Check Of Indoor Unit Fan Motor; Check Of Communication Line Between The Indoor Unit And Outdoor Unit; Communication Error Mode; Check Of Indoor Unit - Samsung SH09BWHA Service Manual

6-3-4 (E) Check of indoor unit fan motor
√ Check whether the wires are connected surely between control board(CN72) and running capacitor(Tab).
1.
√ Check whether the wire of fan motor is connected to the control board (CN73,CN44) of indoor unit.
1.
√ Check whether the error mode displays after the strong rotation for approximately 15 seconds since air conditioner turned on.
1.
• In case the error code displays after the fan motor is rotating for 15 seconds. → Defect of HALL IC of fan motor and/or control
1. √
board.
• In case that error code displays without fan motor rotating after 15 seconds. → Operate with making short circuit of AC side
1. √
pins of SSR(SS71) of indoor unit control board. And then if the fan motor does not operate, it is the fan motor defect.
If it rotates, it is the defect of control board(SS71,IC05,IC04).
6-3-5 (F) 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 N(1), 1, 2 terminal.
1.
(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 may occur (shorten the cable length).
1.

Check of indoor unit

√ Check whether the connection wire of the terminal block and control board of indoor unit is correct.
(Control board)
SKY-BLU
CN71
BRN
RY71
BLK
CN71
Check of outdoor unit
√ Check whether the connection wire of the terminal block and control board of outdoor unit is correct.
(Control board)
SKY-BLU
TB-N
BRN
TB-L
BLK
CN04
2. Check of power supply to the outdoor unit
2. 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 1) is not on, check the power part of control board of outdoor unit.
2.
2. • Check the connection of reactor.
→ If the red lamp (LED 1) is on and green lamp is flickering, it is normal.
2. •
6-3-6 (G) Check of discharge temperature sensor and comp top OLP temperature sensor.
√ Connector of outdoor unit control board
(PIN#3,4 of CN51 - discharge temperature sensor), (PIN#1,2 of CN52-OLP Temperature sensor)
Measure the resistance between two wires and if it is same as follows, it is normal but if not, replace.
Ambient temperature
(°C)
Resistance of
thermistor [KΩ]
Samsung Electronics
(Terminal block)
N(1)
1
2
(Terminal block)
N(1)
1
2
0°C 10°C 20°C
553 362 242
30°C 40°C 50°C
166 165 82
Troubleshooting
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