Samsung mini DVM Series, Service Manual

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Troubleshooting
12-3 Samsung Electronics
12-1-2 Reverse Phase/Missing Phase Detection (outdoor unit using 3 phase power)-
indicated if abnormal
1. If the power is on, check the power to be used for 3 phase power compressor.
If there is any change of order for 3 phase L1(R)-L2(S)-L3-(T) (reverse phase) or the phase power
(missing phase) which means the power is not on, E425 are indicated alternately and the air conditioner is kept to
stop.
1) Check the L19(R)-L2(S) phase/L1(R)-L3(T)
phase/L2(S)-L3(T) phase voltage.
2) If there is any terminal with not having the normal
voltage, check the external power of the air conditioner
and manage it.
3) If the 3 phase power is normal, check the phase of the
power cable using 3 phase tester. When reverse phase
is displayed, change the power cable connection.
4) Press reset key (K3) after above management and
check the power again.
K3
Display
Reset key
Wire for 3 phase
power check
3 phase tester