Thermistor Or Related Abnormality (Indoor Unit) - Daikin FTKM-U Series Service Manual

SiMX042215E
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 either 4.96 V or more, or 0.04 V or less
Conditions with the power on.
Supposed
 Disconnection of connector
Causes  Defective thermistor(s)
 Defective indoor unit PCB
Troubleshooting
Check the connection of
connectors.
C4: Indoor heat exchanger thermistor
C9: Room temperature thermistor
Reference
Check No.01 Refer to P.90
Part 6 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)
61