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ESIE09-08
3.56 "U4 " Malfunction of Transmission Indoor Unit
U4
Remote Control
Display
Subcode 4
Applicable
AII indoor unit models
Models
Method of
Microcomputer checks QA communication of indoor unit.
Malfunction
Detection
Malfunction
When transmission is not carried out normally for a certain amount of time
Decision
Conditions
Supposed
Causes
Troubleshooting
Troubleshooting
Wrong wiring between indoor unit PC boards. [A4P (1
Be sure to turn off power switch before connecting or disconnecting connector,
otherwise parts may be damaged.
Caution
Is the wiring
("1-2-3" communication
and upwiring)
normal?
YES
Troubleshooting by Indication on the Remote Controller
NO
Replace indoor unit PC
board
ø
ø
) or A5P (3
)] and A1P
Correct the wiring
199
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Troubleshooting
