Thermistor Or Related Abnormality (Ra Indoor Unit) - Daikin 2MXS40H2V1B Service Manual

Troubleshooting for RA Indoor Unit
5.5

Thermistor or Related Abnormality (RA Indoor Unit)

C4 , C9 , CE
Error Code
Method of Error The temperatures detected by the thermistors determine thermistor errors.
Detection
Error Decision The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation.
Conditions
Supposed
Causes
Troubleshooting
Check No.01
Refer to P.206
Check the connection of
connectors.
C4
C9
CE
167
Disconnection of connector
Defective thermistor corresponding to the error code
Defective indoor unit PCB
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
: Indoor heat exchanger thermistor
: Room temperature thermistor
: Radiant panel thermistor (FVXG series only)
NO
NO
SiBE121123_A
Correct the connection.
Replace the thermistor.
(Replace the indoor unit PCB.)
Replace the indoor unit PCB.
(R15717)
Service Diagnosis