OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1RPA072115ACWA

This is the genuine OEM Direct Spark Ignition (DSI) Control Board for the Carrier PY1RPA072115ACWA packaged HVAC unit. The DSI control board is the brain of your system's heating sequence — it orchestrates the inducer motor, spark ignition, gas valve, and flame sensing in a precise, timed cycle. When this board fails, common symptoms include ignition lockout faults, failure to light with no audible spark, repeated short-cycling on heat calls, or a complete no-heat condition with the system appearing otherwise powered. Replacing the board with a genuine OEM part ensures the factory-specified ignition timing, safety lockout logic, and diagnostic fault codes are fully preserved.

• OEM Part Number: LH33WP003 | Type: Direct Spark Ignition (DSI) Control Board | Factory-direct replacement for Carrier PY1RPA072115ACWA
• OEM vs Generic: This is a genuine Carrier OEM board — not an aftermarket substitute. OEM boards maintain exact ignition timing windows, lockout sequences, and LED fault code outputs that generic boards frequently get wrong, risking nuisance lockouts or unsafe ignition retries.
• Install Difficulty: 3/5 — Requires shutting off gas supply and 120V power at the disconnect before servicing. Tools needed: Phillips and flathead screwdrivers, needle-nose pliers, phone camera (photograph all wiring harness connections before removal). Take note of all jumper settings on the original board and replicate them on the new board.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct factory replacement for Carrier model PY1RPA072115ACWA. Always verify the OEM part number LH33WP003 against your unit's data plate and wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment — we verify before you buy. Order today for same-day shipping.