Hitachi UTOPIA RAS-4HVRP2E - Checking Procedure for Main Parts; Checking Procedure for the PCB; Ras-3 Hvrc2

10 Troubleshooting
Checking procedure for main parts
SMGB0136 rev.0 - 07/2021
308
10.4 Checking procedure for main parts
10.4.1 RAS-3HVRC2
10.4.1.1 Checking procedure for the PCB
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
DC310/340V (For power
supply circuit: 1~230V) is
applied to P1 and VDC-2.
*1)
DC310/340V (For power
supply circuit: 1~230V) is
applied to P1 and VDC-2.
*1)
LED 1 is ON?
AC5V is applied between
VCC05 and GND1. *1
DC13V is applied
between VCC12 and
GND1. *1
DC15V is applied
between VCC15-1 and
VDC-2. *1
No
No
No
No
No
No
No
No
No
No
Turn ON outdoor unit
DC280V system is normal
DC5V system is normal
DC12V system is normal
Check is completed.
Power circuit is normal.
Failure of DC power circuit of
OU PCB
Failure of DC power circuit of
OU PCB
Failure of DC power circuit of
OU PCB
Voltage is normal.
LED1 is faulty
Failure of AC power circuit of
OU PCB or fan motor *2
Failure of AC Power Circuit of
OU PCB or fan motor
Connect PCN406.
Return to 
Voltage is normal.
LED4 is faulty
LED 4 is ON?
Fuse PF1 / PF4 /EFR1 are
blowout
PCN406 is disconnected
AC5V is applied between
VCC05 and GND1. *1

? NOTE
• *1) The following table shows the check points and the normal range of voltage in the case that the voltage on the outdoor unit PCB
is measured with a circuit tester. The setting of the circuit tester shall be set within the DC voltage measurement range when the fol-
lowing voltages are measured.
• *2) If 230V / 400V is present in DIP-IPM terminals R-S / R-S-T, DIP-IPM may be faulty. Alarm 03 may be shown in this case.