Finding the responsible unit that regulates the temperature becomes critically important when the refrigerator stops freezing or starts working non-stop. Equipment owners Samsung often face the need for self-diagnosis in order to understand whether the problem lies in electronics or mechanics. The exact location thermostat directly depends on the year of manufacture of the device and the type of defrosting system.
In older models, this element is a mechanical device with a capillary tube, which is easy to find visually. Modern units are equipped with sophisticated electronics, where the control function is performed sensorsbuilt directly into the evaporator or air duct. Understanding this difference will save you hours of useless disassembly of the case.
Before you begin dismantling the panels, you must disconnect the device from the power supply. Safety when working with electrical appliances is not just a formality, but a prerequisite. Further actions will depend on which category your Samsung refrigerator belongs to Samsung refrigerator.
Differences between mechanical and electronic controls
The first step in determining the installation location is to analyze the control panel. If there is a rotary knob with numbers from 1 to 7 on the front wall or inside the camera, this is a classic mechanical system. In such models, the thermostat is located directly in the refrigerator compartment, often hidden behind a plastic casing or integrated into the adjustment knob.
The situation changes dramatically if there is a digital display on the front panel. In this case, there may not be a physical thermostat in the usual sense at all. Its role is played by electronic thermal sensors (thermistors), which transmit signals to the main control module. Their location is less obvious and requires partial disassembly of the internal space.
Electronic control systems can achieve higher accuracy, but their diagnosis is more difficult. The mechanical regulator can be checked with a multimeter “cold” and “warm” by closing and opening the contacts. To check an electronic sensor, knowledge of the nominal resistance at a specific temperature is often required.
⚠️ Attention: An attempt to replace an electronic sensor with a mechanical analogue without reworking the entire control circuit will damage the main controller. Do not try to upgrade the control system yourself.
It is important to consider that in two-compressor models Samsung sensors are present in each chamber separately. This doubles the number of points that need to be checked when cooling problems occur. One sensor can work properly while the second one has already failed.
Location in models with a drip defrosting system
In classic models with a “crying” evaporator, the thermostat is most often located inside the refrigerator compartment. The standard installation location is the upper part of the internal volume, next to the lighting lamp or in a corner under the ceiling. A capillary tube, sensitive to temperature changes, goes deep into the wall or is attached to the evaporator.
To get to the unit, it is often enough to remove the plastic cover that hides the fasteners. In some modifications Samsung the regulator is built into the backlight housing. By carefully prying the latches, you can gain access to the terminals and yourself thermostat. Visually, it is a small box with three or four contacts.
- 🔍 Look for the thermostat in the upper right or left corner of the chamber; it is often hidden by a decorative panel.
- 🔧 Access may require a Phillips screwdriver and a flat-head removal tool latches.
- ⚡ Be sure to check the integrity of the capillary tube: if it is damaged, the refrigerant has evaporated and the regulator will not work.
Sometimes the temperature regulator is hidden behind the back wall of the chamber, but this is typical for older or specific series. If there is no access from the front, inspect the insides carefully. The lack of visible controls inside may indicate that the sensor is hidden in a technology compartment behind the back wall, which will require deeper disassembly.
Searching for sensors in the No Frost system
In systems No Frost the situation is complicated by the presence of an automatic defrosting system. Here the thermostat (or defrost sensor) is located directly on the evaporator, which is hidden behind the back panel of the freezer. It is impossible to get to it without removing this panel.
The search process begins with emptying the freezer of food and drawers. Then the screws securing the back wall are unscrewed. Often they are hidden under decorative plugs. After removing the panel, you will see an evaporator - a radiator entangled with tubes. It is on it, usually in the lower part or in a special hole, that the defrost sensor is installed defrost sensor.
Unlike mechanical models, there is no long capillary tube. The sensor is a small element enclosed in a plastic housing, which is inserted into a metal sleeve on the evaporator. It monitors the temperature of the heater to prevent overheating or underheating during the defrost cycle.
| Sensor Type | Location | Function | Failure Signs |
|---|---|---|---|
| Sensor defrost | On the evaporator (freezer) | Control of the defrosting cycle | Ice build-up, “coat” |
| Refrigeration chamber sensor | Inside the chamber or in channel | Temperature adjustment | Does not freeze or freezes too much |
| Freezer chamber sensor | At the top of the freezer | Frost control | Warmth in the freezer, compressor operation without stopping |
| Ice maker sensor | In the ice maker area | Ice formation control | No ice production or overflow |
It is important not to confuse the defrost sensor with a thermal fuse. They are often located nearby, in the same bundle, but perform different functions. The thermal fuse is an emergency element that burns out during critical overheating, breaking the circuit. Thermostat It also works cyclically, constantly turning on and off.
☑️ Checking the No Frost sensor
Access to the thermostat through the back panel
In a number of models Samsung, especially those that are built-in or have a layout, access to the temperature regulator is provided from the side of the compressor compartment. This is the lower part of the refrigerator, closed with a metal or plastic cover.
Here the thermostat can be mounted on the wall of the case or on a special mounting strip next to the compressor. In this case, the capillary tube passes through the technological hole into the chamber. This arrangement option is typical for equipment where the internal space is maximally used for useful volume.
To carry out the work you will need:
- 🛠️ A set of screwdrivers (phillips and flat) for removing the protective cover.
- 🧤 Gloves to protect your hands from sharp edges metal.
- 🔦 Flashlight, since there is usually no lighting in the compressor niche.
Be careful when working in the compressor compartment. There are not only electrical connections, but also refrigerant pipes. Mechanical damage to the tubes will lead to freon leakage, which will require expensive repairs involving a specialist with a vacuum pump.
⚠️ Attention: If you find traces of oil or hear the hissing of gas in the area of the thermostat mounts, stop work immediately. This is a sign of a violation of the tightness of the circuit, which requires professional intervention.
Diagnostics and serviceability check
Having understood where is the thermostat located, it is necessary to check its performance. The simplest method for mechanical models is to close the input and output contacts, bypassing the regulator itself. If the refrigerator starts working after being plugged in, then the problem is in the thermostat.
For electronic diagnostics, you will need a multimeter. At room temperature, the contacts of a mechanical thermostat are usually closed (resistance is close to zero). If you put the sensor in the freezer for 15-20 minutes, the contacts should open with a characteristic click, and the multimeter will show an open circuit.
What do the error codes on the Samsung display mean?
Error codes such as 22C or 24C often indicate a malfunction of the temperature sensors. 22C - error in the refrigerator compartment sensor, 24C - error in the freezer compartment sensor. This confirms that the problem needs to be looked for in electronics, and not in mechanics.
Electronic sensors are checked by measuring resistance. The values change depending on the temperature, so it is important to check the resistance table for your specific model Samsung. If the resistance of the sensor is infinitely high or equal to zero at any temperature, the element is faulty.
A frequent problem is not the failure of the element itself, but the oxidation of the contacts in the connector. Under conditions of constant humidity and temperature changes, connections may become coated with an oxide film, increasing resistance. Cleaning the contacts sometimes solves the problem without replacing the part.
Replacing the thermostat: step-by-step instructions
If diagnostics confirm faulty, needs to be replaced. For mechanical models, the procedure is standard: remove the old regulator, carefully pull the capillary tube out of its seat and install a new one. It is important not to bend the tube, as this will disrupt the circulation of freon inside the sensitive element.
In electronic models, the process is simpler in terms of physical access, but requires accuracy. The sensor is usually secured with a plastic clip or screw. By disconnecting the connector, you remove the old element. When installing a new one, make sure it fits snugly in the evaporator sleeve. Poor contact with metal will result in incorrect temperature readings.
After replacement, be sure to perform a test run. Leave the refrigerator empty for several hours and check the temperature rise. If the cycle of turning the compressor on and off is normal (approximately 10-15 minutes of operation and 20-30 minutes of rest), the repair can be considered successful.
Is it possible to temporarily operate a refrigerator with a bypass (jumper) thermostat?
T