Before activating the hairdryer, make sure that it has been used without the lock function, i.e. without having placed the switch on the padlock symbol. Therefore, to start the auto-cleaning procedure, you must have run the hairdryer for a few seconds with any speed and temperature setting. Otherwise, auto-cleaning will not start. To activate the self-cleaning function, the hairdryer must be switched off in position 0. The self-cleaning function allows you to clean the internal components of the hairdryer: read the paragraph “AUTO-CLEAN FUNCTION” in the user manual or watch our video about it by clicking here.