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.
69W43 – FLAME SENSOR (LENNOX, AFTERMARKET, DIRECT, 790-801A1)
$34.12
Lennox 69W43 flame sensor replacement with 90-degree bend. Direct aftermarket fit for Lennox furnaces. Also listed as 790-801A1 and 102431-02. Single-prong Kanthal rod.
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 flame sensor is a direct replacement for the Lennox 69W43 — same fit, same function, at a fraction of OEM cost.
Specs: 90-degree angled design, Kanthal sensing rod, ceramic insulator, single mounting hole
Replaces: 69W43, 69W4301, 102431-02, 790-801A1, LB-74940B, PFS043
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.
