Hitachi RAS-2-HVNP Service Manual page 211

8. Troubleshooting
03
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 an abnormal operation is maintained for three minutes after the normal transmission
between the indoor units and the outdoor unit. Also, an 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 out-
door unit.
- Investigate the cause of the overcurrent and take the necessary action when the fuses are blown out or the breaker
for the outdoor unit is activated.
197
SMGB0079 rev.0 - 01/2013
Abnormal transmission between the indoor units and the outdoor unit for
RAS-(2-2.5)HVNP / RAS-3HVNC
8