Samsung DVM S ECO BIG Series Service Manual page 88

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