OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PPB030040AA

This OEM Direct Spark Ignition (DSI) control board is the factory-specified replacement for the Carrier PY2PPB030040AA packaged unit. The DSI control board serves as the brain of the heating system — orchestrating the ignition sequence, monitoring flame sensing, managing gas valve timing, and coordinating the inducer and blower motor. When this board fails, common symptoms include a complete no-heat condition, repeated ignition lockouts, fault codes on the unit, failure to advance through the ignition sequence, or intermittent heating that shuts down unexpectedly.

• Specs: Direct Spark Ignition (DSI) control board | OEM Part Number: LH33WP003 | Factory-matched replacement for Carrier PY2PPB030040AA packaged units | Manages ignition timing, flame sensing, inducer, and blower sequencing
• OEM vs Generic: This OEM board is manufactured to Carrier's exact factory specifications — identical firmware logic, timing tolerances, and terminal layout. Aftermarket boards frequently exhibit incorrect ignition timing or missing safety lockout logic, which can create unsafe operating conditions and void equipment warranties.
• Install difficulty: 3/5 — Requires shutting off gas supply and 120V power before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, phone or camera to photograph all wiring harnesses prior to disconnection. Take note of all DIP switch positions on the existing board before removal and replicate on the new board.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier model PY2PPB030040AA packaged units. Always cross-reference the part number on your existing board's label before ordering. If you have any questions about fitment, our technical team is available to verify compatibility before you buy — ensuring you get the right part the first time.