Samsung AC026RN1DKG, Service Manual, Page: 192 / 257

Troubleshooting
4-36 Samsung Electronics
4-3-12 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.
3-phase tester