This unit is specifically built with a 1/2 inch NPSM internal thread (or standard thermometer thread) to accept industrial series glass thermometers or bimetal gauges

Manual reset button prevents the system from automatically restarting under unsafe conditions

Repeated activation of the York rollout switch often indicates a blocked flue

protecting system components from operating outside of designated thermal parameters

Fenwal 05-100000-422 Ignitor Sensor This unit is specifically builtThe Fenwal 05 100000 422 Ignitor Sensor is a precision engineered flame sensor designed for high performance gas ignition systems. As a direct replacement for 22 100000 551, this component is critical for flame rectification, ensuring the ignition control board accurately detects the presence of a flame to maintain safe combustion. Built with high quality glazed Alumina ceramics and robust rod metals, this sensor is designed to withstand extreme