Transmission Error (Between Indoor Unit And Remote Controller) - Daikin Super Multi Plus D-Series Service Manual

Troubleshooting for SkyAir Indoor Unit
5.12 Transmission Error (between Indoor Unit and Remote
Controller)
U5
Remote
Controller
Display
Applicable
FFQ-B, FHQ-BU
Models
Method of Microcomputer checks if transmission between indoor unit and remote controller is normal.
Malfunction
Detection
Malfunction
When transmission is not carried out normally for a certain amount of time
Decision
Conditions
Supposed
Causes
Troubleshooting
282
Failure of remote controller
Failure of indoor PCB
Outside cause (noise, etc.)
Connection of 2 master remote controllers (When using 2 remote controllers)
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Control by 2
remote controls
NO
All indoor unit
PCB microcomputer
normal monitors
blinking
YES
Using multicore
transmission wiring
between indoor unit and
remote control
NO
Is it good
condition from noise
interference?
NO
SS1 of both
YES
remote controls is
set to "main."
Resets
NO
normally when power
supply is turned off
temporarily.
YES
YES
YES
SiEBE18-526
YES
Set one of the remote
controls to"sub,"turn off
the power supply
temporarily, then restart
operation.
NO
Indoor unit PCB
replacement
Malfunction could be
produced by noise.
Check the surrounding
area and restart
operation.
Change to double-core
independent cable.
Failure of remote control
PCB or replacement of
defective indoor unit
PCB
Malfunction could be
produced by noise.
Check the surrounding
area and restart
operation.
(Q0420)
Troubleshooting