Troubleshooting SiUS04-924_A
Service Diagnosis 77
4.5 Thermistor or Related Abnormality (Indoor Unit)
Remote
Controller
Display
C4, C9
Method of
Malfunction
Detection
The temperatures detected by the thermistors determine thermistor errors.
Malfunction
Decision
Conditions
The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation.
Supposed
Causes
Disconnection of connector
Defective thermistor
Defective indoor unit PCB
Troubleshooting
Check No.01
Refer to P.110
C4 : Indoor heat exchanger thermistor
C9 : Room temperature thermistor
YES
(R14406)
NO
YES
NO
Caution
Correct the connection.
Replace the thermistor.
Replace the indoor unit PCB.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Check the connection of
connectors.
Is it normal?
Check No. 01
Check the thermistor resistance
value.
Is it normal?
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