OEM Carrier Flame Sensor (48GS400192) for Model PY2PPB042090NB

This is the genuine OEM Carrier flame sensor, part number 48GS400192, factory-specified for the Carrier PY2PPB042090NB gas furnace. The flame sensor is a critical safety component that detects the presence of a burner flame using ionization/rectification technology — allowing the control board to confirm ignition before allowing continued gas flow. When this sensor fails or becomes coated with oxidation, the furnace will light briefly and then shut itself off within 5 to 8 seconds, triggering a safety lockout. Repeated short-cycling with no heat is the classic symptom of a failing or dirty flame sensor.

• Specs: 90-degree flame rod with mounting bracket | Approx. rod length 1.6" | Overall dimensions approx. 4.9" × 1.75" | Factory OEM tolerances for accurate microamp signal detection
• OEM vs Generic: This OEM sensor is manufactured to Carrier's exact signal-sensitivity specs. Aftermarket sensors can produce inconsistent microamp readings, causing nuisance lockouts or, worse, failing to shut off gas on an actual flame-out event.
• Install Difficulty: 2/5 — Turn off gas supply and 24V power before servicing. Tools needed: 1/4" hex driver, needle-nose pliers, multimeter (microamp mode to verify signal). Always clean the burner bracket mount and verify no carbon tracking on the porcelain insulator before installing the new sensor.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse — order before 3 PM local time.

Compatibility: Designed and verified for the Carrier PY2PPB042090NB gas furnace. Always cross-reference your unit's data plate and the existing part number before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you buy — reach out before you order and we'll confirm the right part for your system.