York S1-025-27747-009 Limit Switch Frequent tripping usually indicates backdrafting

Frequent tripping usually indicates backdrafting

preventing nuisance trips and furnace lockout codes

allowing a technician to reset the radiator valve lock mechanism for seasonal adjustments or system re-balancing

This sensor features a durable ceramic insulator and a high-grade metal probe

Performance Integrity: Supports the Straight-Thru-Flow design to minimize frictional resistance and maximize flow capacity

York S1-025-27747-009 Limit Switch Frequent tripping usually indicates backdraftingThe York S1 025 27747 009 Limit Switch is a critical OEM furnace safety control designed to maintain thermal integrity within high performance heating systems. Engineered with a 140F trip point, this manual reset limit switch serves as the primary safeguard against heat exchanger overheating and potential cracked cells. As a genuine Source 1 replacement part, it ensures factory standard calibration for York, Luxaire, and Coleman gas furnaces,