OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA036060AB

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board (part# LH33WP003), the factory-specified replacement for the Carrier PY3PPA036060AB packaged rooftop unit. The DSI control board is the central intelligence of your unit's heating system — it orchestrates spark ignition sequencing, gas valve activation, blower and indoor fan motor operation, flame sensing, inducer motor control, and full safety lockout logic. When this board fails, common symptoms include a no-heat condition, repeated ignition lockout after trial-for-ignition attempts, erratic blower behavior, or a system that starts briefly and then shuts down. Fault codes displayed on the board's status LED can help pinpoint whether the issue is a failed ignition trial, a flame-sensing fault, or a rollout/limit switch trip — making correct diagnosis critical before replacement.

• Part Type: Direct Spark Ignition (DSI) Integrated Control Board | OEM Part# LH33WP003 | Microprocessor-based design with onboard LED fault-code diagnostics
• OEM vs Generic: This is a genuine Carrier OEM board manufactured to exact factory specifications. Aftermarket boards may lack full compatibility with the PY3PPA036060AB's safety interlock sequences, risking nuisance lockouts or improper flame-sensing thresholds. OEM is always recommended for commercial rooftop applications.
• Install Difficulty: 3/5 — Disconnect power and verify zero voltage before opening the control compartment. Photograph all wiring harness connections before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Note all jumper/DIP switch positions on the old board and replicate exactly on the new board before powering up.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered as a direct OEM replacement for the Carrier PY3PPA036060AB packaged rooftop unit. Also fits other Carrier, Bryant, and ICP commercial rooftop models that specify LH33WP003 — always verify your unit's data plate and existing board part number before ordering. Our technical team is available to confirm fitment. Order today and this ships fast — in-stock and ready to go.