the 5651-191BX is the exact same component as the 5651-191

Advanced Diagnostics: Multi-color LED provides instant status of oil pressure and timing circuits for faster service calls

ensuring a bubble-tight seal and reliable shifting for pneumatic valve systems managing air

reducing the need for additional field-sourced components

The included user interface manages the interface between the motor and the HVAC controls

Lennox 12L09 Flame Sensor 321894-708 the 5651-191BX is the exactThe Lennox 12L09 Flame Sensor is a critical genuine OEM replacement part engineered for precise flame rectification in Lennox residential furnaces and heating units. This HVAC flame sensor functions as a safety probe, generating a microamp signal to the integrated furnace control board to verify successful ignition of the burner assembly. If the sensor detects a loss of flame, it triggers a system lockout to prevent hazardous gas accumulation. Built