York S1-028-12012-700 Sheave R-407A often accompanied by a "waiting

often accompanied by a "waiting for blower prover" or "air pressure switch open" fault code on the control board

Designed for high-altitude applications up to 4500 feet

the switch will close the circuit to allow for the next heating cycle

this HVAC gas control valve offers reliable terminal connections and a rugged housing built to withstand the thermal cycling typical of high-efficiency equipment

This model is the official replacement for S1-024-26056-000

York S1-028-12012-700 Sheave R-407A often accompanied by a "waitingThe York S1 028 12012 700 Sheave is a precision engineered OEM replacement pulley designed for high demand HVACR mechanical drive systems. Featuring a specific 1. 1875" bore (1 3 16 inch), this fixed pitch sheave is critical for maintaining the correct blower RPM and ensuring optimal static pressure within your air handler or rooftop unit. This single groove sheave (BK110 series) typically accommodates 4L, A, 5L, or B section V belts, providing the