OEM Carrier Flame Sensor (48GS400192) for Model PY3PNA042090NA

This is the genuine OEM Carrier flame sensor, part number 48GS400192, factory-specified for the Carrier PY3PNA042090NA gas furnace. The flame sensor is a critical safety component: after the igniter lights the burner, the sensor's rod detects the flame via electrical rectification and sends a confirming signal to the control board. If the board doesn't receive that signal within a few seconds, it shuts down the gas valve as a safety precaution. A failed or contaminated flame sensor is one of the most common causes of a furnace that starts, runs for 5–8 seconds, then locks out — repeating this cycle until it faults.

• Specs: 90-degree mounting angle | Flame rod with integrated mounting bracket | OEM dimensions ~4.9" L × 1.75" H | Direct factory-matched replacement for part # 48GS400192
• OEM vs Generic: This is a genuine Carrier OEM part, built to exact factory tolerances. Generic sensors may have inconsistent rod coatings or bracket angles that cause intermittent detection errors, leading to nuisance lockouts even after installation.
• Install difficulty: 2/5 — Turn off gas and power before beginning. Tools needed: 1/4" hex driver, needle-nose pliers, and 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. Tip: lightly sand the rod with steel wool if the burner lights but the sensor still faults before replacing.
• Warranty: Backed by a 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PNA042090NA gas furnace. Always verify your existing part number on the sensor body or your unit's wiring diagram before ordering. Our team is available to confirm fitment — reach out before you buy. Order today and your part ships the same business day.