OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PNB024040AB

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY2PNB024040AB packaged rooftop unit. The control board serves as the central intelligence of the heating system — managing spark ignition sequencing, gas valve activation, combustion airflow, blower and indoor fan motor operation, flame sensing, and safety lockout. When this board fails, symptoms typically include a complete no-heat condition, the unit attempting ignition and locking out after repeated failed trials, erratic blower behavior, or a system that runs but shuts down unexpectedly within minutes of starting.

• Part Type: Direct Spark Ignition (DSI) Integrated Gas Ignition Control (IGC) Board | OEM Part Number: LH33WP003 | Microprocessor-based design with onboard LED fault-code diagnostics for fast field troubleshooting
• OEM vs Generic: This is a genuine Carrier OEM board manufactured to original factory specifications. Aftermarket substitutes may lack precise ignition timing tolerances and safety lockout logic, risking nuisance shutdowns, voided equipment warranties, and potential code compliance issues.
• Install Difficulty: 3/5 — Shut off gas supply and disconnect power before servicing. Document all wiring connections with photos prior to removal. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter. Recommend qualified HVAC technician for installation due to gas circuit involvement.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our stocked warehouse — order by 3PM local time for next-day delivery eligibility.

Compatibility: Engineered as a direct OEM replacement for the Carrier PY2PNB024040AB packaged rooftop unit. Also compatible with select Carrier and Bryant rooftop models using the LH33WP003 or LH33WP003A board. Always verify your unit's data plate and existing board part number before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you buy.