Daikin VRVII Manual page 315

Check of error 3
310
Troubleshooting by Indication on the Remote Controller
Diagnosis Flow 8
Check of error 4
Check
the
connection
status of the
connecting wires
of outdoor multi.
Check if the wiring has
any connection error or
broken, or is about to
be disconnected.
YES
NO
Replace the
outdoor unit main
PCB.
Correct the
connecting wires
of the outdoor
multi and then
reset the power
supply.