Hitachi RAS-2-HVNP Service Manual page 221

8. Troubleshooting
05
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 the main power source phase is reversely connected or one phase is not connected.
Single phase
and 3 phases
(Is there any phase
which is not connec-
ted)?
Reverse phase connection
(Only 3 phases unit)
RAS-(2-6)HVN(P/C)(E)
Voltage for unit to
be suspended
Setting voltage:
Less than 187V
Phenomenon
Activation of
reverse phase
sensor in the
outdoor unit
207
SMGB0079 rev.0 - 01/2013
Code abnormal operation of picking up phase signal
Yes
PCB1 is normal
No
Yes
PCB1 is normal
No
Running voltage:
207 to 253V
Cause
Reverse or single phase
Faulty outdoor unit PCB
Correctly connect each
phase of the power
Correctly connect each
phase of the power
Faulty PCB1 or other
(see below)
RAS-(4-12)HN(P/C)(E)
Voltage for unit to
be suspended
Setting voltage:
Less than 323V
Check item
Check it according to Replacing wires, repair, tighte-
the electrical wiring
-
source
source
cause
Running voltage:
342 to 456V
Action
(Turn OFF the main switch)
ning screws or correct wiring
Replace PCB if faulty
8