The Lennox 69W43 Flame Sensor is a Lennox flame sensor for HVAC repair and replacement work. Use it when the part number 69W43 and the listed specifications match the equipment being serviced.
69W43 is an official OEM Flame Sensor for Lennox HVAC equipment.
Captured replacement references include LB-74940B, 790-843A1, 790-801A1. Confirm supersession details against the manufacturer parts list.
Reviewed by the SuperArbor Pro Desk: choose this part when the existing component label and unit documentation match 69W43 and the spec set above. It is best suited for targeted HVAC service repairs where exact fitment matters more than broad universal compatibility.
It is a flame sensor for compatible Lennox HVAC equipment. Match the part number 69W43 and the equipment service literature before ordering or installing.
Verify the spec set shown for this part: Product Type: Flame Sensor. The replacement should match the existing component and the unit documentation.
Compare the part number 69W43, the flame sensor description, and any unit model references with the original component and the service manual.
Captured cross-reference data includes LB-74940B, 790-843A1, 790-801A1. Verify any supersession directly against the manufacturer parts list before installation.
A qualified HVAC technician should install and test the flame sensor. Disconnect power first, follow lockout procedures, and confirm safe operation after replacement.
Disconnect power before service. HVAC electrical and combustion-related components should be installed and tested by a qualified technician. After installation, confirm wiring, mounting, airflow or fluid routing as applicable, and normal system operation.
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