OEM Carrier Flame Sensor LH680534 (Replaces LH33WZ521) for Model PG95SAS30040AAAA

This is the genuine OEM Carrier flame sensor with lead wire, part number LH680534, the current factory-authorized replacement for the discontinued LH33WZ521. It is the direct, drop-in fit for the Carrier PG95SAS30040AAAA 95% AFUE gas furnace. The flame sensor is a safety-critical component: a small metal rod positioned in the burner flame that passes a micro-amp current through the flame to confirm ignition. When the sensor fails or becomes coated with oxidation, the furnace control board cannot verify flame presence and will shut off the gas valve — typically after 5 to 8 seconds of operation — triggering a lockout fault and leaving you without heat.

• OEM Part Numbers: LH680534 (current) | LH33WZ521 (superseded/discontinued) — this listing ships the current LH680534 revision, which includes a pre-attached lead wire for easy plug-in installation.
• OEM vs Generic: Genuine Carrier OEM sensors are manufactured to exact rod geometry, insulation thickness, and micro-amp response specifications. Generic aftermarket sensors may read flame current outside the control board's acceptance window, causing nuisance lockouts even after installation.
• Install Difficulty: 2/5 — Turn off power and gas before starting. The sensor is secured by a single 1/4" hex-head screw inside the burner compartment. Tools needed: 1/4" nut driver, needle-nose pliers. Lightly clean rod with fine steel wool before re-use or install new sensor. Reconnect lead connector and restore power to verify operation.
• Warranty: 1-year OEM manufacturer's warranty against defects. Ships same business day from our warehouse when ordered by 3:00 PM local time.

Compatibility: Engineered for the Carrier PG95SAS30040AAAA 40,000 BTU 95% AFUE single-stage gas furnace. Also cross-references to multiple Carrier, Bryant, and Payne furnace models. Always verify your unit's model and data plate before ordering — our parts specialists are available to confirm fitment at no charge. Order now and get your furnace back up and running — same-day shipping available.