OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PNA030040ACBA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY1PNA030040ACBA packaged rooftop unit. The DSI control board serves as the operational brain of your unit's heating system — it manages spark ignition sequencing, gas valve activation, blower and indoor fan motor control, flame sensing, inducer motor operation, and safety lockout functions. When this board fails, common symptoms include a complete no-heat condition, repeated ignition lockouts, short cycling, or the unit failing to progress past the ignition trial period. Fault codes displayed on the board's LED indicators are the fastest diagnostic path to confirming a failed board.

• Part Type: Direct Spark Ignition (DSI) Integrated Control Board | OEM Part # LH33WP003 | Manufacturer: Carrier
• OEM vs Generic: This is a genuine Carrier OEM board manufactured to original factory specifications, ensuring full compatibility with all safety sensors, wiring harnesses, and timing sequences on the PY1PNA030040ACBA. Aftermarket boards may introduce timing mismatches or connector incompatibilities that compromise reliability.
• Install Difficulty: 3/5 — Requires safe lockout/tagout of all electrical and gas supply before beginning. Tools needed: ¼" nut driver, needle-nose pliers, multimeter, and phone/camera to photograph all wiring connections prior to removal. Transfer wiring harness connectors one at a time to avoid miswiring. Board is typically panel-mounted with 2–4 screws.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Confirmed for Carrier model PY1PNA030040ACBA packaged rooftop unit. Verify your existing board's part number on the label before ordering — look for LH33WP003 or LH33WP003A. If you are unsure of fitment, our HVAC parts specialists will cross-reference your model and serial number before your order ships. Order now — in stock and ships today.