Troubleshooting
4-28 Samsung Electronics
4-3-8 When the outdoor unit power is not ON - Initial Diagnosis : 3-phase products
1. Test items
1) Check the power connection of outdoor unit.
2) Check the whole connection part of the power wire.
3) Check the power on the indoor unit.
4) Check the connection of the power wire of the Terminal Block.
5) Check the connection of the power wire between the Main↔EMI PBA of the outdoor unit.
6) Connect the power wire. (Never forget to turn off the power of the Terminal Box).
7) Check the power supply parts. (Check after turning off the power of the Terminal Box!)
8) Check everything is normal after separating the fan motor connector and resetting the power.
(Separate the connector after turning off the power of the Terminal Box! When detaching and attaching the connector
during power supply, the motor can be damaged.))
2. Check procedure
Eco-mode (power saving mode).
Yes
Yes
Yes
30 seconds after turning off the Main Power
Switch (Breaker or Power outlet),
turn on the power.
Check all power wire connections.
1. Check the power of the terminal box, 3-phase power
phase, and wire assembling.
2. If the connection is made in the power wire
(extension of the power wire), make sure that it is
securely connected.
3. Check the circuit breaker due to over-current, or
leakage. Check whether several units are connected
to one breaker.
Check the connection of Terminal Block power wire.
1. Check whether each wires were connected rightly.
(Refer to electrical schematics)
Connect the power wire (First turn off the power of the
Terminal Box!)
1. Connect the power wire.
2. Turn on the Terminal Box and check whether normal
power is supplied to the outdoor unit.
No
No
No
Check the power
supply of the outdoor unit.
1. Is the wire voltage 380Vac? (Yes) L1(R)↔L2(S),
L2(S)↔L3(T), L1(R)↔L3(T)
2. Is the phase voltage to the neutral wire 220Vac?
(Yes) L1(R)/L2(S)/L3(T)↔N
Check the power to the indoor unit.
1. Is the voltage 220Vac between the wires?
(Yes) 1(L)↔2(N)
Check the
connection of the power supply
between Main↔EMI PCB.
1. Is there a fault in the connection of the power
supply to Main PCB and EMI PCB?
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