[Part Number Compatibility] The RV Furnace Ignition Circuit Board replacement features multiple referencing part numbers including 520820, 521099, 520741, 520871, 520814, 33550L, and AP 4896608. Before purchasing, please verify that these part numbers are compatible with your RV furnace model for optimal performance. [Intelligent Control Features] The RV Furnace Control Ignition Circuit Board intelligently manages the spar k ignition and gas valves of your RV furnace. It automatically initiates a safety lockout after three ignition failures, utilizing real-time synchronization of gas and electric operations to prevent malfunctions and stabilize water temperature for consistent and regulated heating. [Wide Compatibility] This RV Furnace Heater Circuit Board is designed as a direct replacement for SF 20 25 30 35 42-F Q FQ; for SFV 20 25 30 35 42-F; for NT 12 16 20-S SE; for NT 16 20-SQ S E Q; for NT 24 30 34-SP; for SH-35 42-F; for DD-17DSI. [Durable Construction] Crafted from PC materials, this RV Furnace Ignition Control Module promises enduring reliability and maintenance efficiency. Its robust design makes it resistants to damage, ensuring a long service life, and consistent performance, which is crucial for maintaining comfort in your RV. [Convenient Installation] Designed for straightforward installation, this replacement circuit board facilitates the efficient maintenance and repair of RV furnaces. The easy direct installation process means you can replace your old unit with minimal effort while following standard factory procedures for a reliable fit., Manufacturer: Jelquix