Troubleshooting Si04-402A
88 Service Diagnosis
4.14 Input Over Current Detection
Remote
Controller
Display
E8
Method of
Malfunction
Detection
An input over-current is detected by checking the input current value with the compressor
running.
Malfunction
Decision
Conditions
The following current with the compressor running continues for 2.5 seconds.
Cooling
˚ Heating: Above 12A
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
Troubleshooting
Check No.7
Refer to P.107
Check No.8
Refer to P.108
Note: If the model doesn’t have SPM, replace the outdoor unit PCB.
Replace the outdoor unit
PCB.
∗ Inverter checker
Part No.: 1225477
Correct the power supply or
replace the SPM.
(Replace the outdoor unit
PCB.)
(R2952)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Input current flowing
above its stop level?
NO
YES
Any LED off?
YES
NO
Check with the inverter checker (∗).
Turn off the power, and reconnect
the harnesses. Turn on the power
again and get restarted.
Turn off the power and disconnect
the harnesses U, V and W.
Get restarted and measure the
input current.
Check No. 8
Check the discharge pressure.
Check No. 7
Check the installation condition.
∗ 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.
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