LG LRG3060ST Service Manual page 56

CHECKING FLOW CHART BY FAILURE
Main oven sensing error  F-1, F-2 error
Main oven sensing failed
Disconnect the power
Check the looseness of oven sensor connector
NO
COM
Normal?
Yes
Disconnect the main oven sensor and
check the main oven sensor value
(measure the resistance after cooling down)
Normal:approximately 1.06 kΩ at 65F
~ 1.12 kΩ at 85F.
Normal?
Yes
No
No
10-10
Reconnect
END
Replace the main oven sensor
END