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The flame sensor is a single metal rod that sits directly in the burner flame and confirms ignition by passing a tiny microamp current through the flame back to the control board (a process called flame rectification). When the rod oxidizes, cracks, or carbons over, the board can no longer prove the burners are lit and shuts the gas valve within 2-5 seconds as a hard safety response. Homeowners typically notice the furnace firing briefly, then dropping out, then re-trying — classic short-cycling — until it locks out and the house goes cold. A weak or dirty sensor is the single most common cause of intermittent no-heat calls. This OEM sensor uses a Kanthal/stainless-steel rod rated for sustained burner temperatures, and is calibrated to deliver the 1-6 microamp flame-rectification signal the Carrier board expects. A healthy reading is typically above 1.0 µA; readings under 0.5 µA cause lockouts. The rod length, bend angle, and ceramic insulator are matched to seat correctly in the burner box. Generic rods often use thinner wire and lower-grade insulators that oxidize faster and sit at the wrong depth in the flame, producing a marginal signal that triggers nuisance lockouts within months. The OEM rod holds position and signal strength for years. Install difficulty: 1 of 5. Tools: 1/4" nut driver and a multimeter set to microamps to verify the signal. SAFETY: shut off the gas supply and kill power at the furnace switch 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.
This part is compatible with Carrier model PY1REA072115ACWA. 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.