OEM Carrier Flame Sensor LH33WZ521 / LH680534 for Model PG8JEB036045AAJA

This is the genuine OEM Carrier flame sensor (part numbers LH33WZ521 and LH680534) factory-specified for the Carrier PG8JEB036045AAJA gas furnace. The flame sensor is a small but mission-critical rod that confirms a stable burner flame is present after ignition. It does this by passing a small microamp current through the flame itself — if the current isn't detected within seconds, the furnace control board locks out the gas valve as a safety measure. A dirty or failed flame sensor is one of the most common causes of a furnace that lights, then shuts off after 5–8 seconds, triggering a lockout fault code.

• OEM Part Numbers: LH33WZ521 (Flame Sensor) | LH680534 (Flame Sensor w/Lead — includes pigtail connector for direct plug-in installation)
• OEM vs Generic: Genuine Carrier OEM sensors are manufactured to exact microamp sensitivity specifications. Aftermarket sensors frequently read outside the acceptable µA range, causing nuisance lockouts or, worse, unsafe flame-detection failures. Don't risk it on a safety-critical component.
• Install Difficulty: 2/5 — Turn off furnace power and gas before beginning. Tools needed: 1/4" hex driver or small nut driver, fine steel wool or emery cloth (to clean the rod if reusing), and a multimeter (to verify µA output). The LH680534 w/Lead variant simplifies reconnection with a pre-attached wire harness.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day when ordered before cutoff.

Compatibility: Designed for the Carrier PG8JEB036045AAJA packaged gas furnace. LH680534 supersedes and replaces LH33WZ521 as well as earlier part numbers LH680014, LH680012, LH33WZ511, LH33WZ515, and LH33WZ517. Always verify your unit's data plate and existing part number before ordering. Our parts specialists are available to confirm fitment — just reach out before you buy. Order today and get same-day shipping!