Troubleshooting by Indication on the Unified ON/OFF Controller
SiUS28-902_a
151
Troubleshooting
Troubleshooting
Caution
Be s
u
re to t
u
rn off the po
w
er s
w
itch
b
efore connecting or disconnecting
the connector, or parts co
u
ld
b
e damaged.
Is the
po
w
er s
u
pply for
the indoor
u
nit displaying
a malf
u
nction
t
u
rned
on?
Is
transmission
w
iring
disconnected or
w
ired
incorrectly?
Is the
transmission
w
iring
w
ith the master
controller disconnected or
w
ired incorrectly?
Is the
master
controller
'
s connector for
setting master controller
disconnected.
Set the gro
u
p
N
o.
correctly.
Replace the indoor
u
nit P.C.B.
Fix the
w
iring correctly.
Fix the
w
iring correctly.
Connect the connector
correctly.
Replace the central P.C.B.
Reset po
w
er s
u
pply for all
optional controllers for
centralized control
sim
u
ltaneo
u
sly.
N
O
YES
N
O
YES
YES
N
O
YES
T
u
rn the po
w
er s
u
pply of the
indoor
u
nit on.
YES
N
O
N
O
YES
N
O
YES
N
O
Has a
once connected
indoor
u
nit
b
een remo
v
ed
or its address
changed?
Diagnose the ca
u
se
w
ith the
air conditioner
'
s fail
u
re
diagnosis man
u
al.
N
O
YES
Is a
malf
u
nction
code displayed on the
remote controller?
Is
the gro
u
p
N
o. of malf
u
nctioning
indoor
u
nits
set?
Is
transmission
w
ith all indoor
u
nits
malf
u
nctioning?
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