OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA036090NA

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY3PPA036090NA packaged unit. As the nerve center of the heating system, this board orchestrates every stage of the ignition sequence — energizing the inducer, proving the pressure switch, triggering the direct spark igniter, verifying flame establishment, and opening the gas valve. When this board fails, symptoms include a complete no-heat condition, repeated ignition lockouts, failure to advance through the heating cycle, or erratic error codes on diagnostic LEDs. Replacing it with the correct OEM part ensures all timing sequences, fault thresholds, and safety shutdowns are factory-matched.

• Specs: 24 VAC control circuit | 208/230 VAC 60 Hz line voltage input | Direct Spark Ignition (DSI) sequence | Replaces LH33WP003 and LH33WP003A
• OEM vs Generic: OEM boards preserve exact ignition timing intervals and safety lockout thresholds. Aftermarket boards may deviate on trial-for-ignition timing, risking nuisance lockouts or — in rare cases — unsafe ignition sequences. OEM is always the recommended choice for packaged commercial units.
• Install Difficulty: 3/5 — Disconnect power and gas before beginning. Label all low-voltage wiring harness connections before removal. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, smartphone for wiring photo documentation. Firmware or DIP switch settings (if present) should be matched to the original board before power-up.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our stocked warehouse.

Compatibility: Designed for the Carrier PY3PPA036090NA packaged unit. Also cross-references OEM suffix variant LH33WP003A. Verify your unit's data plate and existing board part number before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions. In stock and ready to ship today.