OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA060090NA

This is the OEM-specified Direct Spark Ignition (DSI) control board for the Carrier PY3PPA060090NA packaged gas/electric unit. As the brain of your heating system, this microprocessor-based board orchestrates the entire combustion sequence — controlling the spark igniter, gas valve, combustion blower, and indoor blower motor. It continuously monitors safety timing, flame sensing, trial-for-ignition sequences, and lockout conditions. When it fails, symptoms typically include a complete no-heat lockout, a furnace that sparks but never lights, erratic cycling, or a system that powers on but never initiates a heat call. Fault codes on the board's LED can help pinpoint the root cause before ordering.

• OEM Part Number: LH33WP003 (also supersedes LH33WP003A) | Manufacturer: Carrier | Board Type: Direct Spark Ignition (DSI), Microprocessor-Based
• OEM vs Generic: This OEM board ships with factory-matched timing sequences, flame-sensing thresholds, and lockout logic precisely calibrated for the PY3PPA060090NA. Aftermarket boards may use broader tolerances that trigger nuisance lockouts or mask real safety faults — a serious risk on gas appliances.
• Install Difficulty: 3/5 — Disconnect power and gas before beginning. Document all wiring connections with photos prior to removal. Tools needed: ¼" and 5/16" nut drivers, needle-nose pliers, phone camera. All connectors are keyed; do not force. Restore power and run a full heating cycle to verify normal LED status before closing the unit.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model PY3PPA060090NA packaged gas/electric units. Verify your existing board's part number against LH33WP003 or LH33WP003A before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you purchase — contact us before ordering if you have any questions.