Daikin FTKS50BVMB, Service Manual

Page: 394 / 456

Troubleshooting for Outdoor Unit SiEN18-622
382 Troubleshooting
7.21 Inverter Start up Error
Remote Control
Display
L9
Applicable
Models AII outdoor unit models
Method of
Malfunction
Detection Malfunction is detected from current flowing in the power transistor.
Malfunction
Decision
Conditions When overload in the compressor is detected during startup
Supposed
Causes „ Defect of compressor
„
Pressure differential start
„ Defect of outdoor unit PCB (A1P)
Troubleshooting
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.
Inverter
o u tp u t
volt a ge check
Inverter o u tp u t volt a ge
i s not ba l a nced.
(Norm a l if within
±
5V) M us t
b e me asu red when
fre qu ency
i s s t ab le.
Un sa ti s f a ctory pre ssu re
e qua liz a tion
Check refriger a nt s y s tem.
Compre ss or in s pection
In s pect a ccording to the di a gno s i s
proced u re for odd noi s e s , vi b r a tion
a nd oper a ting s t a t us of the
compre ss or.
YE S
Repl a ce o u tdoor u nit PC b o a rd
(A1P).
NO
NO
Re s et a nd re s t a rt.
NO
The difference
b etween high a nd low
pre ssu re when s t a rting
i s ab ove
0.2MP a .
YE S
YE S
Di s connect the connection
b etween the compre ss or a nd
inverter. M a ke the power
tr a n s i s tor check mode ON b y
s ervice mode.
After t u rning
on a g a in, "L9" b link s
a g a in.
(V2 8 14)