Hitachi RAS-(4-12)HNP(1)(E) - Abnormal Transmission between Inverter PCB and Outdoor PCB1

8 Troubleshooting
231
SMGB0087 rev.0 - 12/2013
8
Alarm code
04
Abnormal transmission between Inverter PCB and Outdoor PCB1
- This alarm is displayed when the abnormal operation is maintained for 30 seconds after the normal transmission
between the outdoor unit PCB1 and inverter PCB2. Also, the abnormal operation is maintained for 30 seconds after
the micro-computer is automatically reset. The alarm is displayed when the abnormal transmission is maintained
for 30 seconds from the starting of the outdoor unit.
RAS-(2-2.5)HVNP1 / RAS-3HVNC1 / RAS-(4-6)H(V)NC1E
Replace fuse if blown
Yes
Turn ON the power supply
No
Faulty PCB or faulty DC fan
motor
Note: investigate the cause
of fuse blown
LED2 is ON or OFF
Is power fuse for
outdoor unit (PF1 or
PF2) normal?
Yes
Is LED2 (green)
on PCB ON/OFF/
ashing?
ashing
PCB is normal