Haier MRV S II - Communication Circuit between Indoor and Outdoor

6060
If wiring between P and Q
is wrong or broken down
If wire of CN29 on outdoor
connecting board is normal
If wire of CN15 outdoor
connecting board is normal
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
If there is noise source
Check outdoor PCB, if faulty, replace it
If communication wire is separate
from high-voltage wire on layout
Modify the communication wire
Modify the port
Connect power source
Change communication wiring type
Shut off power supply, and outdoor
searches for indoors again
Eliminate noise source
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
[26-0, 26-1, 26-2] Communication circuit between indoor and outdoor