OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PNB060130AA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY2PNB060130AA packaged rooftop unit. As the brain of the heating system, this microprocessor-based board orchestrates every step of the ignition sequence — from inducer pre-purge and spark firing to gas valve activation, flame sensing, and blower motor staging. When it fails, symptoms typically include a no-heat lockout after an ignition attempt, a furnace that starts and immediately shuts down, erratic blower behavior, or an LED fault code indicating ignition or flame-sense failure.

• Specs: Direct Spark Ignition (DSI) microprocessor control | Manages spark igniter, gas valve, inducer fan motor, and blower motor | LED fault-code diagnostics | Pre-purge: 45 sec | Trial for ignition: 5+2 sec | Manual-reset lockout | Post-purge: 45 sec | Factory OEM part number LH33WP003 / LH33WP003A
• OEM vs Generic: This is a genuine Carrier factory part, built to exact OEM tolerances and fully pre-programmed. Aftermarket boards (e.g., ICM291) can substitute but may differ in timing sequences, LED fault mapping, and long-term reliability under commercial duty cycles. OEM is always recommended for rooftop equipment subject to code inspection.
• Install Difficulty: 4/5 — Recommended for qualified HVAC technicians. Disconnect all power before proceeding. Photograph all wiring harness connections prior to removal. Tools needed: ¼" and 5/16" nut drivers, needle-nose pliers, multimeter. Re-enable gas supply and verify full ignition cycle before closing the unit.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Direct factory replacement for Carrier model PY2PNB060130AA packaged rooftop units using the LH33WP003 / LH33WP003A DSI control board. Verify your existing board's part number on the label before ordering. Compatible also with select Carrier and Bryant rooftop units sharing this DSI board. Questions about fitment? Our HVAC parts specialists confirm compatibility before every order — contact us today and ship the same day.