OEM Carrier Flame Sensor (48GS400192) for Model PY2PPB042090AA

This is the OEM factory-specified flame sensor for the Carrier PY2PPB042090AA gas furnace. The flame sensor — also called a flame rod — is a critical safety component that uses ionization/rectification technology to verify that a burner flame is present after ignition. When the burner fires, the flame generates a small DC microamp signal through the rod; the control board reads this signal to confirm safe combustion. If the sensor is coated with oxidation or has failed entirely, the board cannot confirm flame presence and will shut off the gas valve within 5–8 seconds as a safety lockout — leaving you with a furnace that lights briefly then goes cold. Replacing this sensor with the correct OEM part restores reliable flame verification and eliminates nuisance lockouts.

• Specs: 90° flame rod configuration | Includes mounting bracket | Approx. dimensions 4.9" × 1.75" × 1.6" | OEM Part # 48GS400192 | Carrier factory-matched signal tolerance
• OEM vs Generic: OEM sensors are precision-matched to the control board's microamp detection range. Generic aftermarket rods can fall outside tolerance, causing intermittent lockouts or nuisance shutdowns even when the flame is healthy.
• Install difficulty: 2/5 — Turn off power and gas before servicing. Tools needed: 1/4" hex driver, needle-nose pliers, fine steel wool or emery cloth (to clean rod if reusing). Photograph the harness connector orientation before disconnecting. Average replacement time: 15–20 minutes.
• Warranty: 1-year OEM manufacturer warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY2PPB042090AA packaged gas furnace. Always verify your unit's OEM part number on the data plate or wiring diagram before ordering. Have fitment questions? Our HVAC parts team confirms compatibility before you buy — ships today when ordered before 3PM.