There is a flame sensor located in the last burner that lights up. It is either not seeing flame or not getting flame to it within a certain time. Check the wire that comes from it and goes to the circuit board for a bad connection. Check any ground wire connections for a bad connection. Pull out flame rod (sensor) and polish it with a scrub pad or soft wire brush. If none of these recommendations help, replace the flame sensor. Make sure the flame travels to the last burner, if not, clean the flame tray that allows the flame to go from one burner to another.
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