OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PNA036060AA

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY3PNA036060AA packaged rooftop unit. As the brain of the heating system, this microprocessor-based board orchestrates the entire ignition sequence — controlling the combustion and blower motors, firing the spark igniter, opening the gas valve, and monitoring flame sensing and lockout logic. When this board fails, symptoms include a complete no-heat condition, repeated ignition lockouts, erratic blower behavior, or a unit that sparks but never establishes or holds a flame. Replacing it with the correct OEM board restores factory-precise timing and safety logic.

• OEM Part Number: LH33WP003 (also supersedes LH33WP003A) | Direct Spark Ignition (DSI) type | Microprocessor-based combustion control | Factory-matched for Carrier PY3PNA036060AA
• OEM vs Generic: This OEM board preserves exact ignition timing windows, trial-for-ignition durations, and safety lockout thresholds specified by Carrier engineering. Aftermarket boards may use looser tolerances that can cause nuisance lockouts or, worse, unsafe ignition timing — never compromise on a control board.
• Install Difficulty: 3/5 — Requires shutting off 115V power and gas supply before beginning. Photograph all wiring harness connections before disconnecting. Tools needed: 1/4" and 5/16" nut driver, needle-nose pliers, multimeter. Verify all connector seating and restore power/gas before test firing. Recommend a qualified HVAC technician for this repair.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse — get your unit back online fast.

Compatibility: Direct OEM replacement for Carrier model PY3PNA036060AA packaged rooftop units. This board also fits select Carrier, Bryant, and Day & Night rooftop models using the LH33WP003/3A ignition control. Always verify your existing board's part number on the label before ordering. Need help confirming fitment? Our HVAC parts team is ready to verify before you buy.