OEM Carrier Flame Sensor 48GS400192 for Model PY2PNB024040AA

This OEM flame sensor (part #48GS400192) is the factory-specified replacement for the Carrier PY2PNB024040AA gas furnace. The flame sensor is a critical safety component — it uses ionization/rectification technology to detect the presence of a burner flame during each heating cycle. When the burner ignites, the flame produces a small electrical signal that the sensor reads and confirms to the control board. If the board does not receive that signal within a few seconds, it cuts the gas supply and locks out the furnace. A failed or carbon-coated flame sensor is one of the most common reasons a furnace lights briefly and then shuts off after just 5–8 seconds, triggering a fault lockout code.

• Specs: 90° angled flame rod with integrated mounting bracket | Approx. dimensions: 4.9"(H) × 1.75"(W) × 1.6"(L) rod | OEM part #48GS400192 | Factory-matched signal sensitivity
• OEM vs Generic: This is a genuine Carrier OEM part built to exact factory tolerances. Generic sensors may have mismatched rod angles, incorrect wire lead lengths, or inconsistent ionization sensitivity — all of which can cause nuisance lockouts or missed fault detection.
• Install difficulty: 2/5 — Turn off power and gas before servicing. Tools needed: 1/4" hex driver or nut driver, flat-head screwdriver, fine steel wool or emery cloth (to clean rod if reusing). Disconnect the single wire lead, remove the mounting screw, swap the sensor, and reconnect. Always verify operation through a full heating cycle before closing the unit.
• Warranty: 1-year OEM manufacturer warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY2PNB024040AA gas furnace. If your furnace repeatedly starts and shuts down within seconds, or displays a flame-sensing fault code, this is the first part to inspect and replace. Verify your model and part number on the unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence and get back to heat fast.