OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model PY1REA036074ABWB

This is the factory OEM Direct Spark Ignition (DSI) Control Board (part number LH33WP002) for the Carrier PY1REA036074ABWB packaged unit. The DSI control board is the brain of the heating system — it sequences and monitors the entire ignition cycle, from energizing the inducer motor and proving the pressure switch, to firing the direct spark igniter and verifying flame establishment. When this board fails, the unit will typically enter a hard lockout after one or more failed ignition attempts, display fault codes, or produce no heat at all despite the thermostat calling for it.

• Part Number: LH33WP002 (also supersedes LH33WP-002) | OEM Direct Spark Ignition (DSI) Control Board | Factory-original Carrier replacement | 460V ignition control module
• OEM vs Generic: OEM boards are programmed with Carrier's exact ignition timing, flame-sensing thresholds, and safety lockout logic. Aftermarket boards may use generic parameters that cause nuisance lockouts, void equipment warranties, or introduce unsafe ignition timing deviations.
• Install Difficulty: 4/5 — Requires disconnecting 24V control wiring, line-voltage harnesses, and flame sensor leads. Always shut off gas supply and 120V power at the disconnect before servicing. Tools needed: Phillips and flat-head screwdrivers, 1/4" nut driver, needle-nose pliers, phone camera (photograph all wiring before removal). Recommend a qualified HVAC technician for this repair.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed as the factory-specified DSI control board for Carrier model PY1REA036074ABWB. Always verify the part number on your existing board's label before ordering — revisions (e.g., LH33WP002A) are also compatible. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you order — contact us anytime.