Hitachi EV-1.5N1, Service Manual

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