OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PNB024060NB

This is the genuine OEM Carrier LH33WP003 Direct Spark Ignition (DSI) Control Board — the factory-specified replacement for the Carrier PY2PNB024060NB packaged unit. As the central brain of your system's combustion sequence, this microprocessor-based board controls spark ignition, gas valve operation, blower and indoor fan motors, flame sensing, and safety lockout logic. When it fails, you'll typically experience a no-heat condition, repeated ignition lockouts, failure to advance through the ignition sequence, or erratic blower behavior that no thermostat adjustment can resolve.

• Part Number: LH33WP003 (also supersedes LH33WP003A) | Direct Spark Ignition (DSI) microprocessor control board | Factory-matched for Carrier PY2PNB024060NB packaged units
• OEM vs Generic: This OEM board uses factory-calibrated timing for trial-for-ignition, flame sensing threshold, and lockout sequencing. Aftermarket boards may use approximate timing windows, increasing the risk of nuisance lockouts or unsafe ignition retries.
• Install Difficulty: 3/5 — Requires shutting off gas and electrical supply before beginning. Document all wire harness connections with photos before removal. Tools needed: #2 Phillips screwdriver, 1/4" and 5/16" nut drivers, needle-nose pliers, and a multimeter for post-install verification. A qualified HVAC technician is strongly recommended for this repair.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse — get your system back online fast.

Compatibility: Engineered as a direct drop-in replacement for the Carrier PY2PNB024060NB packaged gas/electric unit. Also fits additional Carrier, Bryant, and Payne rooftop and packaged equipment that originally used the LH33WP003 or LH33WP003A control board — verify your unit's data plate and OEM part number before ordering. Not sure if this fits? Contact our parts specialists and we'll confirm fitment before you buy. In stock and ships today.