OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model PY3PEA048115AB

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP002, factory-specified for the Carrier PY3PEA048115AB packaged unit. The DSI control board is the nerve center of your unit's heating system — it coordinates the spark igniter, gas valve, combustion blower, indoor fan motor, and flame sensing circuit in precise timed sequence. When this board fails, symptoms include a hard lockout after one or more failed ignition attempts, the furnace section starting then immediately shutting down, erratic or no-heat operation, or an LED fault code indicating ignition or flame-sense failure.

• Part Specs: Direct Spark Ignition (DSI) microprocessor-based control board | OEM Part # LH33WP002 | Also supersedes LH33WP002A | Factory-matched timing, trial-for-ignition sequence, and lockout logic for Carrier packaged equipment
• OEM vs Generic: Genuine Carrier OEM boards are programmed with exact factory ignition timing, flame-sense thresholds, and blower delay parameters. Aftermarket boards can introduce off-spec timing that causes nuisance lockouts, premature heat exchanger stress, or voided equipment warranties.
• Install Difficulty: 3/5 — Disconnect power and gas before beginning. Tools needed: #2 Phillips screwdriver, 1/4" and 5/16" nut drivers, needle-nose pliers, camera or phone to photograph all wiring harness connections prior to removal. Verify no 24V control circuit voltage is present before handling the board. Recommended for qualified technicians.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed by 3 PM local time ship same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PEA048115AB packaged gas/electric unit and other Carrier, Bryant, and Payne models in the 48, 574, 580, 581, 582, 583, 588, 589, and PY series that specify the LH33WP002 DSI board. Always confirm your unit's data plate part number before ordering. Our HVAC parts specialists are available to verify fitment — contact us before you buy if you have any questions.