Daikin FTX25JVEA9 Service Manual page 279

Troubleshooting - Outdoor Unit Related
3.3.4 Operation Halt Due to Detection of INV Input Current Error
E8
Outdoor Unit
Indication
Method of INV input current error is detected using INV input current detected by CT.
Malfunction
Detection
Malfunction When the inverter input current of 28A or more continued for 2.5 seconds.
Decision
"
Conditions
"
Supposed
"
Causes
"
"
"
Troubleshooting
Check No.5
Refer to P.302
Check No.6
Refer to P.303
Check No.7
Refer to P.304
Check No.1
Refer to P.300
Check No.2
Refer to P.300
266
When an INV input current error is generated 4 times, the system shuts down.
(The 4-time counter resets itself when no outdoor unit abnormality occurs within 60-minute
cumulative time after the error generation.)
Faulty wiring connection of filter PC board and control PC board
Faulty compressor
Overcurrent due to faulty PC board
Incorrect detection due to faulty PC board
Short-circuit
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Check No. 5
Wiring connection check to
run.
Make sure of integrated input
current (Substitution of INV
input that can not be measured)
Does the
INV input current
(integrated input indoor
current) as shown
left flow?
YES
Check No. 6
Power transistor check
Check No. 7
Power transistor output check
Check No. 1
Installation conditions check
OK
Check No. 2
Discharge pressure check
NO
(Note* Indoor current=0-4.5A)
Si18-201
Apply required remedy
subject to the case.
Replace control PC board /
filter PC board.
Apply required remedy
subject to the case.
Apply required remedy
subject to the case.
Apply required remedy
subject to the case.
(MF023)
Service Diagnosis