OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PPB048090AAAA

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY1PPB048090AAAA packaged gas/electric unit. The DSI control board is the nerve center of the heating system — it orchestrates the entire ignition sequence by managing the combustion, blower, and indoor fan motors, while also controlling the spark igniter and gas valve. It simultaneously monitors ignition trial timing, flame sensing, and safety lockout conditions to prevent hazards. When this board fails, symptoms typically include a no-heat condition, repeated ignition lockout faults, failure to light after the trial-for-ignition period, or the system shutting down after only a few seconds of burner operation.

• OEM Part Number: LH33WP003 | Description: Direct Spark Ignition (DSI) Control Board | Brand: Carrier | Factory-original replacement, no modifications required
• OEM vs Generic: This is the genuine Carrier OEM board, manufactured to exact factory specifications. Aftermarket boards may lack precise timing calibration for the DSI ignition sequence, risking nuisance lockouts, premature flame-sensor faults, or unsafe gas valve operation over time.
• Install Difficulty: 3/5 — Disconnect power and gas before servicing. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter, phone/camera to photograph all wiring harnesses before removal. Transfer wiring connectors one-at-a-time to avoid miswiring. Verify all safety interlocks re-seat properly.
• Warranty: 1-year OEM manufacturer warranty. Orders ship same business day from our stocked warehouse — no waiting on special orders.

Compatibility: Engineered as a direct OEM replacement for Carrier model PY1PPB048090AAAA. Always verify your existing board's part number against LH33WP003 or LH33WP003A before ordering. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy — reach out via chat or phone today.