OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3GNA030060AB

This is the genuine OEM Direct Spark Ignition (DSI) control board for the Carrier PY3GNA030060AB packaged rooftop unit. The DSI control board is the central brain of the heating system — it orchestrates the entire ignition sequence, monitors critical safety sensors, controls the combustion and blower motors, fires the spark igniter, opens the gas valve, and continuously verifies flame presence through the flame rod. When this board fails, the unit will typically enter hard lockout, short-cycle on ignition attempts, or fail to produce any heat whatsoever. Do not overlook a failed DSI board when diagnosing repeated ignition faults or error codes on your rooftop unit.

• OEM Part Number: LH33WP003 (also supersedes LH33WP003A) | Carrier Direct Spark Ignition (DSI) microprocessor-based control board | Factory-matched for Carrier PY3GNA030060AB
• OEM vs Generic: This is a genuine Carrier OEM board — not an aftermarket substitute. OEM boards carry exact firmware, timing sequences, and terminal configurations. Aftermarket boards may use looser tolerances on trial-for-ignition timing and lockout logic, which can cause nuisance faults or unsafe conditions.
• Install Difficulty: 3/5 — Shut off all power and gas before beginning. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, a multimeter, and a camera or phone to photograph all wiring connections before disconnection. Transfer wires one at a time to avoid miswiring. Cycle the unit and verify all stages after installation.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered as the direct factory replacement for Carrier model PY3GNA030060AB packaged rooftop gas/electric units. Also fits other Carrier, Bryant, and Payne rooftop units that specify LH33WP003 or LH33WP003A — always verify the part number on your existing board's label before ordering. Our HVAC parts specialists are available to confirm fitment prior to purchase. Order now and this part ships today.