Samsung SH12VCD Service Manual page 25

Troubleshooting
5-3-4 Check of indoor unit fan motor
Check whether the wire of fan motor is connected to the connector of control board (CN42,
CN71) of indoor unit.
Check whether the error mode displays after the strong revolution for approximately 15
seconds since aircon is on.
→ In case the error mode displays after the fan motor is rotating for 15 seconds
HALL IC of fan motor and Control board
→ In case that the error mode displays without running of fan motor after 15 seconds.
Operate with the pin of SSR(SS71) short of indoor unit control board and then if the fan
motor does not run, it is the fan motor defect.
If it rotates, it is the defect of control board (SS71, IC05, IC04).
5-3-5 Check of communication line between the indoor unit and outdoor unit
(Communication error mode)
1) Check of connection
Check whether the cable wire connecting the indoor unit with outdoor unit is correctly
connected to the (N1), 1, 2 terminal. (If the wire is connected reversely, the communication
error occurs)
If the cable connecting the indoor unit and outdoor unit is longer than 20m, error mode
occurs (shorten the cable length).
(Check of indoor unit)
Check whether the connection wire of the terminal block and control board of indoor unit is
correct.
(Control board)
JN
RY71
RY71
JC
(Check of outdoor unit)
Check whether the connection wire of the terminal block and control board of outdoor unit is
correct.
(Control board)
#1 of CN31
N
L
2) Check of power supply to the outdoor unit
After operation of aircon, select the turbo mode and approximately 3minutes later, check
whether the red color lamp of control board (to be seen if the top cover of outdoor unit) is on.
→ If the red lamp (LED 3) is not on, check the power part of control board of outdoor unit.
♦Check the connection of reactor.
→ If the red lamp (LED3) is on and green lamp is flickering, it is normal.
5-6
(Terminal block)
SKY-BLU
N
BRN
L
ORG
1
BLK
2
(Terminal block)
BLK
2
SKY-BLU
(N1)
BRN
1
SKY-BLU
(N1)
Defect of
Samsung Electronics