SiUS281811EA Troubleshooting by Error Codes
Part 6 Service Diagnosis 283
4.52 Transmission Error between Main and Sub Remote
Controllers
Error Code U8
Applicable
Models
All indoor units
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
Transmission error between main and sub remote controller
Connection between sub remote controllers
Defective remote controller PCB
Troubleshooting
Refer to page 90 for Main/Sub setting.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Main/Sub
setting of both remote
controllers is set to Sub.
Main/Sub setting of the
remote controller is set to
Main.
Set Main/Sub setting to
Main; turn power supply
OFF once and then restart.
Set Main/Sub setting of one
of the remote controllers to
Main; turn power supply
OFF once and then restart.
Turn the power OFF and
then restart. If an error
occurs, replace the remote
controller PCB.
YES
YES
YES
NO
NO
NO
Using 2 remote
controllers.
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