Refrigerators Samsung are famous for their reliability and well-thought-out system No Frostwhich relieves owners from the need for regular manual defrosting. However, even the most advanced equipment is subject to wear, and one of the common causes of temperature violations is the failure of the evaporator defrost sensor. This small but critical component controls the defrost cycles, preventing ice from forming on the radiator.
When this component stops reading the temperature correctly, the compressor may run idle and ice begins to accumulate in the freezer, blocking air circulation. Understanding where exactly the Samsung refrigerator evaporator sensor is located is the first step to troubleshooting the problem yourself without calling a technician.
In this article we will analyze in detail the design of the defrost system, consider the algorithm for searching for the sensor in different models and describe the procedure for replacing it. Diagnostics begins long before disassembling the unit, so it is important to pay attention to the associated symptoms.
Symptoms of a malfunctioning defrost sensor
Before you start looking for the location of the sensor, you need to make sure that the problem lies in the defrost system. Often users mistakenly blame the compressor or thermostat, while the root of the evil lies in incorrect operation temperature sensor. If your Samsung refrigerator has stopped freezing, but is still humming and working, you should check the evaporator.
The main indicator is the appearance of ice on the back wall of the freezer or a complete lack of cold when the fan is running. The system No Frost stops functioning correctly when an ice crust blocks the air channels. As a result, cold air does not enter the refrigerator compartment, and food begins to deteriorate.
Modern models are equipped with a self-diagnosis system that displays error codes on the display or flashes indicators. The following codes are typical for the evaporator (defrost) sensor:
- ❄️ 22E / 22C — error in the freezer defrost sensor (the most common case).
- ❄️ 21E / 21C — error in the refrigerator compartment defrost sensor (in dual-circuit systems).
- ❄️ 41E / 41C — error in the evaporator temperature sensor (alternative marking).
⚠️ Attention: The appearance of an error code does not always mean a physical breakdown of the sensor itself. The problem may lie in broken wiring, oxidation of contacts on the control board, or a malfunction of the control module itself.
Another sign is the continuous operation of the compressor without stopping cycles. Since the sensor does not give a signal that the desired evaporator temperature has been reached, the “brain” of the refrigerator continues to circulate refrigerant, trying to cool the chamber. This leads to increased energy consumption and accelerated wear of the motor.
If you notice that the fan in the freezer is humming or crackling, this may also indicate a problem. The fan blades touch frozen ice, which has formed due to the fact that the defrost did not turn on in time. In such a situation search for a sensor becomes an inevitable procedure.
Design and location in various models
To understand where the evaporator sensor is located, you need to imagine the general architecture of the refrigerator Samsung. In most models with the system No Frost (RB, RL, RS series), the evaporator is hidden behind the rear panel of the freezer. It is there that the air is cooled, which is then pumped by a fan into the chambers.
The temperature (defrost) sensor is usually embedded directly into the fins of the evaporator radiator or fixed to its surface using a special clamp. Its task is to monitor the heating of the evaporator during operation of the defrost heating element. As soon as the ice melts and the temperature rises to a certain threshold (usually +10...+15°C), the sensor opens the circuit, turning off the heater.
The location may vary depending on the year of manufacture and series:
- 🔍 Classic arrangement: To the right or left of the fan, clamped into the aluminum evaporator plates.
- 🔍 In tubes: In some models, the sensor is inserted into a special copper sleeve, soldered into the evaporator tube.
- 🔍 Heating element: Sometimes the sensor is integrated into the design of the defrost heating element itself (tubular or glass).
Access to this unit is always blocked by a plastic panel. In models with a bottom freezer, you will have to completely defrost the unit and remove all shelves and drawers of the freezer. In models Samsung Side-by-Side access may be through a technical hatch or require dismantling the internal lining.
It is important to note that in dual-circuit systems (where the refrigeration and freezer compartments have their own evaporators) there can be two sensors. One is responsible for defrosting the freezer, the second is responsible for defrosting the refrigerator compartment. Their location is symmetrical relative to the evaporators.
Preparation for diagnostics and dismantling
Finding and replacing the evaporator sensor is a procedure that requires care and compliance with safety precautions. Before starting any work, you must turn off the power to the refrigerator by removing the plug from the socket. Working with live electrical components is strictly prohibited.
The second critical stage is complete defrosting. Even if you think there is not much ice, moisture inside the insulation or in the ducts can cause a short circuit when turned on or damage plastic parts if handled carelessly. Leave the refrigerator turned off for at least 12–24 hours.
To carry out the work you will need the following set of tools:
- 🛠️ Screwdrivers: Phillips (Philips) and flat for removing panels.
- 🛠️ Multimeter: To check sensor resistance and integrity chains.
- 🛠️ Hair dryer: Construction or household (at a minimum) for carefully thawing ice around the fastenings.
- 🛠️ Capacity and rags: For collecting melt water.
⚠️ Attention: Do not use sharp objects (knives, screwdrivers) to chip ice! You can damage the aluminum evaporator tubes or pierce the circuit, which will lead to a freon leak and costly repairs.
After defrosting, remove all removable elements of the freezer: shelves, drawers, guides. Typically the evaporator panel is held in place with a few screws and plastic clips. Be careful with the latches - in the cold the plastic becomes brittle and breaks easily.
If the panel is frozen, do not pull it by force. Use a hair dryer to gently heat the perimeter of the panel. Warm air will soften the ice crust, and the panel will be removed without effort. Under the panel you will see the evaporator coil, fan and defrost heating element.
☑️ Checklist before disassembly
Step-by-step instructions for finding a sensor
So, you have reached the “insides” of the freezer. Where exactly should I look for the sensor? Visually, it consists of a small cylinder (often in a copper or aluminum sleeve) with two wires leading to a connector. The color of the wires is usually white, but can vary.
In models Samsung with an error code 22E the required element is most often located in the upper right part of the evaporator (if you look at the open freezer), near the exit point of the tubes or near the defrost heating element. It is pressed tightly to the radiator fins with a metal clamp or clip.
Search algorithm:
- Inspect the defrost heating element (a curved tube at the bottom or a glass tube). Often the sensor is attached directly to it or nearby.
- Check where the evaporator tubes are attached to the body.
- Look for a connector with two wires going to the element touching the metal of the evaporator.
In some modifications, the sensor can be hidden under a layer of thermal insulation (polyurethane foam) or filled with sealant. In such cases, special care is required. If you cannot find it visually, trace the path of the wires from the connector on the control board or from the wiring harness going into the chamber.
Placement nuances in older models
In Samsung refrigerators produced before 2010, the sensor could be located not on the evaporator itself, but on the air duct through which cold air enters the refrigeration compartment. Carefully inspect the air circulation channels.
For accurate identification, you can use the diagram of your model, which is usually pasted on the inner wall of the chamber or on the base. Find the part number (Part Code) and compare the appearance with photographs on the Internet for the query “Samsung evaporator sensor location”.
Diagnostics and element replacement
Once the sensor is found, it must be checked. To do this, disconnect the connector and remove the sensor from its seat (sometimes you need to carefully pull it out of the sleeve). The test is carried out with a multimeter in resistance measurement mode (Ohm).
At room temperature, a working sensor should show a certain resistance (usually in the range of 5–15 kOhm, the exact values depend on the model). If the multimeter shows an open (infinity) or short circuit (0 Ohm), the sensor is faulty and requires replacement.
Table of typical resistance values for Samsung sensors (approximate):
| Temperature (°C) | Resistance (kOhm) | Status |
|---|---|---|
| +25°C (Room) | ~10–12 kOhm | Normal |
| 0°C | ~30–35 kOhm | Normal |
| -15°C | ~100+ kOhm | Normal |
| Any | 0 or ∞ | Faulty |
Replacement is done in the reverse order. The new sensor (the original number often begins with DA32-...) is installed in the sleeve or clamped with a clip on the evaporator. It is important to ensure close contact with the surface, otherwise the temperature readings will be incorrect.
It is best to solder the wire connection and insulate it with heat shrink, since the twists can oxidize under conditions of constant humidity and temperature changes. After assembly, turn on the refrigerator and check if the error has disappeared.
Frequent errors during repair and prevention
The most common mistake is incomplete defrosting. If there is ice left inside, it will melt after switching on and water will get onto the contacts or into the drainage, causing a repeat fault or corrosion. Always let the equipment stand turned off for a day.
The second mistake is using the wrong analogue. The sensors have different resistance curves. Installing a “similar” sensor from another brand or model may result in the defrost turning on too late (the ice will not have time to melt) or too early (the heating element will heat in vain).
⚠️ Attention: If, after replacing the sensor, the error 22E returns after several cycles of operation, the problem may not be in the sensor, but in the heating element itself defrost or in the control board. Check the integrity of the heating element.
To prevent problems with defrosting, it is recommended to completely defrost the refrigerator at least once a year, even if it is a system No Frost. This will help clean the drainage system and check the condition of the seals. Also make sure that food does not block the ventilation holes inside the chambers.
Regularly check the tightness of the door. If warm, humid air enters the chamber, the load on the defrost system increases many times over, and the sensor may not be able to cope with the volume of ice formed.
Conclusion
Finding the evaporator sensor in the refrigerator Samsung is a solvable task if you know where to look. This small element plays a key role in maintaining the correct temperature. Timely diagnosis and replacement of a faulty sensor will extend the life of your refrigerator and avoid food spoilage.
Remember that accuracy during disassembly and care during assembly are the key to successful repairs. If you doubt your abilities or discover more complex faults (freon leak, burnt circuit board), it is better to contact an authorized service center.
How to reset the error after replacing the sensor?
After replacing the part and assembling the refrigerator, turn it on. In most Samsung models, the error resets automatically after successfully completing 1-2 cooling and defrosting cycles. If the error is constantly on, try doing a full reset: unplug the refrigerator for 15-20 minutes, then turn it on again. Some models require entering the service mode (a combination of buttons on the control panel), but usually this is not necessary.
Is it possible to temporarily short-circuit the sensor?
Technically, if you short-circuit the sensor wires (simulate low resistance), the refrigerator will think that the evaporator temperature is high and will constantly turn on the defrost heating element. This will cause the food to defrost and overheat. If you open the circuit (simulate a break), the refrigerator will go into error and stop freezing. Temporary solutions with defrost sensors do not work, since the operating logic is tied to the exact resistance values.
Why does the sensor break?
The main reasons for failure: natural wear of the thermistor, mechanical damage during inaccurate defrosting (chipping ice with a knife), oxidation of contacts due to moisture or power surges in the network, which could damage the sensor circuit on the board.
How much does the original sensor cost?
The cost of the original defrost sensor for Samsung refrigerators varies depending on the model and region, but usually ranges from 10 to 25 US dollars. Analogues may cost less, but the risk of their incorrect operation is higher. It is better to search by part code starting with DA32.