LG LRE30451SW Service Manual page 58

F-CODE FLOW CHART
Oven too hot error F-9 error
Yes
Check for a welded broil relay.
(measure the resistance)
Welded Normal
Continuity Infinite
No
Normal?
Replace
Yes
the oven relay PCB(012B)
Replace
END
the main relay PCB(002A)
END
7-8