Haier AV10IMWEWA Design, Installation & Maintenance Instruction page 262

[07]communication abnormal between indoor and wired controller
if wiring of terminal A, B, C of
wired controller is proper
if there is broken wire or port is
fixed improperly
if in group operation
if there is indoo r unit
set as No. 0
if indoor unit is running
yes
no
no
if there are multi indoors
no
yes
if LED2 on indoor PCB is ON,
yes
which indicates the serial sign al
sent to wired controlle r
if LED1 on indoor PCB is ON,
which indicates the serial signal
sent from wired controller
no
modify the wiring
yes
modify the connection
if there is indoor unit
set as No. 0
set as No. 0
no
no
no
no
261
set one indoor
no
unit as No. 0
yes
set only one indoor
unit as No. 0
set one indoor
unit as No. 0
yes
check indoor PCB, if
faulty , replace it
yes
check wired controller
PCB, if faulty, replace it