Troubleshooting by Error Code
SiAF341904E
286
Part 6 Service Diagnosis
Troubleshooting
Is
electricity
being introduced
for the first time after
installation or after an indoor
or outdoor unit main
PCB has been
replaced?
Does
an error
occur even after
12 minutes elapses
from the time when electricity
is introduced to indoor
and outdoor units?
Is
indoor-outdoor
and outdoor-outdoor
unit transmission
wiring normal?
Does a
UH
error occur for all
indoor units in the
system?
Disconnect
the
outdoor-outdoor unit
transmission wiring to
create the one-system
status, and then check
whether or not the
system is
normal.
NO
YES
YES
After fixing incorrect wiring,
press and hold the
RETURN
(BS3)
button on the master
outdoor unit main PCB for 5
seconds.
Normal
NO
YES
NO
Normal
NO
Does an error occur?
Mount the DIII-NET extension
adaptor.
YES
NO
YES
NO
YES
Replace the indoor unit PCB.
Replace the outdoor unit main
PCB (A1P).
Press and hold the
RETURN
(BS3)
button on the outdoor
unit main PCB for 5 seconds
The unit will not run for up to
12 minutes.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
