Samsung AC018JN4DCH/AA Service Manual page 64

Troubleshooting
1. Test Item
1) Check the power supply of the outdoor unit.
2) Check the whole connection part of the power supply.
3) Check the power on the indoor unit.
4) Check the connection of the power supply of the terminal block.
5) Check the connection of the power supply between the Main EMI PBA of the outdoor unit.
6) Connect the power supply. (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
30 seconds after turning off the main power
switch (breaker or power socket),
turn on the power.
Check the power supply of
the outdoor unit.
1. Is the line voltage 380 Vac? (Yes)
L1(R) L2(S), L2(S) L3(T), L1(R)
2. Is the phase voltage to the neutral
line 220 Vac?
(Yes) L1(R)/L2(S)/L3(T) N
Check the power to the indoor unit.
1. Is the line voltage 220 Vac?
(Yes) 1(L) 2(N)
Check the connection of
the power supply between Main EMI PBA.
1. Is there a fault in the connection
of the power supply to Main PBA
and EMI PBA?
Continued
4-24
L3(T)
Yes
Yes
Yes
Check all power supply connections.
1. Check the power of the terminal box, 3-phase
electric power, and wire assembling.
2. If the connection is made in the power lines
No
(extension of the power line), check whether
the lines are firmly 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 the power line of the
No
terminal block.
1. Check wires are correctly connected by
referring to the electrical circuit.
Connect the power line
(First turn off the power of the terminal box!)
No
1. Connect the power supply.
2. Turn on the terminal box and check whether
normal power is supplied to the outdoor unit.
∙ 7-segment off.
∙ Conduct the following test if the mode is not
eco mode (power saving mode):
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