SiBE121123_A Troubleshooting for SA Indoor Unit
Service Diagnosis 176
6.8 Signal Transmission Error (between MAIN Remote
Controller and SUB Remote Controller)
Error Code
U8
Method of Error
Detection
In case of controlling with 2 remote controllers, check the system using microcomputer if 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
Remote controller is set to “SUB” when using 1 remote controller
Connection of 2 sub remote controllers (when using 2 remote controllers)
Defective remote controller PCB
Troubleshooting
Is SS1
of remote
controller PCB set to
"SUB"?
Turn the power off and then
back on. If a malfunction occurs,
replace the remote controller
PCB.
Set one remote controller to
"MAIN"; turn the power supply
off once and then back on.
Set SS1 to "MAIN"; turn the
power supply off once and then
back on.
YES
NO
YES
NO NO
YES
(R15321)
Using 2 remote
controllers?
Is SS1 of both
remote controllers
set to "SUB"?
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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