OEM Carrier Flame Sensor 48GS400192 for Model PY3PNA018040NA

This is the OEM factory-specified flame sensor (part number 48GS400192) for the Carrier PY3PNA018040NA packaged unit. The flame sensor — also called a flame rod — is a safety component that detects the presence of a burner flame by measuring microamp current through the rod. When the sensor becomes coated with oxidation or carbon buildup, it can no longer reliably detect the flame, causing the control board to cut gas flow as a safety precaution. The result is a frustrating cycle: the furnace ignites normally, runs for 5–8 seconds, then shuts down and locks out. Replacing the flame sensor with a genuine OEM part restores proper operation and eliminates nuisance lockouts.

• Specs: OEM part number 48GS400192 | Factory-matched rod geometry and ceramic insulator | Correct microamp output range for Carrier control board compatibility
• OEM vs Generic: OEM flame sensors use the exact rod alloy and ceramic insulation specified by Carrier's engineering team. Generic alternatives may have slightly different rod lengths or tip geometry, which can produce inconsistent microamp readings and recurring lockouts — even after cleaning.
• Install Difficulty: 2/5 — Always shut off gas supply and 120V power before beginning. Tools needed: 1/4" hex driver or nut driver, needle-nose pliers. Photograph wiring harness connector orientation before disconnecting. Lightly sand the rod with fine steel wool only if reusing; when replacing, install new sensor clean and dry.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed as a direct OEM replacement for the Carrier PY3PNA018040NA packaged unit. Always verify the OEM part number on your existing sensor or equipment data plate before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — contact us before placing your order.