OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA060115NA

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY3PPA060115NA packaged gas heating and electric cooling unit. The DSI control board is the brain of the heating system — it orchestrates the entire ignition sequence by managing the spark igniter, gas valve, combustion blower, and indoor blower motor. It also continuously monitors the flame sensor signal, pressure switch status, and safety limit circuits. When this board fails, common symptoms include a complete no-heat lockout, a furnace that sparks but never lights, a unit that shuts down mid-cycle, or fault codes indicating an ignition failure on the system's diagnostic LED.

• Part Number: Carrier OEM LH33WP003 (also supersedes LH33WP003A) | Type: Microprocessor-based Direct Spark Ignition (DSI) control board
• OEM vs Generic: This genuine Carrier OEM board uses factory-matched firmware and connector configurations for a true drop-in fit. Aftermarket boards (such as the ICM291) may require jumper adjustments and can introduce timing variances that affect ignition reliability and warranty coverage.
• Install Difficulty: 3/5 — Disconnect power and gas before servicing. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone camera (photograph all wiring harness connections before removal). Transfer wiring harnesses one-by-one to avoid miswiring. Recommend a qualified HVAC technician for this repair.
• Warranty: 1-year OEM manufacturer warranty on parts. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered for Carrier model PY3PPA060115NA packaged rooftop gas/electric units. Verify your unit's existing board part number against LH33WP003 or LH33WP003A before ordering. If you need fitment confirmation, our HVAC parts specialists are standing by. Order now — in stock and ships today.