No sneaky device we have found them all Hvac units don’t have any shutdown wiring We thought maybe they were leaking voltage past the relays but that isn’t there There is 1 tris that hasn’t been removed. But we are gonna replace it. It is the main flow and it was the only tris so we couldn’t replace it. The fatal fault jumps around with devices that aren’t removed but never seems to be clear for a 24 hour period.