OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PPB060090AA

This is the factory OEM Direct Spark Ignition (DSI) Control Board (part number LH33WP003) for the Carrier PY2PPB060090AA packaged rooftop unit. As the brain of your system's combustion sequence, this microprocessor-based board orchestrates spark ignition, gas valve operation, blower motor timing, and indoor fan staging — all while continuously monitoring flame sensing, inducer proving, and safety lockout logic. When this board fails, typical symptoms include a no-heat condition with no ignition spark, repeated ignition lockout faults, erratic blower operation, or a system that powers on but never advances past the prepurge stage.

• Part Number: LH33WP003 (also supersedes LH33WP003A) | OEM Carrier Direct Spark Ignition (DSI) Control Board | Factory-matched microprocessor logic for PY2PPB060090AA
• OEM vs Generic: This is a genuine OEM Carrier board — not a third-party substitute. OEM boards retain factory-calibrated ignition timing, trial-for-ignition duration, and lockout sequences. Aftermarket boards may introduce timing drift that triggers nuisance lockouts or reduces heat exchanger life.
• Install Difficulty: 3/5 — Requires disconnecting 24V control wiring, line-voltage blower leads, and flame sensor harness. Photograph all connectors before removal. Tools needed: insulated screwdrivers, needle-nose pliers, multimeter. Always shut off gas supply and power at the disconnect before servicing.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY2PPB060090AA packaged rooftop gas/electric unit. This board also cross-references with LH33WP003A suffix variants. Verify your existing board's part number on the label before ordering. Not sure it fits? Contact our HVAC parts specialists — we verify fitment before you buy.