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Start by cleaning all the burners and electrodes with a wire brush and if you can remove the burners, wash them in hot soap and water and reinstall. Sometimes they just need a good cleaning, but if you can't get them very clean then you need to replace the burners. If that does not work, and the arc from the electrode to burner seems weak, then replace the spark module. If you have any more questions, please ask, but this should take care of it. Please don't forget to rate me for my service tonight. Thanks!