OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PNA036090AB

This is the genuine OEM Direct Spark Ignition (DSI) control board for the Carrier PY3PNA036090AB packaged rooftop unit. The board serves as the brain of the gas heating circuit — it sequences the spark igniter and gas valve, monitors the flame sensor signal, and commands the blower and inducer motors. When this board fails, you will typically experience a complete no-heat condition, repeated ignition lockouts, or a system that attempts to light and immediately shuts down without holding flame. Fault codes stored on the board's LED can help pinpoint whether the failure is in timing, flame sensing, or safety lockout logic.

• OEM Part Number: LH33WP003 (also supersedes LH33WP003A) | Microprocessor-based DSI control logic | Factory-calibrated ignition trial timing and lockout thresholds
• OEM vs Generic: This is the genuine Carrier-factory board — not an aftermarket substitute. OEM boards preserve the exact ignition trial timing, lockout sequences, and safety-sensor response thresholds that generic replacements often approximate, protecting your heat exchanger and gas valve from premature wear.
• Install Difficulty: 3/5 — Disconnect power and gas before servicing. Label and photograph all wire harness connectors before removal. Tools needed: 1/4" nut driver, needle-nose pliers, phone camera for wiring documentation. Clear any stored fault codes and cycle the unit through a full heating sequence after installation to confirm operation.
• Warranty: 1-year OEM factory warranty on parts. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PNA036090AB packaged rooftop gas/electric unit. Also fits other Carrier, Bryant, and Payne rooftop models originally equipped with the LH33WP003 or LH33WP003A DSI control board — verify your unit's control board part number on the inside of the access panel before ordering. Have a model or serial number? Our fitment team confirms compatibility before you buy.