The present disclosure provides a method for operating an HVAC system for conditioning air of an inside space. A voltage obtained by dividing the input voltage using resistors is output from the excess voltage protection circuit. The dielectric layer includes at least one fuse therein and the crack stop void is adjacent to two opposite sides of the fuse, and extends lower than a bottom surface and above a top surface of the fuse. A surface layer of the resist pattern R is swollen by the solvent vapor combined with the water molecules m to achieve a smoothing process.