Service Diagnosis
44
10.4.10 The communication fault between indoor and outdoor
Split board
Indoor display E7 outdoor display LED1 flash 15 times
Communication is detected by checking the indoor PCB and the outdoor PCB.
The outdoor PCB broken leads to communication fault.
The indoor PCB broken leads to communication fault.
Communication wiring disconnected.
The indoor PCB is broken.
The outdoor PCB is broken.
The Power Module is broken.
* Caution: Be sure to turn off power switch before connect or disconnect connector,
or else parts damage may be occurred.
Supposed
Causes
Malfunction
Decision
Conditions
Method of
Malfunction
Detection
Is it normal after restart
the AC?
If starting up
normally, but
malfunction occurs
again after a while
Check whether the linking cable
between the indoor and outdoor
is well connected or whether its
core wires are well insulated or
its L/N is not reversed.
Reconnect the
connecting
cable or replace
with a new one.
The outdoor PCB needs
dust
The outdoor PCB needs
dehumidification
YES
NO
NO
NO
YES
YES
Trouble
shooting
