OEM Carrier Flame Sensor (48GS400192) for Model PY2PEB042090NB

This is the factory OEM replacement flame sensor for the Carrier PY2PEB042090NB gas furnace. The flame sensor — also called a flame rod — is a critical safety component mounted in the burner assembly. Using ionization/rectification technology, it passes a small electrical current through the burner flame to verify ignition. If the furnace lights, runs for 5–8 seconds, then shuts down and locks out, a failed or contaminated flame sensor is the most common cause. The control board stops gas flow when it stops receiving the flame-confirmation signal, triggering a safety lockout to prevent unburned gas from accumulating.

• Part Number: OEM Carrier 48GS400192 | 90-degree flame rod with factory mounting bracket included
• OEM vs Generic: This is a genuine Carrier OEM part, manufactured to exact factory tolerances. Generic aftermarket sensors can have incorrect rod angle, improper connector fit, or out-of-spec microamp output — all of which cause nuisance lockouts or unsafe operation. OEM is always the correct choice for flame sensing circuits.
• Install Difficulty: 2/5 — Always shut off gas supply and 120V power before beginning. Tools needed: 1/4" nut driver, flat-head screwdriver, and a multimeter (to verify microamp signal post-install). Lightly sand the rod with fine steel wool if reusing — or simply swap for this new unit. Typical repair time: 20–30 minutes.
• Warranty: 1-year OEM manufacturer warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY2PEB042090NB gas furnace. Always confirm your unit's full model and serial number against your existing part before ordering. Our fitment team is available to verify compatibility before you buy — reach out before placing your order if you have any questions.