The situation when the Stinol refrigerator stops turning off or, conversely, stops freezing, often confronts the owner with a difficult choice: call a technician or try to fix the problem yourself. Thermostat is one of the key elements of the temperature control system, and its failure disrupts the normal operation of the entire unit. If you observe that the compressor is working without interruption, and the food in the chamber is freezing, or the equipment has stopped starting altogether, then with a high degree of probability the problem lies in this sensor.
Independently replacing the thermostat on the refrigerator Stinol is a very real task for a person, having basic skills in handling tools and minimal knowledge of electrical engineering. It is important to understand that we are talking about working with electric current and refrigerant, so strict adherence to safety precautions is required. In this article, we will analyze in detail the diagnostic process, selecting a new part and the procedure for installing it so that your refrigerator works like new again.
Before taking active steps, you need to make sure that you have accurately diagnosed the breakdown. Often, the symptoms of a faulty thermostat can be confused with compressor problems or a freon leak. It is critically important to disconnect the refrigerator from the power supply before starting any work, since you will be working with conductive elements. The introductory part of our guide will help you navigate the signs of a breakdown and prepare for repairs.
Diagnostics of thermostat malfunction
The first step in any repair is the correct diagnosis. Thermoregulator (or thermostat) is responsible for closing and opening the electrical circuit depending on the temperature inside the refrigerator compartment. If it is “stuck” in the “on” position, the compressor will work continuously, trying to cool the chamber to unattainable values, which will lead to freezing of the back wall and food. If the contacts are open forever, the refrigerator will simply stop cooling.
For the initial check, you can use the exclusion method. Try turning the control knob from minimum to maximum. If you hear a characteristic click, this is a good sign, but it does not guarantee that the entire system is working. A more reliable way is to check the operation of the compressor with the thermostat turned off. To do this, you will need to briefly short-circuit the wires going to the sensor, but this should be done extremely carefully and only when the power is off, supplying current only at the time of checking the engine starting.
There are several obvious signs indicating the need for replacement:
- 😐 The compressor works non-stop, the temperature in the chamber drops below -20°C.
- ❄️ The refrigerator compartment is too warm, although the compressor turns on rarely or does not start at all.
- 🔊 There is no characteristic click of the thermostat turning off when turning the knob.
- 💡 Indicator light (if it is controlled by a thermostat) lights up constantly or does not light up at all.
If you find that when you turn the adjustment knob no sounds are heard and the temperature does not change, most likely capillary tube the thermostat has lost its seal or the sensitive element itself is damaged. In Stinol models, especially older series, this is a common problem due to the natural wear and tear of materials.
Necessary tools and workplace preparation
The success of the thermostat replacement operation largely depends on proper preparation. You do not need complex professional tools, but you should have reliable and serviceable devices at hand. A set of screwdrivers (cross and flat) is necessary for removing panels and dismantling fasteners. Also, be sure to prepare side cutters or wire cutters for working with wires, as well as pliers.
Particular attention should be paid to the insulation of connections. This will require insulating tape or, more professionally, heat shrink tubing and a lighter (or hair dryer) to shrink it. Don't forget a multimeter if you plan to accurately diagnose the circuit resistance before replacing. The workplace should be well lit so that you can distinguish the colors of the wires and markings on the parts.
⚠️ Attention: Never work under voltage. Make sure that the refrigerator's plug is unplugged from the socket before touching any internal components.
For the convenience of working with Stinol refrigerators, where space is often limited, a flashlight may be useful. Also prepare a container to collect melt water if you have to defrost the evaporator, and dry rags. Cleanliness and order in the workplace will prevent the loss of small fasteners.
☑️ Preparing to replace the thermostat
Removing the old thermostat in the refrigerator compartment
The process of removing the faulty part depends on the specific model of your Stinol, but the general algorithm of actions is similar for most two-chamber refrigerators of this brand. Typically the thermostat is located inside the refrigerator compartment, often in a plastic casing along with a quick freeze button or light bulb. In some models, it may be hidden behind a decorative panel on the ceiling of the chamber.
First you need to carefully remove the temperature control knob. It's usually easy to remove by hand, but if it's tight, you can use a flathead screwdriver to pry it loose, being careful not to break the plastic. After removing the handle, you will have access to the mounting screws or latches of the thermostat housing. By unscrewing them, you can remove the control unit.
Next comes the most crucial moment - working with the wires. Before disconnecting them, it is strongly recommended to take a photo of the connection diagram or sketch the colors of the wires and their location on the terminals. Stinol refrigerators often use standard color markings, but it is better to double-check:
- 🔴 Red or orange - usually the phase going to the compressor.
- 🔵 Blue or black - neutral or ground wire (depending on the circuit).
- 🟡 Yellow with a green stripe - case grounding.
- 🟢 Green or white - wire going to the lamp or fan (in No Frost).
Having disconnected the wires, you need to carefully remove the capillary tube from its seat. It can be secured with plastic clips or simply inserted into a hole in the chamber wall. You need to pull without sharp jerks so as not to damage the tube and not to break the tightness of the system if you plan to use the old thermostat for comparison or disposal.
Features of replacement in models with the No Frost system
In Stinol refrigerators with the system No Frost the location and type of thermostats may differ. Here, not only mechanical but also electronic sensors are often used, although in older models mechanical thermostats, located in the evaporator area or in a special channel, predominate. Access to them can be difficult due to the presence of a large amount of plastic and air ducts.
To access the thermostat in a No Frost system, it is often necessary to remove the back panel inside the freezer or refrigerator compartment (depending on the design). This will require completely defrosting the unit for at least 24 hours so that the ice does not interfere with the dismantling of the plastic elements. Trying to remove a panel with ice can lead to breakage of the fragile plastic.
The table below will help you navigate the differences in designs:
| Characteristics | Mechanical thermostat | Electronic sensor | Thermostat in the duct (No Frost) |
|---|---|---|---|
| Location | Inside the chamber, on the wall | Inside the case or behind the panel | In the air duct or behind the evaporator |
| Principle of operation | Gas expansion in the capillary | Change of resistance | Air temperature control |
| Replacement | Requires connection wires | Requires precise selection of resistance | Requires disassembly of air ducts |
| Complexity | Low | Medium | High |
If your Stinol refrigerator has a thermostat with a long capillary tube going deep into the body, when installing a new one, it is important to lay this tube correctly. It should be in close contact with the cooled surface, but not have any creases. In No Frost systems, the tube is often inserted into a special sleeve, and it must be pushed all the way.
How to check a new thermostat before installation?
Before installation, a new thermostat can be checked with a multimeter in dial mode. When cold (if you put it in the freezer for 15 minutes), the contacts should open (the sound will disappear), and when heated in your hand, they should close (a squeak will appear). This ensures that the part is in good condition.
Installation of a new thermostat and connection
Installation of the new part is carried out in the reverse order of dismantling. Make sure you purchase a thermostat with similar specifications. For refrigerators Stinol temperature regulators of the TAM or K-59, K-50 series are often used. It is important that the length of the capillary tube matches the original or is slightly longer (the excess can be carefully twisted into a ring without bending).
Install the thermostat housing in its original place and secure it with screws. Insert the capillary tube into the hole until it stops. Now is the time to remember the photographs or recordings you took earlier. Connect the wires to the appropriate terminals. If the colors of the wires match, great; if not, refer to the diagram or terminal markings (L, 3, 4, 6, etc.).
Use high-quality insulation to connect the wires. Twisting of wires in refrigerators is unacceptable due to vibration and possible moisture. It is best to use soldering followed by heat shrink insulation, but if you don’t have a soldering iron, then reliable terminal blocks or high-quality electrical tape will also work. Make sure that no exposed section of the wire touches the metal parts of the case.
After connecting all communications, reinstall the plastic casing and adjustment knob. Make sure all the latches are in place and nothing is loose. Only after visually checking the correct assembly can you begin testing.
Checking functionality and setting the temperature
After installation is complete, turn on the refrigerator. In the first minutes you should hear the compressor starting. If the compressor works, this is the first sign of success. Now you need to set the correct temperature. Set the control knob to the middle position (usually number 3 or 4 on the scale).
Let the refrigerator operate for several hours without loading food. Check the temperature in the chamber periodically using a thermometer. If the refrigerator turns off when it reaches +4...+5°C and turns on when the temperature rises to +7...+8°C, it means thermostat selected and installed correctly. The operating cycles must be uniform.
Possible problems after replacement:
- 🔊 The compressor hums, but does not start - the start relay may be faulty or the problem is in the compressor itself, and not in the thermostat.
- ❄️ The refrigerator does not turn off - perhaps the capillary tube is not immersed deep enough or the thermostat is defective.
- 💡 The light is on, but there is no cold - check whether the wires are connected to the terminals correctly.
⚠️ Attention: If after replacing the thermostat the refrigerator does not work correctly (too often turns on or does not freeze), do not leave it in this state for a long time. This can lead to spoilage of products or failure of the compressor.
Frequently asked questions (FAQ)
Can I use a thermostat from another brand, for example, from Atlant or Indesit?
In most cases possible if the overall dimensions, length of the capillary tube and temperature range of operation match. However, it is better to look for original spare parts or complete analogues specifically designed for Stinolto avoid problems with installing the handle and calibration.
Why does a new thermostat click, but the refrigerator does not turn on?
A click means that the contacts inside the thermostat are closed, but this does not guarantee that the current reaches compressor. Check the integrity of the wires, the condition of the start relay and the compressor itself. Perhaps the problem is not in the thermostat, but in the electrical circuit after it.
Is it necessary to recharge the freon after replacing the thermostat?
No, when replacing the thermostat, the refrigerant circulation system does not open (unless you damage the capillary tube of the evaporator). The thermostat is an electrical device, and its replacement does not require intervention in the freon circuit.
How to understand that the capillary tube of the thermostat is installed incorrectly?
If the tube is installed too short or is not in contact with the evaporator, the refrigerator will “think” that the chamber is warmer than it actually is. This will lead to the compressor running non-stop and causing severe freezing. If the tube is pinched, the reaction will be slow.
How long does it take to replace a thermostat with your own hands?
For an experienced technician, the process takes about 30-40 minutes. For a beginner, taking into account preparing the tools, dismantling the panels and carefully connecting the wires, this can take from 1 to 2 hours. The main thing is not to rush and carefully monitor the connection diagram.