Hitachi RAS-2-HVNP Service Manual page 249

8. Troubleshooting
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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 displayed when the current transformer is abnormal (0 A detection or 3 A alarm condition) and
-
the alarm has more than three occurrences in 30 minutes.
- Condition of Activation:
Š When the frequency of the compressor is maintained at 6~10 Hz after the compressor is started, one of the
absolute values of the running current at each phase U+, U-, V+ and V- is less than 1.5 A (including 1.5A)
Š Before the compressor is operated (at the end of position control), the current wave value is less than 3.0 A
N O T E
• *1) P7 is shown at 7-segment on the outdoor unit PCB.
• *2) Make sure LED1 is OFF.
235
SMGB0079 rev.0 - 01/2013
Abnormal operation of the current sensor (RAS-(2-2.5)HVNP / RAS-3HVNC)
Check the PCB1.
Faulty PCB1.
Replace EBOX. *2)
Replace the PCB1. *2)
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