Daikin FTKS50BVMB, Service Manual

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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)
Ch a nge to do ub le-core
independent c ab le.
YE S YE S
YE S
YE S
YE S
YE S
NO
NO
NO
NO
NO
Caution
Be su re to t u rn off power s witch b efore connect or di s connect connector,
or p a rt s d a m a ge m a y b e occ u rred.
Control b y 2
remote control s
All indoor u nit
PCB microcomp u ter
norm a l monitor s
b linking
U s ing m u lticore
tr a n s mi ss ion wiring
b etween indoor u nit a nd
remote control
I s it good
condition from noi s e
interference?
SS 1 of b oth
remote control s i s
s et to "m a in."
Re s et s
norm a lly when power
su pply i s t u rned off
tempor a rily.
S et one of the remote
control s to" sub ,"t u rn off
the power su pply
tempor a rily, then re s t a rt
oper a tion.
Indoor u nit PCB
repl a cement
M a lf u nction co u ld b e
prod u ced b y noi s e.
Check the su rro u nding
a re a a nd re s t a rt
oper a tion.
F a il u re of remote
control PCB or
repl
a cement of
defective indoor
u nit PCB
M a lf u nction co u ld b e
prod u ced b y noi s e. Check
the su rro u nding a re a a nd
re s t a rt oper a tion.