4-4-13.Reverse Phase / Loss Phase Detection (3-Phase Outdoor Unit) (Error Code : E425 ) - Samsung AC071MN4PKH Service Manual

4-4-13. Reverse phase / Loss phase detection (3-phase outdoor unit) (Error Code : E425 )
1. When power is on, it checks the power status used for 3-phase power compressor.
When the order of 3-phase L1(R) – L2(S) – L3(T) is changed (Reverse phase) or there is a phase that does not supply power (Loss phase), it will
display and the air conditioner will stop operating.
1) Check the voltage on L1(R) – L2(S) phase/ L1(R) – L3(T) phase/ L2(S) – L3(T) phase.
2) When there is any terminal that does not have normal voltage, check the external
power of the air conditioner and take appropriate measures.
3) If 3-phase power is normal check the phase of the power wire using 3-phasetester.
If it shows reverse phase, change the current power wire connection.
4) After completing above, press reset key (K3) then check the power again.
4-41
Troubleshooting
3-phase tester