OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PNA030040NA

This is the genuine OEM Direct Spark Ignition (DSI) control board for the Carrier PY3PNA030040NA packaged unit. As the central brain of the heating system, this board manages the entire ignition sequence — energizing the inducer motor, proving the pressure switch, firing the spark igniter, and monitoring the flame sensor for a safe and confirmed burner light-off. When this board fails, common symptoms include a hard lockout with no heat, failure to advance through the ignition sequence, intermittent heating loss, or fault codes indicating ignition or flame-proving errors.

• Specs: Direct Spark Ignition (DSI) control | 24 VAC control voltage | 208/230 VAC 60Hz system voltage | Replaces LH33WP003 and LH33WP003A
• OEM vs Generic: This genuine Carrier OEM board is pre-programmed to factory ignition timing, lockout thresholds, and safety-shutdown logic. Aftermarket boards may use generalized timing that causes nuisance lockouts or fails to meet unit-specific safety requirements.
• Install difficulty: 3/5 — Disconnect power and gas before servicing. Tools needed: ¼" nut driver, needle-nose pliers, phone/camera to photograph wiring harness before removal. Transfer all connector plugs one at a time to avoid miswiring. Verify correct lockout reset procedure after installation.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as the factory-specified replacement for Carrier model PY3PNA030040NA. Also cross-references to part number LH33WP003A. Always confirm your unit's control voltage and board part number on the equipment data label before ordering. Need fitment verification? Our HVAC parts specialists confirm compatibility before you buy — contact us today and get your unit back online fast.