OEM Carrier Flame Sensor 48GS400192 for Model PY3GNA024040AB

This is the genuine OEM factory-replacement flame sensor (part number 48GS400192) for the Carrier PY3GNA024040AB gas furnace. The flame sensor is a critical safety component: after ignition, it uses ionization/rectification technology to verify that a burner flame is actively present. If the sensor is fouled, corroded, or failed, the furnace control board will not detect the flame signal and will shut off the gas valve within 5–8 seconds of ignition — resulting in repeated short-cycle lockouts and a cold home. Replacing this sensor is one of the most common and cost-effective furnace repairs available.

• Part Specs: OEM Carrier part #48GS400192 | 90-degree mounting angle | Includes mounting bracket | Approx. dimensions: 4.9" H × 1.75" W × 1.6" rod length | Genuine OEM replacement
• OEM vs Generic: This is a factory-matched OEM part built to exact Carrier specifications. Generic sensors often use lower-grade rod alloys that oxidize faster, shortening service life and causing nuisance lockouts sooner than an OEM unit.
• Install Difficulty: 2/5 — A straightforward repair for DIYers with basic tools. You will need a 1/4" hex driver, needle-nose pliers, and fine steel wool or emery cloth to clean the burner rod port. Always shut off power and gas before servicing. Disconnect the single lead wire, remove the one mounting screw, swap the sensor, and reconnect.
• Warranty & Shipping: Backed by a 1-year OEM manufacturer warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3GNA024040AB gas furnace. Verify your existing part number on the sensor body or your unit's wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists can confirm compatibility before you buy — contact us today and get your heat back fast.