Hitachi RAS-2-HVNP Service Manual page 252

8. Troubleshooting
53
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.
- ISPM has a detection function of the abnormal operation. This alarm is displayed when the ISPM module detects
the abnormal operation 7 times or more than 7 times in 30 minutes. The retry operation is performed six times.
Conditions:
• The abnormal current to the ISPM, such as short-circuited, grounded, overcurrent or control voltage decrease.
N O T E
• *1) Regarding replacing or checking method for ISPM, refer to item Procedure of checking other main parts.
• *2) Set the #1 pin of DIP switch on ISPM to ON when you are restarting with the terminals of the compressor
disconnected. After the troubleshooting, set #1 pin of DIP switch DSW1 on ISPM to OFF.
238
SMGB0079 rev.0 - 01/2013
Activation of transistor module (RAS-(2-2.5)HVNP / RAS-3HVNC)
Replace electrical box