Disassemble the orfice/mixer and check for a flake or scale
obstructing the opening. Some orfices are adjustable. See if flame
height is about the same as the smaller burners. If lower, too small
an orfice may have been installed in this assembly. I saw one stove
that had the larger orfice in one of the small burners and it was a
much higher flame on this burner.
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