SiBE18-821_C Troubleshooting for Outdoor Unit
Troubleshooting 413
7.27 Transmission Error between Remote Controller and
Indoor Unit
Remote
Controller
Display
U5
Method of
Malfunction
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.
Malfunction
Decision
Conditions
Normal transmission does not continue for specified period.
Supposed
Causes
îš„
Malfunction of indoor unit remote controller transmission
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
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Does
operation
returns to normal when
the power is turned off
momentarily?
NO
NO
NO
YES
NO
Replace the indoor unit
PCB.
Set one remote controller to
"SUB"; turn the power supply
off once and then back on.
There is possibility of
malfunction caused by noise.
Check the surrounding area
and turn on again.
There is possibility of
malfunction caused by noise.
Check the surrounding area
and turn on again.
Normal
Normal
NO
NO
YES
YES
YES
Replace the remote controller.
Return to normal?
Return to normal?
YES
Replace the indoor unit PCB.
YES
Using
2 remote controllers?
Do all indoor
PCB microcomputer
monitors blink?
Is SS1 of
both remote controllers
set to "MAIN"?
(R13047)
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