OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PNB024060AA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY2PNB024060AA packaged rooftop unit. The DSI control board is the operational brain of your furnace or rooftop heating section — it sequences the entire ignition cycle, commands the gas valve, drives spark ignition, monitors the flame sensor, controls inducer and blower fan motors, and supervises all safety limit switches. When this board fails, symptoms typically include a hard lockout with no heat, repeated ignition attempts followed by shutdown, erratic blower behavior, or a completely unresponsive heating system. Replacing it with the genuine OEM part restores factory-programmed timing and safety logic.

• Part Type: Direct Spark Ignition (DSI) Microprocessor-Based Control Board | OEM Part # LH33WP003 (also fits LH33WP003A suffix variants)
• OEM vs Generic: OEM boards use Carrier's exact ignition timing sequences — pre-purge, trial-for-ignition, retry intervals, and lockout thresholds — ensuring full compatibility with the PY2PNB024060AA's safety architecture. Aftermarket boards may approximate these values, risking nuisance lockouts or unsafe ignition retries.
• Install Difficulty: 3/5 — Requires shutting off gas supply and disconnecting 24V and 120V power before proceeding. Tools needed: #2 Phillips screwdriver, 1/4" nut driver, needle-nose pliers, multimeter for voltage verification. Photograph all wiring harness connections before removal. Refer to unit wiring diagram on cabinet door.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered for the Carrier PY2PNB024060AA packaged rooftop unit. Cross-references with LH33WP003A. Always verify your existing board's part number on the board label before ordering to confirm an exact match. Our HVAC parts specialists are available to verify fitment — contact us before ordering if you have any questions.