Yeah, if someone has access to the service manual, interpreting the fault code is your best bet.
Given almost all power electrics on later Hotpoint/Indesit dishwashers like this one are in the base, a fault code is unlikely to indicate a wiring fault in the door.
All base-mounted power modules on Hotpoint/Indesit dishwashers like this come unprogrammed and require a software upload. But personally, with a fault code displayed, a fault with the electronics is the last thing I would suspect