OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PPB048115AAAA

This OEM Direct Spark Ignition (DSI) control board is the factory-specified replacement for the Carrier PY1PPB048115AAAA packaged gas/electric unit. The DSI control board serves as the brain of the heating system — it sequences the ignition process by energizing the inducer motor, proving the pressure switch, firing the direct spark igniter, monitoring the flame sensor, and managing the gas valve. When this board fails, you'll typically experience a no-heat condition, repeated ignition lockouts, erratic burner cycling, or fault codes that cannot be cleared by a simple reset. Replacing this board with the OEM-matched LH33WP003 restores factory ignition timing and full safety-circuit functionality.

• Specs: Direct Spark Ignition (DSI) control board | OEM Part Number: LH33WP003 | Factory-matched ignition timing and safety lockout sequences | Designed for Carrier packaged gas/electric systems
• OEM vs Generic: This OEM board is programmed to exact factory ignition timing, pressure-switch trip delays, and flame-sensing thresholds. Aftermarket boards may use generic timing that causes nuisance lockouts or — more dangerously — shortened flame-proving windows that mask real safety faults.
• Install Difficulty: 3/5 — Shut off gas and disconnect power at the breaker before beginning. Tools needed: 1/4" and 5/16" nut driver, needle-nose pliers, phone or camera to photograph all wiring harness connections prior to removal. Note any active fault codes before disconnecting the old board. Gas certification or qualified HVAC technician recommended.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier model PY1PPB048115AAAA packaged units. Always verify the OEM part number on your existing board's label before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you purchase — no guesswork required.