Haier AU052FPERA - [26-0, 26-1, 26-2] Communication circuit between indoor and outdoor

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If indoor and outdoor are
electried at the same time
If indoor quantity is correct
(check by rotary switch)
If failure disappears after
changing indoor PCB
Electromagnetic interference
Check outdoor PCB, if faulty, replace it
If communication wire is separate
from high-voltage wire on layout
Connect power source
Change communication wiring type
Shut off power supply, and outdoor
searches for indoors again
Eliminate electromagnetic interference
No
No
No
No
No
Yes
Yes
Yes
Yes
If wiring between P and Q
is wrong or broken down
If wire of on outdoor
connecting board is normal
If the wire on indoor
PCB is normal
Modify the communication wire
Modify the port
No
No
No
Yes
Yes
Yes
[26-0, 26-1, 26-2] Communication circuit between indoor and outdoor