Owners of modern appliances often wonder how to defrost a Liebherr SBS refrigerator, believing that the NoFrost system completely eliminates the need for manual intervention. This is a common misconception, since even the most advanced units of the German brand require periodic complete shutdown for prevention and deep cleaning. Despite the presence of automatic defrost cycles, an ice crust may form inside the hidden channels and on the heat exchanger, reducing the efficiency of the compressor.
The defrosting procedure for the model Liebherr SBS has its own technical features, ignoring which can lead to failure of the electronics or damage to the seals. Unlike older single-compressor models, it is important to take into account the operation of two independent cooling circuits. Proper preparation and compliance with temporary intervals will help preserve the life of expensive equipment and ensure ideal storage conditions for products.
Features of the Liebherr SBS cooling system
Models of the series SBS are equipped with two independent refrigeration circuits, which allows you to create different temperature conditions in the freezer and refrigerator compartments. The system NoFrost is based on forced circulation of air, which passes through the evaporator, is cooled and supplied to the chambers. Moisture from the air settles on the cold evaporator in the form of frost, which is periodically thawed by a special heater, and the water evaporates.
However, over time, the permeability of the air channels may decrease due to dust or food particles, which disrupts heat transfer. In such cases, the automation may not be able to cope with the volume of frozen ice, and full manual defrostingis required. This is also necessary when an unpleasant odor appears or after a long absence of the owners when the refrigerator was running idle.
It is important to understand that in these models the evaporator is hidden behind a plastic panel on the back wall of the freezer. Direct access to it is closed, so the defrosting process occurs naturally or using gentle heat, but without opening the case, unless you have the skills of a service engineer.
Preparation for the defrosting procedure
Before starting any work, you must empty the chambers of food. Prepare cooler bags or ice packs in advance to ensure frozen supplies do not spoil during the procedure. For the model Liebherr it is critical to disable all active functions, such as SuperFrost or SmartFrostif they were enabled manually.
The next step is to physically disconnect the device from the power supply. Unplug the plug from the socket or turn off the circuit breaker in the panel. Do not try to defrost a running refrigerator by simply setting the minimum temperature - this will overload the compressor and will not give the desired effect.
Provide access to the bottom of the unit where the compressor compartment is located. In SBS models, it is often necessary to remove the decorative panel from below to check the condition of the drain hole and make sure that melt water does not flow onto the floor. Lay down absorbent rags or prepare shallow trays in advance.
⚠️ Attention: Never use sharp objects (knives, screwdrivers) to chip ice inside the chambers. Damage to the evaporator will lead to an immediate release of refrigerant and expensive repairs, which are often not economically feasible.
☑️ Preparing for defrosting
Step-by-step instructions for defrosting
After the refrigerator is unplugged, leave the doors of both chambers completely open. Circulating warm air from the room will speed up the ice melting process. To speed up defrosting in the model Liebherr SBS you can use a fan, directing a flow of warm (but not hot!) air towards the open freezer.
If a lot of ice has formed, you can lay out towels soaked in hot water on the shelves, changing them as they cool. This is a gentle method that will not damage plastic parts and seals. It is strictly forbidden to pour boiling water directly onto the walls or use a hairdryer at maximum power, since a sharp temperature change can deform plastic boxes and damage the sensors.
During the melting process, watch the drain hole in the refrigerator compartment. It may become clogged with mucus or crumbs. Clean it carefully with a special brush or soft wire so that the water flows freely into the drainage tray above the compressor. Water from the freezer will also flow down, so monitoring the floor is required.
While the process is in progress, wipe the internal surfaces with a weak soda solution or a special refrigerator cleaner. This will remove bacteria and odors that may have been preserved in the ice. Pay special attention to the rubber seals - they need to be washed and wiped dry.
How long does defrosting take?
To completely defrost a Liebherr SBS refrigerator with a thick ice crust, it may take from 12 to 24 hours. Do not try to speed up the process with aggressive methods; it is better to wait until the ice begins to come off on its own.
Drying and starting after inactivity
When all the ice has melted and the water has been removed, it is necessary to thoroughly dry the internal space. Wipe all shelves, drawers and walls with a dry cloth. The humidity inside the chambers should be minimal before turning on, otherwise a new portion of moisture will immediately turn into ice.
Leave the doors open for another 30-60 minutes after finishing wiping so that any remaining moisture evaporates. Make sure that the drainage hole is free and that there is no water in the compressor compartment pan (it should evaporate itself during operation, but excess water can cause corrosion).
Only after complete drying can you connect the refrigerator to the network. In models Liebherr with electronic control, a sound signal may be heard after switching on - this is normal, the system is conducting self-diagnosis. Let the unit operate without loading food for 2-4 hours so that it reaches operating temperature.
Check the operation of the display and indicators. If the alarm icon is lit on the screen or the temperature indication is blinking, wait about an hour - usually the system adjusts the parameters automatically. If the error persists, the sensor may have been damaged during the defrosting process or the contact has come loose. Liebherr the alarm icon is on or the temperature indication is flashing, wait about an hour - usually the system adjusts the parameters automatically. If the error persists, the sensor may have been damaged during the defrosting process or the contact has come loose.
Typical mistakes when defrosting
Many users make mistakes that negate the benefits of the procedure or even harm the equipment. One of the most common problems is premature switching on. If you turn on compressor early, while there is still water in the channels, it may freeze in the wrong place, blocking the dampers.
Another mistake is using chemical ice solvents or aggressive cleaning chemicals. Plastics Liebherr are sensitive to some solvents, which can make the plastic brittle or change its color. It is also not recommended to use a vacuum cleaner to suck up water unless it is designed for liquids.
Ignoring cleaning the condenser on the rear wall from the outside is another mistake. While the refrigerator is defrosting, it makes sense to vacuum the rear grille. A radiator clogged with dust causes the compressor to work longer and more intensely, which increases energy consumption.
⚠️ Attention: Do not plug in the refrigerator if you smell a burning smell or see sparking in the area of the plug or socket. First, check the integrity of the power cord and the condition of the electrical network.
Table: Operating and defrosting modes
For a better understanding of the processes occurring inside your Liebherr SBS, read the table of the main modes. It will help distinguish the normal operation of the defrost system from situations that require your intervention.
| Mode / State | Description of the process | Is defrosting required | Frequency |
|---|---|---|---|
| Automatic defrosting | Short-term activation of the evaporator heating element | No | Every 8-12 hours |
| SuperFrost mode | Intensive freezing, the compressor runs non-stop | No (will automatically turn off) | As needed |
| Full manual defrosting | Disconnection from the network, melting ice | Yes | once every 12 months |
| Vacation mode | Economy mode for an empty refrigerator | No | As needed |
Care of seals and ventilation
After defrosting, it is critical to check the condition of the sealing rubber bands. They are the ones who provide the seal. If the rubber is dry or cracked, warm, moist air will enter the chamber, which will immediately turn into frost, nullifying all your work.
Lubricate the seals with special silicone grease or Vaseline oil. This will restore their elasticity and prevent the door from freezing in winter. Also check the gap between the door and the body - it should be uniform around the entire perimeter.
Do not forget about the ventilation holes inside the chambers. In models Liebherr SBS they are located on the back wall and sometimes on the side walls. Make sure food does not block air flow. The circulation must be free for the temperature sensors to read the correct data.
⚠️ Attention: If after defrosting the refrigerator begins to hum louder than usual, check whether it is level. When washing the floors or moving the equipment, the legs could become confused, and the misalignment causes vibration of the compressor.
Frequently asked questions (FAQ)
Is it possible to defrost a Liebherr SBS refrigerator with a hairdryer?
Use of a hairdryer is permissible only at the minimum temperature and with long distance. Directing a hot jet directly onto plastic or ice is prohibited, since local overheating can deform the thin walls of the evaporator or melt the plastic elements of the chamber interior.
Why does the alarm indicator light up after defrosting?
The alarm indicator (usually a red triangle or flashing temperature) lights up if the temperature inside the chambers has risen above the permissible norm. After turning on the refrigerator, give it 2-4 hours to cool down. If the indicator does not go off after 6-8 hours of operation without loading, there may be an electronics failure or a freon leak.
Do door hinges need to be lubricated after defrosting?
Yes, this is a great idea. While the refrigerator is empty and the doors are open, it is convenient to lubricate the door hinges with special oil. This will ensure smooth running and prevent squeaking. However, make sure that the oil does not get on the sealing rubber, as some types of oils can corrode the rubber.
What to do if the water does not leave the drainage?
If there is water in the pan of the refrigerator compartment, it means the drainage hole is clogged. Use a special brush (often included) or a soft wire with cotton wool at the end to clean the channel. You can also pour a little warm (not boiling water!) water into it with a syringe under pressure to break through the dirt plug.
How often does NoFrost need to be defrosted?
Technically, the NoFrost system does not require frequent defrosting. However, manufacturers, including Liebherrrecommend complete defrosting and washing at least once a year. This is necessary not so much for removing ice, but for hygiene, eliminating odors and checking the operation of all unit systems.