Professional Grade Construction: Built with high-temperature resistant alloys to withstand constant thermal stress within the combustion chamber

Common indicators include the furnace blower running continuously

A419 and A421 electronic controls

By replacing worn or ruptured diaphragms

and 30CHDE series

York 024-34681-000 Pressure Switch Els PW 17895 Professional Grade Construction: Built withThe York 024 34681 000 Pressure Switch is a critical safety component designed for precise monitoring of pressure differentials in York HVAC systems. This OEM York replacement part features a reliable Normally Open (N O) contact configuration with specific set points of . 85 1. 0 . 40" WC. Engineered to ensure proper drafting and combustion blower operation, this differential pressure switch prevents the heating cycle from initiating if hazardous