A sudden loss of cold in the refrigerator compartment Stinol often becomes an unpleasant surprise, especially when food begins to melt in the freezer. In most cases, the cause of this is the failure of the thermostat, which stops sending a signal to start the compressor. Replacing this element requires not only the presence of a new part, but also the correct connection of the wires, since an error in the circuit can lead to damage to the motor or even a short circuit.
The thermostat is responsible for maintaining the set temperature inside the refrigerator compartment, opening and closing the electrical circuit depending on the readings of the sensitive element. For models Stinol-101, Stinol-102 i Stinol-103 the replacement procedure has its own technical nuances that must be taken into account for safe work. In this article, we will analyze in detail the algorithm of actions, marking of contacts and methods for checking the serviceability of a new device.
Before starting any manipulations, it is critical to follow safety precautions, since the work is carried out with electrical equipment. Disconnect the refrigerator from the mains and prepare the necessary tools: screwdrivers, a multimeter and, possibly, pliers. Correct diagnostics and careful installation will allow you to restore the unit’s functionality without calling a technician.
Diagnostics of a thermostat malfunction
Before proceeding with disassembly and replacement, you need to make sure that the problem lies in the thermostat, and not in the start relay or the compressor itself. The main sign of a malfunctioning regulator is the absence of a characteristic click when turning the temperature control knob from the extreme left position to the right. If the refrigerator is silent, but the light inside the chamber is on and the motor does not start even when the contacts are forcibly closed, this is a direct signal to check the control circuit.
For accurate diagnostics, use a multimeter in continuity mode. Remove the thermostat knob and get to the contacts. Under normal conditions at room temperature, the contacts should be closed and the device will beep. If the circuit is open and you do not hear a click when the sensitive tube cools, the part requires replacement. It is also worth inspecting the capillary tube for creases or leakage of freon from the bellows.
⚠️ Attention: If the capillary tube of the thermostat has visible damage or traces of oil, such a sensor cannot be used, since it has already lost its heat-sensitive properties and will not correctly control the operating cycles of the refrigerator.
Often users confuse a broken thermostat with a faulty start relay. To eliminate this error, listen to the sounds made by the refrigerator. A humming sound from the motor that ends abruptly with a click indicates problems with the starter or compressor. Complete silence of the unit when the lighting is on most often indicates a break in the circuit in the thermostat or supply wires.
Preparation for replacement and selection of components
For models Stinol manufactured thermostats are most often used Tam (for example, TAM-133) or K-59 from Danfoss. It is important to purchase a part with similar markings or a complete analogue recommended by the manufacturer, since the length of the capillary tube and the temperature response range may differ. An incorrectly selected sensor will lead to incorrect operation: either the food will freeze, or the temperature in the chamber will be too high.
The tools you will need are Phillips and flathead screwdrivers, side cutters or a wire stripper, as well as insulating tape or heat shrink. Prepare a well-lit work area in advance, as space behind the control panel is limited. It is also recommended to have a wiring diagram on hand if you have one, or take a photo of the connection before dismantling the old element.
Make sure that the new thermostat has completely cooled to room temperature before installation if it was stored in a cold room. Sudden temperature changes can affect the initial state of the bellows and lead to false readings immediately after installation. Check the integrity of the insulation on the wires of the new device.
☑️ Readiness to replace the thermostat
Removing the old thermostat
The process of removing the faulty element begins with dismantling plastic temperature control knob. It is usually simply removed by hand, but if the plastic has hardened, you can carefully pry it off with a flat-head screwdriver, after wrapping the tip in cloth so as not to damage the surface. After removing the handle, you will have access to the fastening screws or latches of the control panel.
In refrigerators Stinol the thermostat is often located inside the refrigerator compartment in a plastic box or behind a decorative strip under the ceiling. Unscrew the screws securing the thermostat housing and carefully remove it out. Be extremely careful with the capillary tube: it is very thin and easily breaks if handled repeatedly. Do not pull the wires, but release the tube from the grooves gradually.
When the housing is removed, it is necessary to disconnect the electrical wires. Before doing this, it is strongly recommended to photograph the connection diagram or sketch the color markings of the wires and their corresponding terminals. Typically there are three or four wires, and getting them mixed up can damage the refrigerator's electronics. Bite off the wires closer to the thermostat body, leaving enough length to connect to the new element.
⚠️ Attention: It is strictly forbidden to pull the capillary tube with force. If it is stuck in the seal or channel, carefully release it using a thin object so as not to break the tightness of the system.
After disconnecting the wires, the old thermostat can be disposed of. Clean the installation site from dust and dirt that may have accumulated during operation. Check the condition of the insulation of the refrigerator wires: if the braid is cracked, it must be restored before connecting a new device.
Connection diagram and marking of wires
The most critical step is connecting the wires of the new thermostat with the wiring of the refrigerator. In thermostats used in Stinolthe contacts are usually marked with numbers 3, 4, 6 or letters. The standard diagram implies that contact "3" is common, "4" goes to the compressor, and "6" goes to the signal lamp (if it is provided for in the design).
The color marking of the wires in different models may differ, so you need to focus specifically on the contact numbers and operation logic. The wire coming from the network is connected to the input contact, and the wire going to the compressor is connected to the output contact. If your refrigerator had a light bulb installed that lights up when the door is opened, a separate contact is allocated for it, which opens when the compressor is running.
For a reliable connection, use special connecting terminals or high-quality soldering followed by heat shrink insulation. Twists are not recommended in this case, as they can oxidize or weaken due to vibration of the compressor. Each connection must be individually insulated, even if the wires are inside the same harness.
Thermostat contact correspondence table
Contact 3 - Common input (phase from mains). Contact 4 - Output to the compressor (closes when the temperature drops). Contact 6 - Output to a compensation heater or lamp (opens when the compressor is running). In some models, pin 6 may not be used.
The following is a table of typical contact markings for common thermostat models:
| Thermostat model | Pin 1 (Input) | Pin 2 (Compressor) | Pin 3 (Lamp/Other) |
|---|---|---|---|
| TAM-133 | 3 (Common) | 4 (To motor) | 6 (To lamp) |
| K-59 | 3 (Common) | 4 (To motor) | 6 (Not used) |
| TAM-145 | 3 (General) | 4 (For motor) | 6 (For heater) |
| O (China) | 3 (L) | 4 (C) | 6 (H) |
Installing a new thermostat and installing the tube
After connecting the electrical part, it is necessary to correctly lay the capillary tube of the new thermostat. It must be located in the same channel or mount as the old one in order to accurately read the temperature in the chamber. The length of the tube must correspond to the original: if it is too long, it can be carefully twisted into a ring, but under no circumstances should it be bent at an acute angle or shortened.
Fix the thermostat body in its original place, making sure that the wires are not pinched and are not near moving parts or heating elements. The plastic box should fit tightly, without gaps, so that cold air from the chamber does not fall directly on the contacts, which could cause a false operation.
Install the adjustment knob in place. Make sure it rotates freely and has clear minimum and maximum positions. If the handle is difficult to move, check whether it is seated correctly on the regulator rod. If necessary, apply a small amount of silicone grease to the shaft, avoiding contact with electrical contacts.
Checking performance and setting
After assembling all the elements, you can plug in the refrigerator. In the first minutes of operation, listen to the sounds: a characteristic click of the compressor turning on should be heard. If the engine starts, it means that the electrical circuit is assembled correctly. Let the refrigerator run idle for 2-3 hours to evaluate the cyclical nature of its operation.
The normal mode is when the compressor runs for about 30-40 minutes, followed by a pause of 15-20 minutes. If your refrigerator runs non-stop or turns on too infrequently, you may need to adjust the screws inside the thermostat housing. However, the factory setting is usually optimal, and you should only interfere with it if you have experience and measuring instruments.
Check the temperature in the refrigerator compartment using an external thermometer. It must correspond to the set value on the regulator knob. If the actual temperature is very different from the expected one, the thermostat may be defective or incorrectly selected for this model Stinol.
⚠️ Attention: If, after replacing the thermostat, the compressor hums but does not start, immediately unplug the device. This may indicate a malfunction of the starting relay or the motor itself, which could have failed when the old sensor broke down.
During the setup process, watch for the formation of ice on the back wall of the chamber. A uniform thin layer of snow is normal for a drip defrosting system. If the ice turns into a “fur coat” or the food near the back wall freezes, try turning the thermostat knob towards lower values.
Common installation errors
One of the most common mistakes is incorrect connection of wires, when the contacts of the compressor and lamp are mixed up. In this case, the refrigerator may behave inappropriately: the light comes on when the motor is running and goes off when it turns off, or the compressor does not start at all. Always double-check the connection diagram before final assembly.
Another mistake is damage to the capillary tube during installation. Even a microscopic crack will cause sensitive gas to leak and cause the thermostat to become completely inoperable within a short time. Handle the tube carefully, without sudden movements or excessive tension. Do not use open fire or harsh chemicals to straighten it.
Also, users often forget to insulate connections properly. In conditions of high humidity inside the refrigerator compartment, poor insulation can lead to oxidation of contacts and the appearance of transition resistance, which will cause heating and eventual burnout of the wiring. Use only high-quality insulating materials.
What to do if the new thermostat clicks, but the compressor does not start?
Check the voltage at the contacts with a multimeter. If there is voltage, but the motor is silent, the problem is in the start relay or compressor windings. If there is no voltage, there is an error in connecting the thermostat wires.
Is it possible to install a thermostat from another refrigerator model on Stinol?
It is technically possible if the dimensions, length of the capillary tube and temperature range match. However, different models may have different response characteristics, which will lead to incorrect operation of the refrigerator. It is better to use original spare parts or proven analogues.
Why does the Stinol refrigerator not turn off after replacing the thermostat?
This may mean that the new thermostat is set to a lower temperature than the old one, or the sensitive tube is in poor contact with the chamber wall. A freon leak is also possible, due to which the refrigerator cannot reach the desired temperature and operates continuously.
How do you understand that the thermostat is “stuck” and needs to be changed?
If the refrigerator stops turning off and works for days, or vice versa, stops turning on completely, while the control knob turns without clicks or resistance - most likely, the contacts are inside the thermostat stuck or burnt.
Do you need to defrost the refrigerator before replacing the thermostat?
Complete defrosting is not necessary if you have access to the thermostat. However, if ice prevents you from getting to the fasteners or capillary tube, it is better to wait until it thaws so that water does not get on the electrical contacts during disassembly.
How much does it cost to replace a thermostat yourself?
The cost consists only of the price of the spare part itself, since the tool is usually available on the household. Thermostats for Stinol belong to the budget segment, which makes independent repairs economically feasible.