A sharp increase in temperature in the refrigerator compartment or, conversely, excessive freezing of food at the rear wall often signals a failure of the climate control system. In brand models Stinol, especially in older series, the most vulnerable element is the mechanical thermostat. It is he who is responsible for turning the compressor on and off, maintaining the set temperature.
Independent replacement of this unit is a completely solvable task for a person with basic skills in working with tools and an understanding of the principles of electrical safety. However, before starting work, you must clearly understand that you are dealing with an electrical device that requires complete de-energization. Connection errors can lead to a short circuit or failure of an expensive compressor.
In this guide we will examine in detail the process of diagnosing, selecting and installing a new temperature controller. You will learn how to properly remove the old sensor without damaging the capillary tube, and how to set up a new mechanism for the correct operation of your refrigerator Stinol.
⚠️ Attention: All work on replacing electrical components should be carried out only after the refrigerator is completely disconnected from the power supply. Residual voltage in the capacitors can be dangerous, so let the equipment stand turned off for at least 15-20 minutes before starting disassembly.
Diagnostics of thermostat malfunction
Before buying a new part, you need to make sure that the problem lies in the thermostat, and not in a freon leak or a malfunction of the start relay. The first sign of a breakdown is often the continuous operation of the compressor without shutdowns, which leads to the formation of a “coat” of ice on the back wall of the chamber. In other cases, the motor may not start at all, although the light bulb is on properly.
For an initial check, you can conduct a simple test with a bypass jumper. If, with a direct connection of the contacts, the compressor starts and begins to cool, and when installing a new thermostat, the cycle operates, the diagnosis is confirmed. It is also important to inspectcapillary tube for mechanical damage, since even a microscopic crack leads to leakage of filler gas and loss of sensitivity of the sensor.
Often users confuse a breakdown of the thermostat with incorrect setting of the control knob. If your refrigerator Stinol stops freezing, try turning the knob to the maximum cold position. The lack of response of the motor or, conversely, its continuous operation with minimal settings indicates the need to replace the unit.
Preparation of tools and selection of spare parts
The success of the repair directly depends on the correctness of the selected spare part. Thermoregulators for Stinol may differ in the length of the capillary tube, the type of rod and the location of the contacts. The most common models are marked TAM-133, K-59 or RANCO. When purchasing, pay attention not only to the appearance, but also to the technical characteristics specified in the product passport.
To carry out the work, you will need a minimum set of tools, which can be found in the garage of most home craftsmen. Pay special attention to the insulation of connections, since the refrigerator has high humidity, and a bad contact can oxidize in a matter of weeks.
- 🛠️ A set of screwdrivers (phillips and flat) for dismantling panels.
- 🔧 Pliers or pliers for carefully removing the tube.
- 🔌 Electrical tape or heat shrink for insulating electrical contacts.
- 📏 Ruler or tape measure for measuring the length of the capillary tube.
⚠️ Attention: The length of the capillary tube of the new thermostat must be equal to or greater than the length of the old one. If the tube is shorter, it will not reach the evaporator, and the sensor will not work correctly, constantly keeping the compressor on.
Removing the old thermostat
The process of removing a faulty element in refrigerators Stinol begins with freeing access to the unit. Depending on the model, the thermostat may be located inside the refrigerator compartment under the lampshade or behind a decorative panel at the top. First, you need to carefully remove the regulator handle by simply pulling it towards you.
After removing the protective panel, you will see the thermostat itself with a branch extending from itcapillary tube. It is usually secured in special clamps on the evaporator. You must proceed with extreme caution: the tube is filled with gas under pressure, and damage to it will render the new thermostat unusable. Carefully bend the fixing plates and pull the tube out of the socket.
The final stage of dismantling is to disconnect the electrical wires. Before this, it is strongly recommended to photograph the connection diagram or sketch it, since the colors of the wires are in different modifications. tubes Stinol
may differ. Disconnect the terminals and remove the old sensor through the mounting hole.☑️ Check before installation
Connection diagram and installation of a new sensor
Installation of a new thermostat is carried out in the reverse order of dismantling. The key is to connect the electrical contacts correctly. Most models Stinol use a three-pin circuit, where one wire goes to the compressor, the second to the lighting lamp, and the third is grounding or a common contact.
To accurately determine the purpose of the contacts, use a multimeter in continuity mode. When turning the thermostat rod, the contacts should close and open. If you mix up the wires, the refrigerator may work, but the light will stop turning on, or, worse, there is a risk of a short circuit.
Below is a typical contact correspondence table for common models of thermostats installed in appliances Stinol. Please note that the numbering of contacts on the housing may differ.
| Contact on the thermostat | Wire color (typical) | Purpose | Cooling behavior |
|---|---|---|---|
| 3 (or L) | Red / Brown | Power input (Phase) | Always energized |
| 4 (or T) | Black / Orange | Output to compressor | Closes when heated |
| 6 (or C) | Yellow / Green | Output to lamp | Opens when the door is opened |
After connecting the wires, securely securecapillary tube in the standard clamps on the evaporator. It must fit tightly to the surface of the heat exchanger in order to correctly read the temperature. If the tube hangs in the air, the readings will be incorrect.
What to do if the wires do not match in color?
In different years of production of Stinol refrigerators, the color marking of the wires could change. If the colors do not match the table, use a multimeter to locate the phase wire and the wire going to the compressor. Grounding usually has yellow-green insulation or goes to a metal case.
Setting up and testing operation
After assembling all the panels and connecting the refrigerator to the network, do not expect instant results. It will take time for the compressor to ramp up and begin cooling. The initial adjustment of the thermostat knob is best done starting from the middle position.
During the testing process, pay attention to the engine operating cycle. It should turn on, cool the chamber to the set temperature and turn off. If the compressor operates without stopping for more than 2 hours, it may be necessary to adjust the screws on the thermostat itself, but this is a task for experienced craftsmen.
Also check the operation of the No Frost system (if it is provided by the model). If the thermostat is working properly, the defrost fan and heating element should function normally. The appearance of excessive amounts of ice in the first days may be due to residual humidity in the air of the chamber after repairs.
Typical mistakes when replacing
One of the most common mistakes is a careless attitude tocapillary tube. If it is bent at an acute angle or compressed, the permeability for the filler gas is disrupted, and the thermostat stops responding to temperature changes. The tube should lie freely, without tension.
Another common mistake is poor insulation of wire twists. In conditions of high humidity inside the refrigeration chamber, the unprotected contact quickly oxidizes, which leads to an increase in resistance and heating of the connection. This may cause a fire or repeated breakdown.
Also, users often ignore the need to defrost before repair. Trying to replace the thermostat in a refrigerator full of ice will result in water getting onto the electrical contacts or into the mounting hole, which is unacceptable.
⚠️ Attention: Refrigerator specifications may vary slightly depending on the year of manufacture and specific modification. Always check the part markings with the passport of your device or consultation at the service center before purchasing.
Frequently asked questions (FAQ)
Is it possible to use a thermostat from another manufacturer, for example, Danfoss?
Yes, you can, if the overall dimensions and capillary length are the same tubes and electrical parameters. The brand Danfoss (formerly Ranco) is one of the main suppliers for Stinol, so their products are often original or complete analogues.
Why does the refrigerator turn on immediately after defrosting, even if the food is still cold?
This may indicate incorrect installationcapillary tube. If it does not fit tightly to the evaporator, the sensor “thinks” that the chamber is warm and gives a command to turn on the compressor. Check the tube fastening.
Is it necessary to completely defrost the refrigerator before replacing?
Yes, this is a mandatory requirement. Water formed when ice melts can cause a short circuit in the wiring or get inside the new thermostat through the mounting hole, causing it to fail.
How can you tell that the thermostat is faulty if the compressor hums, but does not start?
If the compressor hums, but does not start, the problem is most often in the start relay or the compressor itself (jamming), and not in the thermostat. In this case, the thermostat simply supplies voltage, which reaches the motor. However, if there are no contacts at all, the motor is silent.