Hitachi FSG Series Service Manual page 54

1
TROUBLESHOOTING
46
Alarm Code
32
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 on the remote control switch of other indoor unit when no transmitting data is
issued from a malfunctioning indoor unit for more than 60 minutes after receiving transmitting data from the
indoor unit.
Is there any indoor unit with
indication of alarm code "03"?
No
Is there any indoor unit
whose lamp is not lit or whose
LCD is not indicated at the
remote control switch?
Yes
Check the power source, fuse
and transformer of the indoor
unit.
Phenomenon
Abnormal
Transmitting
from Other
Units
*1): This abnormality is indicated on an indoor unit which is normal, since this is due to abnormality of transmitting of the in door units or
power source abnormality in the same refrigeration cycle and electrical system. If the power source is abnormal, abnormality can
not be indicated by its indoor unit, so, this alarm is indicated on the remote control switch of other normal indoor unit.
Abnormality in Transmitting of Other Indoor Units
Yes
Is the connector CN2 on PCB
of indoor unit loose?
Is LED3 (yellow)
flickering on the PCB of indoor
Is LED3 OFF?
Is still LED3 ON?
Faulty indoor unit PCB.
Cause
Abnormal Transmitting
Indoor Unit“Outdoor Unit
Outdoor Unit“Indoor Unit
Incorrect Power Supply (to
Indoor Unit) *1)
Faulty Indoor Unit PCB
Yes
No
Yes
unit?
No
Yes
No
Yes
Check Item
Check indoor unit showing
alarm code "03"..
Check indoor unit showing
no light ON on remote
control switch.
If all indoor unit show
alarm code 32, check PCB
by self-checking mode for
Plug the connector CN2 properly
and restart operation.
Check the wires between the
indoor unit and outdoor unit.
Check connections of the PCB
of indoor unit or connector CN1.
Action
(Turn OFF main switch)
Take action according to
pages 1-23 to 26.
Take action according to
page 1-9 to 10.
Replace PCB if faulty.