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The flame sensor in your Carrier PG92 furnace is a slender metal rod that sits in the burner flame and tells the control board the burners actually lit. It relies on flame rectification: the board sends a small AC signal down the rod, the ionized flame rectifies it into a tiny DC microamp current, and that current is the board's only proof of flame. Lose the signal and the gas valve closes within seconds for safety. As the rod accumulates oxide or soot, the most common complaint appears — the furnace ignites, runs only a few seconds, shuts off, retries a couple of times, then locks out and leaves the house cold. This sensor generates a flame-rectification current typically between 1 and 6 microamps (µA), and most boards need about 0.5–1 µA to hold the gas valve open. The rod is a high-temperature alloy held at a precise depth and angle so its tip stays inside the flame envelope; it should read very high resistance to ground, and a low reading points to a cracked insulator that must be replaced. OEM matters because the rod's alloy and exact geometry are engineered for your burner. Generic rods often use lower-grade metal that oxidizes faster — the signal weakens and short-cycling returns in months — and a rod with the wrong length or bend sits outside the flame, producing chronic weak-signal lockouts. Install difficulty: 1 of 5. Tools needed: 1/4" nut driver, fine steel wool or emery cloth for cleaning, and a multimeter capable of reading microamps. Safety warning: kill the furnace power at the breaker before working near the burners and let the assembly cool — the sensor sits in direct flame. 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.
This part is compatible with Carrier model PG92SBS66100CAAA. Always verify the part number against your unit's data plate before ordering.
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.
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.