4. Communication malfunction E6
Start
Cut off power, check if the wire
between indoor unit and outdoor
unit, and the wire inside electric
box are connected correctly
Connected correctly?
No
No
No
No
No
No
No
End
Yes
Yes
Yes
Yes
Yes
Yes
Malfunction is
eliminated
Malfunction is
eliminated
Malfunction is
eliminated
Malfunction is
eliminated
Replace outdoor
mainboard
Replace indoor
mainboard
Communication wire
connection is broken?
Replace the
wire
Is there incorrect
match between the mainboard
and the display panel or between
the indoor and outdoor
mainboards?
Match them
according to
the requirement
Reconnect the wire
according to
wiring diagram
Yes
8
5
Service Manual
Installation and Maintenance