Troubleshooting
12-47Samsung Electronics
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Detection of Reverse Phase, Missing Phase of 3 Phase Power
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.)
Outdoor unit display
Indoor unit display (Operation) (Timer) (Fan) (Filter) (Defrost)
Judgment method
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, error is
automatically released.)
Causes 3 phase power L1(R), L2(S), L3(T) open error or not input 3 phase power
Check the main voltage.
Is error occurred again?
After switching off the power breaker,
exchange the 2 lines among the three lines of
3 phase inlet and check it again.
Is the voltage between
red~white/white~black/red~black of
CN82 power cable approximately
380V?
Replace the PCB because it is a defect of
3 phase detection circuit.
Search and manage the troubles of the
power cable or the circuit breaker with
measuring from 3 phase power inlet.
The reverse problem of inlet 3 phase
lines is solved, thus it operates normally.
Yes
Yes
No
No
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