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Carrier cassette AC use two types of filters: electrostatic and carbon. A clean filter is essential for the correct operation of AC. The dirtier the filter, the worse the air will be cleaned. Filters should be cleaned based on the degree of contamination of the processed air. So, if the air is clean enough, then the service interval of electrostatic filters can be several months. In polluted air - several weeks.
The more-dirty the electrostatic filter, the more noise it creates. If during the operation of the air conditioner you notice not only increased noise, but also sparking, then it is time to clean the filter or even change it.
In case of poor cooling by the AC, it is necessary to call the AC repairman - the technician must carry out diagnostics, measure the freon pressure in the system, check the AC for leaks and clogging of filters. If necessary, refuel or service the AC.