Pioneer WYB-GMFI SERIES Service Manual page 49

9.2.2 Indoor unit and outdoor unit communication protection error diagnosis and solution
Power off, then power on the A/C by
the breaker.(reconnect the power
wire). Is the E1 extinguished?
Check the wiring on the outdoor
terminal and indoor terminal follow
the wiring diagram. Is all the
connecting correctly?
-24V<Vs<+24V?
(Vs is the voltage between S and N).
Is the wiring to the outdoor PCB
connecting correctly?
Change the outdoor PCB
Power on. Is the E1 extinguished
after 3 minutes?
Change the indoor PCB
No
Yes
Yes
Yes
No
No
Is the wiring to the indoor PCB
connecting correctly?
Change the indoor PCB
Power on. Is the E1 extinguished
after 3 minutes?
Change the outdoor PCB
47
Yes
No