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[26-0, 26-1, 26-2] Communication circuit between indoor and outdoor
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
If indoor and outdoor are
electrified at the same time
If communication wire is separate
from high-voltage wire on layout
If indoor quantity is correct
(check by rotary switch)
Electromagnetic interference
If failure disappears after
changing indoor PCB
Check outdoor PCB, if faulty, replace it
No
Yes
Yes
Yes
Yes
No
No
No
Yes
Modify the communication wire
No
No
No
Connect power source
No
Change communication wiring type
Yes
Shut off power supply, and outdoor
searches for indoors again
Yes
Eliminate electromagnetic interference
47
Modify the port
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