hi green pants, just a question. we picked up a otis 2 sp ac with a ovf mod that wont drive on maintenance. we believe some supterfuge MAY have happened. we went thru the parameters and when you try to drive the drive drops out. all seem ok until you try to drive. is there a parameter that you can turn off or pull a wire that will affect this? normal service works fine. sorry to throw this at you on this thread but i thought it was applicable as we are talking about ovf's.its exactly the same on both lifts.