OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3GNA042060AB

This is the OEM factory-specified Direct Spark Ignition (DSI) Control Board (part number LH33WP003) for the Carrier PY3GNA042060AB packaged rooftop unit. This microprocessor-based board controls combustion, blower and indoor motors, the spark igniter, and the gas valve, while monitoring timing, trial for ignition, flame sensing, and lockout. It also monitors safety sensors in order to detect unsafe conditions and shut down the system if necessary to prevent hazards. Common failure symptoms include the unit entering hard lockout after one or more ignition attempts, the furnace failing to produce heat entirely, or error codes indicating ignition fault or flame-sensing failure.

• OEM Part Number: LH33WP003 | Also supersedes LH33WP003A | Factory-original Carrier component with exact firmware and connector layout for the PY3GNA042060AB
• OEM vs Generic: Using real OEM controls enhances your HVAC unit's operational and energy efficiency, contributing to increased output and decreased costs over time. Generic aftermarket boards may lack model-specific timing calibration, risking repeated lockouts or unsafe ignition sequences.
• Install Difficulty: 3/5 — Disconnect power and gas before beginning. Label all wire harness connectors before removal. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, phone or camera (photo wiring before disconnecting). Verify gas valve wiring polarity. Recommend professional installation for rooftop units.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PY3GNA042060AB packaged rooftop gas/electric unit. Always cross-reference your unit's data plate and confirm the part number printed on your existing board before ordering. Our fitment team is available to verify compatibility before you purchase — no guesswork required.