One burner is continuously sparking/clicking. There is a small orifice in the burner head, adjacent to the igniter electrode, which produces a small flame directed onto the electrode. When the burner is set to a low setting, this flame is present and there is no sparking. When the burner is turned up, the small flame disappears and the sparking starts. The burner operates fine, apart from the sparking. I have swapped the burner head with another burner but there was no change.
Does anyone have a suggestion how to fix this?