Malfunction Posted on 7th December 20157th April 2021 by ThePD (The Project Definition) Malfunction is to fail to work or operate correctly. Related Definitions in the Project: The Operation and Maintenance Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Operation and tagged maintenance, operation. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.