The situation when Biryusa refrigerator it goes into defrost mode on its own often takes owners by surprise. Instead of maintaining cold, the unit begins to warm up, and condensation or ice appears on the walls. This does not always indicate a critical breakdown of the compressor or a freon leak.
Modern models equipped with the system No Frosthave programmed defrost cycles, which can be mistaken for a failure. However, if defrosting occurs too often or lasts an unreasonably long time, you need to look for the cause in electronics or mechanical elements.
In this article we will look in detail at why your unit is behaving strangely, how to distinguish normal operation from a malfunction and what steps to take to restore normal cooling mode without calling a technician.
The principle of operation of the automatic defrosting system
Understanding how it works defrost systemwill help you not to panic ahead of time. In models with full No Frost the evaporator is hidden behind the back wall of the freezer. Periodically, usually every 8–12 hours of compressor operation, the unit forcibly stops cooling.
At this moment, a special Heating element (heating element) is turned on, which melts the frost frozen on the evaporator. The water flows into the drain pan and evaporates. If you hear a murmur or see that the refrigerator is “resting” at this time, this is normal mode.
However, there is the concept of a “crying” evaporator in single-compressor models. Here, moisture accumulates on the rear wall of the refrigerator compartment and flows down. If you notice that defrosting happens chaotically, the controller settings may have gone wrong.
⚠️ Attention: If during normal defrosting the temperature in the main chamber rises above +10°C and lasts more than 2 hours, this is a sign of a thermostat malfunction or loss circuit tightness.
It is important to distinguish between the normal cycle and emergency reset. In the first case, the process takes 15–20 minutes, in the second, the unit can stand warm for several hours, trying unsuccessfully to gain temperature.
Failures of temperature sensors and timers
One of the most common reasons why Biryusa refrigerator it defrosts itself is the failure of the defrost sensor. This small element controls the temperature of the evaporator. If it “lies” and shows that the evaporator is too hot or, conversely, cold, the controller may mistakenly start or interrupt the defrost cycle.
The second suspect is defrost timer (or its electronic equivalent in the control module). In older models, this is a mechanical device that wears out over time. The contacts get stuck and the unit gets stuck in defrost standby mode, ignoring the command to cool.
Diagnostics of these elements requires a multimeter. It is necessary to “ring” the circuit for an open or short circuit. Often the problem lies not in the sensor itself, but in the oxidized contacts of the wiring going to it.
How to check the sensor with a multimeter?
To check the defrost sensor, you need to remove it and place it in a container with warm water (about 40-50°C). The resistance of a working sensor should change. If the readings on the device screen do not change, the element requires replacement.
It is also worth paying attention to control module. Power surges in the network could damage the electronic components responsible for switching modes. Visually, traces of burning or swollen capacitors may be visible on the board.
Problems with the heating element and drainage system
If the heating element Heating element burns out, the ice on the evaporator does not melt. Over time, the “fur coat” becomes so thick that it blocks the air circulation channels. As a result, the temperature sensor cannot correctly read the readings, and the refrigerator goes into emergency mode or chaotically tries to defrost.
A clogged drainage channel is another cause of failures. Water from melting ice does not drain away, freezes in the drainage hole and blocks the operation of the system. The unit “thinks” that the defrosting was not successful and may repeatedly start a heating cycle, which appears as a constant defrosting.
Using a soft wire or a syringe with warm water is often enough to clear the drain. Mechanical damage to the water collection tray can also lead to leaks, which users mistakenly mistake for the result of self-defrosting.
☑️ Diagnostics of the defrost system
Pay attention to the condition rubber seal doors. If it allows warm air to pass through, the moisture actively condenses and freezes, creating an excessive load on the defrost system.
Failures in the electronic control module
Modern Biryusa refrigerators are controlled by complex electronics. A software glitch or a failure in the controller's memory can lead to the operation algorithm being disrupted. The unit can endlessly cycle on and off the defrost mode.
A simple reset settings (reset) often helps. To do this, you need to disconnect the refrigerator from the power supply for 15–20 minutes. This will allow the capacitors to discharge and the controller memory to be cleared of temporary errors.
If the problem persists after switching on, the module may need to be re-flashed or completely replaced. On models with a display on the door, error codes may light up indicating a specific component. The decoding of the codes can be found in the user manual.
| Symptom | Probable cause | Elimination method |
|---|---|---|
| Humming, but no cold | Malfunction fan | Replacing the blower fan |
| Ice on the back wall | Failure of the defrost sensor | Replacing the sensor |
| Water on the floor | Drainage clogged | Cleaning the drainage channel |
| Chaotic switching on | Control module failure | Restart or replace the board |
Do not ignore recurring electronics failures. A module operating with errors can eventually damage the compressor, the cost of replacing which is much higher than repairing the board.
The influence of external factors and operating conditions
Sometimes the reason that refrigerator behaves strangely lies not in its internals, but in environmental conditions. Installing the unit near heating appliances or in direct sunlight causes it to work with overload.
The temperature in the room also plays a role. If the room is too cold (below +10°C) or too hot (above +32°C), the thermostat may not work correctly, giving erroneous signals to start defrosting or the compressor.
Unstable voltage in the electrical network is the scourge of many regions. Voltage surges can “confuse” the electronic brains of the device. Using a surge protector or voltage stabilizer will help prolong the life of the equipment.
⚠️ Attention: Installing a refrigerator in an unheated room (garage, balcony) in winter can lead to freezing of the oil in the compressor and incorrect operation of the refrigerant, which will cause false signals about the need for defrosting.
Independent algorithm diagnostics
Before calling a technician, try to conduct an initial diagnosis on your own. This will help save time and more accurately describe the problem to a specialist. Start with a visual inspection and listening to the operation of the unit.
Check the tightness of the door. A sheet of paper sandwiched between the door and the body must be removed with force along the entire perimeter. If the paper falls out freely, the seal requires replacement or adjustment of the hinges.
Evaluate the nature of the noise. Humming, gurgling or clicking noises may be normal, but a high-pitched whistling or knocking noise indicates problems with the compressor or fan, which indirectly affects defrost cycles.
If you find mechanical damage, traces of rust on the evaporator or a burning smell, it is better to stop further use until a specialist arrives. Self-repair of complex components without skills can be dangerous.
When you need to call a specialist
There are a number of situations when DIY repairs are impractical or dangerous. If after defrosting for 24 hours refrigerator the temperature has not reached, there may be a freon leak. Only a technician with the equipment can determine the location of the leak and refill the system.
Replacing the compressor, sealing tubes and working with high-voltage electrical circuits require qualifications. Unqualified intervention can lead to electric shock or fire.
It is also worth contacting service if the unit is under warranty. Opening seals or doing your own repairs will deprive you of the right to free service.
Remember that regular maintenance extends the life of the equipment. Once a year, it is recommended to completely defrost and clean the refrigerator, even if it is equipped with a system. No Frost.
Frequently asked questions (FAQ)
How long should a standard defrost last in Biryusa?
Usually the defrost cycle takes from 15 to 30 minutes. During this time the compressor does not work. If the process lasts more than an hour, this is a sign of a malfunction.
Is it possible to use the refrigerator if it is constantly defrosting?
For a short time it is possible, but the food may spoil due to a violation of the temperature regime. Long-term operation in this mode will lead to damage to the compressor.
Why does the refrigerator not turn on for a long time after defrosting?
This may be protecting the compressor. He needs time for the pressure in the system to equalize. If the pause lasts more than 2 hours, check the thermostat.
Is it necessary to defrost the Biryusa No Frost refrigerator manually?
The manufacturer recommends preventative defrosting and washing at least once a year, even for models with full No Frostto remove bacteria and odors.
What does a flashing temperature indicator mean?
A flashing indicator usually signals that the temperature in the chamber has risen above the permissible limit. This may be a consequence of frequent defrosting or a malfunction.