Hitachi Utopia RPI-2.5HRG Service Manual page 25

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,
or the alarm code is indicated on the display of the outdoor unit PCB.
G This alarm is indicated when abnormality is maintained for 3 minutes after normal transmitting
between indoor units and outdoor unit, and also abnormality is maintained for 30 seconds after the
micro-computer is automatically reset.
The alarm is indicated when the abnormal transmitting is maintained for 30 seconds from starting of
the outdoor unit.
# Investigate the cause of overcurrent and take necessary action when fuses are melted or the
breaker for the outdoor unit are activated.
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Abnormal Transmitting between Indoor Units and Outdoor Unit