OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PPA042080ACBA

This is the genuine OEM Direct Spark Ignition (DSI) control board for the Carrier PY1PPA042080ACBA packaged gas/electric unit. As the brain of your heating system, this microprocessor-based board orchestrates every stage of the ignition sequence — from energizing the inducer motor and proving the pressure switch, to firing the spark igniter, opening the gas valve, and confirming a stable flame. When it fails, symptoms typically include a hard lockout with no ignition attempt, the system starting then shutting down after a few seconds, a non-functional blower, or fault codes flashing on the board's LED status indicators. Replacing the control board with the factory-matched OEM part restores full sequencing accuracy and keeps your equipment operating within warranty and code requirements.

• Part Number: LH33WP003 | Direct Spark Ignition (DSI) Integrated Control Board | Microprocessor-based with onboard LED fault-code diagnostics
• OEM vs Generic: OEM boards are manufactured to Carrier's exact electrical tolerances and timing sequences. Aftermarket substitutes may introduce ignition timing drift, nuisance lockouts, or incompatible blower delay profiles — risking comfort callbacks and voiding equipment warranties.
• Install Difficulty: 3/5 — Requires disconnecting 24V and line-voltage wiring harnesses and remounting to the control bracket. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone camera (photograph all wiring before removal). Recommended for qualified HVAC technicians. Always disconnect power at the disconnect box before servicing.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY1PPA042080ACBA packaged unit. Verify the OEM part number on your existing board's label before ordering — the suffix variant (LH33WP003 vs. LH33WP003A) should match. Not sure? Our fitment team confirms compatibility before your order ships — contact us with your full model and serial number.