OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PNA048130NB

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY3PNA048130NB packaged rooftop unit. As the central intelligence of the heating system, this Integrated Gas Control (IGC) board orchestrates the entire ignition sequence — managing spark ignition, gas valve activation, combustion blower, and indoor fan motors while continuously monitoring flame sensing and safety lockout conditions. When this board fails, symptoms typically include a no-heat call with repeated ignition lockout, the unit attempting ignition then shutting down, or status LED fault codes indicating a control board fault. Replacing with the genuine OEM part restores factory-calibrated timing and full diagnostic capability.

• Part Type: Direct Spark Ignition (DSI) / Integrated Gas Control (IGC) Board | OEM Part # LH33WP003 | Fits Carrier PY3PNA048130NB packaged rooftop units
• OEM vs Generic: This factory OEM board is manufactured to Carrier's exact original design standards, preserving full system compatibility, accurate fault-code diagnostics, and factory ignition timing. Aftermarket alternatives (such as ICM291) may omit nuanced timing calibrations and can void remaining equipment warranties.
• Install Difficulty: 3/5 — Requires full system lockout/tagout (LOTO) and discharge of control voltage before any board contact. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, smartphone to photograph all wiring connections and connector positions prior to removal. Recommend an HVAC-certified technician for rooftop unit service.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse — no backorder delays.

Compatibility: Designed for the Carrier PY3PNA048130NB packaged rooftop gas/electric unit. Verify your existing board's part number on the board label before ordering — superseded variant LH33WP003A is also covered. If you have a related Bryant or ICP rooftop unit using the same board, contact our fitment team for confirmation. Questions about compatibility? Our HVAC parts specialists verify fitment before you order — reach out via chat or phone for fast answers.