The situation when the refrigerator Stinol stops turning off or, conversely, does not want to start the compressor, often leaves the owner with a choice: call a technician or try to fix the problem yourself. In most cases, the cause of incorrect operation is a failure thermostat, which is the “brain center” of the cooling system. This small device is responsible for maintaining a given temperature regime inside the chambers, opening and closing the electrical circuit depending on the readings of the sensor.
Independent replacing the thermostat - a task that is completely solvable for a person who knows how to handle a screwdriver and a multimeter. However, the process requires care, especially when disconnecting and then connecting the wires. Incorrect switching can lead not only to a lack of cold, but also to damage to the compressor motor or start relay. Therefore, it is extremely important to clearly understand the connection diagram of your specific unit.
Before you begin dismantling the old element, you must turn off the power to the refrigerator by unplugging the plug from the socket. This is a basic safety rule, which cannot be ignored when working with electrical appliances. In this article we will analyze all stages of work, starting from diagnostics and ending with checking the functionality of the new thermostat on the refrigerator Stinol.
Diagnostics of a malfunction of the thermostat
The first sign that thermostat requires replacement is a violation temperature conditions. If the refrigerator works without interruption, turning food into ice, or is silent for days, allowing the contents to defrost, the problem most likely lies in the temperature sensor. Also, a malfunction may be indicated by the absence of a characteristic click when turning the control knob, although in some models this sound may be barely audible.
For an accurate diagnosis, it is necessary to carry out a visual inspection and an electrical test. Often, traces of carbon deposits or oxidation can be seen on the contacts of the thermostat, which indicates a poor connection. However, external integrity does not guarantee the serviceability of the internal bimetallic plate, which controls the contacts.
- 🔍 Check whether there is a reaction to turning the temperature control knob - a click should be heard.
- ❄️ Pay attention to the frost: if it is distributed unevenly or is absent at all, this is an alarming symptom.
- 🔌 Test the contacts with a multimeter in resistance measurement mode at different sensor temperatures.
- 💡 Inspect the capillary tube for mechanical damage or kinks.
If the multimeter shows infinite resistance or, conversely, a closed circuit in both positions, the part definitely requires replacement. It is also important to consider that in refrigerators Stinol with a No Frost system, the thermostat can only be responsible for one of the chambers, so the check must be localized.
⚠️ Attention: Before starting any diagnostic work, make sure that the refrigerator is completely disconnected from the power supply. Residual voltage in the circuit can lead to electric shock or damage to the tester.
Preparation for replacement and selection of tools
To successfully carry out the replacement operation thermostat on the refrigerator Stinol a minimum set of tools will be required. The main requirement for tools is serviceability and safety. You should not use damaged screwdrivers or devices with damaged insulation, since the work is carried out in limited space and proximity to electrical components.
You will need a Phillips and flat-head screwdriver to remove the panels and dismantle the regulator itself. A flat-head screwdriver can be useful for carefully prying up the plastic latches that are often found in the design of refrigerators of this brand. A multimeter is also needed for the final check of the correct connection and functionality of the circuit.
☑️ Tools for replacement
The new thermostat must be analogous to the old one. The body of the part is usually marked, for example, TAM 133, K-59 or RANCO. When purchasing, pay attention to the length of the capillary tube and the number of contacts. If you are not sure about the model, it is better to remove the old sensor and go to the store with it or take a photo of its markings.
Removing the old thermostat
The process of removing the old one thermostat on refrigerators Stinol may vary depending on the model and location of the regulator. In most cases, it is located inside the refrigerator compartment, at the top left or right, hidden under a plastic panel or directly on the adjustment knob. In some models, access to it is possible only after removing the top cover of the refrigerator.
Start by carefully removing the temperature control knob. It may be a tight fit, so be careful not to break the plastic stem. After removing the handle, access to the fastening elements or the thermostat body itself will open. If the regulator is hidden under a decorative trim, it must also be removed by unscrewing the screws or snapping the latches.
The key point is to disconnect the wires. Before cutting or unscrewing them, it is strongly recommended to photograph the connection diagram or sketch it. Wire colors may not match standard diagrams due to previous repairs or characteristics of a particular batch. The capillary tube should be removed from the mounting hole very delicately so as not to damage the thin wall.
Nuances of dismantling in different models
In some models, the Stinol thermostat is mounted on a metal plate, which, in turn, is pressed by the evaporator. In such cases, it may be necessary to partially defrost or carefully bend the elements to access the fasteners. Do not use force, the plastic on old refrigerators becomes brittle.
⚠️ Attention: The capillary tube of the thermostat is filled with refrigerant and is under pressure. Damage to the tube will lead to gas leakage and complete inoperability of the new sensor. Handle it with extreme care.
Connection diagram and wire marking
The most important stage is connecting the new one thermostat. An error in connecting even one wire can lead to the refrigerator not starting or operating in emergency mode. There is usually a wiring diagram on the thermostat housing, but it may be erased or unreadable. In this case, you should focus on the color marking and the number of contacts.
The standard thermostat for single-chamber refrigerators or for controlling the compressor in double-chamber ones has three contacts. One of them is the phase input from the network, and the other two are the output to the compressor and the output to the light bulb (or the second consumer). The fourth contact, if there is one, usually goes to ground or is used in models with electronic control.
| Contact on the thermostat | Wire color (Standard) | Purpose | Where to connect |
|---|---|---|---|
| 3 (or L) | Red / Brown | Power input | From mains / Relay |
| 4 (or 1) | Black / Orange | Output to compressor | Start relay |
| 6 (or 2) | White / Yellow | Output to lamp | Lighting lamp |
| Grounding | Yellow-green | Protection | Refrigerator body |
When connecting wires, use twisting followed by soldering or special connecting terminals. A simple twist oxidizes over time and begins to heat up, which can lead to a fire. Be sure to insulate the joints with heat-shrink tubing or high-quality electrical tape.
Installing and securing the capillary tube
After the electrical connection it is necessary to correctly secure the capillary tube of the new thermostat. The accuracy of temperature readings depends on this. The tube must be inserted into the same hole from which the old one was removed, and fixed in a special seat on the evaporator or chamber wall.
Immersion depth and tightness play a critical role. If the tube dangles in the air, the thermostat will respond to the temperature of the air in the chamber with a delay, which will lead to large temperature differences. If it is pressed too tightly or bent, a rupture is possible.
- 📏 Make sure that the tube does not have kinks or sharp bends.
- 🔩 Tightly fasten the fixing plate or clip, if provided for by the design.
- 🌡️ Make sure that the sensitive element does not touch the products or packaging.
In models Stinol with a “crying” evaporator, the end of the tube is often inserted into an aluminum sleeve or pressed with a bar against the back wall. Make sure that there is good thermal contact between the tube and the wall of the evaporator; sometimes a special heat-conducting lubricant is used for this, although this is rarely done in domestic conditions.
⚠️ Attention: The length of the capillary tube of the new thermostat may differ from the old one. Do not cut it or splice it under any circumstances. Carefully roll the excess into a ring and hide it behind the back wall of the refrigerator compartment, making sure that it does not interfere with the operation of the dampers or fans.
Checking performance and setting
After assembling all the components and returning the refrigerator to its original position, you can begin testing. Turn on the unit and set the thermostat knob to the middle position. After some time (from 10 to 40 minutes), you should hear a characteristic click of the compressor turning on. If this does not happen, check the connection diagram again.
The first cycle of operation of the refrigerator may take longer than usual, since the system needs to reach operating mode. Make sure that the compressor switches off after reaching the set temperature. If the refrigerator “threshes” without a break for more than an hour and a layer of frost has formed in the chamber, the screws on the thermostat housing may need to be adjusted.
For precise adjustment, there are two adjustment screws inside the thermostat housing. One is responsible for the temperature range (shifts the entire range up or down), and the second is responsible for the differential (the difference between turning on and off). You should turn them literally a quarter of a turn, waiting for the result after each change.
Common mistakes during self-repair
Refrigerator repair Stinol with your own hands means saving money, but the risk of making a mistake always remains. Beginners often neglect to insulate wires, believing that low voltage is safe. However, a short circuit can damage not only the thermostat, but also the starting relay or compressor windings, which will be much more expensive.
Another common mistake is incorrect positioning of the capillary tube. If it does not fit tightly to the evaporator, the refrigerator will “think” that the temperature has not yet been reached and will work continuously, causing severe freezing of the rear wall and excessive energy consumption.
It is also worth mentioning the use of inappropriate analogues. Thermostats from different manufacturers may have different on/off characteristics. Installing a “non-original” sensor without taking these parameters into account will lead to incorrect operation of the entire cooling system.
Is it possible to temporarily short-circuit the wires?
There is a method of “direct supply” to the compressor to check its serviceability. This is done by connecting the input wire and the wire going to the motor, bypassing the thermostat. This can only be done for a short time for diagnostics; leaving the refrigerator to operate without a thermostat is STRICTLY PROHIBITED - the compressor will burn out in a matter of hours.
Conclusion and recommendations for operation
Replacement thermostat on the refrigerator Stinol - procedure, requiring accuracy and understanding of the principles of operation of electrical circuits. Correct connection, reliable insulation and precise installation of the capillary tube guarantee long and stable operation of your refrigerator. If the problem persists after replacement, the problem may lie deeper - in the start relay, compressor or defrost system.
Regularly check the condition of the seals and the cleanliness of the condenser to reduce the load on the cooling system. Taking good care of your equipment and timely replacement of consumables, such as a thermostat, will extend the life of your refrigerator for many years.
Is it possible to use a thermostat from another brand of refrigerator?
The use of analogues is possible if the dimensions, capillary tube length, temperature range and contact diagram are the same. However, it is better to look for original spare parts or their direct replacements (cross codes) recommended by the manufacturer Stinol.
Why does the refrigerator turn on immediately after it is turned off?
This may indicate that the temperature differential is too small (the thermostat quickly reacts to the slightest change) or a freon leak, which is why the temperature in the chamber rises too quickly. Also, the reason may be sticking contacts.
How to determine that the problem is in the thermostat and not in the relay?
If, when the wires are connected directly, the compressor starts and works normally, but is silent without a short circuit, the thermostat is most likely faulty. If, with a direct connection, it hums but does not start or knocks out plugs, the problem is in the compressor or start relay.
Does it need to defrost the refrigerator before replacing?
Full defrosting is not necessary if access to the thermostat is in the upper part of the chamber. However, if access is required through the back wall or evaporator, defrosting for 10-12 hours is required for safety and ease of operation.