Samsung APH289SEF Service Manual page 33

Troubleshooting
5-3-7 When remote control does not operate.
1. Causes of Failure
1) Low remote control voltage.
2) Poor receiving module of panel PCB remote control.
2. Inspection Items
1) Check "Beep" sound from the indoor unit panel. This indicates normal signal transmission from remote control.
3. Inspection Procedure
Turn power off and on in 5 seconds.
Press On/Off button on panel, then real
temperature displayed and start running?
Press On/Off button on remote control,
then "Beep" sound and stop running?
Check remote control battery voltage, over DC2.5V?
Press On/Off button on remote control
after exchanged, in normal operation?
Check wave style from panel PCB MICOM
Exchange panel PCB MICOM(IC101).
32
Yes
Yes
Yes
Yes
U101 Pin No. #20, spherical?
Yes
Check the inspection items
No
during power off.
No
Normal
No
Exchange the battery.
No
Exchange remote control.
No
Exchange panel PCB
receiving module.
Samsung Electronics