Thermistor Or Related Abnormality (Indoor Unit) - Daikin FTXS20K2V1B Service Manual

SiBE041134EB
4.5

Thermistor or Related Abnormality (Indoor Unit)

C4 , C9
Error Code
Method of Error The temperatures detected by the thermistors determine thermistor errors.
Detection
Error Decision The voltage between the both ends of the thermistor is 4.96 V and more or 0.04 V and less
during compressor operation.
Conditions
Supposed
Causes
Troubleshooting
Check No.01
Refer to P.94
Check the connection of
connectors.
C4
C9
Service Diagnosis
Disconnection of connector
Thermistor corresponding to the error code is defective.
Defective indoor unit PCB
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
: Indoor heat exchanger thermistor
: Room temperature thermistor
NO
NO
Troubleshooting
Correct the connection.
Replace the defective
thermistor.
Replace the indoor unit PCB
(control PCB).
(R21870)
65