OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA042060NA

This is the factory OEM Direct Spark Ignition (DSI) Control Board for the Carrier PY3PPA042060NA packaged gas/electric unit. The DSI control board is the brain of your system's ignition sequence — it orchestrates combustion airflow, spark ignition, flame sensing, gas valve operation, and blower motor staging. When this board fails, the unit will typically enter a hard lockout after a failed ignition attempt, leaving the system with no heat. Other symptoms include erratic cycling, failure to prove flame, or a complete loss of all control functions.

• Part Number: LH33WP003 | Direct Spark Ignition (DSI) Control Board | Factory OEM Carrier replacement
• OEM vs Generic: OEM boards carry factory-programmed timing sequences, lockout thresholds, and fault codes specific to your Carrier unit. Aftermarket boards may use universal timing that accelerates heat exchanger wear or causes nuisance lockouts — always specify OEM for DSI applications.
• Install Difficulty: 3/5 — Disconnect power at the breaker and gas supply before beginning. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter, phone camera (photograph all wiring harness positions before removal). Label each connector. Board replacement typically takes 45–60 minutes for an experienced technician.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PY3PPA042060NA packaged unit. Also cross-references with select Bryant and Payne rooftop units that originally specified the LH33WP003 board — verify your unit's data plate and wiring diagram before ordering. If you have any questions about fitment, our HVAC parts specialists confirm compatibility before your order ships.