Troubleshooting SiBE12-908
125 Service Diagnosis
2.10 Thermistor or Related Abnormality (Indoor Unit)
Remote
Controller
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
Ω
) or below about –50°C (more than 1,860 k
Ω
).
Note: The values vary slightly in some models.
Supposed
Causes
Faulty connector connection
Faulty thermistor
Faulty PCB
Troubleshooting
Check No.02
Refer to P.169
C4
: Heat exchanger thermistor
C9
: Room temperature thermistor
(R9466)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Is it normal?
Check the connector connection.
Correct the connection.
YES
Check the thermistor resistance
value.
Check No.02
NO
NO
YES
Is it normal?
Replace the thermistor.
(Replace the indoor unit PCB.)
Replace the indoor unit PCB.
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