OEM Carrier Flame Sensor for PG9MAA036040AAKA 90% Gas Furnace

The flame sensor in your Carrier PG9MAA036040AAKA furnace is a single metal rod positioned in the burner flame that confirms to the control board that the burners have actually lit. It relies on flame rectification: the flame conducts a small DC microamp current through the rod, and if the board doesn't detect that current within a few seconds of ignition it closes the gas valve for safety. As the rod builds up a thin oxide/silica coating over time, the microamp signal falls. The hallmark symptom is a furnace that ignites for 3–7 seconds and then shuts off, cycling two or three times before locking out — no lasting heat, the blower turning on and off, and an ignition-lockout code on the board. Specs: this is a stainless-steel/Kanthal sensing rod with a ceramic insulator. A healthy sensor produces a flame current in roughly the 1–6 microamp range (read in series with a meter set to DC microamps); once it falls below about 0.5–1 µA the board drops out. OEM rod alloy and geometry are matched to sit at the correct depth and angle in this burner assembly. OEM matters because aftermarket rods often use thinner or different alloy and imprecise placement, so they read a weaker, less stable flame current, coat faster, and trigger the very nuisance lockouts you're trying to eliminate. A correct OEM sensor restores a strong, steady signal and dependable ignition. Install difficulty: 2 of 5. Tools: 1/4" nut driver, optionally a multimeter (DC microamps) to verify flame current, and fine emery cloth if you choose to clean instead of replace. #1 safety warning: shut off both the gas supply and the furnace power before removing the sensor, and never bend the rod toward the burner. 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 PG9MAA036040AAKA. 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.