Troubleshooting for Outdoor Unit SiUS12-928_B
169 Service Diagnosis
6.10 Input Overcurrent Detection
Remote
Controller
Display
E8
Outdoor Unit LED
Display
A 5 1 3 2 4 3 3 4 4
Method of
Malfunction
Detection
Detected by checking the input current value
Malfunction
Decision
Conditions
The input current is at a certain value (depending on the condition) for 2.5 seconds.
The compressor halts if the error occurs, and restarts automatically after 3-minute standby.
Supposed
Causes
Outdoor temperature is out of operation range.
Defective compressor
Defective power module
Defective outdoor unit PCB
Short circuit
Troubleshooting
Check No.15
Refer to P.196
Check No.17
Refer to P.198
Check No.18
Refer to P.198
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
(R15325)
NO
YES
YES
NO
Check No. 17
Check the installation condition.
Start operation and measure the
input current.
Turn off the power and disconnect
the harnesses U, V, and W.
Check No. 15
Check with the inverter checker (∗).
Turn off the power, and reconnect
the harnesses. Turn on the power
again and start operation.
Check No. 18
Check the discharge pressure.
Replace the outdoor unit
PCB.
Correct the power supply or
replace the outdoor unit
PCB.
∗ Inverter checker
Part No.: 1225477
Input current flowing
above its stop level?
Any LED off?
∗ An input overcurrent may result from wrong internal wiring. If the system is interrupted by an input
overcurrent after the wires have been disconnected and reconnected for part replacement, check the
wiring again.
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