OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PPB048090NBAA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY1PPB048090NBAA packaged gas/electric unit. As the brain of the heating system, this microprocessor-based board orchestrates combustion sequencing — controlling the spark igniter and gas valve, managing blower and indoor motor operation, monitoring flame sensing, and enforcing ignition trial timing and safety lockout. When this board fails, common symptoms include a no-heat condition, repeated ignition lockout faults, burners that light and immediately shut off, or erratic blower behavior that points directly to a board-level failure rather than a sensor or motor issue.

• Part Number: LH33WP003 (also replaces LH33WP003A) | Direct Spark Ignition (DSI) type | Microprocessor-based logic control | Factory-matched for Carrier PY1PPB048090NBAA
• OEM vs Generic: This is a genuine Carrier OEM board — not an aftermarket substitute. OEM boards are pre-programmed with exact ignition trial timing, lockout thresholds, and blower delay profiles specific to your unit. Aftermarket boards may require jumper reconfiguration and can introduce nuisance lockouts or shortened component life.
• Install Difficulty: 3/5 — Requires disconnecting 24V control wiring harness and line-voltage connections. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, phone or camera to photograph wiring before removal. Always shut off gas supply and disconnect power at the disconnect box before servicing. A qualified HVAC technician is recommended for gas appliance board replacement.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Designed for the Carrier PY1PPB048090NBAA packaged unit. Verify your existing board's part number on the board label before ordering — this board also replaces the LH33WP003A variant. If you are unsure of fitment, our team verifies compatibility before you order. In stock and ready to ship today — get your system back online fast.