Failure of the cooling system often leads to spoilage of food, and the thermostat becomes the first suspicious element. It is this unit that is responsible for turning the compressor on and off depending on the temperature inside the chambers. If your refrigerator stops turning off or, conversely, stops cooling completely, perhaps the problem lies in the sensor. Replacing this part requires care, but it is quite within the capabilities of a home craftsman if you know the sequence of actions.
Before starting disassembly, it is necessary to accurately diagnose the breakdown. Sometimes the symptoms indicate thermostat, but in reality the culprit is a freon leak or a malfunction of the start relay. B 80% of cases when the refrigerator works non-stop and a “fur coat” forms in the chamber, a stuck regulator is to blame. Independent dismantling will allow you to check the integrity of the bellows tube and contacts, as well as replace the failed part with a new one.
In this article we will analyze in detail the process of removing the thermostat for various types of refrigerators. We will look at the nuances of removing handles, dismantling the inner lining and safely removing the capillary tube. Safety When working with electrical appliances and refrigerants, this should be a priority.
⚠️ Attention: Before starting any disassembly work, be sure to disconnect the refrigerator from the power supply. Working with the device plugged into an outlet, even with the cover removed, carries the risk of electric shock.
Preparation workplace and the necessary tools
High-quality repairs begin with proper preparation. You will need not only yourself tool, but also free space around the refrigerator. If the appliances are built into the kitchen unit, they will have to be pulled out or removed to provide access to the back wall and top. For standard dismantling, you will need a minimum set that everyone has in their home.
The main tool will be a screwdriver. Most often you need Phillips screwdrivers of different sizes (PH1, PH2) and a flat slotted one. In some models, for example Indesit or Stinol, the screws can be hidden under decorative plugs. You will also need a multimeter for subsequent checking of the circuit, a knife for carefully removing seals or sealant and pliers.
- 🔧 A set of screwdrivers (phillips and flat) is the main tool for removing fasteners.
- 🔌 Multimeter - for checking the integrity of the thermostat contacts.
- 🔪 Construction knife or scalpel - for carefully opening plastic latches.
- 🧤 Gloves - to protect hands from sharp metal edges and possible contamination.
Organize lighting. The inside of the refrigerator, especially the top, where it is usually mounted, is often darkened. Using a headlamp or a powerful lamp will allow you to see small parts and not damage the plastic fasteners during disassembly. thermostat, often darkened. Using a headlamp or a powerful lamp will allow you to see small parts and avoid damaging the plastic clips during disassembly.
☑️ Preparation for repair
Determining the type and location of the thermostat
Location of the temperature controller directly depends on the design of your refrigerator. In older models and budget series, the thermostat is most often located inside the refrigerator compartment, on the side wall or in the corner under the lamp shade. In modern models with the system No Frost sensors can be moved outside the chamber, into the technical compartment.
If the adjustment knob is located outside on the front panel, this does not mean that the thermostat itself is there. The mechanism can be connected to the inside with a long rod or an electronic control unit. Mechanical regulators are characterized by a bellows tube that extends deep into the body. Electronic sensors are small elements on wires.
To understand what you are dealing with, pay attention to the markings. The model number is usually stamped on the thermostat housing, for example TAM-133 or K-59. This data will help you find the exact disassembly diagram for your refrigerator model. Knowing the type of regulator is important for choosing a method for removing it.
How to distinguish an electronic sensor from a mechanical one?
A mechanical thermostat has a massive body with a bellows tube and clicks when the handle is turned. An electronic sensor is a small plastic or metal element on thin wires, often enclosed in heat shrink, without moving mechanical parts.
Removing the regulator in refrigerators with an internal handle
The most common option is a thermostat located inside the refrigerator compartment. In such models, the control handle is placed directly on the stem of the device. You need to start by carefully removing this handle. It can be held on by friction or have a hidden lock.
After removing the handle, you will see a hole in the wall or a plastic casing. If the thermostat is installed in a niche, it is often necessary to remove the top cover of the refrigerator or dismantle the lampshade, which may block access. In models Atlant or Biryusa the thermostat is often mounted on a bracket that is screwed to the inner wall of the chamber.
To remove it, you must unscrew the mounting screws holding the housing thermostat. The bellows tube should then be pulled very carefully. It passes through the seal in the wall of the refrigerator. Sudden movements can lead to depressurization of the tube, which will make the part unusable.
- 🔍 Remove the decorative cover of the handle, if any.
- 🔩 Unscrew the screws securing the thermostat housing to the chamber wall.
- 🧊 Carefully pull out the bellows tube from the seal, without bending it.
- 📸 Take a photo of the wire connection before disconnecting the terminals.
Pay special attention to the wires. They may be short, so don't pull the thermostat too hard. Disconnect the terminal block or individual wires, having previously noted their location. Contact must be clean, without oxidation, otherwise the new regulator will also quickly fail.
⚠️ Attention: The thermostat bellows tube is filled with refrigerant. Damage to the tube (puncture, severe bend) will lead to a gas leak, and the thermostat will stop responding!In some cases, access to the thermostat is blocked by a layer of ice or plastic sheathing. If the compartment is frozen, allow the refrigerator to defrost completely before starting work. Trying to tear off the plastic with a knife in the cold will lead to its destruction.
📊 Where is your temperature regulator located?Inside the refrigerator compartmentOn the outer top panelIn the electronic control unitI don’t know, you need to lookReplacing the thermostat in models with external control
In refrigerators where the temperature control knob is located on the front panel from above, the dismantling procedure looks different. Here the thermostat is usually hidden under the top cover of the refrigerator body. To access it, you will need to remove this cover, which can be secured with screws at the back and latches at the front.
After removing the top cover, you will see the control unit or the thermostat itself attached to the bracket. In such designs, typical of many models LG or Samsung of the old model, the bellows tube runs from the thermostat down along the rear wall and enters the evaporator through a special hole.
The replacement process requires caution when working with the plastic latches of the top cover. They often become brittle over time. Carefully bend them with a flat screwdriver, placing a cloth so as not to damage the housing coating.
Refrigerator type Thermostat location Difficulty of access Dismantling features Single-chamber (old) Inside the chamber, on the right Low Removing the handle and 2 screws Two-chamber (No Frost) Inside, near the ceiling Medium Removal of the ceiling is required With top panel Under the top cover High You need to remove the entire housing cover Built-in Depends on the model High Requires removal from the niche When removing the tube from the technical hole, use gentle movements. Sometimes it can be glued or fixed with sealant. In this case, carefully cut off the old sealant with a knife, trying not to damage the insulation of the wires and the tube itself.
The nuances of working with a bellows tube
The bellows tube is the “nervous system” of your thermostat. It transmits temperature changes to a membrane inside the device, closing or opening an electrical circuit. When removing the regulator, the most important thing is not to break the tightness of this tube and not to deform it.
If the tube is too long and interferes with removal, under no circumstances cut it or bend it at an acute angle (less than a radius of 3-4 cm). The excess tube is usually neatly rolled into a ring and hidden behind the body or in a special compartment. Any microcrack will lead to leakage of working gas and loss of senses!
In some models, the tube is secured to the evaporator with special clamps or adhesive tape. When dismantling the old thermostat, it is better to keep these fasteners or replace them with similar ones so that the new sensor is in close contact with the cooling element. Poor contact will lead to incorrect operation of the refrigerator.
- 🚫 Do not bend the tube at an acute angle - this will interfere with gas flow.
- 🛡️ Protect the tube from sharp metal edges when pulling through holes.
- 📏 Do not shorten the tube; if it is long, roll it into a ring.
- 🔗 Maintain tight contact between the tube and the evaporator during installation.
When installing a new regulator, make sure that the sensitive element (tip of the tube) is in the same area as the old model. Shifting the temperature control zone can cause the refrigerator to freeze too much or not enough.
Checking and installing a new regulator
Before putting the refrigerator back together, it is recommended to check the new thermostat. Even a new part may be defective. Test the contacts with a multimeter in ohmmeter mode. At room temperature, the contacts should be closed (for most models) or open, depending on the type.
Installation is carried out in the reverse order. Insert the bellows tube into the hole, secure the thermostat housing to the bracket and connect the wires. Make sure the terminals are tight and not loose. Vibration during compressor operation should not weaken the contact.
After assembly, turn on the refrigerator. Don't load products right away. Let the equipment run idle for 2-3 hours to reach the operating mode. Watch for on and off cycles. If the refrigerator turns off when the desired temperature is reached and turns on when it rises, the repair was successful.
⚠️ Attention: If, after replacing the thermostat, the refrigerator does not work correctly (does not turn off or turn on), perhaps the problem is not in the sensor, but in the start relay or freon leak. Do not rush to blame the new part.What to do if the new thermostat clicks, but the compressor does not start?
This may indicate a malfunction of the start relay or the compressor itself. Check the voltage at the thermostat output. If there is current, but the motor is silent, the problem is in the motor circuit.
Is it possible to replace the thermostat yourself without experience?
Yes, if you have basic skills in working with tools and an understanding of the principles of electrical safety. The main thing is to act carefully, especially with the bellows tube, and photograph each disassembly step.
Why does the new thermostat not fit?
Thermostats have standardized seats, but the length of the rod or tube may vary. In such cases, you can use adapters or carefully bend the tube, observing the minimum bend radius.
How often should you change the thermostat?
The service life of a high-quality thermostat is 5-7 years or more. Replacement is required only when signs of malfunction appear: the refrigerator does not turn off, does not turn on, or operates intermittently.
Does the type of freon affect the choice of thermostat?
Yes, thermostats are designed for a certain temperature range and pressure, which depends on the type of refrigerant. When purchasing, check whether the part is suitable for your type of freon (R134a, R600a, etc.).