OEM Carrier Flame Sensor Assembly LH33WZ005 for Model PY1PNA042120ACBA

This is the genuine OEM Carrier flame sensor assembly (part# LH33WZ005), the factory-specified replacement for the Carrier PY1PNA042120ACBA packaged unit. The flame sensor is a critical safety component — a flame rod that passes a small DC current through the burner flame to confirm ignition. When the sensor becomes coated with oxidation or fails entirely, the control board cannot verify that gas is burning safely and will shut the system down, typically 5–8 seconds after ignition. The result: a furnace or packaged unit that lights, briefly runs, then shuts off repeatedly — a classic short-cycling fault.

• Specs: OEM Carrier Flame Sensor Assembly | Part# LH33WZ005 | 64.5" wire lead | Factory-matched flame rod geometry and ceramic insulator for accurate microamp signal
• OEM vs Generic: Genuine OEM sensors maintain the precise rod angle and ceramic insulation rating required for reliable microamp detection. Aftermarket sensors may read false negatives under load, causing nuisance lockouts even when the burner is operating correctly.
• Install difficulty: 2/5 — Turn off power and gas before servicing. Tools needed: 1/4" hex driver or nut driver, needle-nose pliers, and a multimeter (to confirm microamp signal post-install). Photograph wire routing before disconnecting. The sensor mounts to the burner bracket with a single screw.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY1PNA042120ACBA packaged unit. Always verify your unit's model and data plate before ordering. Our HVAC parts specialists are available to confirm fitment — reach out before you buy if you have any questions. Order now and receive same-day shipping on all in-stock parts.