OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PNB024040NB

This is the genuine OEM Carrier LH33WP003 Direct Spark Ignition (DSI) Control Board — the factory-specified replacement for the Carrier PY2PNB024040NB packaged rooftop unit. As the central intelligence of your unit's heating system, this board orchestrates every stage of the ignition sequence: energizing the inducer motor, initiating the spark igniter, opening the gas valve, confirming flame presence, and managing the blower motor — all while continuously monitoring safety inputs. When this board fails, symptoms include a complete no-heat condition, repeated ignition lockouts, erratic blower behavior, or fault codes that will not clear. Replacing it with the correct OEM part restores full factory functionality and avoids the compatibility risks associated with aftermarket alternatives.

• Part Type: Direct Spark Ignition (DSI) Integrated Furnace Control (IFC) Board | OEM Part Number: LH33WP003 | Fits Carrier PY2PNB024040NB
• OEM vs Generic: This factory-original board is engineered to Carrier's exact specifications, ensuring precise timing for trial-for-ignition, flame sensing thresholds, and safety lockout sequences. Generic boards may use broader tolerances that can cause nuisance lockouts or reduce system safety margins.
• Install Difficulty: 3/5 — Disconnect power and shut off gas before beginning. Label or photograph all wiring harness connections before removal. Tools needed: ¼" nut driver, flathead screwdriver, needle-nose pliers. Match wiring connectors one-to-one on the new board. Recommended for qualified HVAC technicians.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse.

Compatibility: Designed for the Carrier PY2PNB024040NB packaged rooftop gas/electric unit. Also cross-references with select Bryant and ICP rooftop models — verify your unit's data plate and existing board part number before ordering. Our HVAC parts specialists are available to confirm fitment prior to purchase. Order now — in stock and ships today.