OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model PY3PEA048115AA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) Control Board (part number LH33WP002), the factory-specified replacement for the Carrier PY3PEA048115AA packaged gas/electric unit. The DSI control board serves as the brain of the heating system — it sequences the inducer motor, fires the spark igniter, monitors the flame sensor signal, controls the gas valve, and manages blower timing. When this board fails, you'll typically see a hard lockout with no ignition attempt, intermittent no-heat calls, or the unit cycling through a trial-for-ignition and then locking out without establishing flame.

• Part Specs: Direct Spark Ignition (DSI) microprocessor-based control board | OEM part number LH33WP002 (supersedes LH33WP002A) | Factory-matched for Carrier PY-series packaged units | Weight: 0.66 lbs
• OEM vs Generic: This is a genuine Carrier OEM board — not an aftermarket substitute. OEM boards carry exact firmware logic, terminal layout, and timing sequences engineered for your unit. Aftermarket boards can introduce nuisance lockouts, incorrect blower delays, and voided equipment warranties.
• Install Difficulty: 3/5 — Requires disconnecting 24V and line-voltage harnesses and documenting all connector positions before removal. Recommended tools: #2 Phillips screwdriver, 1/4″ and 5/16″ nut drivers, smartphone for wiring photos, multimeter for pre/post-install voltage verification. Always shut off the gas supply and disconnect power at the disconnect box before servicing.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed for the Carrier PY3PEA048115AA packaged gas/electric unit. Also used across a broad range of Carrier, Bryant, and Payne models in the 48, 574, 580, 581, 582, 583, 588, 589, and PY series — verify your model and data plate part number before ordering. Our parts specialists are available to confirm fitment at no charge.