York S1-2702-311P Flame Sensor

The York S1-2702-311P is a precision-engineered OEM replacement component essential for maintaining the flame rectification circuit in gas-fired heating systems. Featuring a specific 90 degree bend, this HVAC flame rod is designed to sit directly in the burner’s path to detect the presence of flame via ionization. Manufactured with high-grade alumina ceramic insulation and a durable metallic rod, the S1-2702-311P ensures that the furnace control board receives a consistent microamp signal, preventing nuisance lockouts and safety shutdowns. When performing a York flame sensor replacement, technicians rely on this York furnace part for its exact fitment in York, Luxaire, and Coleman residential furnaces. Its robust construction is built to withstand extreme thermal cycling without degradation, ensuring the ignition sequence remains reliable throughout the heating season. Replacing a carbon-fouled or oxidized 90 degree flame sensor is standard practice for restoring peak furnace performance and ensuring contractor-grade reliability.

• Genuine OEM part ensures direct compatibility with York, Coleman, and Luxaire burner assemblies.
• High-temperature terminal and rod construction for long-term resistance to oxidation.
• Precision-molded 90-degree geometry for optimal flame impingement.
• High-dielectric ceramic insulator prevents signal leakage to the chassis ground.

Why is my York furnace not staying lit?

A furnace that ignites but shuts down within seconds often has a dirty or failed S1-2702-311P. If the sensor cannot send a microamp signal to the board, the gas valve is closed for safety.

How to replace flame sensor S1-2702-311P?

First, disconnect the power. Remove the 1/4" hex screw holding the sensor in place, disconnect the wire lead, and install the new sensor. Ensure the rod is properly positioned in the flame path.

Does a 90 degree flame sensor need cleaning?

While soot can sometimes be removed with an abrasive pad, deep oxidation or cracks in the ceramic insulator require a full replacement to ensure the system operates within manufacturer specifications.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.