OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model PY1PEA042120ACBA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) Control Board, part number LH33WP002, factory-specified for the Carrier PY1PEA042120ACBA packaged unit. The DSI control board serves as the command center of the heating system — it sequences the inducer motor, manages the spark ignition trial, monitors the flame sensor signal, and controls gas valve operation. When this board fails, common symptoms include a complete no-heat condition, repeated ignition lockout faults, failure to advance through the heating sequence, or erratic cycling that never results in a sustained flame.

• Part Specs: OEM Part # LH33WP002 | Replaces LH33WP002A | Direct Spark Ignition (DSI) control type | 460V application | Factory-matched firmware and timing logic for Carrier PY-series packaged units
• OEM vs Generic: Genuine Carrier OEM boards use factory-calibrated ignition timing and flame-sensing thresholds. Aftermarket boards may carry wider tolerances, potentially causing nuisance lockouts, premature shutdowns, or voided equipment warranties — especially critical on commercial packaged units.
• Install Difficulty: 3/5 — Power down and lock out the unit before beginning. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone or camera to photograph all wiring harness connections prior to removal. Transfer wiring one connector at a time to avoid miswiring. Confirm all safety interlocks are reconnected before restoring power.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY1PEA042120ACBA packaged unit and other Carrier, Bryant, and Payne models in the 48, 574, 580, 581, 582, 583, 588, 589, and PY series that use the LH33WP002 DSI control board. Always verify your existing board's part number on the label before ordering to confirm an exact match. Have questions about fitment? Our HVAC parts specialists verify compatibility before every order — reach out before you buy.