OEM Carrier Flame Sensor for Model PG96VAT42060BBAA — LH33WZ521 / LH680534

This is the factory OEM flame sensor (flame rod) for the Carrier PG96VAT42060BBAA 96% AFUE two-stage gas furnace. The flame sensor is a critical safety component that confirms the presence of a flame in the burner assembly. It generates a small microamp signal through the flame rod — if that signal is absent or too weak (typically due to oxidation on the rod tip), the integrated furnace control board will cut gas flow within 5–8 seconds as a safety lockout. The result: your furnace lights briefly, then shuts off repeatedly, often with a fault code indicating "flame sense" or "failed ignition."

• Specs: OEM Carrier flame sensor rod | Replaces part numbers LH33WZ521 (sensor only) and LH680534 (sensor with lead harness) | Factory-matched microamp output | Fits 96% AFUE two-stage burner assembly
• OEM vs Generic: OEM sensors use factory-spec alloy rods with exact geometry for proper flame contact and signal strength. Generic sensors can have inconsistent coatings and rod angles, leading to nuisance lockouts or premature failure — especially problematic in two-stage furnaces with modulating flame patterns.
• Install difficulty: 2/5 — Turn off gas and 120V power before beginning. Tools needed: 1/4" hex driver or nut driver, needle-nose pliers. Disconnect the lead wire, remove the single mounting screw, swap the rod, reconnect lead, and restore power. Clean burner area of carbon deposits while the sensor is out.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Directly fits Carrier model PG96VAT42060BBAA packaged gas furnace. This listing covers both the bare sensor (LH33WZ521) and the sensor with lead harness (LH680534) — select the variant that matches your existing harness configuration. Verify your existing part number from the data plate or wiring diagram before ordering. Have a fitment question? Our HVAC parts specialists confirm compatibility before you buy.