I had an Air Con unit installed in the Living Room and another in a bedroom adjacent to the Living Room, both from the same brand. The Air Con units are actually next to each other, and only separated by a wall that has a doorway just 3 feet from the Air Cons.
Most of the time, when I am on the couch and turn on the Air Con in the Living Room using the Remote Control, it also turns on the Air Con in the bedroom, which is a waste of energy. Likewise, when I am in the bedroom and turn on the Air Con in the bedroom with its Remote Control, most of the time it also turns on the Air Con in the Living Room, which is also a waste of energy.
How can I fix this very frustrating problem without moving the units and without having to keep the door always closed between the bedroom and the Living Room?
EDIT: As requested, the 2 indoor units that are interfering are the Daikin FTXS20K and the Daikin FTXS35K: http://www.daikin.co.uk/products/index.jsp?singleprv=FTXS-K