Owners of modern refrigeration equipment are often faced with the misconception that systems No Frost or Low Frost completely free them from the need for manual maintenance. Although the technology significantly reduces the formation of ice crust, it does not guarantee absolute cleanliness of the internal volume throughout the entire service life. Sooner or later, it becomes necessary to carry out general cleaning and defrosting to maintain hygiene standards and energy efficiency of the unit.
The process of defrosting models with a combined cooling system has its own technical features, ignoring which can lead to breakdowns. Unlike static models, it is important here to properly prepare evaporator and electronic components for the procedure. Incorrect actions can damage sensitive sensors or break the tightness of seals, which will ultimately require expensive repairs.
In this article we will analyze in detail the algorithm of actions that will allow you to safely service your device. You will find out how long the process takes, what tools you will need and what you absolutely cannot do while working. Compliance with these recommendations will extend the life of the compressor and maintain ideal conditions for storing food.
The principle of operation of the Low Frost system and the need for defrosting
The technology Low Frost, developed by Liebherr, is an improved version of static cooling. Unlike classic models, where the evaporator is hidden behind the back wall, here it surrounds the entire internal contour of the chamber. This ensures a more uniform distribution of cold and reduces temperature changes, which has a positive effect on the preservation of vitamins in products.
Despite the thoughtful design, moisture is still released from the products and settles on the walls. The system does not remove moisture from the air as aggressively as Full No Frost, so condensation gradually turns into a thin layer of frost. Over time, this layer compacts, turning into ice crustwhich begins to interfere with normal air circulation.
What is the physical difference between Low Frost and No Frost?
In the No Frost system, air is forced by a fan through a hidden evaporator, where moisture is frozen and removed. In Low Frost, cooling occurs from the walls, which retains natural humidity, but requires periodic manual defrosting every 6-12 months.
If you ignore the appearance of ice, the thermal conductivity of the walls deteriorates. The compressor has to work harder to maintain the set temperature, which leads to excessive energy consumption. In addition, a thick layer of ice can mechanically damage sealing rubber bands the doors when closing.
Preparatory stage before defrosting
Before starting any manipulations with refrigeration equipment, it is necessary to properly prepare the workspace. First, empty the cameras of all products. If it’s winter outside, you can take perishable goods to the balcony, having previously protected them from the snow. In the warm season, food is placed in bowls with ice or in thermal bags.
Next, you should disconnect the device from the power supply. Unplug the plug from the socket or turn off the circuit breaker on the panel. This is a critical safety step since water and electricity do not mix. This will also allow you to start the natural thawing process, which is the most gentle on the internal components.
Remove all removable elements: shelves, vegetable drawers, egg trays and guides. It is better to wash them separately in the bathroom with warm water and a mild detergent. While they dry, you will have access to all the interior surfaces of the refrigerator. Inspect the condition door seal for cracks or contamination.
The process of natural thawing and accelerating the process
The safest way to defrost is to leave the doors open and wait. Depending on the thickness of the ice and the room temperature, this process can take from 3 to 10 hours. At this time, the ice will melt and the water will begin to flow down. It is important to ensure that it is collected so as not to flood the kitchen.
Place several layers of old towels or place a flat tray under the bottom of the refrigerator. If your model has a drain channel, make sure it is not clogged. You can carefully clean it using a special brush or soft wire wrapped in cloth, but be careful not to pierce the tube.
Sometimes a situation arises when you need to defrost the equipment urgently. In this case, the use of a hair dryer is allowed, but with serious restrictions. Direct the flow of warm (not hot!) air only at ice formations, avoiding contact with plastic parts and electronic sensors. The plastic may be deformed from high temperature, and the sensor may fail.
⚠️ Attention: It is strictly forbidden to use sharp objects (knives, screwdrivers, blades) to chip ice! The walls of a refrigerator with a Low Frost system are often made of thin plastic or aluminum. One awkward movement will lead to depressurization of the circuit and leakage of freon, after which repairs will be economically unfeasible.
Rules for washing and disinfecting internal chambers
After all the ice has melted and the water has been removed, you need to start washing. For internal surfaces, a baking soda solution (1 tablespoon per liter of warm water) or special products for cleaning refrigerators is ideal. They effectively remove grease and foreign odors without leaving a chemical film.
Use a soft sponge or microfiber. Abrasive sponges can leave micro-scratches on the plastic, which subsequently harbor bacteria. Carefully wipe all corners, places where shelves are attached, and itself evaporatorif it is visible. Pay special attention to the drain hole - it needs to be rinsed using a syringe or a syringe without a needle.
To eliminate persistent unpleasant odors, you can use activated carbon or special odor absorbers, which are sold in hardware stores. Place them in chambers while drying. Lemon slices or coffee beans placed in an open container also work well to remove odors.
After wet cleaning, be sure to wipe all surfaces dry with a clean cloth. The remaining moisture will turn into a new layer of ice faster than usual when the appliance is turned on. Allow the refrigerator to dry completely open for 30-60 minutes before plugging it in.
Comparison table of defrosting methods
So that you can choose the best option for your situation, we have prepared a comparison table of methods. It will help weigh the risks and time costs.
| Method | Time | Safety | Risks |
|---|---|---|---|
| Natural | 6-12 hours | Maximum | No risks, except for possible defrosting of food |
| Hairdryer (warm air) | 30-60 minutes | Average | Deformation of plastic, overheating of sensors |
| Water heating pads | 2-3 hours | High | Risk of hot water splashing, thermal shock of plastic |
| Mechanical (knife) | 10-20 minutes | Critical low | Circuit breakdown, freon leak, unit breakdown |
As can be seen from the table, the mechanical method is the fastest, but also the most dangerous. Using a knife is a guaranteed way to disable the equipment forever. Refrigerant leak requires calling a technician, evacuation of the system and refilling, which is expensive.
Starting the refrigerator after defrosting
When all surfaces are dry and the removable elements are in place, you can plug in the device. Don't rush to load products right away. Let the refrigerator idle for 2-4 hours. This is necessary so that the compressor reaches the optimal temperature and turns off automatically.
During the first hours of operation, the device may make more noise than usual. This is normal: the system returns to operating mode and the refrigerant circulates. Check the tightness of the doors. If the seal has been properly washed and lubricated (you can use a special rubber spray or glycerin), it should provide a tight seal.
☑️ Checklist for completing defrosting
It is better to load products gradually. Place the items that require deep freezing first, then the rest. This will help avoid a sudden jump in temperature inside the chambers, which would cause the compressor to work under overload. Compliance with this rule is especially important for models with Low Frostas they are sensitive to thermal loads.
Frequent errors and precautions
Many users make common mistakes trying to speed up the process or save time. One of the most common is the use of chemical ice removers intended for cars or windows. Such substances can be toxic and, when evaporated, settle on the products, and also destroy the plastic of the internal chambers.
Another mistake is defrosting without turning off the device. Some people try to chip the ice while the refrigerator is running. This is not only dangerous due to the combination of water and electricity, but also pointless: the compressor will constantly try to bring in the cold, and the ice will build up faster than it melts. Always turn off power before starting work.
⚠️ Attention: Do not leave the defrosting process uncontrolled if you use a hair dryer or heating pads. Plastic becomes soft when heated and may lose its shape under the weight of water or tools. Also make sure that water does not get into the base part, where the control electronics are often located.
Regular maintenance, carried out at least once a year, will avoid the formation of a thick “coat” of ice. If you notice that ice is accumulating faster than usual (per month, for example), this may indicate a faulty thermostat or a damaged door seal. In this case, simple defrosting will not solve the problem; diagnostics will be required.
Why does the refrigerator not turn off for a long time after defrosting?
This is normal in the first hours of operation. The system must create a reserve of cold in the walls and products. If the high load mode persists for more than 12 hours, check the tightness of the doors and the room temperature - it should not exceed +30°C.
Frequently asked questions (FAQ)
Is it possible to defrost a Low Frost refrigerator with a hairdryer?
You can use a hairdryer, but only in warm mode (not hot) air and at a safe distance from the plastic. Keep the hairdryer moving, do not heat one point for too long. The best way is natural thawing.
How often do you need to defrost such refrigerators?
Manufacturers recommend carrying out the procedure 1-2 times a year. However, the frequency depends on the humidity in the room, how often the doors are opened and the condition of the seals. If you see a layer of ice more than 3-5 mm, it’s time to defrost.
What should you do if, after defrosting, a plastic smell appears?
This may be a consequence of using too hot water or a hairdryer. Ventilate the chambers, wash them with a soda solution and leave them open for a day. If the smell does not go away, the parts may have become deformed and require replacement.
Does the seal need to be lubricated after washing?
Yes, this will extend the service life of the rubber and improve tightness. Use silicone grease or glycerin. Do not use vegetable oil - it oxidizes and sticks over time.