OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1RPA036074ABWA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY1RPA036074ABWA packaged rooftop unit. As the brain of your heating system, this microprocessor-based board orchestrates every critical ignition and safety function. When it fails, you may experience a complete no-heat condition, repeated ignition lockouts, blower motor faults, or the unit cycling off shortly after a call for heat. Fault LED indicators on the board itself can help pinpoint the exact failure mode before replacement.

• Part Type: Direct Spark Ignition (DSI) Integrated Control Board | OEM Part# LH33WP003 | Fits Carrier PY1RPA036074ABWA packaged rooftop units
• OEM vs Generic: This factory-original board is manufactured to Carrier's exact design specifications, ensuring full compatibility with all onboard sensors, motors, and safety circuits. Aftermarket alternatives may not replicate original timing sequences or lockout logic, risking nuisance shutdowns or undetected unsafe conditions.
• Install Difficulty: 3/5 — Requires disconnecting 24V control wiring harnesses, high-voltage blower motor leads, and gas valve connections. Tools needed: Phillips and flat-head screwdrivers, 1/4" nut driver, multimeter, and phone or camera to photograph all wiring before removal. Always shut off power and gas supply before beginning. Recommended for qualified HVAC technicians.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse — order by 3 PM local time for next-day delivery to most US locations.

Compatibility: Engineered as the direct OEM replacement for Carrier model PY1RPA036074ABWA packaged rooftop units equipped with Direct Spark Ignition. Verify your existing board's part number on the label before ordering to confirm an exact match. Have questions about fitment? Our HVAC parts specialists verify compatibility before you order — contact us today and get back up and running fast.