My air purifier is making an electrical clicking noise causing a burning smell. What should I do?

This means that the filter is clogged and that large dust particles in contact with the electric field cause a short circuit. Just like mosquitoes that pass near electric traps, this causes a clicking sound. There is nothing dangerous, but you must go through the "maintenance" phase of your air purifier by cleaning the HPP filter according to the user manual. Also remember to check that the pre-filter and carbon filter are recent.