OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PPA030080ACBA

This OEM Direct Spark Ignition (DSI) control board is the factory-specified replacement for the Carrier PY1PPA030080ACBA packaged rooftop unit. As the central brain of the heating system, the LH33WP003 orchestrates every stage of the ignition sequence — from inducer startup and spark generation to gas valve activation and steady-state flame monitoring. When this board fails, common symptoms include a complete no-heat condition, ignition lockout after one or more failed trials, erratic blower behavior, or a system that starts briefly then shuts down without establishing a call for heat.

• Specs: Direct Spark Ignition (DSI) microprocessor-based control | Manages combustion sequencing, blower/indoor fan motors, spark igniter, and gas valve | Integrated flame sensing and safety lockout logic | Onboard status LED fault code indicators for rapid diagnostics
• OEM vs Generic: This is a genuine Carrier OEM board manufactured to exact factory tolerances. Aftermarket boards may lack full LED diagnostic support, use lower-grade relays, or introduce timing mismatches that cause nuisance lockouts and premature component wear.
• Install difficulty: 3/5 — Disconnect power and verify zero voltage before handling the board. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, smartphone for wiring photos. Label every connector before removal. Always restore power at the breaker last, after all connectors are fully seated.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Verified fit for Carrier model PY1PPA030080ACBA packaged rooftop unit. Cross-references Carrier part number LH33WP003 and LH33WP003A revision boards. Confirm your existing board's part number on the label before ordering. Not sure it fits? Contact our HVAC parts specialists — we verify fitment before you buy.