OEM Carrier Flame Sensor LH33WZ518 for Model PG9MXA060100AASA

This is the genuine OEM Carrier flame sensor (part number LH33WZ518), factory-specified for the Carrier PG9MXA060100AASA gas furnace. The flame sensor is a small but mission-critical safety component: once the igniter lights the burner, the flame rod generates a microamp DC signal that tells the control board a flame is present and it is safe to keep the gas valve open. When the sensor fails — most often due to oxidation or carbon buildup on the rod — the control board cannot confirm ignition and shuts off the gas within 5–8 seconds. The result is a furnace that lights briefly, then goes out and locks out after 3 attempts.

• OEM Part Number: LH33WZ518 | Genuine Carrier replacement | Factory-matched microamp sensing range for reliable flame confirmation
• OEM vs Generic: OEM sensors use the exact rod alloy and bracket geometry specified by Carrier engineering. Aftermarket versions can exhibit signal drift, causing nuisance lockouts even with a healthy flame.
• Install Difficulty: 2/5 — Turn off power and gas before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, fine steel wool or emery cloth (to clean mounting surface). Always verify gas is off and system has cooled before reaching into the heat exchanger area.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PG9MXA060100AASA gas furnace. Also fits select Bryant, Carrier, and Payne units in the PG9MXA0, 58MEC, 58MTA, 58MTB, 352AAV, 352MAV, and 353BAV series — always verify your unit's data plate and existing part number before ordering. Need fitment confirmation? Our HVAC parts team is available to verify compatibility before you buy.