Brand refrigerators Samsung with system No Frost have earned a reputation as reliable assistants in the kitchen, but even they are not immune from technical failures. One of the most common reasons why ice begins to accumulate in the freezer or cold air stops circulating is a breakdown. This heating element is responsible for the regular melting of the ice that accumulates on the evaporator, and its failure leads to a “coat” of fouling on the radiator, which blocks the air channels. Defrost heating element. This heating element is responsible for regularly melting the ice that builds up on the evaporator, and its failure leads to a “fur coat” overgrowing the radiator, which blocks the air channels.
If you notice that the temperature inside the chambers has ceased to correspond to the set values, and a thick layer of ice is visible on the back wall of the freezer, ignore it it is impossible. Diagnostics of the heating element - a process that is accessible even to a non-professional with basic tools and caution. In this article we will look in detail at how to determine the malfunction, what tools will be needed and what to look for when checking the power circuits.
Before you start disassembling, it is important to understand the principle of operation: the heater is turned on by a timer or a signal from the control board several times a day. If the element is burned, the ice does not melt, the fan stops, and the cold stops flowing into the refrigeration chamber. A critical indicator of serviceability is a resistance in the range of 200-300 Ohms; the value "infinity" indicates an open circuit. Do not rush to call a technician, since in most cases the problem can be diagnosed independently in 15-20 minutes.
Symptoms of a malfunctioning heating element
The first step in solving the problem should be the correct identification of the symptoms. Users often confuse a heating element failure with a fan malfunction or a clogged drain hole. The main indicator is the nature of ice formation: if the evaporator is covered with a uniform but very thick layer of ice that does not melt even after defrosting the refrigerator for 24 hours, this is an alarming signal.
In models Samsung with digital control, error codes may light up on the display. The self-diagnosis system records the absence of temperature rise in the evaporator zone during the defrost cycle. The most common codes indicating problems in the defrost system:
- 🧊 22E / 22C —error of the defrost sensor (defroster), which may show an incorrect temperature.
- ❄️ 21E / 21C —error of the evaporator sensor, often accompanied by problems with heating.
- 🔥 13E —error of the defrost heating element itself (open circuit or short short circuit).
- ⚙️ 40E —a communication error between the main board and the display board, but can mask problems with the sensors.
It is also worth paying attention to the operation of the fan. If, when the freezer door is open, you do not hear the characteristic noise of a running motor, although it hums, the fan blades may be frozen in an ice crust. This is a direct consequence of the fact that Defrost heating element did not do his job. In some cases, ice can block the air duct damper, causing the refrigerator compartment to become warm and the freezer to become too cold.
⚠️ Attention: Do not try to chip the ice with a knife or sharp objects! Damage to the evaporator tubes will lead to freon leakage, making repairs uneconomical. Defrost the camera only naturally.
It is important to distinguish a primary fault from a secondary one. If the heating element burned out, this could be due to a power surge or natural wear of the nichrome spiral. However, sometimes the cause is a stuck relay on the control board, which continuously supplies voltage to the heater, causing it to burn out. Therefore, simply replacing an element without checking the rest of the circuit may not solve the problem completely.
Necessary tools and preparation for diagnostics
For a quality check Defrost heating element in the refrigerator Samsung you will need a minimum set of tools that most home craftsmen can find. The main requirement is safety and accuracy of measurements. You should not rely on visual inspection, since the nichrome thread often burns out inside a ceramic tube or quartz casing, remaining externally intact.
The basic list of equipment includes a digital multimeter (tester), which is capable of measuring resistance (Ohm) and checking the integrity of the circuit (testing mode). You will also need screwdrivers (Phillips and flathead), a hair dryer to speed up defrosting (if ice interferes with access) and, possibly, pliers to remove the clamps. Make sure that the batteries in the multimeter are charged, as a “dead” device may indicate a false open circuit.
Preparing the refrigerator for diagnostics is a critical step. Before removing the back panel of the freezer, the unit must be completely defrosted. Even if there seems to be little ice, moisture can get on the electrical contacts or control board, causing a short circuit when voltage is applied.
- 🔌 Unplug the refrigerator from the electrical outlet - unplug the plug.
- 🚪 Clear the freezer of food and drawers.
- ⏳ Leave the doors open for at least 12-24 hours for the ice inside the case to completely melt.
- 🧹 Prepare rags and a container to collect water that flows during melting.
If there is no time for complete defrosting, you can use a hair dryer, but with great caution. Direct the warm air onto the plastic panel, but do not hold the hair dryer too close to avoid melting the plastic or damaging the seals. After removing the panel, thoroughly wipe all surfaces dry. Humidity is the main enemy of electronics, and residual water can distort the multimeter readings when checking the resistance of the heating element.
☑️ Preparing to check the heating element
Access to the defrost heating element: disassembling the freezer
In refrigerators Samsung No Frost the heating element is located behind the back wall of the freezer, directly on the aluminum finned radiator (evaporator). The design may vary slightly depending on the model (Side-by-Side, two-door, three-door), but the general algorithm of actions is similar. Your task is to get to the electrical contacts of the heating element without damaging the fragile plastic latches.
First you need to remove all the shelves and drawers. Next, take a look at the back panel fasteners. In some models, the screws may be hidden under decorative plugs or located deep in the niches. Use a magnetic screwdriver to avoid dropping the fastener inside the case, where it will be difficult to remove. After unscrewing all visible screws, the panel must be carefully pressed around the perimeter.
Plastic becomes brittle in the cold, so proceed without sudden jerks. If the panel does not come off, check to see if you forgot to remove sensors or wires that may be attached to it. Often the temperature sensor wiring passes through holes in this panel, and they need to be carefully disconnected or released from the clips.
After removing the panel, the evaporator will be revealed to your view. The heating element may look like a curved tube that goes around the bottom of the radiator, or like a quartz glass tube located in a special groove under the evaporator. Modern models Samsung often use tubular heaters enclosed in a metal shell. Visually inspect the element for swelling, cracks or burnt marks. However, as mentioned earlier, external integrity does not guarantee operation.
⚠️ Attention: When removing the panel, try not to sharply pull the sensor wires. Their contacts often oxidize, and careless handling can lead to breakage of thin wires, which will create a false impression of a malfunction of the heating element.
If access to the contacts of the heating element is difficult due to ice residues, do not use force. It is better to wait or gently warm the area with a hairdryer. The heating element contacts are usually protected by rubber couplings or heat shrink. They will need to be removed or moved aside so that the multimeter probes touch the metal leads of the heater.
Difficulties in removing the panel
If the panel cannot be removed, it may be frozen. Don't break the latches! Direct a stream of warm air from a hair dryer to the panel joints and wait 1-2 minutes. The ice will melt and the plastic will come off easily.
Checking the heating element with a multimeter: step-by-step instructions
This is the most critical diagnostic stage. It is measurements with a multimeter that will give an unambiguous answer as to whether heating elementis working. Make sure the refrigerator is unplugged and there is no moisture on the contacts. Switch the multimeter to resistance measurement mode (indicated by the Ω symbol), selecting the limit of 2 kOhm (2000 Ohm).
Find the two leads of the heating element. Depending on the design, wires connected through terminals may approach them, or the heating element itself may have protruding contacts. Touch the multimeter probes to these terminals. Polarity does not matter in this case. Numbers should be displayed on the device screen.
Interpretation of multimeter readings:
- 📉 200-300 Ohm (or similar values, for example, 180-350 Ohm) - the heating element is working, the spiral is intact.
- ♾️ 1 or OL (on different devices in different ways) - open circuit, heating element burnt out, requires replacement.
- 0 Ohm or a value close to zero - short circuit inside the element (less common, but possible).
If the device shows an open circuit, this confirms the need replacements. But don't rush to put everything back together. Also check the integrity of the suitable wires. Ring the cable from the connector to the heating element itself. Sometimes the insulation frays or the contact burns out at the connection point (twist or terminal). It is also worth checking whether voltage is reaching the body of the heating element (breakdown to ground), although it is difficult to do this with a multimeter in ohmmeter mode without special equipment, but you can visually assess the condition of the insulation.
It is important to note that in some models Samsung the heating element consists of two sections or has several heating circuits. If your heater has four terminals, it may be composite. In this case, you need to check the resistance between pairs of contacts according to the diagram (usually it is printed on the marking or in the service manual). Most often, there are two contacts.
Diagnostics of adjacent components of the defrost system
Even if defrost heating element shows normal resistance, the system may not work due to other components. The defrost circuit includes temperature sensors and a timer (or electronic control board). The operating logic is as follows: the board gives a command to turn on the heating element, but only if the sensors confirm that the evaporator temperature is low enough and the time has come.
Particular attention should be paid defrost sensor (defroster). This is a small element that is attached to the evaporator. Its task is to inform the board when the ice has melted in order to turn off the heating element. If the sensor is lying and shows that the temperature is already high, the board will simply not turn on the heating. You can check it by measuring the resistance at a certain temperature (usually at room temperature it is the same, but when cooling it changes).
Table of typical faults and their symptoms:
| Component | Fault symptom | Check method |
|---|---|---|
| Defrosting heating element | Ice does not melt, resistance is infinite | Resistance measurement with an Ohmmeter |
| Defrost sensor | The heating element does not turn on or constantly heats | Resistance measurement at t° |
| Control board | No voltage on the contacts of the heating element | Voltage measurement with a voltmeter |
| Fuse | Open circuit, heating element does not heat | Circuit continuity |
There may also be a thermal fuse in the circuit. It is triggered if the heating element overheats (for example, when the relay is stuck). If the thermal fuse burns out, it breaks the circuit and the heating element stops receiving power, even if it itself is intact. It must be ringed - the resistance must be zero.
Sometimes the problem lies in the oxidation of the contacts in the connectors. In conditions of high humidity inside the chamber (during defrost cycles), the copper oxidizes and contact is lost. Carefully inspect all chips and connectors. If you see green deposits or rust, clean the contacts or replace the connector. This often helps to revive a completely working unit.
⚠️ Attention: Technical characteristics of sensors and heating elements may vary depending on the specific series of the refrigerator Samsung. Always check the parameters with the markings on the parts of your device before purchasing a replacement.
Replacing the heating element and assembling the refrigerator
If diagnostics have confirmed that Defrost heating element it is faulty, it must be replaced. These elements are not subject to repair (soldering of nichrome), since in the factory they are filled with a special dielectric powder and hermetically sealed. You need to buy a new part based on the Service Code indicated on the body of the old heater or in the documentation of the refrigerator.
The replacement process is usually straightforward. Disconnect the wires from the old heating element (after photographing the connection diagram so as not to confuse the polarity, although it is not important for the heater itself, it is important for the sensors). Remove the mounting brackets or pull the heating element out of its seat. Install the new element, making sure it fits snugly against the evaporator or sitzt in its housing. Poor contact with aluminum will reduce the efficiency of heat transfer.
After installation