OEM Carrier 90° Flame Sensor with Mounting Bracket for Model PY3GNA042090NB

This is the genuine OEM Carrier flame sensor (part #48GS400192) factory-specified for the Carrier PY3GNA042090NB gas furnace. The flame sensor — also called a flame rod — is a critical safety component that uses ionization/rectification technology to confirm that a burner flame is present after ignition. If the control board doesn't detect a valid flame signal within a few seconds of the gas valve opening, it cuts gas flow and locks out the furnace. A failed or dirty flame sensor is one of the most common causes of a furnace that starts, runs briefly, then shuts off after 5–8 seconds — often triggering a repeated ignition lockout.

• Specs: 90° angled rod configuration | Includes factory mounting bracket | Approx. dimensions: 4.9" H × 1.75" W × 1.6" rod length | OEM part #48GS400192
• OEM vs Generic: This is a genuine Carrier OEM part — not an aftermarket substitute. OEM flame sensors maintain exact rod geometry and metallurgy, ensuring consistent microamp output and reliable flame signal. Aftermarket rods can produce weak or erratic readings, causing nuisance lockouts even on a good burner.
• Install difficulty: 2/5 — Turn off power and gas before servicing. Locate the sensor on the burner assembly, disconnect the single wire connector, remove the mounting screw, and swap in the new sensor. Tools needed: 1/4" nut driver or flat-head screwdriver. Tip: lightly sand the rod with fine steel wool if replacing due to coating buildup, and verify microamp signal (≥1.0 µA) with a multimeter after install.
• Warranty: 1-year OEM factory warranty against manufacturing defects. Ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3GNA042090NB gas furnace. Verify part number 48GS400192 against your unit's data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility — just reach out before you buy. In stock and ready to ship today.