OEM Carrier Flame Sensor (48GS400192) for Model PY2PNB030040AB

This is the OEM factory-specified flame sensor for the Carrier PY2PNB030040AB gas furnace. The flame sensor — also called a flame rod — uses ionization/rectification technology to detect the presence of a burner flame during each heating cycle. When the burner ignites, the flame generates a small DC microamp signal that the control board reads as confirmation of combustion. A failed or contaminated sensor causes the board to cut gas flow as a safety measure, resulting in the furnace starting briefly then shutting off within 5–8 seconds, often triggering a lockout fault code.

• OEM Part Number: 48GS400192 | 90-degree flame rod with integrated mounting bracket | Compact rod design (~4.9" L × 1.75" H)
• OEM vs Generic: This is a genuine Carrier OEM part — factory-matched rod alloy, bracket geometry, and connector type. Aftermarket sensors frequently use inferior rod coatings that degrade faster, causing repeat failures and nuisance lockouts.
• Install Difficulty: 2/5 — Power down the furnace at the breaker before servicing. Tools needed: 1/4" hex driver or nut driver, light-grit emery cloth (to clean rod if reusing), and a multimeter to verify microamp signal post-install. Disconnect the wire lead, remove the single mounting screw, swap the sensor, and reconnect. Total time: under 15 minutes for most technicians.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our stocked warehouse.

Compatibility: Designed for the Carrier PY2PNB030040AB gas furnace. Always verify your existing sensor's mounting angle (90°) and connector type against your unit's data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists are available to confirm fitment before you buy — order with confidence and get it shipped today.