Thermistor Or Related Abnormality (Indoor Unit) - Daikin J Series Service Manual

Troubleshooting
4.5

Thermistor or Related Abnormality (Indoor Unit)

C4 , C9
Remote
Controller
Display
Method of The temperatures detected by the thermistors 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.06
Refer to P.109
C4
C9
78
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.
Check the connection of
connectors.
Is it normal?
YES
Check No. 06
Check the thermistor resistance
value.
Is it normal?
YES
: Indoor heat exchanger thermistor
: Room temperature thermistor
NO
NO
SiBE041012
Correct the connection.
Replace the thermistor.
Replace the indoor unit PCB.
(R7134)
Service Diagnosis