Thermistor Or Related Abnormality (Indoor Unit) - Daikin SUPER MULTI NX G Series Service Manual

Troubleshooting
5.6

Thermistor or Related Abnormality (Indoor Unit)

C4, C9
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
 Disconnection of connector
Supposed
 Defective thermistor
Causes
 Defective indoor unit PCB
Troubleshooting
Check No.06
Refer to P.152
C4 : Indoor heat exchanger thermistor
C9 : Room temperature thermistor
109
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check the connection of
connectors.
Is it normal?
YES
Check No. 06
Check the thermistor resistance
value.
Is it normal?
YES
NO
NO
SiUS12-928_A
Correct the connection.
Replace the thermistor.
(Replace the indoor unit PCB.)
Replace the indoor unit PCB.
(R7134)
Service Diagnosis