OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PNB024040NC

This is the genuine OEM Carrier LH33WP003 Direct Spark Ignition (DSI) Control Board — the factory-specified replacement for the Carrier PY2PNB024040NC packaged rooftop unit. As the nerve center of your system's heating operation, this integrated control board orchestrates spark ignition sequencing, gas valve activation, combustion blower control, indoor fan motor operation, and continuous flame monitoring. When this board fails, typical symptoms include a no-heat condition, repeated ignition lockout with a flashing LED fault code, the unit attempting ignition then shutting off, or a complete loss of heating-stage response from the thermostat.

• Specs: Direct Spark Ignition (DSI) microprocessor-based control | Manages spark igniter, gas valve, combustion blower, and indoor fan motor | Integrated flame-sensing and trial-for-ignition timing | LED diagnostic fault-code indicators for fast field troubleshooting
• OEM vs Generic: This genuine Carrier OEM board is manufactured to exact factory tolerances and firmware specifications. Aftermarket substitutes may lack proper ignition timing calibration or flame-sensing sensitivity, risking nuisance lockouts or unsafe operation — especially critical on a commercial rooftop unit.
• Install Difficulty: 3/5 — Disconnect and lock out all power before beginning. Tools needed: nut driver set, needle-nose pliers, multimeter, and a smartphone or camera to photograph all wiring harness connections before removal. Transfer wiring connectors one-by-one to reduce error. Verify correct LED operation after reinstall before restoring gas supply.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed for the Carrier PY2PNB024040NC packaged rooftop unit. Always cross-reference the part number on your existing board's label before ordering — rooftop unit control boards can have revision suffixes (e.g., LH33WP003A) that may affect fit. Our HVAC parts specialists are available to verify fitment before you order. Order now — in stock and ships today.