Hitachi mini-HNRQ1 Series Service Manual page 84

Alarm
04
Code
● The alarm code is flashed on the 7-segment display of the outdoor unit.
● The alarm code is displayed on the wired controller of the indoor unit.
★
This alarm code is displayed after the operation is stopped when an abnormal communication occurs
between the inverter PCB (Driver Board) and the outdoor unit PCB (Main Board).
Event
Abnormal
communication
between inverter
PCB and outdoor
unit PCB
Abnormal Communication between Inverter PCB and Outdoor Unit PCB
Cause
Incorrect setting of DSW1
DIP3 of outdoor unit board
(3~6.5HP) or driver board
(7~12HP).
The outdoor unit board
(3~6.5HP) or driver board
(7~12HP) has been
damaged.
Check Item
Is DSW1 DIP3
OFF
Re-power ON to
check if the cause is
eliminated.
77
TROUBLESHOOTING
Action
(Turn OFF Main Switch)
Switch DIP3 of DSW1 to
OFF and re-power ON
Replace the outdoor unit
board (3~6.5HP) or driver
board (7~12HP) if faulty.