OEM Carrier Flame Sensor (48GS400192) for Model PY3PEA042090NB

This OEM 90-degree flame sensor with mounting bracket is the factory-specified replacement for the Carrier PY3PEA042090NB gas furnace. The flame sensor is a critical safety component: once the igniter lights the burners, the sensor's rod is engulfed in flame and passes a small rectified current back to the control board to confirm combustion. If the board doesn't receive that signal — due to a failed, cracked, or carbon-fouled sensor rod — it will cut the gas valve within 5 to 8 seconds as a safety lockout. The result is a furnace that lights briefly, then shuts down and goes into repeated retry cycles before locking out entirely.

• OEM Part Number: 48GS400192 | 90-degree rod orientation with integrated mounting bracket | Compact form factor (approx. 4.9" L × 1.75" H)
• OEM vs Generic: This is the genuine Carrier OEM sensor, manufactured to exact factory resistance and geometry specifications. Aftermarket sensors can have slightly different rod lengths or angles, causing marginal or intermittent signal readings that result in nuisance lockouts — especially in cold weather when you need heat most.
• Install Difficulty: 1/5 — One of the easiest furnace repairs. Tools needed: 1/4" hex nut driver, fine steel wool or emery cloth (to clean rod if reusing). Turn off power and gas before starting. Remove one screw, disconnect the wire harness, swap the sensor, reconnect, and restore power.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Direct OEM replacement for Carrier PY3PEA042090NB gas furnaces. Always cross-reference your unit's data plate and wiring diagram to confirm part number 48GS400192 before ordering. Our fitment team is available to verify compatibility — just reach out before you buy. Order now and your part ships today.