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

Troubleshooting
4.6

Thermistor or Related Abnormality (Indoor Unit)

C9
Error Code
Description
Room temperature thermistor short/open.
Method of Error The temperature detected by the thermistors determine thermistor errors.
Detection
The resistance of the thermistor is out of range (0 Ω or ∞ Ω)
Error Decision
Conditions
 Disconnection of connector
Supposed
 Defective thermistor(s)
Causes
 Defective indoor unit PCB
Troubleshooting
C9 : Room temperature thermistor
Reference
Check No.01 Refer to P.85
Note
When replacing the defective thermistor(s), replace the thermistor as ASSY.
60
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
Check the connection of
connectors.
Normal ?
YES
Check No. 01
Check the thermistor resistance
value.
Normal ?
YES
NO
NO
DAMA-SM-21-003
Correct the connection.
Replace the defective
thermistor.
Replace the indoor unit PCB
(control PCB).
Service Diagnosis