OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3GNA060090AB

This OEM Direct Spark Ignition (DSI) control board is the factory-specified replacement for the Carrier PY3GNA060090AB packaged gas unit. As the brain of the heating system, the DSI control board manages combustion sequencing, blower and indoor motor operation, spark ignition timing, flame sensing, and safety lockout logic. When this board fails, common symptoms include a furnace that won't ignite, a system that locks out after one or two ignition attempts, erratic blower behavior, or a unit that powers on but produces no heat whatsoever.

• Part Number: LH33WP003 | OEM Carrier Direct Spark Ignition (DSI) Control Board | Microprocessor-based design | Factory-matched to PY3GNA060090AB specifications
• OEM vs Generic: This is a genuine Carrier OEM board — not an aftermarket substitute. OEM boards preserve factory-calibrated ignition timing, flame-sensing thresholds, and lockout sequences. Aftermarket boards can introduce nuisance lockouts or void equipment warranties.
• Install Difficulty: 3/5 — Requires disconnecting 24V control wiring harnesses, gas valve connections, and flame sensor leads. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Always cut power at the disconnect and photograph all wiring before removal. Professional installation recommended.
• Warranty: 1-year OEM factory warranty. Ships same business day from our climate-controlled warehouse.

Compatibility: Engineered for the Carrier PY3GNA060090AB packaged gas unit. Verify your existing board's part number (LH33WP003 or LH33WP003A) against your unit's data plate before ordering. This board also cross-references with select Bryant and Day & Night rooftop units sharing the same DSI ignition platform. Not sure if this is the right board? Our HVAC parts specialists confirm fitment before every order — reach out before you buy.