Daikin VRV RXYQ72-384XAYCA Service Manual page 361

SiUS342004EB
Troubleshooting
Note(s)
1. Check the installation manual for correct wiring between indoor and outdoor units
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Is
electricity
being introduced
for the first time after
YES
installation or after an indoor
or outdoor unit PCB
has been
replaced?
NO
Is
indoor-outdoor
and outdoor-outdoor unit
transmission wiring
normal?
(∗1)
YES
Press the RETURN (BS3)
button on the outdoor unit
PCB for 5 seconds
Does an error occur?
YES
Disconnect
the
outdoor-outdoor unit
transmission wiring to
create the one-system
status, and then check
whether or not the
system is
normal.
NO
Does a
UH error occur for
all indoor units in the
system?
YES
and between outdoor and outdoor units.
Does
an error
occur even after
12 minutes elapses
from the time when electricity
is introduced to indoor
and outdoor
units?
YES
NO
NO
YES
NO
Troubleshooting by Error Code
NO
Normal
After fixing incorrect wiring,
press the RETURN (BS3)
button on the master outdoor
unit PCB for 5 seconds.
∗ The unit will not run for up to
12 minutes.
Normal
Mount the DIII-NET extension
adaptor.
Replace the indoor unit PCB.
Replace the outdoor unit main
PCB (A1P).
354