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SiEN12-710A
Troubleshooting
Service Diagnosis
115
4.5 Thermistor or Related Abnormality (Indoor Unit)
Remote Control
Display
C4, C9
Method of
Malfunction
Detection
The temperatures detected by the thermistors are used to determine thermistor errors.
Malfunction
Decision
Conditions
When the thermistor input is more than 4.96 V or less than 0.04 V during compressor
operation
∗
.
∗
(reference)
When above about 212°C (less than 120 ohms) or below about –50°C (more than 1,860 kohms).
Note:
The values vary slightly in some models.
Supposed
Causes
"
Faulty connector connection
"
Faulty thermistor
"
Faulty PCB
Troubleshooting
Check No.06
Refer to P.149
C4
: Heat exchanger temperature thermistor
C9
: Room temperature thermistor
YE
S
(R71
3
4)
NO
YE
S
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.
Check No. 06
Check the thermi
s
tor re
s
i
s
t
a
nce
v
a
l
u
e.
I
s
it norm
a
l?
I
s
it norm
a
l?
Check the connector connection.
Correct the connection.
Repl
a
ce the thermi
s
tor.
(Repl
a
ce the indoor
u
nit PCB.)
Repl
a
ce the indoor
u
nit PCB.
Summary of Contents for 2MKS40FV1B
Page 11: ...Introduction SiEN12 710A x ...
Page 12: ...SiEN12 710A List of Functions 1 Part 1 List of Functions 1 Cooling Only 2 2 Heat Pump 4 ...
Page 17: ...Heat Pump SiEN12 710A 6 List of Functions ...
Page 25: ...Heat Pump SiEN12 710A 14 Specifications ...
Page 111: ...Instruction SiEN12 710A 100 Operation Manual ...
Page 199: ...Wiring Diagrams SiEN12 710A 188 Appendix ...
Page 203: ...SiEN12 710A iv Index ...