Samsung ACH2400C Service Manual page 39

Trouble Shooting
EC18 : When the trouble is found on the part related to power system of indoor unit.
Check point :
- Indoor unit AC208V~AC230V input voltage, DC12V output, DC5V output, output voltage of pin no.2 and 3 of CN15.
- Power transformer, F101, F102, F701
After checking the correct connection between
indoor unit and outdoor unit, and check again
Is the voltage of pin no.1 and 3 of CN1
AC208V~AC230V?
YES
No trouble on F101, F102, F701?
YES
DC12V output?
YES
DC5V output?
YES
No trouble on the power system and finish the test
38
NO
Check the connection wire of indoor and outdoor
and then replace indoor unit PCB
NO
Replace fuse
NO
NO
Check and replace IC02
Check and replace power
transformer
NO
No trouble on power
transformer AC output?
YES
Check and replace IC101