Haier AB072MRERA - Page 645

637
Troubleshooting
[07] Communication abnormal between indoor and wired controller
If wiring of terminal A, B, C of
wired controller is proper
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
NoNo
No
No
No
No
Modify the wiring
Modify the connection
If the broken wire or port is
xed improperly
If in group operation
If there is indoor unit
set as No. 0
Set one indoor
unit as No. 0
Set only one indoor
unit as No. 0
Set one indoor
unit as No. 0
If there is indoor unit
set as No. 0
If there are multi indoors
set as No. 0
If indoor unit is running
Check indoor PCB, if
faulty, replace it
If LED2 on indoor PCB is ON,
which indicate the serial signal
sent to wired controller
If LED1 on indoor PCB is ON,
which indicate the serial signal
sent to wired controller
Check wired controller
PCB, if faulty, replace it