the McDonnell & Miller 312200 is the official updated part number that replaces the discontinued 311100

Voltage Regulation: Rated for stable operation on 115B circuits

this component monitors internal heat levels within the furnace cabinet to protect the heat exchanger from thermal excursions

extending the service life of the component in demanding HVACR applications

this safety component monitors the burner vestibule for flame rollout conditions

Heil Quaker ICP 1006298 Tube Sensor the McDonnell & Miller 312200The Heil Quaker ICP 1006298 Tube Sensor is a precision OEM replacement part engineered for critical temperature and pressure monitoring in high efficiency natural gas furnaces. Featuring a 3 16" I. D. silicone tube with a 36 inch lead, this component provides real time diagnostic feedback to the integrated furnace control board. Designed for heavy duty HVACR cycles, the sensor ensures precise flame detection and pressure regulation, preventing short