Lennox 69W43 Flame Sensor Kit - (LB-74940B)

Specifications

• Manufacturer: Lennox
• Part Number: 69W43
• Manufacturer Number: LB-74940B
• Product Type: Flame Sensor Kit
• OEM Sensor: PSE-L79 (102431-02)
• Probe Style: 90° Angled
• Probe Diameter: 0.114"
• Overall Width: 4.687"
• Maximum Rod Temperature: 2190°F
• Maximum Ceramic Temperature: 1000°F
• Maximum Insulation Temperature: 250°F
• Weight: 0.08 lb (0.04 kg)
• OEM: Genuine Lennox Factory Replacement Part

Common Symptoms of a Failing Lennox 69W43 Flame Sensor Kit

If you're troubleshooting a furnace in Calgary, Edmonton, Red Deer, Lethbridge, Medicine Hat, or anywhere across Alberta, or in the Greater Toronto Area including Toronto, Mississauga, Brampton, Vaughan, Markham, Richmond Hill, Oakville, Burlington, Ajax, Whitby, and Oshawa, a failing flame sensor commonly causes:

• Burners ignite but shut off after a few seconds.
• Furnace repeatedly attempts to light before entering ignition lockout.
• No heat even though the ignitor glows normally.
• Intermittent heating operation.
• Ignition lockout or flame failure fault codes.
• Furnace cycles several times before remaining lit.
• Carbon buildup on the flame sensor causes a weak flame signal.
• Furnace may operate temporarily after cleaning the flame sensor before the problem returns.