York S1-025-35354-000 Flame Sensor

The York S1-025-35354-000 Flame Sensor is a critical safety component designed to detect the presence of a burner flame in gas-fired HVAC systems. It works by sensing the flame through electrical conductivity, sending a signal to the control board to keep the gas valve open during proper operation. This flame sensor is commonly used in York furnaces and other compatible heating equipment. It helps prevent gas buildup, enhances system safety, ensures reliable ignition, improves heating efficiency, and supports consistent furnace performance in residential and commercial HVAC applications.