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Your cart is empty.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. Simple installation: Just clamp the resistor, unplug the integrator and control plug, and replace the new water heater circuit board. 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. 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.