Push Button Ignition Not Working

My push button ignition doesn't work anymore. What could have gone wrong?
The Sure-Lite" starting system is a two part system consisting of the push button and the electrode. The button is almost fail safe, if it clicks, then it works. Sometimes the electrode will develop a build up of grease or oxidization that may hamper the performance of the spark. Most times this can be rectified by cleaning the electrode with a brush or carefully with a piece of sandpaper.