OEM Carrier Flame Sensor Assembly LH33WZ005 for Model PY1PPA042120ACBS

This is the genuine OEM Carrier flame sensor assembly (part #LH33WZ005) — the factory-specified replacement for the Carrier PY1PPA042120ACBS packaged heat pump unit. The flame sensor, also called a flame rod, monitors the burner to confirm ignition has occurred and signals the control board to keep the gas valve open. When the sensor fails or becomes coated with oxidation, the control board cannot confirm a stable flame and will shut off the gas valve — typically within 5 to 8 seconds of ignition — triggering a lockout fault. Replacing this sensor is one of the most common furnace/heat pump repairs and restores reliable heating operation.

• Specs: OEM Carrier flame sensor assembly | 64-1/2" wire lead | Factory Authorized Part (FAP) | Part # LH33WZ005 | Replaces cross-reference: 300138
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part — not an aftermarket substitute. OEM sensors are manufactured to exact rod geometry and ceramic insulator tolerances, ensuring accurate microamp flame signal readings and preventing nuisance lockouts caused by off-spec generic rods.
• Install Difficulty: 2/5 — Turn off power and gas before servicing. Tools needed: 1/4" hex driver or nut driver, needle-nose pliers, fine steel wool or emery cloth (to clean rod if reusing). Disconnect the wire lead, remove the single mounting screw, swap the sensor, reconnect the lead, and restore power. Always verify microamp signal with a multimeter after installation.
• Warranty: 1-year OEM factory warranty. In stock — ships same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for Carrier model PY1PPA042120ACBS packaged units. Verify your existing part number on the original sensor or unit wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment before you purchase — no guesswork required.