OEM Carrier Flame Sensor (48GS400192) for Model PY3PNA042090AB

This is the factory OEM flame sensor for the Carrier PY3PNA042090AB packaged gas/electric unit. The flame sensor — also called a flame rod — is a safety component mounted in the burner assembly that detects the presence of a live flame after ignition. It sends a small microamp signal to the control board confirming combustion is active. When the sensor fails or becomes coated with oxidation, the board cannot confirm flame presence and shuts off the gas valve within 5–8 seconds as a safety lockout — leaving you with a no-heat call that repeats on every cycle.

• Specs: OEM Part Number 48GS400192 | Flame rod / flame sensor type | Factory-matched microamp signal output | Direct drop-in fit for Carrier PY3PNA042090AB gas section
• OEM vs Generic: This is the genuine OEM Carrier part, manufactured to exact factory specification. Generic flame sensors may have incorrect rod length, angle, or coating — leading to nuisance lockouts or premature failure even after installation.
• Install difficulty: 2/5 — Turn off gas and 24V control power before servicing. Tools needed: 1/4" hex driver or nut driver, fine steel wool or emery cloth (to clean rod if reusing), multimeter (to verify microamp draw post-install). Always confirm microamp reading is within the control board's acceptable range after replacement.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PY3PNA042090AB packaged gas/electric unit (3.5-ton cooling, 90,000 BTU gas heat). Verify OEM part number 48GS400192 against your unit's data plate or wiring diagram before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us before placing your order.