Samsung AM032MNQDCH/AA Service Manual page 318

Troubleshooting
4-4-76 Overvoltage / Low voltage error
Outdoor unit display
∙ N-phase wiring error and EMI Fuse short.
Judgment Method
∙ DC-Link Overvoltage / Low voltage occurs.
∙ Check the input wiring
Cause of problem
∙ EMI Fuse short
1. Cause of problem
380V is the voltage
between terminal blocks
Did the EMI PCB Fuse is short?
Replace Fuse, if the rectifier diode of
the inverter PCB is normal.
4-118
(INVERTER1 PCB)
(INVERTER2 PCB)
Power Off
R, S, T wire?
Yes
Yes
No
Power R, S, T, N wire voltage check and restart it.
No
Replace Inverter PCB and then restart it.
* Check the 3-phase sensing circuit part.
Samsung Electronics