OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PNB030060AB

This is the genuine OEM Carrier Direct Spark Ignition (DSI) Control Board, part number LH33WP003, factory-specified for the Carrier PY2PNB030060AB packaged rooftop unit. The DSI control board is the brain of your unit's heating system — it orchestrates the entire ignition sequence including spark ignition, gas valve activation, blower and indoor fan motor operation, flame sensing, inducer motor control, and safety lockout logic. When this board fails, the most common symptoms include a no-heat condition, repeated ignition lockout after a failed trial for ignition, erratic burner cycling, or a completely unresponsive unit with no fault code activity.

• Part Type: Direct Spark Ignition (DSI) Integrated Control Board | OEM Part# LH33WP003 | Fits Carrier PY2PNB030060AB packaged rooftop units
• OEM vs Generic: This is a genuine Carrier OEM board manufactured to original factory specifications. OEM boards preserve full diagnostic LED fault code functionality and ensure precise timing for ignition trials, flame sensing thresholds, and safety lockout — variables that aftermarket boards often approximate, risking nuisance lockouts or unsafe operation.
• Install Difficulty: 4/5 — This is a high-voltage commercial rooftop application. Disconnect all power at the unit disconnect before proceeding. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone or camera to photograph all wiring harness connections prior to removal. Recommend a qualified HVAC technician for this repair.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY2PNB030060AB packaged rooftop unit. Verify your existing board's part number against LH33WP003 or LH33WP003A before ordering. Cross-references the ICM Controls ICM291 as an aftermarket equivalent. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order — reach out before you buy.