Samsung AQ09MSBN Service Manual page 49

3-2-2 Room Pipe sensor Error
Indoor unit heat exchanger temperature sensor error
(open or short)
1. Check the assembly condition of the sensor connector(CN43) on the indoor unit Main PCB and if not assembled, reassemble
the connector accurately.
2. Detach the room pipe sensor connector(CN43) and check the resistance between Pin #3 and #4.
Temperature( C)
15
20
25
If the above data is not met, replace the room pipe sensor.
3. Assemble the room pipe sensor to PCB, plug in, and check the voltage of connector 3 and 4. If the resistance is below 0.5V
or over 4.9V, replace the indoor Main PCB. (short or disconnected in the PCB board)
Samsung Electronics
Error Mode
Resistance Value(Kohm)
14.68
12.09
10
LAMP
Temperature( C) Resistance Value(Kohm)
30
35
40
Alignment and Adjustments
7-segment Display
Others
8.31
The data tolerance
6.94
is ±3%.
5.83
3-5