Hitachi RAS-(3-6)HVNC1(E) - Page 246

8 Troubleshooting
232
SMGB0087 rev.0 - 12/2013
RAS-(3-6)H(V)NP1E
No
In case fuse melted,
replace fuse.
Check the cause of
melting
Remove the connector CN6 on
PCB1. Power source ON
Yes
Yes
No
Is fuse (EF1 or EF2)
of outdoor unit normal?
Yes
Is LED2 (green) on
OU PCB1 ashing?
Reconnect the connector CN6 on
OU PCB1
Normal IPM.
Check the electrical wiring again.
Power source OFF
Faulty OU PCB1
No (LED2 ON or OFF)
No (LED2 remains ON or OFF)
Is LED2 (green) on
OU PCB1 ashing?
Yes
Does ashing speed
become faster than before?
Remove the connectors
PCn201/202 and CN201/202 on
inverter PCB
Power source ON
Is LED2 (green) on
OU PCB1 ashing?
Yes
Does ashing speed
become faster than before?
Yes
Normal Inverter PCB.
Faulty fan motor.
No (LED2 ON or OFF)
Faulty inverter PCB
Incorrect wiring
No
Are resistances
R115 and R116 for
inrush current prevention on
inverter PCB normal?
No
Faulty DC fan motor
Faulty inverter PCB
*1)
Faulty DC fan motor
Replace fuses (EF1)
Are fuses “EF1”
on OU PCB1 and
“EF1” on inverter PCB
for fan motor protection
normal?
Is DC fan motor
normal? Check it
by trobleshooting at item
Checking method of DC fan
motor for outdoor unit
Abnormal
*3)
*2)
Normal
Normal
Faulty inverter PCB
Incorrect wiring
Faulty DC fan motor
Yes
N O T E
• *1): Surely perform the troubleshooting of the resistance for inrush current prevention (R115/R116) on inverter PCB. If
the resistance for inrush current prevention (R115/R116) fails, the abnormal transmitting occurs.
• *2): Surely perform the troubleshooting of DC fan motor according to section “8.4 Checking procedure for main parts”.
If the DC fan motor fails, the normal inverter PCB may be damaged.
• *3): Perform the troubleshooting of the fuses “EF1” on OU PCB1 and “EF1” on inverter PCB for fan motor protection. If
the fuses for fan motor protection fail, DC fan motor is not operated normally.