OEM Carrier Flame Sensor 48GS400192 for Model PY2PNB042090AB

This is the genuine OEM Carrier flame sensor (part number 48GS400192), factory-specified for the Carrier PY2PNB042090AB gas furnace. The flame sensor is a critical safety component that uses ionization/rectification to detect the presence of a burner flame during each heating cycle. When the burner ignites, the flame produces a small DC microamp signal across the sensor rod — if that signal is absent or too weak (due to a contaminated or failed rod), the integrated furnace control board will shut off the gas valve within 5–8 seconds as a safety precaution. The result: a furnace that lights briefly, then goes out repeatedly, locking out after 3 attempts.

• Part Specs: 90-degree bend configuration | Includes mounting bracket | OEM dimensions approx. 4.9" L × 1.75" H | Direct factory replacement for Carrier PY2PNB042090AB
• OEM vs Generic: This is a genuine Carrier OEM part — not an aftermarket substitute. OEM sensors are manufactured to exact rod alloy and geometry specs, ensuring proper microamp signal and reliable flame detection. Generic alternatives may produce inconsistent readings, leading to nuisance lockouts.
• Install Difficulty: 2/5 — Shut off gas and power before servicing. Locate the sensor rod in the burner assembly, disconnect the single-wire connector, remove the mounting screw, and swap in the new sensor. Tools needed: 1/4" nut driver, light-grit emery cloth (to clean rod contact area if reusing). Total time: 10–20 minutes.
• Warranty: Backed by a 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse — order before 3 PM local time.

Compatibility: Designed specifically for the Carrier PY2PNB042090AB gas furnace. Always verify your model and serial number on the furnace data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you buy — reach out via chat or phone and we'll confirm in minutes.