The burner will not light with the igniter, but will light with a match what is wrong?
Slipping igniter knob - Ensure that knob is pushed firmly onto igniter. When installed correctly, it is difficult to remove.
Loose electrode wire - Check that electrode wire is firmly pushed onto the terminal on the back of the igniter.
Improper gap at electrode tip - Ensure that the collector box is tight, and the gap between the electrode end and the collector box is between 1/8 - 3/16". The gap can be adjusted by bending the box in or out.
Lifting flames on burner- Close air shutter slightly - see previous problem.