OEM Carrier Flame Sensor for PG9MAA024040ACKA 80% Gas Furnace

The flame sensor confirms that your Carrier PG9MAA024040ACKA furnace actually lit after the gas valve opened. It uses flame rectification — a tiny microamp current passes through the live flame to ground, telling the control board it is safe to keep gas flowing. When the sensor is coated in oxide or fails, the board can no longer 'see' the flame, so it shuts the gas valve within seconds as a safety measure. The classic symptom is short-cycling: the burners light, run for 3-7 seconds, then snuff out, and the furnace repeats this several times before locking out. You feel a brief puff of warm air, then nothing but the inducer running. The sensor is a single silicon/Kanthal rod in a ceramic insulator. A clean sensor in a strong flame should read roughly 2-6 microamps DC; below about 0.5-1.0 microamps the board drops the call for heat. A cracked ceramic insulator causes erratic readings and intermittent lockouts even after cleaning. OEM matters because rod length and position set the flame-immersion depth. A generic sensor that sits too shallow or uses a thinner rod produces a weak, drifting microamp signal that triggers nuisance lockouts on cold mornings when the furnace cycles most. The OEM rod is dimensioned to sit correctly in this burner assembly. Install difficulty: 1 of 5. Tools: 1/4" nut driver and fine emery cloth or a Scotch-Brite pad (never sandpaper grit on the rod). SAFETY: turn off the furnace gas shutoff and the breaker before removing the sensor, and let the burner area cool. 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 PG9MAA024040ACKA. 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.