Beko WME7267W won't clear E05 error or enter test mode?

After dismantling and cleaning pump and connecting rubber tubes, door seal and detergent tray, etc. I've put everything back and attempted to do reset by closing door, holding down start and turning power switch on. It displays E05 and then test screen when I release start button, but does not then step thru test modes when pressing start. Turning power on and off displays a flashing play button and only shows spin/temp settings when dial at 90º.

Am I supposed to do another step to clear the E05 error?
Many thanks