Fujitsu AIRSTAGE V-II - Slave Unit Error

Slave Unit Error
I
Slave Unit
Error signal rece ived from slave unit of same refrigerant system
Check Point 1 : Check the slave unit
Slave unit 7 seg display check
Check by troubleshooting based on displayed error code.
Indoor Unit : No display
Outdoor Unit : E. 9U. 2
Error Code : 9U
04-59
Trouble shooting 51
Indicate or Display:
Detective Actuators:
Detective details:
OUTDOOR UNIT Error Method: