Samsung AVMKH020EA0 Service Manual page 258

8-2-76. The reverse phase of 3 phases power
Outdoor unit display
Indoor unit display
Judgment method
Causes
1. Check point
1. - Check the 3 phases detection power on the outdoor unit PCB.
1. - The color of power cable on L1(R), L2(S), L3(T) of 3 phases detection connecter is red, white, black.
(Be sure to change the color and order.)
Check the main voltage.
Is the voltage between
red~white/white~black/red~black
of CN82 power cable about
After switching power breaker off exchange
the 2 lines among the three lines of 3 phases
inlet. And check again it.
Is E425 error occurred again?
Replace the PCB because it is a defect of
3 phases detection circuit.
(Operation) (Timer)
- In case of being reversed the order of phases or not entered one or every phase voltage
- compared to the 3 phases detection circuit wave (If the phase voltage is return to normal,
- error is auto released)
- 3 phases L1(R), L2(S), L3(T) connection error/Not input 3 phases voltage
K1 K2 K3 K4
AC 380V?
Yes
Yes
- 257 -
(Fan) (Filter) (Removing frost)
No
Manage to the troubles with measuring
from 3 phases power inlet.
No
Normal operation
Troubleshooting
CN82
Power cable for check
3 phases power