LG LSWS305ST Service Manual page 47

CHECKING FLOW CHART BY FAILURE MODE
lock system failure(including F-10 error)
Check the locking motor (measure the resistance)
Normal : approximately 2.6 kΩ
Abnormal : infinite or below 5 Ω
Check the loose connector (Oven main PCB CN08)
Is the connection OK?
Check the Relay PCB's electric connection (CN01, CN03)
Check the connection between system
PCB and relay PCB(CN11)
Replace the System PCB
Yes
No
OK?
Yes
1 2 3
No
Yes
No
OK?
Yes
OK?
END
1
5-15
Replace the locking motor
END
Fix the connection
END
Replace the Relay PCB