OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PNA030060AB

This is the genuine OEM Carrier LH33WP003 Direct Spark Ignition (DSI) Control Board — the factory-specified replacement for the Carrier PY3PNA030060AB packaged unit. The DSI control board is the brain of the heating system: it sequences and times every stage of combustion, commands the spark igniter and gas valve, monitors the flame sensor, and drives both the combustion blower and indoor fan motors. When this board fails, symptoms typically include a hard lockout after one or more ignition attempts, intermittent no-heat calls, error fault codes, or a unit that powers on but never attempts ignition at all.

• Part Number: LH33WP003 (also supersedes LH33WP003A) | OEM Carrier / Bryant / Payne
• Function: Microprocessor-based DSI control — manages spark ignition timing, trial-for-ignition sequence, flame sensing, timed blower-off delay, and safety lockout logic
• OEM vs Generic: This factory OEM board ships pre-programmed with Carrier's exact timing and lockout parameters. Aftermarket boards (e.g. ICM291) may require jumper configuration and can introduce timing drift — OEM is always the safest choice for reliable, warranty-valid operation
• Install Difficulty: 3/5 — Requires isolating 24V control wiring, labeling and disconnecting all harness plugs, and swapping the board in the control compartment. Tools needed: insulated screwdrivers, needle-nose pliers, multimeter, and phone/camera to photograph wiring layout before removal. Always cut power at the disconnect before servicing.
• Warranty: 1-year OEM factory warranty. In stock — ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PNA030060AB packaged gas/electric unit. This board also fits select Bryant and Payne rooftop models sharing the LH33WP003/3A specification — verify your unit's data plate and existing board part number before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before every order — reach out before you buy.