OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PPB036090ABAA

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY1PPB036090ABAA packaged rooftop unit. As the brain of the combustion system, this microprocessor-based board orchestrates the entire heating sequence — controlling the spark igniter and gas valve, managing combustion and blower motor timing, monitoring flame sensing, and enforcing safety lockout protocols. When this board fails, you'll typically see a no-heat condition, repeated ignition lockout fault codes, a furnace that sparks but never lights, or erratic blower behavior that won't resolve with a standard reset.

• OEM Part Number: LH33WP003 (also supersedes LH33WP003A) | Direct Spark Ignition (DSI) type | Microprocessor-based design | Factory-matched to Carrier PY1PPB036090ABAA specifications
• OEM vs Generic: This is the genuine Carrier OEM board — not an aftermarket clone. OEM boards retain exact timing sequences, fault code logic, and connector pinouts. Aftermarket substitutes often use approximated firmware that can cause nuisance lockouts or void equipment warranties.
• Install Difficulty: 3/5 — Disconnect power and gas before starting. Photograph all wiring harness connections before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter for input voltage verification. A qualified HVAC technician is recommended for rooftop packaged units.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PY1PPB036090ABAA packaged rooftop gas/electric unit. Verify your existing board's part number against LH33WP003 or LH33WP003A before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — contact us today and get your unit back online fast.