Failure thermostat in the refrigerator is one of the most common causes of equipment failure encountered by owners of a popular brand Stinol. This small but critical unit is responsible for maintaining the set temperature inside the chambers, turning the compressor on and off as needed. When the sensor stops reading the indicators correctly or opening the electrical circuit, the refrigerator either stops freezing or works continuously, turning food into ice blocks.
To carry out diagnosis and subsequent replacement, it is not at all necessary to call a technician if you have minimal skills in handling tools and follow safety precautions. In this article, we will analyze in detail the process of removing the thermostat, consider the features of various modifications of Stinol refrigerators and highlight key points that you should pay special attention to in order not to damage adjacent units of the unit.
Before starting disassembly, you must clearly understand that replacement is required only after confirmation of the malfunction. Often, symptoms reminiscent of a sensor failure may indicate problems with the refrigerant or compressor, so preliminary check with a multimeter would not be superfluous. If you are convinced that the problem is in the thermostat, then prepare the workplace, provide good lighting and disconnect the refrigerator from the power supply.
⚠️ Attention: Any work on repairing electrical appliances should be carried out only after completely disconnecting the device from the AC mains. Residual voltage in the capacitors can be dangerous, so let the equipment stand turned off for 10-15 minutes before starting work.
The dismantling process requires care, since in older models the plastic can be brittle, and the seals can become stiff from time to time. Improper handling of the mounts can damage the internal plastic of the camera, which will require more complex and expensive repairs. Therefore, be patient and act consistently, according to the instructions below.
The principle of operation and types of thermostats Stinol
The thermostat in refrigerators Stinol is an electromechanical device that responds to changes in the temperature of the sensitive element. Inside the body there is a sealed flask filled with gas or liquid, which is connected to a bellows. As the temperature rises, the pressure inside the system increases, straightening the bellows and opening the contacts, which leads to the compressor stopping. Design These sensors are quite reliable, but over time, wear of the mechanical parts occurs or the seal of the capillary tube is broken.
In Stinol refrigerators, like in many other models, different types of thermostats are used depending on the year of manufacture and the specific series. The most common models are marked TAM (manufactured by Danfoss/Secop) and K (manufactured by Ranco). These devices can have different lengths capillary tube, which are inserted directly into the evaporator or mounted on its surface.
- 🔹 Thermostats with a short tube (about 0.6 - 0.8 meters) are usually installed in single-chamber refrigerators or freezers with manual defrosting.
- 🔹 Sensors with a long tube (up to 2.5 meters) are typical for systems No Frost and two-chamber units, where the evaporator is located in a hidden niche.
- 🔹 There are models with an additional contact for a signal light that lights up when the temperature rises in camera.
It is important to understand that calibration the factory settings of the thermostat are made at the manufacturer, and it is not recommended to interfere with adjusting the screws on the case without special equipment. Incorrect settings can lead to cyclic activation of the compressor at short intervals, which is detrimental to the motor. It is also worth noting that in some modern models, instead of mechanical sensors, electronic thermistors can be used, the principle of operation and replacement of which is radically different.
⚠️ Attention: Do not try to repair the thermostat housing or restore the tightness of the capillary tube. This is a disposable unit that requires complete replacement in case of any malfunction.
When choosing a new spare part for Stinol it is critically important to pay attention not only to the mounting dimensions, but also to the temperature range of operation. Installing a sensor that is not suitable for its characteristics will lead to incorrect operation of the refrigerator: the food will either defrost or freeze.
What is the difference between the TAM and K thermostats?
The main difference lies in the design of the bellows and the operating temperature range. Thermostats of the K series (Ranco) often have a more compact body and differ in the location of the terminals, while TAM (Danfoss) are considered more universal and common in European technology. When replacing, it is important that the length of the capillary tube of the new sensor is no less than that of the old one, otherwise it may not be enough for installation in its normal place.
Necessary tools and preparation of the workplace
To perform high-quality work on dismantling the thermostat, you will need a standard home craftsman's kit. You should not try to replace the sensor using only a knife or screwdriver, as this increases the risk of damaging the plastic elements of the refrigerator interior. Preparing the right tool will take no more than 5 minutes, but will save you nerves and time during the disassembly process. First of all, you will need a set of various types and sizes. Stinol refrigerators use both Phillips screws (PH2) and flat slots. It is also highly advisable to have a flat-head screwdriver with a thin tip on hand to carefully snap off the plastic latches.
First of all you will need a set screwdrivers various types and sizes. Stinol refrigerators use both Phillips screws (PH2) and flat slots. It is also highly advisable to have a flat-head screwdriver with a thin blade on hand to carefully release the plastic latches.
- 🛠️ Phillips and flat-head screwdrivers (the main tool for removing panels).
- 🛠️ Pliers or pliers (for working with clamps and removing the tube).
- 🛠️ Multimeter (to check the integrity of the contacts before removal).
- 🛠️ Flashlight or headlamp (lighting inside the chamber is often insufficient).
It is additionally recommended to prepare a container for collecting melt water, if During the dismantling process, you will have to touch the elements of the defrosting system, and a rag to wipe the surfaces. If the thermostat was installed a long time ago, its contacts could oxidize, and the fastenings could “stick”, so a spray WD-40 or similar penetrating lubricant would be a good idea, although in most cases there is no need for it inside the chamber.
Organize your workspace so that the removed parts of the refrigerator are not lost or damaged. It is better to put the screws in a magnetic tray or small box, sorting them according to the stages of disassembly. This is especially true if the design uses screws of different lengths, which is typical for fastening internal panels Stinol.
Fault diagnosis before disassembly
Before you begin physically removing the thermostat, you need to make sure that the problem lies there. The symptoms of a malfunction may be similar to a breakdown of the starting relay or compressor, therefore check should be complex. If the refrigerator does not turn on at all and does not make any sounds, first check the presence of voltage in the outlet and the integrity of the power cord.
The most accurate diagnostic method is to use a multimeter in dial mode. To do this, you need to get to the thermostat terminals without completely removing it. There are usually two or three terminals on the sensor body. If you close the contacts manually (for example, with a jumper) and the refrigerator starts, it means that the compressor is working, and the circuit is broken in the thermostat.
It is also worth paying attention to the behavior of the refrigerator in various modes. If the unit operates without stopping, and an excess layer of ice forms in the chamber, and adjusting the temperature knob does not produce results, this is a sure sign of the contacts sticking in the “on” position. In this case replacement node is inevitable.
| Symptom | Probable cause | Action |
|---|---|---|
| The refrigerator does not turn on | Open circuit in the thermostat | Ring the contacts with a multimeter |
| Works without stopping | Contacts are stuck or lost tightness | Replace the thermostat |
| Frequent on/off | Incorrect calibration or freon leak | Check the system for tightness |
| No cold, but the motor buzzing | Malfunction of the compressor or relay | Diagnostics of the compressor |
If after checking it turns out that the thermostat contacts are closed (or open when cooling), but the refrigerator still does not work, the problem may be deeper. However, if your goal is a preventative replacement or you have already purchased a new part, you can proceed to dismantling. Remember that in some cases the length of the capillary tube is required if you are installing a universal analog. adjustment the length of the capillary tube if you are installing a universal analogue.
⚠️ Attention: When checking with a multimeter, make sure that the device is switched to the resistance (Ohm) or continuity measurement mode. Testing under voltage is strictly prohibited and will lead to burnout of the tester.
Removing the thermostat in refrigerators with a crying system
In classic two-chamber refrigerators Stinol with a “crying” evaporator, the thermostat is most often located inside the refrigeration chamber. It is accessed by removing the plastic panel covering the top of the rear wall or the side wall, depending on the model.
The process begins by removing the temperature control knob. It can simply pull towards itself or have a fixing screw under a decorative plug. After removing the handle, you must carefully remove the inner plastic panel. The mounting screws may be hidden under decorative plugs or seals, so carefully inspect the perimeter of the panel.
- ❄️ Remove all shelves and drawers from the refrigerator compartment for ease of access.
- ❄️ Unscrew the screws securing the top decorative strip (if any).
- ❄️ Carefully bend the latches of the plastic thermostat cover.
- ❄️ Remove the sensor housing and disconnect the terminal block.
The most delicate stage is removal capillary tube from the evaporator. It is inserted into a special socket and can be fixed with a plastic clamp or simply sit tightly in the hole. You cannot pull on the tube itself - it is very thin and can easily be pinched or burst. It is necessary to carefully loosen it, holding the metal body of the thermostat, or use pliers with soft jaws at the very entrance to the evaporator.
☑️ Dismantling checklist
After After removing the tube, unscrew the fixing screws of the thermostat itself and remove it. When installing a new sensor, proceed in reverse order, making sure that the tube enters the evaporator to the same depth as the old one. Insufficient immersion will lead to incorrect temperature readings.
Removal features in No Frost models
In refrigerators Stinol with a system No Frost the temperature regulator (or air sensor) is located differently - usually in the upper part of the refrigerator compartment, behind the plastic air duct grille, or in the control unit. The design here is more complex, since the sensor measures the temperature of the circulating air, and not the surface of the evaporator.
To access the unit, partial disassembly of the internal space is often required. It is necessary to remove the top cover of the refrigerator compartment, under which the cold air supply unit is hidden. Be careful with plastic air ducts - they are fragile and at low temperatures easily break if handled carelessly.
In such models, the thermostat is often mounted on special brackets and has a shorter capillary tube that hangs freely in the air flow or is attached to the wall of the duct. Replacement in this case, it is easier to remove the tube, but more complicated in terms of access to fasteners.
It is important not to confuse the thermostat with the defrost sensor, which is also located in the evaporator area (often in the freezer behind the rear panel). The defrost sensor has a different marking and temperature response range.
Installing a new thermostat and checking operation
Installing a new thermostat is done in the order reverse dismantling. It is critical to connect the wires to the terminals correctly. If you did not photograph the circuit, rely on the color markings or designations on the body (usually 1, 2, 4 or L, 1, 2).
When inserting the capillary tube into the evaporator, make sure that it does not have any creases or kinks. The bending radius must be smooth (at least 40-50 mm), otherwise the thin-walled tube may collapse, which will lead to depressurization of the system and failure of the new part immediately after startup.
- ✅ Insert the tube all the way (or to the mark if it was on the old part).
- ✅ Fix the tube with the standard one a clamp or a clip.
- ✅ Connect the wires, tightly fitting the terminals onto the contacts.
- ✅ Install the panel and adjustment knob.
After assembly, turn on the refrigerator. The first start may take some time as the compressor needs to build up pressure. Check the operation of the thermostat: when setting the minimum temperature, the compressor should work longer, and at the maximum it should turn off more often.
⚠️ Attention: Technical characteristics and location of components may vary slightly depending on the specific modification of the Stinol refrigerator. Always check the technical documentation of your model, if it is preserved.
If the refrigerator operates normally, gains temperature and turns off in a timely manner, the repair can be considered successful. During the first 24 hours, it is recommended to periodically check the chamber for the formation of excess ice or insufficient cooling to ensure that the thermostat is working correctly. thermostat.
How to determine that the capillary tube is not inserted deep enough?
If the tube is not inserted all the way, the thermostat will “think” that it is warmer in the chamber, than it really is. This will lead to the fact that the refrigerator will work almost non-stop, trying to reach an unattainable temperature, which will cause freezing of food and increased energy consumption.
Is it possible to use a thermostat from another manufacturer?
Yes, you can, if the overall dimensions, capillary tube length and temperature range match. For example, instead of the original Stinol, Danfoss or Ranco analogues with the appropriate parameters are often installed. The main thing is that the contacts and mounting points match.
What to do if the new thermostat knob does not fit on the rod?
Do not use force. Check whether the adjusting screw on the thermostat itself (if there is one) is fully tightened or whether the plastic stop is in the way. Sometimes it helps to slightly warm the hole in the handle with a hairdryer (carefully!) so that the plastic becomes more elastic.
Why does the refrigerator click loudly after replacing the thermostat?
The click is the normal sound of the contacts of a mechanical thermostat opening or closing. If the click is louder than usual, perhaps the new sensor has a different contact design or is not secured well enough in the seat, resonating with the body.