Defrost sensor in a Samsung refrigerator: where to look and how to check?

Refrigerators Samsung with the system No Frost are equipped with a defrost sensor - a small but critical element that controls the process of removing frost from the evaporator. When this sensor fails, the refrigerator begins to “cry” inside, become covered in ice, or stops freezing altogether. The problem is that its location varies depending on the model, series and even year of manufacture of the equipment. In this article we will analyze where exactly to look for the defrost sensor in popular refrigerators Samsunghow to identify it among other components and what signs indicate a malfunction.

It is important to understand: the defrost sensor (also called defroster or defrost sensor) works in conjunction with a heating element and a timer. If you suspect it is broken, do not rush to disassemble the refrigerator right away - first check the symptoms. For example, if the compressor is running non-stop and ice is building up in the freezer, the problem may lie not only in the sensor, but also in the thermostat or control board. We will help you understand everything in order.

What is a defrost sensor and how does it work?

A defrost sensor is thermistor (resistor, resistance which depends on temperature) which monitors the level of icing on the evaporator. When ice accumulates on the evaporator, the sensor sends a signal to the control module, and the defrost cycle starts: the heating element (heating element) is turned on, the ice melts, and moisture flows into the drainage system.

In refrigerators Samsung the defrost sensor is usually a small plastic case with two wires attached to the evaporator or tube next to it. Its resistance changes depending on the temperature:

• 🔹 At low temperatures (lots of ice), resistance high is a signal to defrost.
• 🔹 At high temperatures (ice has melted), resistance low —the cycle is completed.

If the sensor fails, the control module either does not start defrosting (ice builds up, the compressor overheats) or turns it on too often (products spoil due to elevated temperature). In some models Samsung (for example, series RB or RL), the sensor is integrated into the control board, which complicates diagnostics.

Where is the defrost sensor in Samsung refrigerators?

The location of the sensor depends on type of defrosting system and the model of the refrigerator. Below we have collected typical layouts for popular series.

1. Refrigerators with the No Frost system (RB, RL, RS, RF series)

In most models with No Frost the defrost sensor is located on the evaporator of the freezer or next to it. To get to it:

1. Unplug the refrigerator.
2. Remove the back panel of the freezer (usually secured with latches or screws).
3. The evaporator looks like an aluminum coil tubes The sensor is attached to it or to a nearby plastic part.

In some models (for example, Samsung RB37J5230SA) the sensor is hidden under plastic casing next to the fan. It can be identified by two wires (usually white and red) going to the control module.

2. Side-by-Side refrigerators (RS, RF series)

In two-door models, the defrost sensor is most often located:

• 🔹 Behind the rear panel of the freezer compartment (to the right or left of the evaporator).
• 🔹 Inside the air duct between the freezer and refrigerating chambers (less often).
• 🔹 On the control board (in modern models, for example, Samsung RF23HCEDBSR).

In models with double No Frost system (separate evaporators for each chamber) can be two defrost sensors —one for each evaporator.

3. Old models (before 2015) and drip systems

B. refrigerators Samsung with drip defrosting (for example, series SR or SH) often have a defrost sensor absent —a timer or thermostat is used instead. If it is, you need to look for it:

• 🔹 On the back wall of the refrigerator compartment (next to the drainage hole).
• 🔹 Under the plastic panel above the compressor.

In models up to 2010, the sensor could be mechanical (bimetallic plate) and located directly on the defrost heating element.

How to distinguish a defrost sensor from other sensors?

A defrost sensor is usually has:

- Body made of white or black plastic (less often metal).

- Two wires (sometimes three if there is a screen).

- Markings on the body: "Defrost Sensor", "DS" or code like "5301J-001205".

- Location strictly next to the evaporator or heating element.

Do not confuse it with:

- Temperature sensor (located inside the chamber, often on a shelf).

- Door sensor (on the frame or next to seal).

- Thermostat (large round element with a capillary tube).

How to check the defrost sensor with a multimeter?

If you find the sensor, but If you are not sure of its functionality, check its resistance. To do this:

Disconnect the refrigerator from the mains

Remove the sensor from the mounts (carefully disconnect the connector)

Prepare a multimeter (resistance mode, range 20 kOhm)

Record the room temperature (needed for comparison)-->

Normal resistance values of the defrost sensor Samsung at room temperature (+20...+25°C):

If the resistance:

• 🔹 Equal to 0 (short circuit) —the sensor is faulty.
• 🔹 More than 50 kOhm (break) —the sensor is faulty.
• 🔹 Does not change when heating/cooling —the sensor is “frozen” in one position.

For accurate diagnostics, you can immerse the sensor in a glass of cold water monitor changes in resistance. If the values do not change, replacement is required.

Signs of a malfunctioning sensor. defrosting

The breakdown of the sensor does not appear immediately, but progressively. Pay attention to the following symptoms:

• ❄️ Ice on the back wall of the freezer (even if the refrigerator No Frost).
• 💧 Water under the vegetable boxes (due to constant defrosting).
• ⚡ The compressor runs non-stop (overheating, high power consumption).
• 🔥 The refrigerator does not freeze, but the light inside is on.
• 📛 Error on the display (codes dH, dE, 22E in new models).

In Samsung refrigerators with a display, the error code dH or dE directly indicates a problem with the sensor defrost or heating element. In models without a screen, a malfunction can only be determined by indirect signs.

If you observe ice in the freezer and water in the refrigerator at the same time, most likely the sensor is “stuck” in defrosting mode, and the heating element is constantly working. This is dangerous: the heating element or control board may burn out.

How to replace the defrost sensor yourself?

If diagnostics confirm a malfunction, the sensor must be replaced. To do this:

1. Unplug the refrigerator and defrost it (at least 12 hours).
2. Remove the back panel of the freezer (in models No Frost) or the evaporator cover (in Side-by-Side).
3. Disconnect the sensor connector from the wiring. Be careful - the plastic latches are fragile!
4. Unscrew the sensor from the mount (usually it is held on by one screw or clip).
5. Install a new sensor (necessarily the same model!) and connect the connector.
6. Assemble the refrigerator in the reverse order and turn it on network.

The cost of a defrost sensor for Samsung is from 500 to 2500 rubles depending on the model. For example:

• 🔹 Samsung DA97-08316A - for series RB, RL (1200–1500 rubles).
• 🔹 Samsung DA97-10484A — for Side-by-Side (1800–2200 rub.).
• 🔹 Samsung DA32-00006G —universal (600–900 rub.).

⚠️ Attention: In refrigerators Samsung with an inverter compressor (series BESPOKE, Family Hub), replacing the defrost sensor may require resetting errors through the service menu. Without this, the refrigerator will not start. Please refer to the user manual for official reset instructions.

Frequent errors in diagnostics and repairs

Many users confuse the malfunction of the defrost sensor with other problems. Here are the most common errors:

• 🔧 Confused with the defrost heating elementIf the heating element is burnt out, the sensor may be working, but the refrigerator is still not working. is defrosting.
• 🔌 Did not check the power supply. Before replacing the sensor, make sure that voltage is supplied to its contacts (checked with a multimeter in the "constant voltage" mode).
• ❄️ Ignored the drainage. the drainage hole can simulate the symptoms of a faulty sensor (water in the chamber).
• 📱 Not reset errorAfter replacing the sensor, in some models you need to reset the error code through the service menu (for example, by pressing Power Cool + Power Freeze for 5 seconds).

If the problem remains after replacing the sensor, check:

• 🔹 Control board (may not send a signal to defrost).
• 🔹 Defrost timer (in older models).
• 🔹 Door seal (if it is damaged, ice grows faster).

⚠️ Attention: In refrigerators Samsung with a system Twin Cooling Plus (two separate cooling circuits) defrost sensors can be duplicated If you replaced the sensor in. freezer, but the problem remains, check the sensor in the refrigerator compartment!

FAQ: Frequently asked questions about the defrost sensor in Samsung refrigerators

Is it possible to clean the defrost sensor instead of changing it?

The defrost sensor is an electronic component, and in the traditional sense (for example, it can be washed with water or alcohol). However, sometimes the problem lies in the cannot be cleaned. data-i="230">oxidized contacts in the traditional sense (for example, rinsing with water or alcohol). However, sometimes the problem lies in oxidized contacts connector. Try:

1. Disconnect the sensor connector.
2. Wipe the contacts with an eraser or a special liquid for cleaning electronics.
3. Blow out the connector with compressed air (for example, a keyboard spray).
4. Connect it back and check the operation of the refrigerator.

If this does not help, the sensor must be replaced.

Which defrost sensor is suitable for Samsung RL-33?

For model Samsung RL-33EAMS (and similar RL-34, RL-38) a sensor with article number DA97-08316A or DA97-08316Bis suitable. Check the number on the sticker of the old sensor - sometimes different modifications are used in the same series.

Also check the resistance compatibility:

• 🔹 When +20°C: ~5.5 kOhm.
• 🔹 At 0°C: ~12 kOhm.

What to do if, after replacing the sensor, the refrigerator still does not freeze?

If replacing the sensor did not solve the problem, check:

1. Defrost heating element - it may have burned out (call with a multimeter, the resistance should be 200-500 Ohms).
2. Control board - if it does not send a signal to defrost, the sensor is useless.
3. Thermostat —in some models it duplicates the functions of the sensor.
4. Freon leak —if the compressor works but does not freeze, the circulation system may be damaged.

If you are not sure diagnostics, it is better to call a technician - incorrect repairs can aggravate the breakdown.

Is it possible to temporarily operate a refrigerator without a defrost sensor?

Technically yes, but highly not recommended.Without a sensor:

• 🔹 Refrigerator will not defrost automatically —ice will cover the evaporator and the compressor will overheat.
• 🔹 Electricity consumption will increase (the compressor will work almost constantly).
• 🔹 Risk of damage to the control board due to overload.

If the sensor is burned out and a new one is not at hand, you can manually defrost the refrigerator every 2-3 days, but this is a temporary measure.

Where to buy an original defrost sensor for Samsung?

Original sensors can be ordered:

• 🔹 In official Samsung service centers (warranty on the part).
• 🔹 On AliExpress or eBay (search by article, check reviews).
• 🔹 In stores of spare parts for household appliances (for example, 220 Volt, Eldorado).
• 🔹 On Avito/Yule (used parts, but the risk of running into a faulty sensor).

The cost of the original sensor is higher, but it will last longer than uncertified analogues.