Daikin Super Multi Plus E-Series - Transmission Error (between Indoor Unit and Remote Control); Transmission Error (between Main and Sub Remote Control)

SiEN18-622 Troubleshooting for SkyAir Indoor Unit
Troubleshooting 347
5.12 Transmission Error (between Indoor Unit and Remote
Control)
Remote Control
Display
U5
Applicable
Models
FFQ, FCQ, FBQ, FHQ
Method of
Malfunction
Detection
Microcomputer checks if transmission between indoor unit and remote control is normal.
Malfunction
Decision
Conditions
When transmission is not carried out normally for a certain amount of time
Supposed
Causes
 Failure of remote control
 Failure of indoor PCB
 Outside cause (noise, etc.)
 Connection of 2 master remote controls (When using 2 remote controls)
Troubleshooting
(Q0420)
Change to double-core
independent cable.
YES YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Control by 2
remote controls
All indoor unit
PCB microcomputer
normal monitors
blinking
Using multicore
transmission wiring
between indoor unit and
remote control
Is it good
condition from noise
interference?
SS1 of both
remote controls is
set to "main."
Resets
normally when power
supply is turned off
temporarily.
Set one of the remote
controls to"sub,"turn off
the power supply
temporarily, then restart
operation.
Indoor unit PCB
replacement
Ma
lfunction could be
produced by noise.
Check the surrounding
areaand restart
operation.
Failure of remote
control PCB or
replacement of
defective indoor
unit PCB
Malfunction could be
produced by noise. Check
the surrounding areaand
restart operation.