is it possible, kinda like graham said, that the unit is not square always? maybe building sway tends to take it out of alignment? (i'm reaching for the sky on this one, but who knows! )
i am not trying to put the blame on everybody but Trane. i am just trying to help open up some other possibilities. i have not heard of an epidemic on the coils. like i said, just certain ones seem to be more prone, but i have never investigated the real reason. only happens when they need it running and i can not shut it down to find out why.