OEM Carrier Flame Sensor for PG8UAA042091AAJA Gas Package Unit

The flame sensor is the safety device that proves your Carrier package unit's burners actually lit. Once the hot surface igniter glows and the gas valve opens, this thin metal rod sits in the burner flame and generates a tiny electrical current through flame rectification, telling the control board it is safe to keep gas flowing. When the rod becomes coated in oxide or carbon, that signal drops and the board can no longer see the flame. The classic symptom is short-cycling: the furnace ignites, runs for three to seven seconds, then shuts the gas off and tries again, leaving you with little or no heat and a blower pushing cool air. This is a single-rod flame rectification sensor with a stainless-steel sensing tip and a high-temperature ceramic insulator. A healthy sensor produces roughly 1 to 6 microamps of DC current; most Carrier boards require at least 0.5 to 1 microamp to hold the valve open. The mounting bracket and 1/4-inch quick-connect terminal match the original for a direct fit. Why OEM matters here: genuine sensors use corrosion-resistant alloys that hold a strong, stable microamp signal across thousands of cycles. Cheap aftermarket rods oxidize quickly and use thinner, lower-grade metal, producing a weak signal, nuisance lockouts, and repeat service calls within a season. Installation difficulty: 2 of 5. You will need a 1/4-inch nut driver, fine steel wool or emery cloth, and ideally a multimeter set to DC microamps to confirm the new signal. Safety first: shut off the gas supply and kill power at the breaker before removing the old 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 PG8UAA042091AAJA. 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.