I have very little experiance with these things, as they are just now comming about in our area.
I just know they are a pain in the A$$!!!
I went to one last week, remote working (Showing that it is putting out a signal anyway, how do you check to see if it is really beaming the signal??) Anyway, the display and everything on the remote worked, but no response at the unit. No beeping, nothing.
Called tech support. (To ask where I start, hell even though the remote says it is working, again, how do I know it is beaming the signal?) Tech support says to order and replace the main pcb board and remote sensor board. (Both come together as a package.)
Ordered the board, get to the job and realized they sent me the POWER board instead of the main PCB board.
I realized this after I opened up the unit. Got to looking at the unit to figure out how the hell I'm going to change this board. Everything is JAM PACKED in to this tiny ass compartment. It reminded me of a compact front wheel drive car with the engine mounted sideways and everything just packed in wherever it could go. I almost have to take the unit completely apart when I do get the right boards for it. WTF?
So I go to put the cover back on, and discovered that that was a chore itself. Trying to get the whole thing lined up and getting all 4 clips on top to align and snap into place was no easy task.
I have only worked on 4 or 5 of these in the past, once was actually an installation. After finally getting the indoor section connected, it was a chore just getting it to stay mounted FLESH to the wall without comming like an inch away from the wall. Then I finally get it mounted right and find that the lower right hand corner piece (Fujitsu unit, there is a corner piece of trimming that covers part of the bottom and the right side of the unit) just would not snap into place.
From what little experiance I have with them, all I can say is MINI SPLITS SUCK!!!!