OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PNB048115AA

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY2PNB048115AA packaged rooftop unit. As the brain of the heating system, this integrated furnace control (IFC) board orchestrates every step of the ignition sequence — from inducer startup and spark ignition through gas valve activation, flame verification, and blower motor operation. When this board fails, symptoms typically include a no-heat condition, repeated ignition lockout, continuous spark without flame establishment, or LED fault codes indicating a failed ignition trial. If your unit starts an ignition attempt and then locks out after 2–3 tries, or if the heating sequence never initiates at all, this board is the most common root cause.

• Part Number: LH33WP003 | Direct Spark Ignition (DSI) Integrated Furnace Control Board | Factory Carrier OEM specification
• OEM vs Generic: This OEM board is manufactured to Carrier's exact design standards, ensuring full pin-for-pin compatibility and preserving system warranty integrity. Aftermarket boards may require jumper reconfiguration and can introduce timing mismatches that cause nuisance lockouts or premature heat exchanger stress.
• Install Difficulty: 3/5 — Recommended for licensed HVAC technicians. Shut off all power and gas before beginning. Photograph all harness connections before removal. Tools needed: ¼" nut driver, flathead screwdriver, needle-nose pliers, multimeter. Verify LED fault code sequence before condemning the board.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for the Carrier PY2PNB048115AA packaged rooftop gas/electric unit. Always cross-reference the part number on your existing board's label before ordering to confirm fitment. Need help verifying compatibility? Our HVAC parts specialists are available to confirm the correct part for your unit before you order — no guesswork required.