i know as an approved installer any approval falls onto them on all kit installed. ie your nsi cert makes you liable for all approvals, assuming what you fitted is compliant at the very least puts that compliance claim back on the installer
cg what responses have you had from csl regarding this?
its a bit over my head but can the unit be defeated in the field without access to the unit itself?
id also meter both sides of the fuse and 0v to ensure its not a fuse issue. Discconect the aux terminals. If new id suggest you havem a short on the aux side.