OEM Carrier Flame Sensor Assembly LH33WZ005 for Model PY1PNA042100ADBA

This OEM Carrier flame sensor assembly (part #LH33WZ005) is the factory-specified replacement for the Carrier PY1PNA042100ADBA packaged unit. The flame sensor is a safety-critical component: it uses electrical rectification to verify that a burner flame is present after ignition. When the sensor rod becomes coated with oxidation or carbon buildup — or fails outright — the control board cannot confirm ignition and shuts the burner off within 5 to 8 seconds, resulting in a no-heat lockout condition. Replacing the sensor with an OEM part restores factory-precise signal thresholds and prevents nuisance lockouts caused by out-of-spec aftermarket rods.

• Part Number: LH33WZ005 | Factory Authorized Parts (Carrier OEM) | Includes 64.5" wire lead and mounting hardware
• OEM vs Generic: OEM sensors are calibrated to exact microamp output specifications for the Carrier control board. Generic sensors often operate outside tolerance, causing intermittent lockouts even after cleaning.
• Install Difficulty: 2/5 — Shut off gas and 24V power before servicing. Tools needed: 1/4" hex driver, needle-nose pliers, multimeter (to verify µA signal after install). Route wire lead clear of heat exchanger surfaces.
• Warranty: 1-year OEM factory warranty. Ships same business day from our stocked warehouse.

Compatibility: Engineered for the Carrier PY1PNA042100ADBA packaged unit. Verify your existing sensor's wire lead length and mounting bracket style against your unit's data plate before ordering. Our HVAC parts team is available to confirm fitment before you buy — no guesswork required.