Before replacing, try cleaning the sensor rod with fine steel wool or a dollar bill. That fixes it about half the time. If it still shuts off after 3–5 seconds, replace it.
51M14 – FLAME SENSOR (LENNOX, AFTERMARKET, DIRECT, FLS51M14)
$23.18
Lennox 51M14 flame sensor, single-prong design. Aftermarket direct replacement for multiple Lennox furnace models. Also listed as FLS51M14.
10226 Plano Rd, Suite 104, Dallas TX 75238
Questions? Call or text (214) 340-9421
Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm
Description
If your furnace lights but shuts off after a few seconds, a dirty or failed flame sensor is the most likely cause. This aftermarket sensor is a direct replacement for the Lennox 51M14 — same dimensions and mounting, fits right in.
Specs: Single-prong design, ceramic insulator, direct fit for Lennox 51M14
Replaces: 51M14, FLS51M14
Fits: Lennox gas furnaces
Need help? See our Furnace Not Heating Guide.
In stock at Open To Public HVAC Parts in Dallas. We test parts at the counter before you buy. Call or text (214) 340-9421.
