Thermistor Or Related Abnormality - Daikin FTXM-V Series Service Manual

SiUS042113E
4.5

Thermistor or Related Abnormality

C4, C9
Error Code
Method of Error The temperatures detected by the thermistors determine thermistor errors.
Detection
Error Decision
The communication error of thermistor(s) or malfunction of thermistor(s).
Conditions
Supposed
 Disconnection of connector
Causes  Defective thermistor(s)
 Defective indoor unit PCB
Troubleshooting
C4 : Indoor heat exchanger thermistor
C9 : Room temperature thermistor
Reference
Check No.01 Refer to P.134
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check the connection of
connectors.
Normal?
YES
Check No. 01
Check the thermistor resistance
value.
Normal?
YES
NO
NO
Troubleshooting
Correct the connection.
Replace the defective
thermistor(s).
Replace the indoor unit PCB
(control PCB).
(R21870)
95