SiBE18-821_C Troubleshooting for SA Indoor Unit
Troubleshooting 373
5.10 Transmission Error between Remote Controller and
Indoor Unit
Remote
Controller
Display
U5
Method of
Malfunction
Detection
Microcomputer checks if transmission between indoor unit and remote controller is normal.
Malfunction
Decision
Conditions
When transmission is not carried out normally for a certain amount of time
Supposed
Causes
îš„
Connection of 2 main remote controllers (when using 2 remote controllers)
îš„
Defective indoor unit PCB
îš„
Defective remote controller PCB
îš„
Transmission error caused by noise
Troubleshooting
Normal
Normal
There is possibility of
malfunction caused by noise.
Check the surrounding area and
turn on again.
Set one remote controller to
"SUB"; turn the power supply off
once and then back on.
Replace the indoor unit PCB.
There is possibility of
malfunction caused by noise.
Check the surrounding area and
turn on again.
NO
YES
YES
Return to normal?
Return to normal?
NO
YES
YES YES
NO NO
NO
NO
YES
(R13008)
Replace the remote controller.
Replace the indoor unit PCB.
Using 2 remote
controllers?
Is SS1 of
both remote controllers
set to "MAIN"?
All indoor PCB
microcomputer monitors
blink?
Operation
returns to normal when
the power is turned off
momentarily.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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