LG LRG3091ST Service Manual page 74

CHECKING FLOW CHART BY FAILURE
Main oven sensing error
Main oven sensing failed
Disconnect the power
Check the looseness of oven sensor connector
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
F-1, F-2 error
No
No
10-14
Reconnect
END
Replace the main oven sensor
END