OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1RPA150224ADWA

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY1RPA150224ADWA rooftop and packaged gas unit. As the brain of your heating system, this integrated ignition control board orchestrates every critical combustion function — from spark ignition and gas valve activation to blower motor sequencing, inducer motor control, flame sensing, and safety lockout. When this board fails, symptoms typically include a complete no-heat condition, repeated ignition lockout fault codes, erratic blower behavior, or a unit that sparks but fails to sustain a flame.

• Part Number: LH33WP003 | OEM Carrier Direct Spark Ignition (DSI) Integrated Circuit Board | Factory-original replacement, manufactured to Carrier's exact design specifications
• Key Functions: Controls spark ignition, gas valve open/close sequencing, combustion blower and indoor fan motors, flame sensing and trial-for-ignition timing, and automatic safety lockout with microprocessor-based LED fault code diagnostics
• OEM vs Generic: This OEM board is built to Carrier's exact firmware and hardware tolerances, ensuring full compatibility with all onboard sensors, safeties, and communicating controls on the PY1RPA150224ADWA. Generic aftermarket boards may lack proper lockout timing or LED diagnostic functions, risking nuisance trips or unsafe operation.
• Install Difficulty: 3/5 — Disconnect power and gas before starting. Tools needed: #2 Phillips and flat-blade screwdrivers, needle-nose pliers, phone or camera to photograph all wiring harness connections prior to removal. Transfer wiring harnesses one-at-a-time to avoid misconnection. Confirm all flame sensor and pressure switch leads are fully seated after installation.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier PY1RPA150224ADWA packaged rooftop gas/electric unit. Also fits select Carrier, Bryant, and ICP rooftop platforms sharing the LH33WP003 board — verify your unit's data plate and existing board part number before ordering. Our HVAC parts specialists are available to confirm fitment at no charge.