Troubleshooting for SA Indoor Unit SiBE121135_A
195 Service Diagnosis
6.6 Thermistor or Related Abnormality (SA Indoor Unit)
Error Code C4, C5, C9
Method of Error
Detection
The temperatures detected by the thermistors determine thermistor errors.
Error Decision
Conditions
The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation.
Supposed
Causes
îš„ Disconnection of connector
îš„ Defective thermistor corresponding to the error code
îš„ Defective indoor unit PCB
Troubleshooting If the cause of the problem is related to the thermistors, the thermistors should be checked prior
to changing the indoor unit PCB.
To check the thermistors, proceed as follows:
C4 : Indoor heat exchanger thermistor 1 (liquid pipe) (R2T)
C5 : Indoor heat exchanger thermistor 2 (R3T)
C9 : Room temperature thermistor (R1T)
Check No.01
Refer to P.230
Step Action
1 Disconnect the thermistor from the indoor unit PCB.
2 Read the temperature and the resistance value.
3
Check if the measured values correspond with the values in the table of thermistor
resistance check.
YES
(R14406)
NO
Check No. 01
Check the thermistor resistance
value.
YES
NO
Caution
Correct the connection.
Replace the thermistor.
(Replace the indoor unit PCB.)
Replace the indoor unit PCB.
Is it normal?
Is it normal?
Check the connection of
connectors.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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