OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model PY3PEA042090AA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) Control Board (part number LH33WP002), the factory-specified replacement for the Carrier PY3PEA042090AA packaged gas/electric unit. The DSI control board serves as the central command module for the heating sequence — coordinating the inducer motor, gas valve, spark igniter, and flame sensor in precise timed stages. When this board fails, the unit will typically enter a hard lockout, refuse to initiate the ignition sequence, short-cycle on startup, or display a fault code indicating an ignition or control failure. Replacing it with the correct OEM board restores factory timing logic and full diagnostic LED functionality.

• Specs: Direct Spark Ignition (DSI) control board | 460V application | OEM part number LH33WP002 | Replaces legacy part LH33WP002A | Factory-matched timing sequences for inducer pre-purge, spark trial, and flame proving
• OEM vs Generic: OEM control boards use factory-calibrated ignition timing and lockout logic. Aftermarket boards often ship with generic timing profiles that can cause nuisance lockouts, improper gas valve sequencing, and voided equipment warranties — especially critical on 460V commercial packaged units.
• Install Difficulty: 3/5 — Disconnect all power before beginning. Tools needed: #2 Phillips and flathead screwdrivers, 1/4" and 5/16" nut drivers, needle-nose pliers, phone camera (photograph all wiring harness connections before removal). Note: 460V equipment — verify power is fully isolated at the disconnect and breaker before touching any terminals.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our stocked warehouse.

Compatibility: Designed for the Carrier PY3PEA042090AA packaged gas/electric unit. Also used across Carrier, Bryant, and Payne models in the 48, 574, 580, 581, 582, 583, 588, 589, and PY series — verify your model's data plate and existing part number before ordering. Our fitment team is available to confirm compatibility prior to purchase.