OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PNA060090AB

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY3PNA060090AB packaged rooftop unit. As the nerve center of your unit's heating sequence, this microprocessor-based board orchestrates spark ignition, gas valve activation, inducer and blower fan motor operation, flame sensing, and safety switch monitoring. When this board fails, symptoms typically include a no-heat condition, repeated ignition lockout, short cycling, or the unit failing to advance past the pre-purge stage entirely.

• Specs: Direct Spark Ignition (DSI) type | Microprocessor-based control | Manages spark igniter, gas valve, combustion blower, and indoor blower motor | LED status/fault code diagnostics | Compatible with LH33WP003A revision
• OEM vs Generic: This is the genuine Carrier factory part — not an aftermarket substitute. OEM boards are manufactured to exact factory tolerances and timing sequences (pre-purge: 45 sec, trial for ignition: 5+2 sec). Aftermarket boards may introduce timing drift, nuisance lockouts, or voided unit warranties.
• Install Difficulty: 3/5 — Requires shutting off gas supply and 120V power at disconnect before servicing. Photograph all wiring harness connections before removal. Tools needed: 1/4" nut driver, needle-nose pliers, multimeter. Recommend licensed HVAC technician for gas appliance board replacement.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse in original Carrier factory packaging.

Compatibility: Designed as a direct factory replacement for the Carrier PY3PNA060090AB packaged rooftop unit. Also cross-references part number LH33WP003A. Verify your existing board's part number on the label before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — call or chat today.