Operation Halt Due To Detection Of Thermistor Or Related Abnormality - Daikin FTK25JV1NB Manual

Si-86.book Page 62 Friday, June 23, 2000 10:26 AM
Troubleshooting
Operation Halt Due to Detection of Thermistor or Related Abnormality (C4,C9,CA)
5.6
C C C C 4 4 4 4 , , , , C C C C 9 9 9 9 , , , , C C C C A A A A
Remote Controller
Display
Indoor unit LED
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
Conditions
When above about 212˚C (less than 120 ohms) or below about -50˚C (more than 1,860 kohms).
Note: The values vary slightly in some models.
Supposed Causes
Troubleshooting
Check No.5
Refer to P.79
C C C C 4 4 4 4 : Heat exchanger temperature thermistor
C C C C 9 9 9 9 : Suction air thermistor
C C C C A A A A : Discharge air thermistor
62
Faulty connector connection
Faulty thermistor
Faulty PCB
Check the connector connection.
NO
Is it normal?
YES
Check No. 5
Thermistor resistance check
NO
Is it normal?
YES
SIE-86
Correct the connection.
Replace the thermistor.
(Replace the indoor unit PCB.)
Replace the indoor unit PCB.
(MF003)
Service Diagnosis