York Pyrenees YM9FXC030BAA FX Series Service Manual page 28

8.2.5 Refrigerant Leakage Detection diagnosis and solution
Power off, then restart the
unit 2 minutes later.
Yes
Check cool air blowing out
Check if T2 sensor
Yes
from indoor air outlet
Yes
No
Replace indoor PCB.
Check leakage of system
No
Yes
Repair the leakage and
recharge the refrigerant.
check blockIng of system and
clear the blocking