OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA030040NA

This is the factory-original Direct Spark Ignition (DSI) Control Board (OEM part number LH33WP003) for the Carrier PY3PPA030040NA packaged gas/electric unit. The DSI control board acts as the brain of the heating system — it sequences the inducer motor, manages spark ignition timing, monitors the flame sensor signal, and responds to pressure switch and limit switch inputs. When this board fails, common symptoms include a no-heat condition with repeated ignition lockout, failure to initiate the inducer on a call for heat, continuous spark with no flame establishment, or diagnostic fault codes indicating ignition failure or control board error.

• Specs: Direct Spark Ignition (DSI) control | Factory-matched for Carrier PY3PPA030040NA | OEM part number LH33WP003 | 24V control circuit compatible | Includes onboard diagnostics / LED fault codes
• OEM vs Generic: This is the genuine Carrier OEM board — pre-programmed with exact ignition timing, lockout logic, and fault sequences specified for your unit. Aftermarket boards frequently require manual dip-switch configuration and may not replicate all safety lockout behaviors, risking nuisance trips or unsafe operation.
• Install difficulty: 3/5 — Requires shutting off gas supply and 120V power before starting. Tools needed: 1/4" and 5/16" nut drivers, flathead screwdriver, needle-nose pliers, and a phone/camera to document all wiring harness connections before removal. Note and match all connector positions exactly on reinstall.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships the same business day from our warehouse.

Compatibility: Designed specifically for the Carrier PY3PPA030040NA packaged unit. Always verify the OEM part number on your existing board's label before ordering to confirm an exact fit. If you have any fitment questions, our HVAC parts specialists verify compatibility before your order ships — no guesswork required.