OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PNB024060AC

This is the genuine OEM Carrier LH33WP003 Direct Spark Ignition (DSI) Control Board — the factory-specified replacement for the Carrier PY2PNB024060AC packaged rooftop unit. The DSI control board is the central intelligence of the heating system: it sequences spark ignition, manages gas valve activation, controls the blower and indoor fan motors, monitors flame sensing, and enforces safety lockout protocols. When this board fails, symptoms include a complete no-heat condition, ignition lockout after a failed trial-for-ignition, erratic blower behavior, or a unit that starts briefly and shuts itself down.

• Part Specifications: OEM Part# LH33WP003 | Direct Spark Ignition (DSI) microprocessor-based control | Integrated gas valve control, spark igniter output, and flame sensing circuit | LED diagnostic indicators for fast fault code identification
• OEM vs Generic: This is a genuine Carrier OEM board manufactured to original factory specifications — not an aftermarket substitute. OEM boards preserve full compatibility with all safety interlocks, timing sequences, and diagnostic codes specific to the PY2PNB024060AC. Generic boards may not replicate proprietary timing logic, risking nuisance lockouts or unsafe ignition behavior.
• Install Difficulty: 3/5 — Intermediate skill level recommended. Disconnect all power and gas before beginning. Tools needed: ¼" and 5/16" nut drivers, needle-nose pliers, multimeter, phone/camera to photograph all wiring harness connections prior to removal. Label every connector before disconnecting. Consult the unit's wiring diagram on the panel door throughout installation.
• Warranty & Shipping: Backed by Carrier's OEM parts warranty. In stock and ships same business day from our warehouse — get your unit back online fast.

Compatibility: Engineered as the direct drop-in replacement for the Carrier PY2PNB024060AC packaged rooftop unit. Always verify the part number printed on your existing board before ordering. If you have any questions about fitment, our HVAC parts specialists are available to confirm compatibility before you buy.