Hitachi RAS-2-HVNP Service Manual page 218

8. Troubleshooting
04
Alarm code
• The RUN LED flickers and "ALARM" is displayed on the remote control switch.
• The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit
number and the alarm code are displayed on the display of the outdoor unit PCB.
- This alarm is displayed when the abnormal operation is maintained for 30 seconds after the normal transmission
between the outdoor unit PCB1 and inverter PCB2. Also, the abnormal operation is maintained for 30 seconds after
the micro-computer is automatically reset. The alarm is displayed when the abnormal transmission is maintained
for 30 seconds from the starting of the outdoor unit.
RAS-(2-2.5)HVNP / RAS-3HVNC / RAS-(4-6)H(V)NCE
204
SMGB0079 rev.0 - 01/2013
Abnormal transmission between Inverter PCB and Outdoor PCB1