Samsung mini DVM Series Service Manual page 458

■ Detection of Reverse Phase, Missing Phase of 3 Phase Power
Outdoor unit display
Indoor unit display
Judgment method
Causes
1. Check point
1) Check the power of the 3 phase detection part on the outdoor unit PCB.
2) The color of the power cable on 1(R), L2(S), and L3(T) of the 3 phase detection connector is red, white, and black.
(Make sure not to change the color and order.)
Check the main voltage.
Is the voltage between
red~white/white~black/red~black of
CN82 power cable approximately
After switching off the power breaker,
exchange the 2 lines among the three lines of
3 phase inlet and check it again.
Is
Replace the PCB because it is a defect of
3 phase detection circuit.
Samsung Electronics
(Operation)
In case the order of phases is reversed or one or every phase voltage is not entered compare to
the 3 phase defect circuit wave. (If the phase voltage is returned to normal,
automatically released.)
3 phase power L1(R), L2(S), L3(T) open error or not input 3 phase power
380V?
Yes
error occurred again?
Yes
(Timer) (Fan) (Filter)
Search and manage the troubles of the
No
power cable or the circuit breaker with
measuring from 3 phase power inlet.
No
The reverse problem of inlet 3 phase
lines is solved, thus it operates normally.
Troubleshooting
(Defrost)
error is
12-47