ESIE09-08A Troubleshooting by Indication on the Remote Controller
Troubleshooting 213
3.58 “U5 ” Malfunction of Transmission between Remote Control
and Indoor Unit
Remote Control
Display
U5
U5 Subcode 0
Applicable Models AII indoor unit models
Method of
Malfunction
Detection
In case of controlling with 2-remote control, check the system using microcomputer is signal
transmission between indoor unit and remote (correct if faulty) control (main and sub) is normal.
Malfunction
Decision Conditions
Normal transmission does not continue for specified period.
Supposed Causes Malfunction of indoor unit remote control transmission
Connection of two main remote controls (when using 2 remote controls)
Defect of indoor unit PC board (A1P)
Defect of remote control PC board
Malfunction of transmission caused by noise
Troubleshooting
: Refer to information on P221.
Caution
Be sure to turn off power switch before connecting or disconnecting connector,
otherwise parts may be damaged.
(V2823)
NO
YES
YES
NO
Replace indoor unit PC
board (A1P).
Set one remote control 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.
NO
NO
Using 2-remote
controls control.
All
indoor PC board
microcomputer monitors
blink.
YES
Multi-core
cables used for the
indoor unit remote control
transmission wiring.
Operation
returns to normal
when the power is turned
off momentarily.
YES
YES
SS1 of both
remote controls is set to
"MAIN."
NO
Switch to double-core
independent cable.
replacement
Defect of remote control PC
board or indoor unit PC board (A1P).
Replace which ever is
defective.
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