OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PPB048130AA

This is the genuine OEM Direct Spark Ignition (DSI) control board for the Carrier PY2PPB048130AA packaged rooftop unit. As the central command module for the heating system, this board manages the complete ignition sequence — firing the spark igniter, opening the gas valve, verifying flame via the flame sensor rod, and orchestrating the blower and inducer motors. When this board fails, the unit may enter a hard lockout, cycle off immediately after ignition, fail to spark entirely, or exhibit erratic heating behavior with fault codes displayed at the thermostat. This is a high-failure-rate component on aging rooftop units and should be inspected first when troubleshooting no-heat calls.

• OEM Part Number: LH33WP003 | Manufacturer: Carrier | Type: Direct Spark Ignition (DSI) Microprocessor-Based Control Board
• OEM vs Generic: This is a factory-original Carrier board with exact firmware, timing sequences, and connector configurations matched to the PY2PPB048130AA. Aftermarket boards (e.g., ICM291) may substitute but can introduce timing variances that affect lockout sensitivity and blower delays — OEM eliminates that risk entirely.
• Install Difficulty: 3/5 — Requires safely de-energizing the unit at the disconnect and documenting all wiring harness connections before removal. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone camera for wiring photos, and a multimeter to verify 24V control voltage. Board mounts on a standoff bracket inside the control compartment.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our climate-controlled warehouse.

Compatibility: Engineered and factory-matched for the Carrier PY2PPB048130AA packaged rooftop gas/electric unit. Also compatible with select Carrier, Bryant, and Payne rooftop models sharing the LH33WP003 board specification — verify your unit's data plate and existing board part number before ordering. Our HVAC parts specialists are available to confirm fitment at no charge. Order before 3PM EST for same-day shipping.