Samsung AM072BXV Series - Overvoltage; Low Voltage Error

Samsung Electronics 136
Troubleshooting
4-3-47 / Overvoltage / Low voltage error
Outdoor unit display
(INVERTER1 PBA)
(INVERTER2 PBA)
Judgment Method
• Input wiring error EMI fuse open.
• DC-Link Overvoltage / Low voltage occurs.
Cause of problem
- Check the power source wiring. (R/S/T/N wire crossed or not connected)
- Check the power source voltage. (Rated voltage ±10%)
- Check the fuses on EMI PBA. (fuse is normally short)
1.
Cause of problem
4-3 Appropriate Measures for Different Symptom (cont.)
Power Cable re-connection
No
Yes
Is Power
connection accurately
conected?
Power Off
Check the connector connection
No
Yes
Is EMI PBA
R,S,T Wire and Terminal-block
connector accurately
connected?
No
Yes
Did the Fuse is short?
Type of
Power Source
AC Input
Voltage
Standard AC Voltage(Vac) Standard DC Voltage(Vdc)
Min. Max. Min. Max.
F 208~230V 177 265 250 374
J 460V 391 552 553 781
No
Yes
Is Reactor
accurately connected
Check the Reactor
connection
No
Yes
Is Inverter
PBA R,S,T Wire and EMI PCBA
connector accurately
connected?
Power Off and then
re-connection
Replace Inverter PBA
No
No
Is the resistance
value between different
phases of Compressor. (U ↔ V, V ↔ W,
W ↔ 
Is the resistance
between the body of Compressor and

Replace Compressor
Replace Compressor