OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PPB036090NBAA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY1PPB036090NBAA packaged rooftop unit. The DSI control board is the central intelligence of the heating system — it orchestrates spark ignition sequencing, gas valve activation, combustion blower and indoor fan motor operation, flame sensing, and safety lockout. When this board fails, symptoms typically include a no-heat condition, repeated ignition lockouts, burners lighting then immediately shutting off, or a complete loss of heating-stage response with no fault codes cycling on the system LEDs.

• Part Type: Direct Spark Ignition (DSI) Integrated Furnace Control Board | OEM Part # LH33WP003 | Microprocessor-based design with onboard status LED diagnostics for fast fault identification
• OEM vs Generic: This is a genuine Carrier OEM board manufactured to exact factory tolerances and sequencing logic. Aftermarket boards may use substitute timing parameters that cause nuisance lockouts, improper blower delays, or voided equipment warranties — OEM is always the correct choice for commercial rooftop applications.
• Install Difficulty: 3/5 — Requires disconnection of line voltage and 24V control wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, smartphone (photograph all wiring harness positions before removal). Recommended for qualified HVAC technicians. Always discharge capacitors and verify power is off before servicing the control compartment.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse — get your unit back online fast.

Compatibility: Designed for the Carrier PY1PPB036090NBAA packaged rooftop unit. Also fits a range of Carrier, Bryant, and ICP commercial rooftop models that use the LH33WP003 DSI control board — verify your unit's data plate and existing board part number before ordering. Our HVAC parts specialists are available to confirm fitment. Order now — in stock and ships today.