OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1RJA060074AAWA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, engineered as the factory-specified replacement for the Carrier PY1RJA060074AAWA rooftop unit. As the brain of your heating system, this Integrated Gas Control (IGC) board orchestrates every stage of the ignition sequence — from inducer startup and spark ignition through gas valve activation and steady-state flame monitoring. When this board fails, the most common symptoms include a complete no-heat condition, ignition lockout after one or more failed ignition attempts, erratic blower behavior, or the system cycling off immediately after startup without establishing a flame.

• Specs: Direct Spark Ignition (DSI) microprocessor-based control | Manages spark igniter, gas valve, blower motor, and inducer motor | Integrated LED fault-code diagnostics for rapid troubleshooting | Factory-matched to Carrier PY1RJA060074AAWA rooftop unit specifications
• OEM vs Generic: This OEM board is manufactured to Carrier's exact original design standards, ensuring full pin-for-pin compatibility, precise timing sequences, and preserved system safety lockouts. Aftermarket boards may deviate in ignition timing or lockout logic, risking nuisance trips or reduced safety margins.
• Install difficulty: 3/5 — Requires disconnecting 24V and line-voltage wiring harnesses. Always shut off power at the disconnect and tag-out before servicing. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, and a multimeter. Photograph all wiring connections before removal. Recommend verifying 24V control circuit integrity after installation.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse. Includes original Carrier packaging.

Compatibility: Designed for the Carrier PY1RJA060074AAWA commercial rooftop unit. This board also fits a range of Carrier and Bryant packaged rooftop units sharing the LH33WP003 specification — verify your unit's data plate and existing board part number before ordering. Our HVAC parts specialists are available to confirm fitment at no charge. Order now — in stock and ships today.