Hitachi FSXN Series Service Manual page 215

8 Troubleshooting
36
Alarm code
• The RUN indicator flashes and the ALARM indication is displayed on the remote control switch.
• The unit no., the alarm code and the unit code are alternatively displayed in the temperature setting section and the unit
no. and alarm code are displayed on the outdoor unit's PCB1 display.
*This alarm is indicated when the indoor unit connected to the outdoor unit is designed for R22 refrigerant.
209
SMGB0065 rev. 1 - 12/2010
Incorrect indoor unit combination.
8