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

Troubleshooting
4.6

Thermistor or Related Abnormality (Indoor Unit)

C9
Error Code
Description
Indoor Heat Exchange Thermistor Short/Open.
Method of Error
The temperature detected by the thermistors determine thermistor errors.
Detection
Error Decision The resistance of the thermistor is out of range (0 Ω or ∞ Ω)
Conditions
Supposed
 Disconnection of connector
Causes  Defective thermistor(s)
 Defective indoor unit PCB
Troubleshooting
Check the connection of
connectors.
C9 : Room temperature thermistor
Reference
Check No.01 Refer to P.65
Note
When replacing the defective thermistor(s), replace the thermistor as ASSY.
63
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
Normal ?
YES
Check No. 01
Check the thermistor resistance
value.
Normal ?
YES
NO
NO
DAMA-SM-21-001
Correct the connection.
Replace the defective
thermistor.
Replace the indoor unit PCB
(control PCB).
Service Diagnosis