OEM Carrier Flame Sensor (48GS400192) for Model PY3PNA048090AA

This is the factory OEM flame sensor (part number 48GS400192) for the Carrier PY3PNA048090AA packaged gas/electric unit. The flame sensor — also called a flame rod — is a safety component mounted in the burner assembly. It detects the presence of a live flame by passing a small microamp current through the flame to ground. When it fails, is coated with oxidation, or reads out of spec, the furnace or heating section will light briefly and then shut off within 5 to 8 seconds, triggering a safety lockout. Replacing the flame sensor with a genuine OEM part restores accurate flame detection and prevents nuisance lockouts.

• Part Number: 48GS400192 | OEM-direct replacement | Factory-matched microamp sensitivity and rod geometry
• OEM vs Generic: OEM flame sensors are manufactured to exact factory current-draw tolerances. Aftermarket sensors often have inconsistent coatings and rod lengths that cause erratic readings, repeated lockouts, or premature failure.
• Install Difficulty: 2/5 — Shut off gas supply and 24V control power before servicing. Tools needed: 1/4" hex driver or nut driver, fine steel wool or emery cloth (to clean mounting bracket), multimeter with microamp setting to verify 1–10 µA flame signal after installation.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier PY3PNA048090AA packaged unit. Before ordering, verify the part number on your existing sensor or the unit's parts breakdown. The PY3PNA048090AA is a 4-ton, 90,000 BTU packaged gas/electric system. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — reach out via chat or phone.