Replace Part Number:520820,521099,520741,520871,520814,33550L,AP4896608,520871 Compatible with:This rv furnace fan control ignition circuit board is specifically designed to fit for Suburban Furnace SF 20/25/30/35/42-F/Q/FQ, SFV 20/25/30/35/42-F, NT 12/16/20-S/SE, NT 16/20-SQ/SEQ, NT 24/30/34-SP, SH-35/42-F, DD-17DSI High-Quality Materials:Made with industrial grade components and sturdy PCB boards, ensuring stable operation even in RV and workshop environments with temperature fluctuations and vibrations.The control utilizes a microprocessor to continually and safely monitor, analyze and control the proper operation of the gas burner Easy Installation:A true plug-and-play replacement. Simply match the wiring connections and mounting holes to your old board. making installation straightforward for DIY enthusiasts or professionals.Before installation, please make sure to turn off all power and wear work gloves Service:Enjoy peace of mind with our 12-month hassle-free product return service. Our dedicated team is always eager to assist you and provide quick responses to any questions or concerns you may have during your purchase and use