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Troubleshooting by Remote Controller
Si20-701_B
429
YES
YES
YES
Is it a
multi outdoor unit
connection
system?
Is the
combination of
master unit and slave
unit correct?
NO
Replace the
outdoor unit main
PCB.
NO
NO
Change to a
correct
combination.
Replace the
outdoor unit main
PCB.
Correct the
combination of
indoor units with
"
UA
" displayed.
Replace the
indoor unit PCB.
A
B
Is
the type
of refrigerant
for the indoor units
with "
UA
" displayed
corresponding to that
for the outdoor
units?
YES
Does
the refrigerant
type of indoor and
outdoor unit
match?
NO
Matches the
refrigerant type
of indoor and
outdoor unit.