Hitachi Utopia RPI-2.5HRG Service Manual page 50

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 alarm code is indicated on the display of the outdoor unit PCB.
# This alarm code is indicated when the any alarm code of 51, 52, 53 and 54 occurs 3 times including
3 in 30 minutes. Retry operation is performed up to the occurrence of 2 times.
Conditions: Inverter current with 150% of the rated current.
No
Restart operation.
Does it trip soon?
No It trips
immediately.
It trips after a It trips after a
certain period. certain period.
It trips It trips
occasionally. occasionally.
Is the compressor
running current as
same as rated
current? (Page 1-46)
No
Check the ISPM. *1)
Good
Are the input currents
of single phase nearly
+ _
equal? ( 3%)
No (Input currents out of balance.)
Is the supply voltage
220V/240V±10%?
Yes
Is it 170V or more
during operation?
Yes
Is it 170V more
during operation
by operation of
apparatus?
Yes
1*): Regarding the checking method for the ISPM, refer to item 1.3.3 (2).
2*): Before replacing the ISPM, refer to item 1.3.3 (1) regarding electrical discharge.
Activating Protection Against Instantaneous Overcurrent of Inverter (2)
Turn off power and
disconnect U, V, W
Yes
from compressor
terminals.
Turn ON #1 of DSW1
on ISPM and restart.
Does it trip?
Yes It trips.
Yes
Faulty
Yes (Input currents nearly equal (±3%).)
No
No
No
No
Is there any cause
of instantaneous
voltage decrease?
Yes
TROUBLESHOOTING
No
Check the
compressor.
Check the power
source capacity
and wiring.
Replace the ISPM.
*2)
Check the
compressor.
Replace the ISPM.
*2)
Replace the ISPM.
*2)
Check the power
supply.
Check the capacity
and wiring of the
power source.
Replace the ISPM.
*2)
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