Samsung SH09ZW8X Service Manual page 23

Troubleshooting
5-3-7 Room Pipe sensor failure
Description
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 connector 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)
5-3-8 When the remote control is not receiving.
1. Check if the connector was normally assembled.
2. Put the set in operation and check the voltage of No. 3(+) and No. 2(-) of the main PCB CN91 while operating the
remote control. When the voltage descends below 3V, the assembly module PCB is normal and the main PCB is poor.
Then replace the main PCB.
3. Replace the assembly display PCB because the module PCB is poor if the voltage between No. 2~3 of CN91
maintains 5V after the remote control starts operation.
22
Resistance Value(Kohm)
14.68
12.09
10
OPERATION
Temperature(˚C) Resistance Value(Kohm)
30
35
40
LAMP
TIMER TURBO
: Lamp off : Lamp flickering
Others
8.31
The data tolerance
6.94
is ±3%.
5.83
Samsung Electronics