For high-altitude applications

measuring exactly

When diagnosing a pilot light that won't stay lit

Repeated tripping usually indicates restricted airflow

This technical kit is essential for equipment transitions

York S1-025-41321-000 Limit Switch For high-altitude applicationsDesigned for professional field installation, the York S1 025 41321 000 Limit Switch is a critical safety component for maintaining thermal integrity in high efficiency furnaces and packaged HVAC units. This genuine OEM replacement part features a precision calibrated thermal disc engineered to open the control circuit at 150F if internal temperatures rise above safe operating parameters, preventing equipment damage and hazardous conditions. Once the