Thermistor Or Related Abnormality (Ra Indoor Unit) - Daikin 3MKS50E3V1B Service Manual

Troubleshooting for RA Indoor Unit - FTXG, FTXS, CTXS, FVXG, FVXS, FLXS, FDXS Series
5.5

Thermistor or Related Abnormality (RA Indoor Unit)

C4, C9, CE
Remote
Controller
Display
Method of
The temperatures detected by the thermistors are used to determine thermistor errors.
Malfunction
Detection
Malfunction
The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation.
Decision
Conditions
Supposed
Causes
Troubleshooting
Check No.01
Refer to P.325
Check the connection of
connectors.
C4 : Indoor heat exchanger thermistor
C9 : Room temperature thermistor
CE : Radiant panel thermistor (FVXG series only)
280
Disconnection of connector
Defective thermistor
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
NO
NO
SiBE121135
Correct the connection.
Replace the thermistor.
(Replace the indoor unit PCB.)
Replace the indoor unit PCB.
(R15717)
Service Diagnosis