OEM Carrier Flame Sensor (48GS400192) for Model PY3GNA048115AB Gas Furnace

This OEM Carrier flame sensor is the factory-specified replacement for the Carrier PY3GNA048115AB gas furnace. The flame sensor — also called a flame rod — is a critical safety component that detects the presence of a burner flame using an ionization/rectification current. When it functions correctly, it signals the control board that combustion is active and allows the gas valve to stay open. When the sensor is coated with oxidation or carbon deposits, the signal weakens and the control board interprets it as a flame failure — cutting off gas flow and triggering a safety lockout, typically 5–8 seconds after ignition. The result is a furnace that lights briefly, then shuts off and repeats the cycle until it locks out entirely.

• Specs: 90-degree mounting angle | Rod-style flame sensor with bracket | OEM part number 48GS400192 | Dimensions approx. 4.9" L × 1.75" H × 1.6" W | Factory-matched electrical signal tolerance
• OEM vs Generic: This is a genuine Carrier OEM part — not an aftermarket substitute. OEM sensors are manufactured to exact rod geometry and insulator specifications, ensuring proper microamp signal output. Generic sensors may produce marginal readings that cause nuisance lockouts, especially as they age.
• Install difficulty: 2/5 — Power down and lock out the furnace before servicing. Tools needed: 1/4" nut driver or 5/16" socket, needle-nose pliers, fine steel wool or emery cloth (to clean rod on reinstall), and a multimeter to confirm microamp signal if desired. Disconnect the single wire connector, remove the one mounting screw, swap the sensor, and reinstall. Total time: under 15 minutes for most technicians.
• Warranty: 1-year OEM factory warranty against manufacturing defects. Orders ship same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier PY3GNA048115AB gas furnace. If you're unsure of fitment, verify part number 48GS400192 against your unit's service label or existing sensor before ordering. Our team is available to confirm compatibility — order with confidence, and we'll ship it out today.