DTC 522781-3 - MONOTROL REV Switch OORH
check the switch, the wiring for shorts or opens
worse case scenario is the controller has failed
as for bypassing the error on startup?
don't know of a way other than hooking up the laptop
have you tried accessing the display diagnostics while turning the unit on instead of waiting for it? Just a longshot but generally the system has to be fully initialized before it will let you access the diagnostic screens.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.