Owners of premium equipment Liebherr often face bewilderment when they find an ice crust in the freezer, because the brand is famous for its advanced technologies No Frost. The appearance of ice or blocks of ice indicates a violation of the tightness of the circuit or a malfunction of the automatic defrosting system, which requires immediate intervention.
Ignoring this problem can lead to overload of the compressor and failure of expensive components. In this article we will analyze in detail the mechanics of ice formation, methods for diagnosing faults and ways to eliminate them on your own without calling a technician.
The principle of operation of the No Frost system and the causes of failures
Technology No Frost (literally “no frost”) involves forced circulation of cold air inside the refrigerator chambers. The evaporator, on which the condensation should settle, is hidden behind the back wall, and special fans disperse the dry cold throughout the volume of the freezer. If you see ice on products or shelves, it means that moist air enters the cooling zone or the moisture removal system has failed.
The main reason is often a violation of operating rules, which even experienced users forget about. For example, placing hot foods in the chamber or storing liquids in open containers dramatically increases the humidity inside the circuit. The system simply does not have time to remove excess moisture, and it crystallizes on the coldest surfaces.
It is also worth considering that in models with a combined cooling system (for example, Liebherr Smart Frosta light layer of frost on the walls can be considered normal, but a thick ice crust is already an anomaly. It is important to distinguish between the design features of your model and the real malfunction.
Failure of the door seal and wear of the seal
The most common reason Ice freezing is the entry of warm, moist air from the room into the freezer. This happens when the door does not fit tightly to the body. The main element responsible for sealing is rubber seal (cuff) around the perimeter of the door. Over time, the rubber dries out, loses elasticity or deforms, forming gaps.
You can check the condition of the seal by simple visual inspection and tactile method. Run your hand along the entire length of the cuff: if you feel cracks, stickiness or noticeable indentations, the seal needs to be replaced. Also pay attention to the magnetic tape inside the rubber - it should be tightly magnetized to the metal body around the entire perimeter.
Often the problem lies not in the rubber itself, but in the misalignment of the door or weakening of the hinges. If the refrigerator is not level or the door is often slammed, the geometry could be broken. In this case, cold air will “leave”, and warm air will take its place, creating ideal conditions for ice.
☑️ Diagnosis of the seal
⚠️ Attention: If you find that the door is skewed, do not try to straighten the hinges by force. Adjusting the awnings requires special tools and precision, otherwise you can break the thread or damage the plastic.
Malfunctions of the evaporator defrost system
If the seal is intact and ice continues to build up, the problem may lie in the automatic defrosting system. In refrigerators Liebherr a chain of components is responsible for this process: Defrost heating element, a defrost sensor (thermostat) and a timer (or electronic control module). A failure in the operation of any of these elements leads to the fact that the evaporator becomes overgrown with a “fur coat”, which blocks the air circulation channels.
As a result, the fan begins to drive air through the ice plug, and part of the moisture is blown into the chamber, where it freezes on the food. Often a sign of such a malfunction is a humming fan or insufficient cooling when the compressor is running. Ice can block the damper that regulates the air flow.
Diagnostics of the heating element requires testing the resistance with a multimeter. If the circuit is broken, the heating element will not turn on at the right time and defrosting will not occur. The defrost sensor is checked in the same way, which should open the circuit when a certain temperature is reached.
The normal resistance of a working heating element is usually from 200 to 400 Ohms (the value depends on the specific model and power).What is a “crying” evaporator?
This is the state when melt water does not have time to drain into the drainage and freezes at the bottom of the chamber, forming an ice tray that gradually grows upward to the shelves.
Clogged moisture drainage system
The water formed when the evaporator defrosts must flow freely into a special tray above the compressor, from where it evaporates. If drainage hole clogs with crumbs, ice or mold, the water has nowhere to go. It accumulates in the groove, freezes and turns into an ice plug, which grows and pushes new condensation back into the chamber.
Cleaning the drainage is a procedure that requires care. Do not use sharp metal objects (knives, knitting needles), as they can easily pierce the thin walls of the plastic channel or damage the built-in drainage heater (if the model has one). It is best to use a soft rubber bulb or a special brush.
To defrost the ice plug in the drain, you can use warm (not boiling water!) water by pouring it into the hole using a syringe without a needle. This will help quickly melt the ice and restore water flow. After the procedure, be sure to blow the channel with air.
The influence of operating mode and user errors
Often the reason lies not in the breakdown, but in the way we use technology. Opening the door for a long time, for example, when searching for a product, leads to an active influx of humid room air. In the freezer Liebherr it instantly reacts to changes in humidity, and the water settles with frost.
It is also worth checking the temperature settings. If you set the temperature to the minimum (for example, -24°C or mode SuperFrost) and leave it on constantly, the system may operate abnormally, contributing to increased ice formation. This mode is intended for quick freezing of fresh food, and not for permanent storage.
Another factor is the fullness of the chamber. A freezer that is too full interferes with air circulation. The cold is not distributed evenly, zones with different temperatures and humidity are formed, which provokes local freezing.
| Symptom | Probable cause | Solution method |
|---|---|---|
| Ice on the door and seal | Infrequent closing, rubber wear | Replacing the seal, slamming control |
| Ice block on the back wall | Failure of the defrost heating element or sensor | Diagnostics electricians, replacing the heating element |
| Ice at the bottom of the chamber (on the floor) | Clogged drainage hole | Cleaning the drainage with warm water |
| Frost on products in bags | High humidity products | Sealed packaging, ventilation check |
⚠️ Attention: Technical characteristics and location of components may vary depending on the series of the refrigerator. Always check the technical documentation for your specific model before disassembling.
Full defrosting and diagnostic algorithm
If you find a significant layer of ice, the most effective first step will be to completely defrost the refrigerator. This is not just removing ice, but a necessary procedure for resetting electronic errors and checking the system.
Unplug the appliance, open the doors and leave for at least 24 hours. Do not use a hairdryer or hot water to speed up the process - sudden temperature changes are dangerous for plastic parts and freon tubes. The ice should melt naturally.
After defrosting, turn on the refrigerator empty and listen. Will the fan start? Are there any extraneous sounds? If after 2-3 hours of operation ice begins to appear again, then the problem is technical and requires repair.
Why can’t you pick the ice with a knife?
Mechanical damage to the evaporator or circuit tubes will lead to freon leakage. Repair in this case will be difficult, expensive and will require calling a specialist with refueling equipment.
When you need to call a specialist
There are situations when independent repair is impractical or dangerous. If after checking the seal, cleaning