OEM Carrier Flame Sensor (48GS400192) for Model PY3PNA042090NB

This is the genuine OEM Carrier flame sensor, part number 48GS400192, factory-specified for the Carrier PY3PNA042090NB gas furnace. The flame sensor is a critical safety component: after the hot surface igniter lights the burners, this rod-style sensor uses flame rectification to confirm combustion is present. If the control board doesn't receive a valid microamp signal within seconds, it shuts off the gas valve as a safety measure. A failed or carbon-coated flame sensor is one of the most common causes of furnace short-cycling — the furnace fires up, runs for 5–8 seconds, then shuts down and locks out.

• Specs: 90° angled sensing rod | Includes factory mounting bracket | Replacement OEM part number 48GS400192 | Flame rectification detection method | Approximate rod length 1.6" | Overall dimensions approx. 4.9" × 1.75"
• OEM vs Generic: This is a genuine Carrier OEM part, not an aftermarket substitute. OEM sensors maintain precise microamp output tolerances required by the Carrier IFC control board. Generic sensors can produce inconsistent readings, triggering nuisance lockouts or failing prematurely.
• Install Difficulty: 2/5 — Straightforward swap. Turn off gas and power at the disconnect before starting. Tools needed: 1/4" hex driver or nut driver, needle-nose pliers. Disconnect the single wire connector, remove the mounting screw, swap the sensor, and reconnect. Always clean the burner port area and inspect the wire harness for heat damage while you have access.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse in original factory packaging.

Compatibility: Designed for the Carrier PY3PNA042090NB gas furnace. Always verify your model and serial number on the data plate inside the furnace door before ordering. Need help confirming fitment? Our HVAC parts specialists are standing by — order with confidence and get it shipped today.