Hitachi RPI-0.8FSG1 Service Manual page 86

TROUBLESHOOTING
Alarm
Code
G "RUN" light flickers and "ALARM" is indicated on the remote control switch.
G The unit No., alarm code and the unit code is alternately indicated on the set temperature section,
and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.
# This alarm code is indicated when a current value of AC chopper becomes (1) less than 0.5A when
outdoor unit fan is operating, or (2) more than 2A while outdoor unit fan stops.
Is outdoor unit fan operating
during the indication of
alarm code?
Is outdoor unit fan operated
for more than 2 seconds
when the unit is restarted?
Is the connection of CN13
at outdoor unit circuit board
(PCB1) and CN201 at AC
chopper circuit board right?
Is the connection of S3, R3
at outdoor unit circuit board
(PCB1) or faston of EF9 and
S1, R1 at AC chopper circuit
board right?
Is the fuse of EF9 melted?
Is the connection of MAIN1,
COM1, SUB1 at AC chopper
circuit board right?
Is the connection of relay
connector CN1 for outdoor
fan motor right?
Faulty AC chopper.
Replace the AC chopper.
1-76
Abnormality of AC Chopper Circuit Board
(Only for 5 to 20HP & 24, 30HP 380-415/380V 50/60Hz)
Yes
No
Yes
No
No
Yes
No
Yes
Yes
No
No
Yes
No
Yes
No
Is the connection of
CT5 at outdoor circuit
board (PCB1) right?
Yes
Abnormality of AC
chopper circuit board
(PCB2).
Connect CT5 correctly.
Abnormality of CT5.
Connect correctly.
Connect correctly.
Replace fuse.
Connect correctly.
Connect correctly.