OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA060130AA

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY3PPA060130AA packaged rooftop unit. As the brain of the heating system, this microprocessor-based board orchestrates every stage of the ignition sequence — from pre-purge and spark ignition to gas valve activation, flame sensing, blower motor control, and safety lockout. When this board fails, common symptoms include a complete no-heat condition, repeated ignition lockouts after failed spark attempts, erratic blower behavior, or fault codes flashing on the LED diagnostic indicator. Replacing it with the correct OEM board restores factory-precise timing and sequencing that aftermarket boards can only approximate.

• Part Number: LH33WP003 (also referenced as LH33WP003A) | Factory Authorized Carrier OEM replacement | Microprocessor-based DSI ignition control
• Key Functions: Controls spark ignition timing, gas valve activation, inducer/blower fan motors, flame sensing, limit switch monitoring, and manual-reset safety lockout — all in one integrated board.
• Install Difficulty: 3/5 — Requires disconnecting 24V control wiring, high-voltage blower leads, and multiple safety switch connectors. Photograph all wiring harnesses before removal. Tools needed: ¼" nut driver, needle-nose pliers, multimeter. Recommended for qualified HVAC technicians.
• OEM vs. Aftermarket: OEM boards are manufactured to Carrier's exact design specifications, preserving factory ignition timing, flame-sensing thresholds, and lockout logic. Aftermarket boards may introduce timing drift or incompatible fault sequences that can mask underlying system issues.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PPA060130AA packaged rooftop unit. Also fits select 48-series Carrier and Bryant packaged/rooftop units using the LH33WP003/LH33WP003A board — verify your unit's data plate and existing board part number before ordering. Not sure? Contact our fitment team before you buy.