OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PNA060115NB

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY3PNA060115NB packaged rooftop unit. As the central intelligence of your furnace or rooftop heating system, this microprocessor-based board orchestrates spark ignition, gas valve activation, inducer and blower fan motor operation, flame sensing, and system-wide safety lockout. When this board fails, you'll typically experience a no-heat condition, repeated ignition attempts followed by lockout, erratic blower behavior, or a furnace that starts briefly and then shuts down entirely. Replacing it with the correct OEM part restores factory-calibrated timing sequences and full diagnostic capability.

• Specs: Direct Spark Ignition (DSI) | Microprocessor-based design | Pre-purge: 45 sec | Trial for Ignition: 5+2 sec | Retry period: every 20 sec for 15 min | Manual-reset lockout | Post-purge: 45 sec | Onboard LED fault code diagnostics | Dimensions: 5 × 7 × 1.875 in
• OEM vs Generic: This is the genuine Carrier OEM board (LH33WP003), manufactured to exact factory specifications. Generic aftermarket boards may not replicate proprietary timing sequences or LED fault code logic, potentially causing nuisance lockouts, voided equipment warranties, and incorrect safety shutdowns. Always use OEM when servicing commercial rooftop units where liability and uptime matter.
• Install Difficulty: 3/5 — Shut off power and gas before beginning. Photograph all wiring harness connections prior to removal. Tools needed: #2 Phillips screwdriver, 1/4" nut driver, multimeter (to verify 24V control circuit), and a camera or phone for reference photos. Verify all limit switches and pressure switch wiring are re-seated firmly before restoring power. First-time board replacement recommended for experienced technicians.
• Warranty: 1-year OEM manufacturer warranty. In-stock — ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PNA060115NB packaged rooftop unit. Also referenced under part number LH33WP003A. Verify your unit's data plate and existing board part number before ordering. Our fitment specialists are available to confirm compatibility prior to purchase — same-day shipping available on all in-stock orders placed before 3 PM.