OEM Carrier 90° Flame Sensor (48GS400192) for Model PY2PPB042090AB

This is the factory OEM flame sensor for the Carrier PY2PPB042090AB gas furnace. The flame sensor — also called a flame rod — is a critical safety component that uses ionization/rectification to detect the presence of a burner flame during each heating cycle. When working correctly, it sends a microamp DC signal to the control board confirming combustion. When it fails or becomes coated with oxidation, the control board cannot verify flame presence and shuts down the gas valve, causing the furnace to lock out after just 5–8 seconds of operation. This is one of the most common furnace service calls in the field.

• OEM Part Number: 48GS400192 | 90-degree bend configuration with integrated mounting bracket | Compact form factor (approx. 4.9" L × 1.75" H)
• OEM vs Generic: This factory-spec OEM sensor is calibrated to the exact microamp threshold required by the Carrier PY2PPB042090AB control board. Aftermarket sensors may read inconsistently, triggering nuisance lockouts or — worse — delayed shutdowns.
• Install Difficulty: 2/5 — Straightforward single-screw removal and reinstall. Tools needed: 1/4" hex driver, fine steel wool or light sandpaper (to clean rod if reusing), multimeter (to verify microamp signal post-install). Always shut off power and gas before servicing.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY2PPB042090AB gas furnace. Verify OEM part number 48GS400192 on your existing sensor or equipment data plate before ordering. Our fitment team is available to confirm compatibility before you buy — in stock and ready to ship today.