Troubleshooting
Si10-417
50
Service Diagnosis
5.2.12 Input Over Current Detection
Remote
Controller
Display
E8
Method of
Malfunction
Detection
An input over-current is detected by checking the input
current value being detected by CT with the compressor
running.
Malfunction
Decision
Conditions
The following CT input with the compressor running
continues for 2.5 seconds.
Cooling: Above 11A, Heating: Above 13A
Supposed
Causes
Over-current due to compressor failure
Over-current due to defective power transistor
Over-current due to defective outdoor unit PCB
Error detection due to outdoor unit PCB
Over-current due to short-circuit
Trouble
shooting
Check
No.7-1
Refer to
P.158
Check No.8
Refer to
P.160
Replace the outdoor
unit PCB.
∗
Inverter checker
Part No.: 1225477
Correct the power
supply or replace the
SPM.
(Replace the outdoor
unit PCB.)
Input
current flowing above
its stop level?
NO
YES
Any LED off?
YES
NO
Check with the inverter
checker (
∗
).
Turn off the power and
disconnect the harnesses U, V
and W.
Get restarted and measure
the input current.
∗
An input over-current may result from wrong internal wiring. If the
wires have been disconnected and reconnected for part
replacement, for example, and the system is interrupted by an input
over-current, take the following procedure.
A
Caution
Be sure to turn off power switch before connect or
disconnect connector, or parts damage may be occurred.
Si10-417.fm Page 50 Wednesday, September 22, 2004 6:38 PM
