OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PNB030040AA

This is the factory OEM Direct Spark Ignition (DSI) Control Board (part number LH33WP003) for the Carrier PY2PNB030040AA packaged heating unit. The DSI control board is the command center of the furnace or packaged unit's heating system — it sequences the inducer motor, spark ignition, gas valve, and flame verification in precise timing. When this board fails, common symptoms include a no-heat condition, repeated ignition lockout, burners that light and immediately shut off, or a unit that fails to advance past the inducer pre-purge stage.

• Part Specs: Direct Spark Ignition (DSI) control board | OEM part number LH33WP003 | Factory-matched control logic for Carrier PY2PNB030040AA | 24V control circuit compatible
• OEM vs Generic: This is a genuine Carrier OEM board — not an aftermarket substitute. OEM boards maintain exact ignition timing, lockout sequencing, and fault code diagnostics. Generic boards can introduce mismatched timing that causes nuisance lockouts or premature component wear.
• Install Difficulty: 3/5 — Requires disconnecting power and gas before servicing. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone/camera to photograph all wiring harness connections before removal. Match all connector positions exactly on reinstall. Recommend verifying 24V transformer output before condemning the board.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before 3PM ship same business day from our warehouse.

Compatibility: This board is engineered specifically for the Carrier PY2PNB030040AA packaged unit. Always confirm the OEM part number on your existing board's label before ordering to ensure an exact fit. If you have any questions about compatibility, our HVAC parts specialists verify fitment before you order — no guesswork required. In stock and ships today.