OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PNB030040AB

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY2PNB030040AB packaged rooftop unit. The DSI control board is the brain of the heating system — it orchestrates spark ignition sequencing, gas valve activation, inducer and blower motor operation, flame sensing, and safety lockout logic. When this board fails, you may experience a no-heat condition, repeated ignition lockouts, or erratic fan behavior with no fault recovery. LED diagnostics on the board help technicians pinpoint fault codes during troubleshooting.

• Specs: Direct Spark Ignition (DSI) microprocessor-based control | Manages combustion, blower, and indoor fan motors | Monitors spark igniter, gas valve, flame sensing, and safety lockout | Status LED fault code indicators for fast diagnostics | Factory part number: LH33WP003 / LH33WP003A
• OEM vs Generic: This is a genuine Carrier factory-authorized OEM board manufactured to exact original design standards. Aftermarket substitutes may not match timing sequences, lockout parameters, or connector layouts — risking misdiagnosis, voided warranties, or recurring failure. OEM is always the correct choice for commercial rooftop applications.
• Install difficulty: 3/5 — Disconnect power at the disconnect box and verify zero voltage before touching any board terminals. Tools needed: Phillips and flat-head screwdrivers, needle-nose pliers, smartphone or camera to photograph all wiring harness connections before removal. Transfer wiring one connector at a time. Re-verify all safety switch connections before restoring power.
• Warranty: 1-year OEM factory warranty on this part. In stock and ships same business day from our warehouse when ordered before cutoff.

Compatibility: Factory-matched replacement for Carrier model PY2PNB030040AB packaged rooftop unit. Verify your existing board's part number (LH33WP003 or LH33WP003A) against your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions.