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.
20467101 – FLAME SENSOR (52M72)
$32.39
Lennox 52M72 flame sensor (part 20467101). Genuine OEM replacement for Lennox furnaces. Detects burner flame to keep your furnace running safely.
Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm | In-Store Pickup Only
Description
If your furnace lights but shuts off after a few seconds, a dirty or failed flame sensor is the most likely cause. The 52M72 is a genuine Lennox OEM flame sensor — part number 20467101 — that ensures the control board knows the burner is lit.
Specs: OEM Lennox, part number 20467101, ceramic insulator, Kanthal sensing rod
Replaces: 52M72, 20467101
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.
