Daikin RXG20L2V1B - Thermistor or Related Abnormality (Indoor Unit)

Troubleshooting SiBE041401E
63 Service Diagnosis
4.5 Thermistor or Related Abnormality (Indoor Unit)
Error Code
C4
,
C9
Method of Error
Detection
The temperatures detected by the thermistors determine thermistor errors.
Error Decision
Conditions
The thermistor input is 4.96 V and more or 0.04 V and less during compressor operation.
Supposed
Causes

Disconnection of connector

Thermistor corresponding to the error code is defective.

Defective indoor unit PCB
Troubleshooting
Check No.01
Refer to P.93
C4
: Indoor heat exchanger thermistor
C9
: Room temperature thermistor
YES
(R15717)
NO
Check No. 01
Check the thermistor resistance
value.
YES
NO
Caution
Correct the connection.
Replace the thermistor.
Replace the indoor unit PCB.
Normal?
Normal?
Check the connection of
connectors.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.