OEM Carrier Flame Sensor (48GS400192) for Model PY1PPB048115NBAA

This is the factory OEM replacement flame sensor for the Carrier PY1PPB048115NBAA gas furnace. The flame sensor — also called a flame rod — is a critical safety component that uses ionization/rectification technology to detect the presence of a burner flame during each heating cycle. When the control board initiates ignition, the sensor generates a small DC microamp signal confirming combustion. If that signal is absent or too weak (typically due to carbon buildup or a failed rod), the board shuts off the gas valve within 5–8 seconds as a safety measure, causing a no-heat lockout condition. Replacing this part with the correct OEM unit restores proper flame detection and eliminates nuisance lockouts.

• Part Number: 48GS400192 | 90-degree flame sensor with mounting bracket | Carrier OEM factory specification
• OEM vs Generic: OEM sensors are calibrated to the exact microamp threshold required by the Carrier control board on the PY1PPB048115NBAA. Off-brand sensors may carry wider tolerances, leading to intermittent lockouts 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 signal post-install). Disconnect the single wire connector, remove the mounting screw, swap the sensor, and confirm signal strength at the control board.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PY1PPB048115NBAA packaged gas furnace unit. Always verify the part number on your existing sensor or the unit's wiring diagram before ordering. Have a fitment question? Our HVAC parts specialists confirm compatibility before you buy — order with confidence and get back to heat fast.