Everything you need to operate the Defensor Mk4 is in this Unit fitting and steam installation, which walks through operating modes, servicing and upkeep and fault and error codes.
Looking up technical specifications, control and indicator descriptions, and also spare parts information? The Defensor PH15 Operating instructions manual is a good place to start.
Defensor PH28 Operating instructions manual — technical specifications, step-by-step operation, together with common questions and answers, all in 48 pages.