77
Alarm
Code
04
Abnormal Communication between Inverter PCB and Outdoor Unit PCB
●
The alarm code is ashed 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
Cause
Check Item
Action
(Turn OFF Main Switch)
Abnormal
communication
between inverter
PCB and outdoor
unit PCB
Incorrect setting of DSW1
DIP3 of outdoor unit board
(3~6.5HP) or driver board
(7~12HP).
Re-power ON to
check if the cause is
eliminated.
Replace the outdoor unit
board (3~6.5HP) or driver
board (7~12HP) if faulty.
The outdoor unit board
(3~6.5HP) or driver board
(7~12HP) has been
damaged.
Is DSW1 DIP3
OFFϋ
Switch DIP3 of DSW1 to
OFF and re-power ON
TROUBLESHOOTING
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