OEM Carrier Flame Sensor (48GS400192) for Model PY1PNB042090AAAA

This is the factory OEM replacement flame sensor for the Carrier PY1PNB042090AAAA 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 the sensor is coated with oxidation or has failed entirely, the furnace control board cannot confirm ignition and will shut down the gas valve, causing the unit to lock out after just 5–8 seconds of operation. Replacing this low-cost part is one of the most common furnace repairs and restores normal heating operation immediately.

• OEM Part Number: 48GS400192 | Type: 90-Degree Flame Sensor with Mounting Bracket | Dimensions: approx. 4.9″ L × 1.75″ H × 1.6″ W | Factory-spec rod material and connector
• OEM vs Generic: This is a genuine Carrier OEM part — same exact sensor installed at the factory. OEM sensors maintain precise ionization thresholds required by your control board. Off-brand sensors can produce inconsistent microamp readings, causing nuisance lockouts or false flame signals.
• Install Difficulty: 2/5 — A straightforward single-screw replacement accessible from the burner compartment. Tools needed: 1/4″ nut driver or flat-head screwdriver, fine steel wool or emery cloth (to clean rod if reusing), and a multimeter (optional, to verify microamp output). Always shut off power and gas before servicing. Photograph the wire connection before disconnecting.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY1PNB042090AAAA gas furnace. Always cross-reference the OEM part number on your existing sensor or your unit's wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists verify compatibility before your order ships — contact us today. Order now and get same-day shipping!