OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA060090AB

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY3PPA060090AB packaged gas/electric unit. The DSI control board serves as the central brain of the heating system — it sequences combustion, manages the blower and indoor motors, fires the spark igniter, opens the gas valve, and continuously monitors flame sensing, trial-for-ignition timing, and safety lockout conditions. When this board fails, symptoms typically include a complete no-heat condition, repeated ignition lockout faults, a furnace that sparks but never lights, or a system that starts briefly then shuts down and locks out within seconds. Fault codes on the board's LED indicator can help pinpoint the exact failure mode before replacement.

• Part Number: Carrier OEM Part No. LH33WP003 (also supersedes LH33WP003A) | Board Type: Microprocessor-Based Direct Spark Ignition (DSI) Control
• OEM vs Generic: This is a genuine Carrier OEM board — factory-programmed with exact timing sequences, lockout thresholds, and flame-sensing sensitivity for the PY3PPA060090AB. Aftermarket boards may deviate from OEM timing specs, leading to nuisance lockouts or reduced system safety.
• Install Difficulty: 3/5 — Requires disconnecting 24V and line-voltage wiring harnesses, flame sensor lead, spark igniter cable, and gas valve connector. Always kill power at the disconnect and photograph all wiring before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, phone camera for documentation.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier model PY3PPA060090AB packaged unit. Verify your existing board's part number against LH33WP003 or LH33WP003A before ordering. Our technical team is available to confirm fitment — contact us before you buy if you have any questions.