OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3GNA060115NB

This is the genuine OEM Carrier LH33WP003 Direct Spark Ignition (DSI) Control Board — the factory-specified replacement for the Carrier PY3GNA060115NB packaged gas unit. The DSI control board is the brain of your furnace or rooftop unit's heating system. It manages spark ignition sequencing, gas valve activation, blower and indoor fan motor operation, flame sensing, inducer motor control, and safety lockout. When this board fails, symptoms typically include a no-heat condition, repeated ignition attempts followed by lockout, the system short-cycling, or erratic blower behavior. LED fault codes on the board itself can help confirm the diagnosis before ordering.

• Part Type: Direct Spark Ignition (DSI) Integrated Furnace Control Board | OEM Part # LH33WP003 | Fits Carrier PY3GNA060115NB packaged gas units
• OEM vs Generic: This is a genuine Carrier OEM board manufactured to original factory specifications — not an aftermarket substitute. OEM boards ensure full compatibility with all safety sensors, correct timing sequences, and preserve manufacturer warranty coverage where applicable. Aftermarket boards may exhibit mistimed ignition trials or incompatible fault-code behavior.
• Install Difficulty: 3/5 — Requires disconnecting 120V and 24V wiring harnesses, documenting all terminal connections before removal, and handling static-sensitive electronics. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, smartphone for wiring photos, and a multimeter for pre/post verification. Always shut off gas supply and disconnect power at the disconnect box before beginning.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Factory-matched for Carrier model PY3GNA060115NB packaged gas heating unit. Always verify your existing board's part number on the label before ordering to confirm fitment. Compatible with the LH33WP003A variant revision. Have questions about compatibility? Our HVAC parts team confirms fitment before you order — reach out before you buy.