LG LRG3091ST Service Manual page 70

CHECKING FLOW CHART BY FAILURE
Door lock system error
Door lock failed
Disconnect the power
Check the terminal looseness of micro switch
and door locking motor
Normal?
Check the oven door lock switch(micro switch)
(measure the resistance → Normally open type)
NO
COM
F-10 error
No
Yes
Door latch Door latch
open Locked
Continuity Infinite
10-10
Reconnect
END