Daikin VRV II-Q RQYQ8-48PY1B Service Manual page 168

Troubleshooting by Remote Controller
Troubleshooting
158
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Continued from the previous page
In Confirmation of error 4,
LED lamp indicates as follows:
Start operation of all the indoor
units.
Do all the units
U9
indicate " "?
YES
Did more than 2
U9
minutes pass since " "
was indicated?
YES
NO
NO
SiBE341027
Continue the operation.
Make a diagnosis again based on
the indication in 2 minutes and
over.
The indoor units PCB indicating
U9
" " are normal.
Check the indoor units in the other
circuits to diagnose failure
according to the corresponding
error codes.
Service Diagnosis