Various signs appearing on Siemens dryers

01 means the door is not closed, 02 means the roller cannot be opened, and 03 means the door lock enters self-protection. The instructions for use of the Siemens dryer show that 01 means that the door is not closed, 02 means that the drum cannot be opened, and 03 means that the door lock has entered self-protection. Founded in 1847, Siemens AG is a global leader in electronic and electrical engineering.