Hitachi RAS-5HVRNM1E Service Manual page 257

8 Troubleshooting
38
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 when AC 220V or 240V is supplied to voltage PCN9#1 and #3 on PCB1 in the outdoor
unit during CMC is opened.
Is 220VAC or 240VAC
applied PCN9#1 and #3 during
stoppage?
Yes
PCB1 is normal
Phenomenon
Faulty PCB1
249
SMGB0060 rev. 1- 12/2010
Abnormality of Protective Circuit for Protection (Outdoor Unit) for IVX Series
No
Faulty PCB1.
Check wiring
connection
except PCB1.
Cause
Check PCB1 by seft-checking
N14 CN15 PCN10 PCN13
SEG1
DSW1
PSW2
PSW3
PSW1
Check item
(Turn OFF main switch)
PCN8
PCN9
Y52C
Y20A
Y21
YCH
Action
Replace PCB1
8