Daikin VRVII Manual page 310

Troubleshooting by Indication on the Remote Controller
Troubleshooting
Caution
Check of error 3
Cool/Heat
selection is unified.
YES
Setting of
C/H SELECT of
the external control
adaptor for outdoor
unit is "unified
MASTER".
NO
Setting of
C/H SELECT of
the external control
adaptor for outdoor
unit is "SLAVE".
YES
Check if
the normal
condition monitor LED
for the outdoor unit
main PCB
blinks.
YES
A
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
Diagnosis Flow 2
Check of error 4
NO
YES
NO
NO
Check
if power is
supplied to the
outdoor unit.
NO
YES
C/H SELECT of
the external
control adaptor
for outdoor unit is
set to "IND".
The unified
addresses for
COOL/HEAT
within the
outdoor/outdoor
transmission are
duplicated. Set
the address
again.
Replace the
outdoor unit main
PCB.
Supply the power
to the outdoor
unit.
Replace the
outdoor unit main
PCB.
305