OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model PY1REA036074ABWA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) Control Board, part number LH33WP002, factory-specified for the Carrier PY1REA036074ABWA packaged unit. The DSI control board is the nerve center of the heating system — it sequences the induced draft blower, manages spark ignition timing, monitors the flame sensor signal, and enforces safety lockout protocols. When this board fails, common symptoms include a no-heat condition, repeated ignition lockout faults, failure to prove flame, erratic burner cycling, or a completely unresponsive heating sequence despite good gas pressure and a functioning igniter.

• Specs: Direct Spark Ignition (DSI) control board | 460V application | OEM part number LH33WP002 | Replaces legacy part LH33WP002A | Factory-matched logic and timing sequences
• OEM vs Generic: Genuine Carrier OEM boards use factory-programmed microcontrollers with exact ignition timing, trial-for-ignition duration, and lockout thresholds. Aftermarket boards often have imprecise timing tolerances that can cause nuisance lockouts, premature component wear, or unsafe ignition sequences.
• Install difficulty: 3/5 — Disconnect all power before servicing. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, smartphone (photograph all wiring harness connections before removal). Transfer connectors one-by-one to avoid miswiring. Recheck all 24V and line-voltage terminals before restoring power.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY1REA036074ABWA packaged unit. Also used on select Carrier, Bryant, and Payne models in the 48, 574, 580, 581, 582, 583, 588, 589, and PY series — always verify your unit's data plate and existing part number before ordering. Our fitment team is available to confirm compatibility prior to purchase.