OEM Carrier Flame Sensor (48GS400192) for Model PY2PEB042090AA

This OEM Carrier flame sensor is the factory-specified replacement for the Carrier PY2PEB042090AA 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 it detects the flame, it sends a microamp signal back to the control board confirming safe combustion. When this sensor fails or becomes coated with oxidation buildup, the control board receives no confirmation signal and shuts the gas valve off as a safety precaution — typically 5 to 8 seconds after ignition. The result: your furnace lights briefly, then shuts off repeatedly, often triggering a fault lockout code.

• Part Number: OEM Carrier 48GS400192 | 90-degree flame rod with factory mounting bracket included
• OEM vs Generic: This is the genuine factory OEM part — not an aftermarket substitute. OEM sensors are calibrated to the exact microamp threshold your Carrier control board expects, ensuring reliable flame detection and reducing nuisance lockouts caused by tolerance drift in off-brand sensors.
• Install Difficulty: 2/5 — Turn off gas and power before servicing. Tools needed: 1/4" nut driver, flat-head screwdriver, and a multimeter (to verify microamp signal if needed). Disconnect the single lead connector, remove the mounting screw, swap the sensor, and reconnect. No soldering required.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY2PEB042090AA gas furnace. Before ordering, confirm that part number 48GS400192 appears on your existing sensor or in your unit's service manual. Our HVAC parts specialists are available to verify fitment — order with confidence and get back to heat fast.