I have an ASH Dome with the automation kit from Astronomical Consultants and Equipment (ACE SmartDome).

Although my dome doesn't have any elevation capability, when it is slaved in ACP, I consistently get a Refresh Timer Exception when I point the telescope such that a dome elevation less than zero is required. For example, when I want to park the telescope in a service position to install/remove mirror covers etc.

SmartDome does have an "accept elevation" setting, which I have set to zero, but I still see the dome driver getting elevation requests and I still get the error. They are unable to reproduce the error at ACE. Any ideas?