Samsung AM032MNQDCH/AA Service Manual page 301

4-4-58 3-phase Input Wiring error
Outdoor unit display
Indoorunit display ×(Operation)
. When turn on the power and check the status of the power from the inverter.
If the phase does not connect the power(no phase) : E425 or E466 (E366) is displayed
Judgment Method
(Air conditioner to maintain the normal state.)
However) N-phase must be properly connected.
∙ Check the input wiring
Cause of problem
∙ EMI Fuse short
1. Cause of problem
Terminal Block and Power R, S, T, N is
connected properly?
Connection Terminal is connected
Did the EMI PCB Fuse is short?
Is EMI PCB CN21
connector and Inverter PCB accurately
Replace Inverter PCB
Samsung Electronics
(Reservation)
Power Off
Did the Main
Yes
Did the Reactor
properly?
Yes
No
connected?
Yes
(Blast) (Filter) ×(Defrost)
Power BOX Terminal : Check the phase-to-phase
No
connection 380V of the R, S, T and then restart.
(N-phase must be properly connected.)
No
Connection and then restart it
Low voltage error during this initial charge :
No
Replace Fuse, if the rectifier diode of the inverter
Yes
Connection and then restart it
Troubleshooting
PCB is normal.
4-101