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Your cart is empty.Part number: 520814 Water heater ignition control circuit board Replace 520814, 520820, 520871, 33550L, AP4896608. Function: Monitor and control the combustion process, optimize the combustion efficiency of the water heater. Ignition control circuit board features overheat protection and leakage protection. Compatible model: Water heater control board compatible SW4D, SW6D, SW6DE, SW6DEL, SW6DEM, SW6DM, SW10D, SW10DE, SW10DEL, SW10DEM, SW10DM, SW12D, SW12DE, SW12DEL, SW12DEM, SW16D, SW16DE, SW16DEL. Solve problem: The RV water heater circuit board perfectly solves the problem of ignition control board failure, so that you can use hot water again. If you have any problems please kindly contact us by logging in your Amazon Buyer Account, Find your order and click Contact Seller we will respond you in one business day.