OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA042060AA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) Control Board, part number LH33WP003, factory-specified for the Carrier PY3PPA042060AA packaged rooftop unit. As the system's central intelligence, this microprocessor-based board orchestrates combustion sequencing, blower and indoor motor operation, spark ignition timing, flame sensing, and safety lockout — shutting down the system automatically if an unsafe condition is detected. Common failure symptoms include a hard lockout after ignition attempts, the unit starting then shutting off within seconds, no-heat calls that are not satisfied, or a complete loss of furnace operation with no error codes cycling through.

• Part Type: Direct Spark Ignition (DSI) Control Board | OEM Part Number: LH33WP003 | Also supersedes LH33WP003A
• OEM vs Generic: This genuine Carrier OEM board is factory-programmed with the exact ignition trial timing, flame-sensing thresholds, and lockout sequences required for the PY3PPA042060AA. Aftermarket boards may use generic timing profiles that cause nuisance lockouts or void equipment warranties.
• Install Difficulty: 3/5 — Requires shutting off gas and electrical supply before servicing. Photograph all wiring harness connections before removal. Tools needed: nut driver set, needle-nose pliers, multimeter. Confirm all fault codes are cleared after installation. Professional installation recommended.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our climate-controlled warehouse.

Compatibility: Engineered as a direct fit for the Carrier PY3PPA042060AA packaged rooftop unit. Always verify the OEM part number on your existing board's label before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions. Order now and we'll ship today.