OEM Carrier Flame Sensor (48GS400192) for Model PY3PPA042090AA

This OEM flame sensor is the factory-specified replacement for the Carrier PY3PPA042090AA gas furnace. The flame sensor — also called a flame rod — uses ionic rectification to detect the presence of a burner flame during each heating cycle. When the sensor rod becomes coated with oxidation or carbon buildup, its microamp signal drops below the control board's threshold, causing the furnace to light briefly and then shut down after just 5–8 seconds. Left unaddressed, this triggers a hard lockout and a no-heat call. Replacing the sensor with the correct OEM part restores reliable flame detection and prevents nuisance shutdowns.

• Specs: OEM Part # 48GS400192 | 90° angle mounting bracket | Flame rod with insulated lead wire | Factory-matched microamp output | Dimensions approx. 4.9" L × 1.75" H × 1.6" W
• OEM vs Generic: OEM sensors are built to Carrier's exact rod alloy and insulation spec, ensuring consistent microamp output across temperature cycles. Generic sensors may produce marginal signals that cause intermittent lockouts — especially as they age.
• Install Difficulty: 2/5 — Straightforward single-screw mount with a push-on wire connector. Tools needed: 1/4" nut driver or flathead screwdriver, fine steel wool or emery cloth (for rod cleaning if reusing), and a multimeter to verify microamp draw after installation. Always shut off power and gas before servicing.
• Warranty: Backed by a 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY3PPA042090AA gas furnace. Always verify the OEM part number on your existing sensor or unit data plate before ordering to confirm fitment. Our parts specialists are standing by to verify compatibility — no guesswork required. Order today and receive same-day shipping on all in-stock parts.