LG LRG3091ST Service Manual page 71

CHECKING FLOW CHART BY FAILURE
Door lock system error
Normal?
Check the door locking motor (measure the resistance)
normal: approximately 2.6 kΩ
abnormal: infinite or below 5 Ω
Normal?
Check the looseness of CN03
Normal?
F-10 error
No
Yes
No
Yes
No
Yes
10-11
Replace the micro switch
END
Replace the door locking motor
END
Reconnect
END