OEM Carrier Flame Sensor 48GS400192 for Model PY3GNA048130AB

This is the OEM factory-specified flame sensor (part number 48GS400192) for the Carrier PY3GNA048130AB packaged unit. The flame sensor — also called a flame rod — is a critical safety component in the ignition sequence. It detects the presence of a burner flame by passing a small microamp current through the flame to ground. When the sensor becomes contaminated with oxidation or carbon buildup, the microamp signal drops below the control board's threshold, causing the system to shut off the gas valve within 5–8 seconds of ignition — a symptom commonly described as the furnace or heating system "lighting then going out." Left unaddressed, this fault will trigger a hard lockout, requiring a manual reset.

• OEM Part Number: 48GS400192 | Genuine Carrier replacement | Factory-matched microamp sensing specification for reliable flame detection
• OEM vs Generic: This OEM sensor is manufactured to Carrier's exact rod length, bracket geometry, and ceramic insulator rating. Aftermarket alternatives may have sensing tolerances that cause nuisance lockouts or, worse, delayed shutoff — making OEM the only recommended choice for this safety-critical component.
• Install Difficulty: 2/5 — Turn off gas and 24V power before servicing. Tools needed: 1/4" hex driver or nut driver, fine steel wool or emery cloth (for light cleaning if reusing), multimeter (microamp-capable). Always verify microamp reading post-installation: a healthy sensor reads 2–6 µA DC.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Engineered for the Carrier PY3GNA048130AB packaged unit. Always cross-reference your unit's data plate and existing part number before ordering to confirm fitment. Need help verifying compatibility? Our HVAC parts specialists confirm fitment before you buy — contact us before placing your order.