SiUS28-902_a
Troubleshooting by Indication on the Remote Controller
Troubleshooting
136
3.39 “
U5
” Malfunction of Transmission between Remote
Controller and Indoor Unit
Remote
Controller
Display
U5
Applicable
Models
AII indoor unit models
Method of
Malfunction
Detection
In case of controlling with 2-remote controller, check the system using microcomputer is signal
transmission between indoor unit and remote controller (main and sub) is normal.
Malfunction
Decision
Conditions
Normal transmission does not continue for specified period.
Supposed
Causes
Malfunction of indoor unit remote controller transmission
Connection of two main remote controllers (when using 2 remote controllers)
Defect of indoor unit P.C.B.
Defect of remote controller P.C.B.
Malfunction of transmission caused by noise
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.
N
O
YES
YES
N
O
Replace indoor
u
nit P.C.B.
Set one remote controller to
"SUB"; t
u
rn the po
w
er s
u
pply
off once and then
b
ack on.
There is possi
b
ility of
malf
u
nction ca
u
sed
b
y noise.
Check the s
u
rro
u
nding area
and t
u
rn on again.
N
O
N
O
Using
2-remote controllers
control.
All indoor
P.C.B. microcomp
u
ter
monitors
b
link.
YES
M
u
lti-core
ca
b
le is
u
sed for the
indoor
u
nit remote controller
transmission
w
iring.
Operation
ret
u
rns to normal
w
hen
the po
w
er is t
u
rned off
momentarily.
YES
YES
SS1 of
b
oth remote controllers
is set to "MAI
N
."
N
O
S
w
itch to do
ub
le-core
independent ca
b
le.
replacement
Defect of remote controller
P.C.B. or indoor
u
nit P.C.B.
Replace
w
hiche
v
er is
defecti
v
e.
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