York S1-025-30889-000 Transformer the 100290345 is the current

the 100290345 is the current manufacturer-authorized replacement for the retired GKT1010 and 100146289 part numbers

verify the part number against your unit's specific technical guide or look for the 20-inch lead configuration on your current sensor

or the control board flashing a specific sensor-related fault code

Broad Compatibility: Fits a wide range of models including Weil McLain Ultra Series 2

verifying the continuity of this switch is a standard diagnostic step

York S1-025-30889-000 Transformer the 100290345 is the currentThe York S1 025 30889 000 Transformer is a heavy duty OEM HVAC control transformer engineered to step down 120V primary voltage to a stable 24V secondary output. Rated at 40VA and operating at 50 60Hz, this component provides essential low voltage power for thermostats, ignition modules, contactors, and integrated furnace control boards. Its foot mount design ensures a secure installation within the cabinet, while the spade terminal connections