Samsung ACH1800E Technical Manual page 167

7
TROUBLE SHOOTING & ERROR MODE
Fault Diagnosis by Symptom
G EC19 : When the trouble is found on the part related to power system of output unit.
Check point :
- Outdoor unit AC220V~AC240V input power, DC12V output, DC5V output
- Power transformer, F101, F701
Check to confirm whether the wire is connected
correctly between indoor unit and outdoor unit?
Is the voltage between CN71 pin no. 3 and TB1
No trouble on F101, F701?
No trouble on the outdoor unit power system
166 | SAMSUNG
(Cont.)
AC220V~AC24V?
YES
YES
DC12V output?
YES
DC5V output?
YES
Check and replace power
transformer
and finish the test
NO
Check power code and replace PCB
NO
Replace fuse
NO
NO
Check and replace IC02
NO
Check and replace IC01
No check on power
transformer AC?
YES