OEM Carrier Flame Sensor (48GS400192) for Model PY2PNB024040NB

This is the genuine OEM replacement flame sensor for the Carrier PY2PNB024040NB gas furnace. The flame sensor — also called a flame rod — is a critical safety component mounted in the burner assembly. Using ionization/rectification technology, it detects a small microamp DC current produced when the burner flame contacts the rod. If the signal falls below threshold, the control board cuts gas flow within 5–8 seconds to prevent unburned gas accumulation. A failed or contaminated flame sensor is one of the most common causes of a furnace that lights, runs briefly, and then locks out — often generating a fault code on the control board.

• Part Number & Specs: OEM Part #48GS400192 | 90-degree rod orientation with integrated mounting bracket | Approximate dimensions: 4.9" H × 1.75" W × 1.6" rod length | Factory-matched signal tolerance for the PY2PNB024040NB control board
• OEM vs. Generic: OEM sensors are manufactured to exact rod alloy and geometry specifications. Off-brand sensors can produce weak or inconsistent microamp readings, causing nuisance lockouts — especially in colder weather when the control board demands a faster, cleaner flame signal.
• Install Difficulty: 1/5 — One of the easiest furnace repairs. Tools needed: 1/4" hex driver or nut driver, fine steel wool or light sandpaper (to clean rod if reusing), and a multimeter to verify microamp draw post-install. Turn off gas and 24V power before disconnecting the sensor lead.
• Warranty & Shipping: Backed by a 1-year OEM manufacturer warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier model PY2PNB024040NB. Always verify your existing part number on the sensor body or equipment data plate before ordering. Need fitment confirmation? Our HVAC parts team is standing by — order with confidence and get your heat back on today.