Sudden defrosting of food or, conversely, turning it into an ice monolith often indicates a malfunction of the temperature control system. In brand refrigerators Indesit a special sensor is responsible for maintaining the set mode - thermostat. When this element fails, the compressor stops receiving correct signals about the need to turn on or off, which leads to damage to the contents of the chambers.
Many equipment owners rush to call a technician, but the procedure for replacing the thermostat in models Indesit (such as C 138 G, T 18 or DS 167) is quite simple and can be done by a person with basic skills in handling tools. The main thing is to observe safety precautions and strictly follow the algorithm of actions so as not to damage the fragile plastic elements of the case or electrical contacts.
In this article we will analyze in detail the process of diagnosing a malfunction, selecting a compatible spare part and installing it. You will learn how to properly disassemble the internal panel of the refrigerator, disconnect the old regulator and install a new one, restoring the equipment to operability without overpaying for service.
Fault diagnosis: signs of thermostat failure
Before you start disassembling the unit, you need to make sure that the problem lies in the thermostat and not in a leak freon or compressor malfunction. The main symptom of a breakdown is incorrect operation of the cooling cycle. If the compressor runs continuously without turning off, and the temperature in the chamber drops below normal, freezing fresh food, this is a classic sign of “sticking” thermostat contacts in the closed position.
The opposite situation also exists: the refrigerator is silent, the compressor does not start, and the temperature inside rises to room temperature. In this case, the control circuit is broken and the signal to start the engine is not received. However, it is worth considering that similar symptoms may appear if the start relay or the motor-compressor itself malfunctions, so a visual inspection and simple testing of the contacts will not be superfluous.
Pay attention to the behavior of the indicators and sounds. If you hear clicks, but the engine does not start, or, on the contrary, the unit hums constantly, it is worth checking the integrity of the thermostat capillary tube. Mechanical damage, corrosion or oxidation of contacts can also cause failure.
⚠️ Attention: If traces of oil or obvious deformation are visible on the thermostat tube, replacing the element is mandatory. Using a damaged sensor can lead to unstable operation of the entire system.
A multimeter is often required for accurate diagnostics. By ringing the thermostat contacts at different temperatures (cooled and warmed states), you can determine its performance with a high degree of probability. If the resistance does not change or shows an open/short circuit in both states, the part must be replaced.
Preparation for repair: tools and safety measures
Any work related to electrical devices requires strict adherence to electrical safety rules. The first and most important step is to completely disconnect the refrigerator Indesit from the power supply. It is not enough to simply turn off the button; you must unplug the plug from the socket to eliminate the risk of electric shock when manipulating the wiring.
To successfully replace the thermostat, you will need a minimum set of tools. The main ones are Phillips and flat-head screwdrivers for dismantling fasteners and plastic plugs. You may also need pliers or round nose pliers to carefully remove the terminals from the contacts if they are tight.
- 🔧 Phillips and slotted screwdrivers (different sizes)
- 🔌 Multimeter or circuit tester
- 🧤 Work gloves to protect your hands from sharp edges
- 📸 Smartphone for photographing the connection diagram
Pay special attention to preparing the workplace. Provide good lighting for the interior of the refrigerator, as the thermostat is often located in hard-to-reach places hidden by plastic panels. Prepare a container in advance for folding the screws so as not to lose them during work.
☑️ Checking readiness for repair
Removing the old thermostat
The process of accessing the thermostat in refrigerators Indesit may vary slightly depending on the model, but the general principle remains similar. Most often, the temperature regulator is hidden under a plastic cover inside the refrigerator compartment or integrated into the control unit located above the door. In some models, such as Indesit C 132, it is necessary to remove the top decorative panel.
Start by carefully removing the temperature control knob, if it is located outside. Then remove all visible screws securing the access panel. Proceed with caution: the plastic in older refrigerators becomes brittle and may crack if pressed hard. If the panel is held on by latches, use a flat-head screwdriver under a cloth to avoid scratching the surface.
After removing the panel, you will see the thermostat itself - usually this is a device with a long capillary tube that goes deep into the body or is wound around the evaporator. Critical before disconnecting the wires, take a photo of the connection diagram. Wire colors may vary, and reversing contacts may result in a short circuit.
⚠️ Attention: The thermostat capillary tube is very thin and susceptible to kinks. When removing the old sensor, do not use excessive force to avoid damaging the tube of the new element or other components of the refrigerator.
Disconnect the wire terminals from the thermostat contacts. If they have oxidized, carefully clean them. Then remove the sensor from its seat, being careful not to touch or bend the capillary tube. In some cases, the tube may be secured with a bracket or clip to the evaporator - it also needs to be removed.
What to do if the terminals cannot be removed?
If the terminals are tightly seated on the contacts, do not pull them by the wires. Carefully pry the base of the terminal with a thin screwdriver or use a special puller. You can first spray the contact with penetrating lubricant (WD-40), but make sure that the liquid does not get on the electrical contacts, otherwise it will need to be carefully removed before assembly.
Comparison of characteristics and selection of a new element
Thermostats for refrigerators Indesit are produced by various manufacturers, such as Tam, Ranco or Orbital. When purchasing a new part, you need to pay attention not only to the appearance, but also to the markings. The main parameters are the operating temperature range, the length of the capillary tube and the method of fastening.
The length of the capillary tube is one of the most important parameters. If the tube is too short, the sensor will not be able to correctly read the temperature in the desired zone of the evaporator. If it is too long, it will have to be laid in coils, which can disrupt heat transfer. Standard lengths vary from 0.6 to 1.3 meters.
| Parameter | Description | Importance |
|---|---|---|
| Marking | Manufacturer code (for example, K59-L1102) | High |
| Tube length | Distance from body to sensing element | Critical |
| Contact type | Location and number of pins | High |
| Temperature range | On and off temperature | Medium |
It is also worth considering the presence of additional conclusions. Some thermostats have a third contact for connecting an indication or alarm lamp. If this contact is not used in your model, you can install a universal thermostat, leaving the extra terminal free, but it is better to look for a complete analogue.
Installation and connection of a new thermostat
Installation of a new thermostat is carried out in the reverse order of dismantling. First, you need to carefully install the capillary tube in the same position in which it was previously located. If the evaporator had special brackets or clamps, be sure to secure the tube in them. This will ensure proper heat exchange and correct operation of the automation.
Connect the wires to the contacts of the new thermostat, focusing on the photo taken earlier. Make sure the terminals are tight and not loose. Poor contact can cause sparking and heating, which is dangerous in humid conditions inside the refrigerator compartment. If there are signs of corrosion on the contacts, it is better to replace the entire terminals.
After connecting the electrical part, secure the thermostat housing in the seat. Make sure that the adjusting screw (if there is one inside) is set to the middle position so that when you first turn on the operating modes are not extreme. Then reinstall the plastic panel and the regulator knob.
The final stage of assembly is to check the reliability of all fasteners. The panel should not wobble or creak. In models Indesit with the No Frost system, access to the thermostat may be limited by additional elements, so assemble the structure carefully, not forgetting all the screws.
First start-up and setting the temperature mode
After completing the assembly, you can turn on the refrigerator to the network. Do not immediately load food into the chamber - let the unit run idle for at least a few hours. This will allow the system to return to operating mode and stabilize the temperature. The primary cycle can be long, especially if there is air left in the system or cold injection is required.
Set the temperature control knob to the middle position (usually number 3 or 4 on the scale). After 2-3 hours, check the temperature in the refrigerator compartment using a household thermometer. The optimal range is from +2 to +6 degrees Celsius. If the temperature differs significantly, adjustment will be required.
Inside the thermostat housing there is often an adjusting screw, which can be accessed through a special hole or after partial disassembly. Turning this screw clockwise usually increases the shutdown temperature (the compressor turns off earlier), and counterclockwise it decreases it. Adjustments should be made in microscopic steps (literally a quarter turn), waiting for stabilization after each change.
⚠️ Attention: Factory thermostat settings may vary depending on the specific model and year of manufacture. Construction parts and calibration screws may have different locations. Always check the technical documentation for your specific model Indesit before interfering with calibration.
Monitor the cyclic operation of the compressor after adjustment. In normal mode, the refrigerator should turn off and turn on periodically. If the cycle is too short or too long, you may need to repeat (fine-tuning) or check the tightness of the system.
Frequently asked questions (FAQ)
Can I use a thermostat from another refrigerator model?
The use of analogues is possible if the main parameters are the same: temperature range, capillary tube length and fastening type. However, it is better to look for original spare parts or certified analogues, since a discrepancy in characteristics can lead to improper operation of the compressor.
Why does the refrigerator not turn off after replacing the thermostat?
There may be several reasons: the adjusting screw is incorrectly adjusted, the capillary tube does not fit tightly to the evaporator, or the problem lies not in the thermostat, but in a leak freon or malfunction of the compressor itself. A new part may also be defective.
How often do you need to change the thermostat in an Indesit refrigerator?
The service life of the thermostat is usually 5-10 years or more. It does not require scheduled replacement. They change it only when signs of malfunction appear: temperature incontinence, continuous operation or complete failure to switch on.
Is it dangerous to change the thermostat yourself?
Replacing the thermostat is not associated with a leak in the refrigerant (freon) circuit, so it is technically safe if you follow electrical safety rules. The main thing is not to damage the capillary tube and connect the wires correctly.