If the plate is cracked or the contacts or the metal grid on the plates are dirty. Take the plate out and inspect for cracks, if it is damaged replace the plate. If the plate is dirty, it can be cleaned with a solution of 1 part amonia and 1 part water. Scrub the metal grid portion of the plate with an old toothbrush and let it sit for about 10 minutes then rinse it off using water. You can clean the contacts with the same amonia solution. Allow the contacts to dry overnight or use a hair dryer to speed up the drying the plate.
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If the plate is cracked or the contacts or the metal grid on the plates are dirty. Take the plate out and inspect for cracks, if it is damaged replace the plate. If the plate is dirty, it can be cleaned with a solution of 1 part amonia and 1 part water. Scrub the metal grid portion of the plate with an old toothbrush and let it sit for about 10 minutes then rinse it off using water. You can clean the contacts with the same amonia solution. Allow the contacts to dry overnight or use a hair dryer to speed up the drying the plate.
Hope this helps.