OEM Carrier Flame Sensor (48GS400192) for Model PY3PNA030040AB

This is the genuine OEM Carrier flame sensor (part #48GS400192) — the factory-specified replacement for the Carrier PY3PNA030040AB gas furnace. The flame sensor is a critical safety component: once the burner ignites, the sensor uses ionization/rectification technology to detect the presence of a live flame and send a confirmation signal back to the control board. If the sensor is coated with oxidation or has failed entirely, the control board will cut gas flow within 5–8 seconds of ignition, causing the furnace to lock out and cycle repeatedly without producing heat.

• Specs: 90° mounting angle | Includes integrated mounting bracket | OEM part #48GS400192 | Dimensions approx. 4.9" L × 1.75" H × 1.6" W | Factory-matched signal tolerance
• OEM vs Generic: This is a genuine Carrier OEM sensor built to exact factory specifications. Generic aftermarket sensors can produce inconsistent microamp readings, causing nuisance lockouts or — worse — false flame confirmation. OEM is the only safe choice for a gas combustion safety device.
• Install difficulty: 2/5 — Turn off gas and power before servicing. Locate the sensor rod in the burner assembly, disconnect the single wire connector, remove the mounting screw, and reverse to install. Tools needed: 1/4" or 5/16" nut driver, soft cloth or fine steel wool to clean rod tip if reusing. Total time: under 15 minutes.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY3PNA030040AB gas furnace. Always confirm the OEM part number on your existing sensor or equipment data plate before ordering. Our fitment team is available to verify compatibility before you buy — same-day shipping on all in-stock orders.