OEM Carrier Flame Sensor (48GS400192) for Model PY3PPA042090NB

This is the genuine OEM factory-replacement flame sensor for the Carrier PY3PPA042090NB gas furnace. The flame sensor — also called a flame rod — uses ionization/rectification to detect whether a burner flame is actually present after ignition. When it detects a valid flame, it sends a microamp signal to the control board to keep the gas valve open. A failed or coated sensor sends a weak or absent signal, causing the furnace to light briefly and then shut off within 5–8 seconds, repeating in lockout cycles until the fault is resolved.

• Part Number: 48GS400192 | 90-degree mounting bracket | Compatible with Carrier gas furnaces including the PY3PPA042090NB series
• OEM vs Generic: This is a genuine Carrier OEM part — factory-matched geometry, rod metallurgy, and bracket angle. Aftermarket sensors can have incorrect rod length or angle, causing persistent nuisance trips or premature failure.
• Install Difficulty: 2/5 — Turn off power and gas before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a multimeter (to verify microamp draw post-install). Disconnect the single lead wire, remove the one mounting screw, swap the sensor, and reconnect. Typical repair time: 15–20 minutes.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered for the Carrier PY3PPA042090NB gas furnace. Always verify your unit's data plate and existing sensor geometry (rod length, bracket angle) before ordering. Our fitment team is available to confirm compatibility — just reach out before you buy. Order now and your part ships today.