Usage Tips:[Compatible Model] 520814 Ignition Control Circuit Module Board Replacement is compatible with the following model: SW4D / SW6D / SW6DE / SW6DEL / SW6DEM / SW6DM; SW10D / SW10DE / SW10DEL / SW10DEM / SW10DM; SW12D / SW12DE / SW12DEL / SW12DEM; W16D / SW16DE / SW16DEL / SW16DEM. This Water Heater Modul Board fits the SW series above serial number 953900766. Replaces Part Number: 520871, 520814, 520820 [Perfect Design] Used in 12 Volt DC furnaces and refrigerators. An electronic panel that produces high voltage spark ignition source. Produces current to open gas valve coils. Recognizes flame sense current. Three trials for ignition. For All Furnace And Water Heater Circuit Boards Including 520871 520814 520820. [Ignition Board Upgrade] If you're suffering from water heater running issues due to control board, such as Ignition of the gas flame was spotty, water heater has not fire, water heater shut off in seconds, maybe it's time to upgrade your control board. 520814 Water Heater Module Board replacement restores your equipment back to performance. [Safe & Sable Work] Constructed of premium-grade material and robust construction. Excellent moisture resistance for stable performance and reliable durability. Work well with the wiring as with the updated wiring. Colour:Photo Color Material:Plastic+Copper+Electronic Version Package Contents: 1x RV Ignition Control Circuit Module 1x Box Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.