Samsung AM080 XV Series Service Manual page 135

Reversed Phase/No Phase Check (Outdoor Unit with 3 Phase power) – Display
1 . When the power is on, check the status of the power from the inverter.
Three-phase L1(R)-L2(S)-L3(T) order, regardless of the power connection on the inverter does not phase power (no phase) can occur.
In this case, E425 or E466 (E366) is displayed, and then air conditioner will then maintain normal conditions.
However) N phase must be connected properly.
1) Check the voltage for L1 (R)-L2 (S) phase/L1 (R)-L3 (T) phase/L2 (S)-L3 (T) phase.
2) If there is any terminal without normal voltage, then check the power outside the air conditioner and take the appropriate measures.
3) If the 3-phase voltage is normal, then use the 3-phase tester to display the phase of the power cable.
Change the power cable connection if reversed phase is displayed.
4) Take the above measures, press the reset key (K3), and then check the power once more.
5) Check the EMI PCB Fuse connection and wiring.
6) If the same problem occurs after another check, check the Inverter PCB.
In case of wiring error (N-phase is changed with one of R, S and T) with the N-phase, will operate the power protection
function, display E425 or stop the power. This is not a PCB power defect in this case, before PCB replacement, please
CAUTION
check the power on.
Samsung Electronics
E425 Table part
RESET KEY
Troubleshooting
for Problem
4-15