I don't know what you mean "an external connection to the error signal". The error LED is on the board and the connections are per your instructions.
Also don't know what you mean "orange" light. Looking at the board there are 3 LED's - your documentation says the one on the left is the error LED and it is Red. Never heard of an orange one.
Had short (30 minute cruise) two days ago. Anchored and ran off house batteries - ran them down to 60% - short cruise back. Regulator still working fine, batteries charged a bit on the return leg and error LED stayed on from the time I left the dock to the time I returned.
Maybe I should try another reboot????