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There are many reasons. The first thing to check is the filters as it is necessary to clean the filters twice a year.
The first action we have to give to an electronic error is to cut the electricity supply for 5 clock minutes, this allows you to erase the memory, that is, we are going to do a reset.
The temperature for proper operation avoiding excess energy consumption, in summer it will not be less than 26º and in winter it will not exceed 21º.
As a standard, the life of an air conditioner is 10-15 years. However, a very high percentage, with good maintenance, can reach 20 years, even more.
The most common reason is that in the drain and have a lid, either by crumb caused by dust in the environment, the solution is to intercept the drain somewhere in between and blow to be able to discover.
As we mentioned in the previous question, it is always a clog at some point in the drain. In the case of the compressor (external unit) it is almost always the failure of the pipette that carries in the lower part of the unit, due to environmental contamination.
When we detect that the internal unit has a layer of ice on the battery, we have two possible problems: either we lack gas or we have a clogged roller / fan. In any case, we recommend that you contact professionals. We will be happy to help you.