Troubleshooting
4-58
Samsung Electronics
4-3-34 3-phase Input Wiring error
1. Cause of problem
Replace the MAIN PCB.
Connection and then restart it
Power BOX Terminal : Check the phase-to-phase
connection 380V of the R, S, T and then restart.
(N-phase must be properly connected.)
No
No
Yes
Yes
Did the Reactor
Connection Terminal is connected
properly?
Did the Main
Terminal Block and Power R, S, T, N is
connected properly?
Low voltage error during this initial charge :
Replace Fuse, if the rectifier diode of the
inverter PCB is normal.
No
No
Did the EMI PCB Fuse is short?
Connection and then restart it
Yes
Yes
Is EMI PCB CN21
connector and Inverter PCB accurately
connected?
Power Off
Outdoor unit
display
Indoorunit
display
Duct, Cassette (1/2 Way),Console, Celing
Cassette (4/Mini4 Way)
Wall-mounted (NeoForte)
Operation Defrost
Timer
Fan Filter/MPI Operation Defrost
Timer Filter Operation Timer
Turbo
×
×
◑
◑
◑
×
◑
◑
◑
●
◑
◑
※ ●
: ON
◑
: Flash ×: OFF
Judgment
Method
. When turn on the power and check the status of the power from the inverter.
If the phase does not connect the power(no phase) : E425 or E466 (E366) is displayed
(Air conditioner to maintain the normal state.)
However) N-phase must be properly connected.
Cause of
problem
∙ Check the input wiring
∙ EMI Fuse short
