OEM Carrier Flame Sensor LH33WZ520 for Model PG9YAA036060ACSS

This is the genuine OEM factory-authorized flame sensor (part number LH33WZ520) designed as a direct replacement for the Carrier PG9YAA036060ACSS gas furnace. The flame sensor is a critical safety component — a metal rod that detects the presence of a burner flame by passing a small microamp DC current through it. When the sensor becomes coated with oxidation or fails electrically, the furnace control board can no longer confirm combustion, triggering an automatic safety lockout. The classic symptom is a furnace that ignites, runs for 5–8 seconds, then shuts off and repeats the cycle before locking out.

• Part Number: LH33WZ520 | Factory Authorized Carrier OEM replacement | Genuine Carrier Corporation Replacement Components Division
• OEM vs Generic: This OEM sensor is manufactured to exact factory microamp sensitivity specifications. Generic flame sensors can have wider tolerance ranges, leading to nuisance lockouts or, worse, delayed safety shutoff — making OEM the only recommended choice for a safety-critical component.
• Install Difficulty: 2/5 — Turn off gas and 120V power to the furnace before beginning. Tools needed: 1/4" hex driver or 5/16" nut driver, needle-nose pliers. Disconnect the single wire connector, remove the one mounting screw, and swap the sensor. Light fine steel wool or emery cloth can be used to clean the rod tip on the new sensor if needed. Total time: approximately 15–20 minutes.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PG9YAA036060ACSS packaged gas furnace unit. Always verify your existing part number on the furnace's wiring diagram or data label before ordering. Need help confirming fitment? Our HVAC parts specialists are standing by — order with confidence from NationalHVACParts.com.