Troubleshooting by Indication on the Remote Controller
SiUS28-902_B
142
Service Diagnosis
3.41 Transmission Error (between Remote Controller and
Indoor Unit)
Remote
Controller
Display
U5
Applicable
Models
All indoor unit models
Method of Error
Detection
In case of controlling with 2-remote controller, check the system using micro-computer is signal
transmission between indoor unit and remote controller (main and sub) is normal.
Error Decision
Conditions
Normal transmission does not continue for specified period.
Supposed
Causes
Connection of 2 main remote controllers (when using 2 remote controllers)
Defective indoor unit PCB
Defective remote controller PCB
External factor (Noise, etc.)
Troubleshooting
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 may
b
e damaged.
Caution
YES
Replace the indoor
u
nit
PCB.
Set one remote controller to
"SUB"; t
u
rn the po
w
er s
u
pply
OFF once and then
b
ack O
N
.
There is possi
b
ility of error
ca
u
sed
b
y noise. Check the
s
u
rro
u
nding area and t
u
rn O
N
again.
There is possi
b
ility of error
ca
u
sed
b
y noise. Check the
s
u
rro
u
nding area and t
u
rn O
N
again.
N
ormal
N
ormal
N
O
Replace the remote controller
N
ormal
Replace the indoor
u
nit PCB.
N
ormal
Using 2-remote
controllers control.
All indoor
u
nit PCB micro-comp
u
ter
monitors
b
link.
SS1 of
b
oth remote
controllers is set to
"MAI
N
."
Operation
ret
u
rns to normal
w
hen
the po
w
er is t
u
rned OFF
momentarily.
YES
N
O
YES
N
O
N
O
YES
YES
N
O
YES
N
O
