Service Manual

SiUS121827E Troubleshooting for SA Indoor Unit
Part 6 Service Diagnosis 193
Note
6.11 Signal Transmission Error (Between MAIN/SUB Remote
Controllers)
Error Code U8
Method of Error
Detection
In case of controlling 1 indoor unit with 2 remote controllers, check the system using microcomputer
if signal transmission between MAIN remote controller and SUB remote controller 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
For the way to change MAIN/SUB setting of remote controllers, refer to pages 267 and 268.
Turn the power off and then
back on. If a malfunction occurs,
replace the remote controller.
Turn the power off and then
back on. If a malfunction occurs,
replace the remote controller.
Set one remote controller to
MAIN; turn the power supply off
once and then back on.
Set the remote controller to
MAIN; turn the power supply off
and then back on.
YES
NO
YES
NO NO
YES
(R24058)
Using 2 remote
controllers for 1
indoor unit?
Are 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.
Is the
remote controller set to
MAIN?