While the 7/8" connection sizes are identical

the O16-209 pressure switch is compatible with R12

a Ranco A12 series should be used

significantly increasing repair costs compared to a simple fuse swap

Diagnostic Efficiency: Allows for rapid burner flame inspection and troubleshooting of ignition sequences without system disassembly

Reznor 195644 Fan Blade 318820-201 While the 7/8" connection sizesThe Reznor 195644 Fan Blade is a critical OEM replacement component designed for compatibility with specific Reznor unit heaters and air handling systems. Engineered for precision airflow, this 10 inch diameter fan blade features a 17 degree pitch across its 5 blade configuration, ensuring optimal static pressure and heat exchanger efficiency. Built with a 3 8" bore, it facilitates a secure connection to the motor shaft, maintaining balanced rotation