York S1-025-35354-000 Flame Sensor the thermocouple is likely degraded

the thermocouple is likely degraded and failing to produce the required voltage to energize the valve coil

ignition leads and connectors are typically sold separately based on the total reach required for the burner chassis

Use a multimeter to check for continuity across the coil leads

ensure your subplate and mounting screws are intact

you should also consider V-9999-608 or V-9999-610 packing kits during the overhaul

York S1-025-35354-000 Flame Sensor the thermocouple is likely degradedThe York S1 025 35354 000 Flame Sensor is a critical safety component designed for precise flame rectified signal monitoring in high efficiency gas furnaces. As a veteran grade OEM furnace flame sensor, this unit features a high grade ceramic insulator and a durable Kanthal sensor rod, ensuring reliable microamp signal transmission to the integrated ignition control board. When the gas valve opens and ignition occurs, the York flame sensor replacement