OEM Carrier Flame Sensor 48GS400192 for Model PY3PNA018040AA

This is the genuine OEM Carrier flame sensor (part #48GS400192) factory-specified for the Carrier PY3PNA018040AA gas furnace. The flame sensor — also called a flame rod — uses ionization/rectification technology to confirm that a burner flame is present after ignition. When it detects a valid flame signal, it allows the gas valve to stay open and the heating cycle to continue. When the sensor fails or becomes coated with oxidation residue, the furnace's control board cannot confirm ignition and will shut down the gas valve within 5–8 seconds as a safety measure, causing repeated no-heat lockouts.

• Specs: 90° rod angle | Includes mounting bracket | OEM part #48GS400192 | Approx. dimensions: 4.9" L × 1.75" H | Factory-matched ionization 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 metal alloy specifications, ensuring reliable microamp signal output that your control board expects. Generic sensors may produce inconsistent readings, leading to nuisance shutdowns or premature board failure.
• Install difficulty: 2/5 — Tools needed: 1/4" hex driver or nut driver, needle-nose pliers, multimeter (to verify microamp draw after install). Turn off power and gas before beginning. Photograph existing wire routing before disconnecting. Clean mounting surface before seating the new sensor.
• Warranty: 1-year OEM manufacturer warranty against defects. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PNA018040AA gas furnace. This sensor is the 90-degree mounting-bracket style — confirm your existing sensor angle before ordering. Our fitment team is available to verify compatibility before you buy. Order now and receive same-day shipping on in-stock inventory.