Thermistor Or Related Abnormality (Indoor Unit) - Daikin FTX20K(2)V1B Service Manual

SiBE041525F
4.5

Thermistor or Related Abnormality (Indoor Unit)

C4, C9
Error Code
The temperatures detected by the thermistors determine thermistor errors.
Method of Error
Detection
The voltage between the both ends of the thermistor is 4.96 V and more or 0.04 V and less
Error Decision
during compressor operation.
Conditions
 Disconnection of connector
Supposed
 Thermistor corresponding to the error code is defective.
Causes
 Defective indoor unit PCB
Troubleshooting
Check No.01
Refer to P.79
Check the connection of
connectors.
C4 : Indoor heat exchanger thermistor
C9 : Room temperature thermistor
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Normal?
YES
Check No. 01
Check the thermistor resistance
value.
Normal?
YES
NO
NO
Troubleshooting
Correct the connection.
Replace the defective
thermistor.
Replace the indoor unit PCB
(control PCB).
(R21870)
54