OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model PY3PEA048115NB

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP002, factory-specified for the Carrier PY3PEA048115NB packaged gas/electric unit. The DSI control board is the nerve center of your system's heating sequence — it manages the ignition trial, monitors the flame sensor signal, controls the gas valve, and sequences the inducer and blower motors. When this board fails, symptoms typically include a hard lockout with no ignition attempt, repeated ignition trials followed by a fault lockout, erratic burner cycling, or a completely unresponsive heating system despite power being present.

• Part Number: LH33WP002 (supersedes LH33WP002A) | Direct Spark Ignition (DSI) type | 460V application | Genuine Carrier OEM board with factory-matched firmware and timing sequences
• OEM vs Generic: OEM DSI boards use factory-calibrated ignition trial timing, flame-proving thresholds, and lockout logic. Aftermarket boards frequently ship with mismatched timing parameters that cause nuisance lockouts, premature heat exchanger wear, or void equipment warranties.
• Install Difficulty: 3/5 — Requires disconnecting 120V power and 24V control wiring harnesses. Tools needed: ¼" and 5/16" nut drivers, needle-nose pliers, phone camera for wiring documentation. Always photograph all connector positions before removal. Allow capacitors to discharge before handling board.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as the direct factory replacement for Carrier PY3PEA048115NB packaged units. Also fits select Carrier, Bryant, and Payne models in the 48, 574, 580, 581, 582, 583, 588, 589, and PY series — verify your unit's data plate and existing board part number before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your system back on line fast.