Samsung ACH1800E Technical Manual page 157

7
TROUBLE SHOOTING & ERROR MODE
Fault Diagnosis by Symptom
G EC09 : When the trouble is found on the part related to the wireless receiving board of the indoor
unit.
Check point :
- Defect of wireless remote controller PCB
- Defect of wireless remote controller receiving board PCB
- Indoor unit PCB defect
LED direct/reverse direction check?
LED direct/reverse direction check?
Check pin no.1 of CN9 while pressing
Replace after check of indoor unit main PCB
156 | SAMSUNG
Mis-insertion of CN9?
NO
Wire shorted?
NO
NO
YES
SW91 : DC 0V?
YES
(Cont.)
YES
NO
NO
NO
NO
Replace the wireless receiving board
Insert correctly