Service manual

SiE18-201 Troubleshooting - Outdoor Unit Related
Service Diagnosis 215
3.3.4 Operation Halt Due to Detection of INV Input Current Error
Outdoor Unit
Indication
E8
Method of
Malfunction
Detection
INV input current error is detected using INV input current detected by CT.
Malfunction
Decision
Conditions
When the inverter input current of 28A or more continued for 2.5 seconds.
 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.)
Supposed
Causes
 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
Troubleshooting
Check No.5
Refer to P.251
Check No.6
Refer to P.252
Check No.7
Refer to P.253
Check No.1
Refer to P.249
Check No.2
Refer to P.249
YES
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)
Check No. 1
Installation conditions check
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Does the
INV input current
(integrated input indoor
current) as shown
left flow?
NO
Check No. 5
Wiring connection check to
run.
Make sure of integrated input
current (Substitution of INV
input that can not be measured)
Check No. 6
Power transistor check
Check No. 7
Power transistor output check
OK
Check No. 2
Discharge pressure check
(Note* Indoor current=0-4.5A)