By maintaining the correct 45/30 degree differential

While some universal probes exist

reducing callbacks

Durable Alloy Construction: High-grade metal housing resists thermal expansion and corrosion in high-cycle environments

this component helps prevent heat exchanger damage and ensures safe operational parameters for Reznor unit heaters

York S1-025-26366-008 Limit Switch By maintaining the correct 45/30The York S1 025 26366 008 Limit Switch is a critical safety component designed for high limit protection in residential furnaces and air handlers. This automatic reset furnace switch is calibrated to open the electrical circuit if the heat exchanger temperature exceeds the 170F threshold and will automatically close once the temperature cools to 110F. For technicians troubleshooting a lockout, this York replacement part is essential for maintaining