Operation Halt Due To Detection Of Thermistor Or Related Abnormality - Daikin FTK25JVE9 Service Manual

Si04-115
5.4 Operation Halt Due to Detection of Thermistor or Related
Abnormality
C4, C4, C9,
C4, C4,
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 ∗ .
Decision
∗
Conditions
When above about 212°C (less than 120 Ω ) or below about -50°C (more than 1,860 k Ω ).
Note: The values vary slightly in some models.
"
Supposed
"
Causes
"
Troubleshooting
Check No.5
Refer to P.88
C4 : Heat exchanger temperature thermistor
C9 : Suction air thermistor
CA : Discharge air thermistor
Service Diagnosis
C9, CA CA CA CA
C9, C9,
(reference)
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. 5
Thermistor resistance check
Is it normal?
YES
NO
NO
Trouble shooting
Correct the connection.
Replace the thermistor.
(Replace the indoor unit PCB.)
Replace the indoor unit PCB.
(R1947)
69