Samsung AVMKH020EA0 Service Manual page 188

8-2-5. Reverse phase detection of 3 phase power
Outdoor unit display
Indoor unit display
Judgment method
Causes
G Check items
- Check the 3 phase detection part power of outdoor unit PCB.
- Check the color of red, white and black of the cable for 3 phase detection part connectors L1(R), L2(S) and L3(T)
(Take care that the color and sequence are not changed.)
Check power of main parts
Is CN77 cable
red ~ white/ white ~black/ red ~
black voltage AC380V?
Yes
Exchange two wires of 3 phase
incoming ones and press
the reset key (K3) and then retry.
P4 reappears?
Yes
Since it is the trouble on the 3 phase
detection circuit part, replace the PCB.
(Operation) (Timer)
- One of the phase voltages or all of them are not incoming, comparing the
- sequence of 3 phase circuit wave
- (P4 error is automatically reset when the phase voltage is restored)
- l Incorrect connection of 3 phase power L1 (R), L2(S) and L3(T)/ 3 phase power is not on
- 187 -
(Fan) (Filter) (Removing frost)
red white black
wire for 3 phase
power check
No
Measure the incoming part of 3 phase
power to find the problems on the
wire and circuit breaker for action.
No
Since the problems of incoming 3 phase
cable changed is solved,
normal operation is possible.
Troubleshooting
CN77 YEL