OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PNA048115NA

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY3PNA048115NA packaged unit. As the brain of the heating system, this microprocessor-based board orchestrates the entire combustion sequence — controlling the spark igniter, gas valve, combustion blower, and indoor fan motor. It also continuously monitors safety sensors to detect unsafe conditions and initiate system lockout when necessary. When the board fails, common symptoms include a no-heat condition, repeated ignition lockout faults, failure to prove flame, or the unit cycling on and off erratically without completing a full heating sequence.

• OEM Part Number: LH33WP003 (also supersedes LH33WP003A) | Type: Direct Spark Ignition (DSI) Control Board | Application: Carrier PY3PNA048115NA packaged rooftop unit | Board Style: Integrated Furnace Control (IFC) with LCP
• OEM vs Generic: This is the genuine Carrier-sourced OEM board, factory-matched to your unit's exact timing sequences, lockout logic, and safety thresholds. Aftermarket boards may substitute components with looser tolerances, risking nuisance lockouts, improper gas valve timing, or premature failure.
• Install Difficulty: 3/5 — Requires shutting off power and gas supply before beginning. Photograph all wiring harness connections before disconnecting. Tools needed: ¼" nut driver, needle-nose pliers, multimeter. Always verify 24V control circuit is live before condemning the board. Consult the unit's wiring diagram located inside the cabinet door.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed as the direct OEM replacement for Carrier model PY3PNA048115NA packaged units equipped with the LH33WP003 or LH33WP003A DSI control board. Verify your existing board's part number on the label before ordering. Not sure if this fits? Contact our HVAC parts specialists — we verify fitment before you buy. In stock and ships today.