Thermistor Or Related Abnormality (Indoor Unit) - Daikin CTXS09GVJU Service Manual

SiUS12-814
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
When the thermistor input is more than 4.96 V or less than 0.04 V during compressor operation∗.
∗ (reference)
Decision
When above about 414°F (less than 120 ohms) or below about –58°F (more than 1,860 kohms).
Conditions
Note: The values vary slightly in some models.
Supposed
Causes
Troubleshooting
Check No.06
Refer to P.161
C4 : Heat exchanger temperature thermistor
C9 : Room temperature thermistor
Service Diagnosis
Faulty connector connection
Faulty thermistor
Faulty PCB
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Check the connector connection.
Is it normal?
YES
Check No. 06
Check the thermistor resistance
value.
Is it normal?
YES
NO
NO
Troubleshooting
Correct the connection.
Replace the thermistor.
(Replace the indoor unit PCB.)
Replace the indoor unit PCB.
(R7134)
121