OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3GNA060115AB

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY3GNA060115AB packaged rooftop unit. The DSI control board serves as the central nervous system of the heating circuit — it orchestrates spark ignition sequencing, gas valve activation, combustion blower operation, indoor fan motor staging, flame sensing, and safety lockout logic. When this board fails, common symptoms include a furnace that attempts ignition but locks out, a unit stuck in continuous trial-for-ignition, no-heat calls with no fault response, or erratic blower behavior that cannot be resolved by thermostat adjustments.

• Part Type: Direct Spark Ignition (DSI) Integrated Furnace Control (IFC) Board | OEM Part# LH33WP003 | Fits Carrier PY3GNA060115AB packaged rooftop units
• OEM vs Generic: This is a genuine Carrier OEM board — not an ICM aftermarket substitute. OEM boards preserve factory timing sequences, lockout thresholds, and diagnostic LED fault codes. Aftermarket boards may introduce timing mismatches that trigger nuisance lockouts or mask true fault conditions.
• Install Difficulty: 3/5 — Disconnect power at the disconnect and verify zero voltage before handling. Tools needed: nut driver set, needle-nose pliers, multimeter, phone camera (photograph all wiring harness connections before removal). Note and clear any existing fault codes prior to board replacement.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse — in stock and ready to go.

Compatibility: Engineered and factory-matched for the Carrier PY3GNA060115AB packaged rooftop unit. Verify your unit's data plate matches part number LH33WP003 before ordering. Our team is available to confirm fitment — don't guess on a control board. Order now and this ships today.