OEM Carrier 90° Flame Sensor with Mounting Bracket for Model PY2PPB030040AB — Part# 48GS400192

This is the factory OEM replacement flame sensor for the Carrier PY2PPB030040AB gas furnace. The flame sensor is a critical safety component — a small but vital rod that uses ionization/rectification to confirm a live burner flame during each heating cycle. When it detects a flame, it allows the gas valve to stay open. When it fails or becomes coated with oxidation, the furnace will light briefly, then shut down within 5–8 seconds as the control board interprets no flame signal and initiates a safety lockout. Repeated short-cycling, error codes, or a furnace that never reaches setpoint temperature are all telltale signs of a failed or fouled flame sensor.

• Part Specs: 90° angled flame rod with integrated mounting bracket | OEM part number 48GS400192 | Approx. dimensions: 4.9"(H) × 1.75"(W) × 1.6"(L) rod | Direct factory-matched fit for Carrier PY2PPB030040AB
• OEM vs Generic: This is a genuine Carrier OEM part built to exact factory metallurgy and geometry specifications. Generic sensors may have slightly different rod angles or coatings, leading to nuisance lockouts and premature failure — especially in high-cycle residential applications.
• Install Difficulty: 2/5 — A straightforward single-screw swap accessible from the burner compartment. Tools needed: 1/4" nut driver or hex screwdriver, fine steel wool or emery cloth (to clean rod if reusing), multimeter (optional, for microamp verification). Always shut off gas and power before servicing. Photograph the wiring connector orientation before disconnecting.
• Warranty: 1-year OEM factory warranty against manufacturing defects. Ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier model PY2PPB030040AB gas furnaces. Always verify your unit's model and data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists can confirm fitment before you buy — order now and your part ships today.