Troubleshooting
4-46 Samsung Electronics
■ Phase reversal or phase failure(3Ø outdoor unit wiring, R-S-T-N), connection error on 3 phase
input. (E-425)
Power Off
Did the Main
Terminal Block and
Power R, S, T, N is
connected properly?
Yes
No
Low voltage error during this initial charge :
Replace Fuse, if the rectifier diode of the inverter
PCB is normal.
Did the Reactor
Connection Terminal is
connected
properly?
Did the EMI PCB Fuse
is short?
Yes
Power BOX Terminal : Check the phase -to-phase
connection 380V of the R, S, T and then restart.
(N -phase must be properly connected.)
Connection and then restart it
No
No
No
Is EMI PCB CN21
connector and Inverter
PCB accurately
connected?
Yes
Yes
Connection and then restart it
Replace Inverter PCB
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