Reverse Phase/Missing Phase Detection-P4 Indicated If Abnormal; To Check The Power To Be Used For 3 Phase Power Compressor If The Power Is On - Samsung DVM Series Service Manual

8-1-2. Reverse phase/missing phase detection - P4 indicated if abnormal

1. To check the power to be used for 3 phase power compressor if the power is on.

If there is any change of order for 3 phase L1(R)-L2(S )-L3(T) (reverse phase) or the power is not on,
Er and P4 are indicated alternately and the air conditioner is kept to stop.
1) L1(R)-L2(S) phase/L1(R)-L3(T) phase/L2(S)-L3(T)phase are checked.
2) If there is any terminal not having the normal voltage, check the external power of air conditioner for action.
3) If the 3 phase power is normal, it is the phase power is changed. Change two wires of incoming of power from
external side or incoming part of air conditioner.
For example, change L1(R) with L2(S).
4) Press reset key (K3) after above check and check the power again.
5) If there is abnormal condition even after one more check, check the color of 3 phase power.
If there is no abnormal as a result of check, replace the PCB.
clamp
communication line
single phase
AC220V supply
line
indoor power 3 phase power
supply line supply line
- 167 -
Display
K1
Reset key
K2
K3
K4
wire for 3 phase
power check
Troubleshooting