I just started having a problem with the same type unit. System has EZ Scan built in. (No info on how to use or know what I/O is reference to) Code to access on site.
Problem:
Door operation fails: No door open. ECI/GAL Canada door operator. Tried replace of door control card and replaced DCL/Dol micro switches. When door fails to open EZ Scan shows Both DOL & DCL on. (NOT right)
I have seen car at rest/ no calls placed/ door closed and locked: DCL/DOL on: then DCL drops. ?? Observed this 2X.
ANY thoughts or help.