Daikin FAY71LVE - 3.97 U9 Transmission Error Between Indoor and Outdoor Units in the Same System

Si20-701_B Troubleshooting by Remote Controller
414
External control adaptor for outdoor unit
•Is this PCB energized?
•Does the cool/heat unified address match?
Outdoor unit (unified master unit)
•Is this energized?
•Does the cool/heat unified address match?
Does an
error occur when
the cool / heat selector
is set to "IND?"
Replace the
external control
adaptor for
outdoor unit.
Replace the
outdoor unit PCB
(A1P).
NO
A
B
YES
YES