Specifications

Troubleshooting for Outdoor Unit SiBE18-821
336 Troubleshooting
7.30 Malfunction of Transmission between Remote Controller
and Indoor Unit
Remote
Controller
Display
U5
Applicable
Models
AII indoor unit models
Method of
Malfunction
Detection
In case of controlling with 2-remote controller, check the system using microcomputer is 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

Malfunction of indoor unit remote controller transmission

Connection of two main remote controllers (when using 2 remote controllers)

Defect of indoor unit PCB

Defect of remote controller PCB

Malfunction of transmission caused by noise
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Using 2-remote
controllers control.
SS1 of both
remote controllers is set to
"MAIN."
All indoor PC
board microcomputer
monitors blink.
Operation
returns to normal when
the power is turned off
momentarily.
Multi-core
cableis used for the
indoor unit remote controller
transmission
wiring.
Set one remote controller
to "SUB"; turn the power
supply off once and then
back on.
Defect of remote controller
PC board or indoor unit
PC board. Replace
whichever is defective.
(Q0579)
YES
NO
YES
Replace indoor unit PC
board.
NO
Switch to double-core
independent cable.
replacement
YES
NO
YES
NO
There is possibility of
malfunction caused by
noise. Check the
surrounding area and turn
on again.
YES
NO