment Pozis often face a situation when the unit ceases to correctly maintain the temperature regime, and the thermostat becomes the first suspect. If you notice that the food in the chamber either freezes through or, on the contrary, begins to deteriorate due to insufficient cold, and the compressor runs almost without interruption or too rarely, the problem may lie in the temperature sensor. Understanding where it is thermostat in the Pozis refrigeratoris a key step for self-diagnosis and subsequent repair.
The location of this important unit is not always obvious, since manufacturers can change design solutions depending on the year of manufacture of the model and its series. In some cases, the part is hidden behind a decorative panel inside the chamber, in others it is moved outside, and in modern models with electronic control it can even be replaced by an air sensor integrated into the control board. Our task is to understand these nuances so that you can accurately determine the type of device you have and where it will be installed.
Before proceeding with disassembly, you must clearly understand that working with electrical components requires compliance with safety precautions. Disconnecting the device from the network is a mandatory step, neglect of which can lead to electric shock or damage to the electronics. Next, we will look in detail at the search algorithm, signs of malfunction and the stages of replacing an element that ensures stable operation of your refrigerator.
The operating principle and types of thermostats in Pozis technology
To successfully find and replace a part, you need to understand how it works. Classic refrigerator models Pozis, especially in older series, use mechanical thermostats. They work based on the physical expansion and contraction of gas or liquid contained in a sealed capillary tube. When the temperature in the chamber rises, the substance expands, the pressure in the tube increases, and the membrane closes the electrical contacts, starting the compressor. When the set temperature is reached, the process proceeds in the reverse order.
Modern models, such as Pozis RK-139 or Smart series, are often equipped with electronic control systems. In them, the role of a mechanical switch is taken over thermal sensors (thermistors), the resistance of which varies depending on the temperature. The signal from such a sensor is sent to an electronic module, which already makes a decision about turning the motor on or off. The location of these elements is radically different from their mechanical counterparts, which is important to consider when searching.
Mechanical thermostats, as a rule, have an adjustment screw accessible to the user through a handle on the body or inside the chamber. Electronic sensors do not have manual adjustment controls in the traditional sense - adjustment is made through a digital control panel. Determining the type of device you have is the first step to success.
⚠️ Attention: In models with electronic control, an attempt to mechanically interfere with the operation of the sensor or replace it with an analogue from another model without flashing or configuring the module can lead to a complete failure of the control system.
Typical symptoms of a thermostat malfunction
Before looking for where the thermostat is located, you should make sure that the problem really lies there. Symptoms may vary, but most often they come down to a violation of the cyclic operation of the compressor. If the motor hums continuously, without turning off for days, and at the same time a “fur coat” forms in the freezer compartment, and the food in the main compartment freezes, this is a sure sign that the contacts of the thermostat are “stuck” in the closed state or the capillary tube has lost its tightness.
The opposite situation is also eloquent: the refrigerator is silent and does not respond to turns of the regulator. temperature, and it becomes warm inside. In this case, the circuit is broken, and the signal to start the engine simply does not arrive. Sometimes the malfunction manifests itself in the form of too short operating cycles, when the unit turns on and off every few minutes, without having time to reach the desired temperature.
Diagnostics can be carried out by a simple method known as “freezing”. To do this, you need to turn off the refrigerator, defrost it and remove the food. Then the thermostat (if it is mechanical and accessible) is removed, its sensitive part (capillary tube) is lowered into a container with cold water and ice, and the contacts are ringed with a tester. If the tester's beeper does not make a sound when cooling, it means the part is faulty and requires replacement.
- 🔊 The compressor works without interruption, creating constant noise and vibration.
- ❄️ In the refrigerator compartment, the products are covered with an ice crust or, conversely, defrosted.
- 🔄 The unit turns on too often (short cycle) or does not turn on at all.
- 🌡️ Turning the temperature control knob does not cause any reaction from the equipment.
Localization of the thermostat in various Pozis models
The answer to the question of where the thermostat is located in the Pozis refrigerator directly depends on the specific model. In most classic two-chamber refrigerators, such as the series Pozis RK-102 or 106, the mechanical thermostat is located inside the fridge compartment. It is usually hidden behind a plastic cover that is attached to the wall of the chamber or located in a corner under the ceiling. To get to it, it is often necessary to remove the lampshade or dismantle the decorative trim.
In some modifications, especially in single-chamber models or old Soviet versions, the switch can be placed on the outer panel of the case, and the thermostat unit itself is located behind the back wall or in a niche above the compressor. In such cases, access will require moving the refrigerator away from the wall and removing the back metal cover. The capillary tube goes inside the chamber through a special hole.
If you have a model with a system No Frost or a modern design, where there are no protruding handles or lamps inside the chamber, most likely the thermostat is replaced by an electronic sensor. Such elements can be located in a special box on one of the walls, behind the back panel inside the chamber (behind the plastic casing) or even in the evaporation unit. The exact location is always indicated in the electrical diagram, which is often pasted on the inside of the rear cover of the compressor compartment.
⚠️ Attention: The design of refrigerators may vary depending on the year of manufacture. Even within the same model (for example, RK-139), the manufacturer can change the arrangement of components in different batches. Always rely on a visual inspection and diagram of your specific unit of equipment.
Arrangement nuances in the Smart series
In Pozis Smart refrigerators, the thermostat is often integrated into the common control unit, located in the upper part of the refrigerator compartment behind the decorative panel. Access may require complete dismantling of the top cover of the internal chamber.
Instructions for dismantling and replacing the thermostat
The replacement process begins with completely de-energizing the device. After this, it is necessary to empty the refrigerator compartment of food and, if necessary, remove the shelves to provide convenient access to the rear wall. If the thermostat is inside the chamber, carefully pry off the plastic cover that hides the mechanism. It can be held on by latches or screws, which are sometimes hidden under decorative plugs.
Removing the cover, you will see the thermostat itself with the wires suitable for it and the capillary tube coming out. Before disconnecting the wires, it is strongly recommended to take a photo of the connection diagram or mark each wire with a marker so as not to mix up the contacts during assembly. Unscrew the mounting screws holding the thermostat housing and carefully remove it. The capillary tube must be pulled out of the mounting hole with care so as not to damage its thin walls.
Installation of the new element is carried out in the reverse order. It is important to ensure that the capillary tube of the new thermostat is the same length and configuration as the old one. If the tube is longer, you can carefully twist it into a ring, but in no case bend it at an acute angle or shorten it. After installing all components and checking the reliability of the contacts, you can plug in the refrigerator and monitor its operation for several hours.
☑️ Checklist before replacing the thermostat
Table of compatibility and characteristics of thermostats
When selecting a spare part, it is important to pay attention not only to the external similarity, but also to the technical parameters. Different models Pozis can be equipped with thermostats from different manufacturers, such as Tam, K-59, T-110 or Ranco. Below is a table to help you navigate the main types of parts used in refrigerators of this brand.
| Thermostat type | Marking (example) | Capillary tube length | Applicability |
|---|---|---|---|
| Mechanical | TAM 133 | 0.73 m | Single-chamber refrigerators |
| Mechanical | K-59 L1950 | 2.5 m | Two-chamber models with top camera |
| Mechanical | T-110 | 0.6 m | Freezers and chests |
| Electronic | NTC sensor | Depends on the model | Models with electronic control (Smart) |
Please note that the length of the capillary tube is a critical parameter. If you install a thermostat with a tube that is too short, it may not reach the evaporator and the refrigerator will not turn off. If the tube is too long, its excess will have to be carefully placed inside the chamber, making sure that it does not interfere with air circulation and is not pinched.
Setting and testing after replacement
After the replacement has been made, you cannot immediately load the refrigerator with food. The unit must run idle for at least 2-3 hours to reach operating temperature. At this time, you should listen to the operation of the compressor: it should turn on, work for a certain time (usually from 10 to 40 minutes depending on the load and ambient temperature) and then turn off.
If the compressor does not turn off for more than an hour, the thermostat may be set to too low a temperature or its capillary tube is not in close enough contact with the evaporator. In mechanical models, adjustment is made by rotating a screw located on the thermostat housing (often it is sealed and must be turned carefully). Turning clockwise usually increases the shutdown temperature (the unit will turn off earlier), counterclockwise turns it down.
It is also important to check the tightness of the installation. If the capillary tube passes through the chamber wall, the exit point must be carefully insulated to avoid cold leakage and condensation inside the housing. To do this, you can use polyurethane foam or a special sealant. After the final check and confirmation of stable operation, you can gradually load the products.
⚠️ Attention: If, after replacing the thermostat, the refrigerator continues to operate incorrectly (for example, it does not turn off), the problem may not be in the sensor, but in a freon leak or a compressor malfunction. In this case, further diagnostics require the participation of a specialist with pressure gauge equipment.
Frequently asked questions (FAQ)
Is it possible to temporarily close the thermostat contacts to make the refrigerator work?
Technically, you can close the wires, and the compressor will start, working continuously. However, this is an emergency measure that will lead to deep freezing of food and possible failure of the compressor due to overheating. This method can only be used for a short time to save food until a new part is purchased.
Why does the new thermostat not fit the size of the capillary tube?
Manufacturers use tubes of different lengths depending on the volume of the refrigeration chamber and the design of the evaporator. If the tube is longer, it is carefully wound into a ring inside the chamber. In short, the thermostat may not be suitable, since the sensitive element will not reach the temperature control zone, which will lead to incorrect readings.
How to distinguish an electronic sensor from a mechanical thermostat?
A mechanical thermostat has a rotary knob with numbers or divisions and makes a quiet click when the position changes. An electronic sensor is a small element (often similar to a button or a cylinder on a wire) that does not have controls, and the temperature is adjusted through the display or buttons on the refrigerator body.
Do you need to defrost the refrigerator before replacing the thermostat?
Yes, complete defrosting is required. As you work, you will have to remove plastic panels and work inside the chamber. The presence of ice and water can lead to a short circuit of electrical contacts or damage to the insulation, and will also make it difficult to access fasteners.