Hitachi FSG Series Service Manual page 67

Alarm Code
59
n "RUN" light flickers and "ALARM" is indicated on the remote control switch.
n 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 € less than 0.5A when outdoor
unit fan is operating, or ó more than 2A while outdoor unit fan stops.
Is outdoor unit fan operating
during the indication
of alarm code.
No
Is outdoor unit fan operated for
more than 2 seconds when the
unit is restarted?
No
Is the connection of CN13 at
outdoor unit circuit board (PCB1)
and CN201 at AC chopper circuit
board right?
Yes
Is the connection of S3, R3 at
outdoor unit circuit board (PCB1) or
faston of EF5 and S1, R1 at AC
chopper circuit board right?
Yes
Is the fuse of EF 5 melted?
No
Is the connection of MAIN1,
COM1, SUB1 at AC chopper
circuit board right?
Yes
Is the connection of relay
connector CN1 for outdoor fan
motor right?
Yes
Faulty AC chopper. Replace the
AC chopper.
Abnormality of AC Chopper Circuit Board
Yes
Yes
Is the connection of CT5 at
outdoor circuit board (PCB1)
right?
No
No
Yes
No
No
TROUBLESHOOTING
Abnormality of AC chopper
No
Yes
1
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circuit board (PCB2).
Connect CT5 correctly.
Abnormality of CT5.
Connect correctly.
Connect correctly.
Replace fuse.
Connect correctly.
Connect correctly.