The situation when instead of fresh vegetables you find ice blocks, and milk turns into a solid block, is familiar to many owners of household appliances. This is not just inconvenience, it is a signal that thermodynamic mode the operation of your unit is disrupted. The refrigerator compartment is designed to store food at temperatures from +2 to +5 degrees Celsius, and any significant deviation towards minus leads to damage to the contents.
Most often the problem lies in simple inattention or a settings failure, but sometimes the reason lies deeper - in a malfunction defrost systems or refrigerant leak. Ignoring the first signs of icing can lead to more serious damage, such as compressor failure due to wear and tear. In this article we will analyze in detail why this happens and how to return the equipment to normal operation.
Before calling a technician or buying a new unit, it is worth conducting independent diagnostics. Often it is enough to simply defrost the chamber or rearrange the food for the situation to return to normal. However, if an ice crust appears regularly, you need to look for the root of the problem in the technical components.
Incorrect setting of the thermostat and temperature conditions
The most common reason why food in the refrigerator begins to freeze is an incorrectly set temperature. Users often set the controller to maximum cooling without taking into account the current load on the chamber or the ambient temperature. In models with electronic control, a failure may occur due to a power surge, and the unit begins to work in enhanced mode.
If you have a mechanical one, its scale is usually graduated from 1 to 7, where 7 is the maximum cold. Setting the knob to maximum causes the compressor to work almost non-stop. As a result, the evaporator is overcooled, and the cold air circulating through the chamber freezes all contents, especially what lies closer to the air flow outlet. thermostat, its scale is usually graduated from 1 to 7, where 7 is the maximum cold. Setting the knob to maximum causes the compressor to work almost non-stop. As a result, the evaporator is overcooled, and the cold air circulating through the chamber freezes all contents, especially what lies closer to the air flow outlet.
- ❄️ Check the current position of the temperature regulator and set it to the average value (usually 3-4).
- 🌡️ Use a separate thermometer to check the actual temperature inside the chamber at different points.
- 🔌 Let the refrigerator stand off for 15-20 minutes if you just changed the settings so that the system stabilizes.
It is important to understand what thermostat reacts on the temperature of the evaporator or air in the chamber, but it is not omnipotent. If you have loaded the refrigerator with a large amount of warm food, the unit may temporarily go into the hard freeze mode to compensate for the heat. However, if the mode does not reset automatically after reaching the set parameters, this is a cause for concern.
Modern models with the system No Frost have more complex temperature control logic. Here, an electronic module is responsible for the process, which reads readings from several sensors. If one of the sensors defective transmits incorrect data (for example, it shows that it is warm in the chamber, although it is already frosty there), the controller will drive the cold until everything is covered with frost.
⚠️ Attention: If, after switching the controller to minimum cold mode, the products continue freeze after 24 hours, the problem is not in the settings, but in a malfunction of the electronics or sensors.
Problems with the door seal and chamber sealing
The second most common reason for the appearance of excess ice and freezing of food is a violation of the seal of the refrigeration chamber. The sealing rubber (cuff) on the door wears out over time, cracks, or simply becomes overgrown with a coating that prevents a tight fit. Through the resulting cracks, warm and humid air from the kitchen constantly enters the chamber.
The moisture contained in the incoming air settles on the coldest surfaces - usually the back wall or the area around the evaporator. The compressor, trying to compensate for the heat input, works in increased mode. As a result, the temperature in the chamber drops below normal, and products, especially those lying at the back wall, become covered with an icy crust.
- 🚪 Conduct a visual inspection of the seal around the entire perimeter of the door for cracks and tears.
- 🧼 Wash the rubber band thoroughly with warm water and a mild detergent to remove grease and sticky plaque.
- 📄 Use a test with a sheet of paper: hold the sheet with the door and try to pull it out. If it comes out too easily or falls out, the seal is broken.
Sometimes the problem lies not in the rubber itself, but in the door is skewed. If the refrigerator is not level or the hinges are skewed due to the weight of the food on the door shelves, a tight fit will not be achieved. In this case, even a new seal will not save the situation. It is necessary to adjust the position of the door using the fastening bolts.
It is also worth paying attention to freezer sealif you have a two-chamber refrigerator. Violation of the seal of the freezer can lead to the fact that cold air from it will actively flow into the refrigeration compartment through the overflow channels (in systems No Frost), causing hypothermia there.
☑️ Diagnosis of the seal doors
Malfunctions of the defrosting system and sensors (No Frost)
In refrigerators with a system No Frost the automatic defrosting system plays a critical role. It consists of a heating element (heater), a defrost sensor (thermostat) and a timer (or electronic control module). If any of these elements fails, the evaporator becomes overgrown with ice, which blocks the air circulation channels.
When the air ducts become clogged with ice, cold air stops circulating normally or, conversely, begins to blow directly onto the products with increased intensity during short-term fan operation. As a result, a local “pole of cold” is formed in certain areas of the refrigerator, where food instantly freezes.
The main symptoms of a malfunction in the defrost system:
- 🧊 A layer of snow or ice is visible on the back wall of the refrigerator compartment.
- 🔊 The fan makes noise or makes noise a grinding sound when you try to turn it on.
Most often, the fuse that protects the system from overheating breaks or blows. In this case, the ice does not melt, but grows layer by layer. The evaporator temperature sensor, which should give a command to turn on the heater, may “stick” in the “cold” position, and the control module simply will not start the defrost cycle. Defrost heating element or the fuse that protects the system from overheating blows. In this case, the ice does not melt, but grows layer by layer. The evaporator temperature sensor, which should command the heater to turn on, may “stick” in the “cold” position, and the control module simply will not start the defrost cycle.
⚠️ Attention: Operating the refrigerator with a non-working defrost system leads to freezing of the fan and its subsequent jamming, which can cause the motor to burn out.
To diagnose these components, a multimeter and skills in working with electrical circuits are required. It is necessary to “ring” the heating element for a break, check the defrost sensor and the integrity of the fuse. In modern models LG, Samsung or Bosch a defrost system error is often displayed on the display in the form of a special code.
Error codes for the defrost system
On the displays of some models, codes may appear on the displays of some models indicating a problem. For example, with Samsung it is often Er r or combinations with the letter R (Refrigerator). LG has error codes related to sensors. The exact decoding should always be found in the instructions for a specific model, since the codes may vary depending on the year of manufacture and series.
Clogged capillary tube and leakage of freon
If everything is in order with the settings and seal, and the defrost system is working properly, the reason may lie in the refrigeration circuit. Capillary tube - this is the thinnest copper pipeline in which the refrigerant is throttled. Due to the presence of moisture in the system or oil breakdown products, it may become clogged with ice plugs or debris.
If the blockage is partial, freon passes through with difficulty and evaporation occurs unevenly. This often appears as an "ice tongue" - a build-up of ice only at the beginning of the evaporator, while the rest of the tube remains warm or at room temperature. Products lying opposite this “tongue” will freeze, while in other corners of the chamber it may be warm.
Leakage refrigerant (of freon) also leads to a violation of the temperature regime. If there is a lack of gas, the compressor works almost non-stop, trying to increase the temperature, but cannot do this. In some cases, especially in single-compressor models, this leads to the fact that there is not enough cold in the freezer, and in the refrigerator compartment, on the contrary, everything freezes due to an imbalance in the circulation.
Diagnostics of a leak or blockage requires special equipment: a pressure gauge station and a leak detector. It is almost impossible to independently identify a microcrack or a blockage. The technician evacuates the system, checks it for leaks and, if necessary, replaces the capillary tube or filter drier.
Location of products and violation of rules downloads
Sometimes the equipment is fully operational, but the food freezes due to improper placement. In refrigerators with a No Frost system, cold air is forced through special openings, usually located on the back wall or on top. If you place a pot of soup or a bottle of water directly in front of this hole, the food will freeze, even if the thermostat is set correctly.
In addition, overloading the chamber disrupts the natural or forced circulation of air flow. If the shelves are jam-packed, cold air cannot be evenly distributed throughout the volume. Stagnant zones and zones with increased concentrations of cold are formed. In such “cold pockets” the temperature can drop significantly below the set temperature.
Follow the following placement rules:
- 🥛 Do not place food close to the back wall, leave a gap of 2-3 cm for circulation.
- 🍲 Do not cover the ventilation openings with food or packages.
- 📦 Distribute loads evenly, without creating “walls” of containers across the movement of air.
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