Daikin REYQ72 Serveice Manual page 197

Troubleshooting by Indication on the Remote Controller
Troubleshooting
186
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
"U9"
NO
has been displayed for 2
minutes or more.
YES
Turn on all indoor units.
NO
The "UA"
display blinks on the
YES
remote controllers of other
units within the same
refrigerant
system.
NO
The "A1"
display blinks on
YES
the remote controllers of
otherunits within the same
refrigerant
system.
NO
The "A9"
display blinks on
the remote controllers of YES
otherunits within the same
refrigerant
system.
NO
The "U4"
display blinks on
YES
the remote controllers of
otherunits within the same
refrigerant
system.
NO
SiUS39-602
Re-diagnose by display after
passage of 2 minutes or more.
Refer to failure diagnosis for "UA"
malfunction code.
Refer to failure diagnosis for "A1"
malfunction code.
Refer to failure diagnosis for "A9"
malfunction code.
Refer to failure diagnosis for "U4"
malfunction code.
Refer to failure diagnosis for "U5"
malfunction code.
(V2826)
Troubleshooting