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SiEN18-622
Troubleshooting for Outdoor Unit
Troubleshooting
383
7.22 Malfunction of Transmission between Inverter and
Control PCB
Remote Control
Display
LC
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
Check the communication state between inverter PCB and control PCB by micro-computer.
Malfunction
Decision
Conditions
When the correct communication is not conducted in certain period.
Supposed
Causes
Malfunction of connection between the inverter microcomputer and outdoor control
microcomputer
Defect of outdoor unit PCB
Defect of noise filter
External factor (Noise etc.)
Troubleshooting
Caution
NO
YE
S
NO
YE
S
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.
The
microcomp
u
ter
monitor (green) on the
o
u
tdoor
u
nit PC
b
o
a
rd
(A1P) i
s
b
linking.
The volt
a
ge
b
etween red
a
nd white
of X1A on the inverter
u
nit i
s
the power
su
pply
volt
a
ge.
Repl
a
ce o
u
tdoor
u
nit PC
b
o
a
rd (A1P).
Repl
a
ce o
u
tdoor
u
nit PC
b
o
a
rd (A1P).
When the LC m
a
lf
u
nction
occ
u
r
a
g
a
in, repl
a
ce control
PC
b
o
a
rd.
Check the noi
s
e filter (A
3
P)
for di
s
connection,
a
nd
check the power
su
pply
wiring.
Summary of Contents for FTKS50BVMB
Page 1: ...SiEN18 622 E Series Service Manual Applied Models zSuper Multi Plus Cooling Only Heat Pump ...
Page 105: ...Refrigerant Flow for Each Operation Mode SiEN18 622 92 Refrigerant Circuit ...
Page 157: ...Indoor Unit SkyAir Models SiEN18 622 144 Function ...
Page 312: ...SiEN18 622 Ceiling Mounted Cassette Type System Configuration 300 ...
Page 424: ...Method of Replacing The Inverter s Power Transistors Modules SiEN18 622 412 Troubleshooting ...
Page 446: ...Wiring Diagrams SiEN18 622 434 Appendix ...
Page 452: ...SiEN18 622 vi Index ...