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SiEN18-622
Troubleshooting for Outdoor Unit
Troubleshooting
373
7.12 Malfunction of Thermistor (R4T) for Outdoor Unit Heat
Exchanger
Remote Control
Display
J6
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
Malfunction is detected from the temperature detected by the heat exchanger thermistor.
Malfunction
Decision
Conditions
When a short circuit or an open circuit in the heat exchange thermistor is detected.
Supposed
Causes
Defect of thermistor (R4T) for outdoor unit heat exchanger
Defect of outdoor unit PCB (A1P)
Troubleshooting
∗
Refer to thermistor resistance / temperature characteristics table on P407.
(V
3
074)
Caution
NO
NO
Repl
a
ce the thermi
s
tor (R7T).
YE
S
YE
S
Connector
i
s
connected to 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).
Connect the thermi
s
tor
a
nd t
u
rn
on
a
g
a
in.
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.
Re
s
i
s
t
a
nce
i
s
norm
a
l when
me
asu
red
a
fter
di
s
connecting the thermi
s
tor
(R7T) from the o
u
tdoor
u
nit PC
b
o
a
rd.
(
3
.5k
ƙ
~
3
60k
ƙ
)
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 ...