Daikin Super Multi Plus D-Series, Service Manual

Page: 293 / 395

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