York Pyrenees YM9FXC030BAA FX Series Service Manual page 25

8.2.2 Zero crossing detection error diagnosis and solution
Power off, then restart the
unit 2 minutes later
Yes
Indoor main PCB is
defective. Replace indoor
main PCB.
8.2.3 Indoor fan speed has been out of control diagnosis and solution
Power off, then restart the
unit 2 minutes later
Yes
Shut off the power supply,
Rotate the fan by hand.
Yes
Check the wiring of fan
motor
Yes
Measure the voltage for the
fan motor from the main
PCB
Yes
Replace the fan motor
No The unit operates normally.
Find out the cause and have
No
Correct the connections.
No
No Replace the main PCB
No
it solved