Upstairs unit is 1996 R22, outside coils are clogged, also low Freon, downstairs unit is 2013 communicating system. Wire on outdoor unit shorted causing indoor board to be faulty, the outside board may also be faulty, cannot see until indoor is repaired. Owners said that Freon has been added in past to downstairs unit before. Pictures of units and model number and indoor board included. Comfort specialist coming tomorrow to quote replacement of both units.