OEM Carrier Flame Sensor Replacement for Furnace PG8UAA048135ABJA

The flame sensor is the safety component that proves your Carrier PG8UAA048135ABJA furnace has truly ignited. Positioned in the burner flame, it relies on flame rectification to send a minute DC current back to the control board, verifying that fire is present so the gas valve is allowed to stay open. Over time the rod gets coated with silica and oxide, or the element fatigues, and the board loses its flame signal — shutting the gas off within just 2-4 seconds. The hallmark symptom is a furnace that lights, runs for a moment, then cuts out and blows cold air, short-cycling over and over until it locks out after three failed tries. You'll often hear the burners ignite only to extinguish seconds later. Specs: This is a single-rod rectification sensor. A properly functioning system reads a steady flame current of about 1-6 microamps DC; readings under roughly 0.5-1 µA trip a flame-loss lockout. The rod's alloy, length, and depth of immersion in the flame determine signal stability — verify it with a multimeter set to microamps wired in series with the sensor lead. OEM matters because geometry is critical. A generic rod with an incorrect length, bend, or alloy sits too shallow or too deep in the flame and produces a weak, erratic microamp signal — causing intermittent nuisance lockouts that are extremely hard to chase down. The genuine Carrier sensor seats at the correct flame immersion every time. Install difficulty: 2 of 5. Tools: 1/4" and 5/16" nut drivers, a Phillips screwdriver, and a multimeter for checking flame current. #1 safety warning: shut off the gas supply and cut power at the furnace switch or breaker before removing the sensor near the burners. 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 PG8UAA048135ABJA. 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.