123970 AERCO Boiler and Water Heater FLAME SENSOR

Normal Stock Item 

AERCO 123970 is the OEM Flame Sensor used on Benchmark (BMK) boilers and Innovation water heaters. Grounded search results give us a complete, authoritative profile of the part, including construction, function, and pricing.

🔧 Core Identity & Function

Part Number: 123970 Component: Flame Sensor / Flame Rod OEM: AERCO

This sensor uses flame‑rectification technology to verify the presence of flame during burner operation. It ensures the gas valve stays open only when a stable flame is detected, preventing unburned‑fuel accumulation and unsafe combustion conditions.

Technical Characteristics

• Technology: Flame rectification

• Construction: Stainless steel rod + high‑temp ceramic insulator

• Function: Confirms flame presence; triggers shutdown on flame loss

• Environment: High‑temperature condensing boiler chambers

• Compatibility: Benchmark (BMK) boilers, Innovation water heaters

Applications

Used in:

• AERCO Benchmark boilers

• AERCO Innovation water heaters

• Commercial hydronic heating systems

Typical replacement scenarios:

• Flame failure lockouts

• Short cycling due to weak flame signal

• Cracked ceramic insulator

• Soot‑covered or oxidized flame rod

AERCO 123970 Flame Sensor — OEM flame‑rectification sensor for AERCO Benchmark and Innovation systems. Provides precise flame detection to ensure safe burner operation, prevent unburned‑fuel accumulation, and maintain stable ignition performance. Built with stainless steel and high‑temperature ceramic for long‑life reliability in condensing boiler environments.