Samsung ACH1800E Technical Manual page 165

7
TROUBLE SHOOTING & ERROR MODE
Fault Diagnosis by Symptom
G EC17 : When the trouble is found on the part related to ventilator of indoor unit.
Check point :
- Indoor unit PCB ↔ ventilator connector wire, output voltage of indoor unit micom pin No. 5
- Ventilator, DC 12V power, DC5V power, indoor unit option switch.
Is the wire correctly connected between indoor unit and outdoor unit?
after check of short circuit between indoor unit and ventilator wire, start the wind control and check the
indoor fan and then start the test.
Is the output DC112V, DC5V normal?
Is the option switch 1 of indoor unit off?
Is IC06 pin no. 7 "HIGH"?
Is IC06 pin no. 10 "LOW"?
Is the voltage across RY77 normal?
Is the voltage of CN6 no.1 and 3 of
indoor unit AC220V~AC240V?
Check and replace ventilator
164 | SAMSUNG
(Cont.)
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Check and replace IC01, IC02
Put off and then reset the power
Replace micom
Check and replace IC06
Check and replace RY77
Replace indoor unit PCB