Hitachi RAS-2-HVNP Service Manual page 264

8. Troubleshooting
EE
Alarm code
• This alarm code is displayed when one of the following alarms occurs three times within six hours. If the outdoor unit
operates continuously without removing the cause of the alarm, the compressor may be seriously damaged
You can check these alarms using the check mode 1. Follow the action that is indicated in each alarm chart. You can clear
these alarms only by turning OFF the main switch to the system. However, you must pay careful attention before start-
ing, because there is a possibility of causing serious damages to the compressors.
b0
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 code is indicated in the following condition. Check the unit model code setting (DSW4) of I.U. PCB after
-
turning OFF the power source.
The unit model code setting (DSW4) is not set (all
pins are "OFF"), or is set for the incorrect indoor
unit type.
250
SMGB0079 rev.0 - 01/2013
Alarm code Content of abnormality
02 Tripping of protection device in outdoor unit
07 Decrease in discharge gas superheat
08 Increase in discharge gas temperature
45 Activation of high pressure increase protection device
47 Low pressure decrease protection activating
Incorrect Setting of Unit Model Code
Condition
Compressor protection
Action
Set DSW4 correctly according to the dip switch
setting in "Installation and Maintenance Manual".