OEM Carrier Flame Sensor for PG9MAA024040ABKA 80% Gas Furnace

The flame sensor is the safety device that proves your Carrier PG9MAA024040ABKA furnace truly ignited before the control board keeps the gas valve open. It works by flame rectification: a few microamps of current flow through the burner flame to ground, confirming combustion. As the rod oxidizes or cracks, that signal weakens and the board can no longer confirm flame, so it closes the gas valve within a couple of seconds for safety. Homeowners notice short-cycling — burners light, run briefly, then shut off, repeating several times before the furnace locks out and the diagnostic LED flashes a flame-sense code. The result is a furnace that teases a little heat but never finishes a cycle. The part is a single sense rod in a ceramic insulator. With a strong flame a clean rod typically reads about 2-6 microamps DC; once it drops under roughly 0.5-1.0 microamps the board aborts the cycle. A hairline crack in the ceramic causes erratic, drifting readings and intermittent lockouts that return even after cleaning. OEM matters because the rod's length and bend place it at the correct immersion depth in the flame. A generic sensor positioned too shallow or built with a thinner rod yields a marginal, unstable microamp signal — fine on a mild day, but prone to nuisance lockouts on the coldest mornings when the furnace cycles hardest. Install difficulty: 1 of 5. Tools: 1/4" nut driver and fine emery cloth or a Scotch-Brite pad. SAFETY: shut off the furnace gas valve and the breaker, and let the burner box cool before removing the sensor. Ships same business day from our stocked warehouse on orders placed before 3 PM CST. Backed by a 1-year OEM warranty and 30-day hassle-free returns on uninstalled parts.

Compatibility

This part is compatible with Carrier model PG9MAA024040ABKA. Always verify the part number against your unit's data plate before ordering.

Why Choose OEM?

OEM parts are manufactured to the exact factory specifications for your unit. Generic aftermarket alternatives may fit physically but often use lower-rated components that reduce equipment life and void manufacturer warranties. When the cost difference between OEM and generic is $10-30, the OEM part is always the smarter investment on a system worth $5,000-$15,000.

Shipping & Returns

Same-day shipping on orders before 3 PM CST. Standard delivery 2-5 business days, express options available at checkout. 30-day hassle-free returns on uninstalled parts — free return shipping included. 1-year OEM factory warranty coverage.