Overvoltage / Low Voltage Error - Samsung AM007FN1DCH/AA Service Manual

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
Did the EMI PCB Fuse is short?
Replace Fuse, if the rectifier diode of
the inverter PCB is normal.
4-114
(INVERTER1 PCB)
(INVERTER2 PCB)
Power Off
380V is the voltage
between terminal blocks
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