Hitachi RAS-2-HVNP Service Manual page 261

8. Troubleshooting
57
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 indicated when the revolution pulse output from the fan motor is lower than
and it stops. Regarding stops, when less than 35 seconds have passed since fan start up, after the first abnormality
is detected, if its occurs 4 times more within 5 minutes, it stops and alarm is displayed..
247
SMGB0079 rev.0 - 01/2013
Abnormality of fan motor protection (DC fan motor) for RAS-(2-2.5)HVNP and RAS-3HVNC
20min
-1
during 30 seconds
8