OEM Carrier Flame Sensor 48GS400192 for Model PY2PNB030040AA

This is the factory OEM replacement flame sensor (part number 48GS400192) for the Carrier PY2PNB030040AA packaged unit. The flame sensor — also called a flame rod — is a safety component mounted in the burner assembly that detects the presence of a sustained flame during the ignition sequence. It passes a small DC microamp current through the burner flame to signal the control board that combustion is confirmed. When the sensor becomes coated with oxidation or carbon buildup, or fails entirely, the control board cannot verify a flame and will shut off the gas valve within 5–8 seconds of ignition — causing the frustrating "starts then locks out" symptom most technicians recognize immediately.

• Specs: OEM part number 48GS400192 | Factory-matched rod length and mounting bracket geometry | Compatible microamp signal range per factory control board specification | Stainless steel sensing rod
• OEM vs Generic: This is a genuine OEM Carrier part. OEM flame sensors ensure the correct rod length, bend angle, and signal output. Generic sensors with incorrect geometry can result in intermittent nuisance lockouts or flame-proving failures even when a good flame is present.
• Install Difficulty: 2/5 — A straightforward single-screw replacement. Shut off gas and power before servicing. Tools needed: 1/4" hex driver or nut driver, lightly abrasive pad (to clean rod if reusing), and a multimeter for microamp verification. Always confirm gas is off before accessing the burner compartment.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: This part is factory-specified for the Carrier PY2PNB030040AA packaged unit. Always cross-reference the OEM part number 48GS400192 on your existing sensor or equipment data plate before ordering to confirm fitment. Need help verifying compatibility? Our HVAC parts specialists are available to confirm the correct part before you order — so you get it right the first time.