OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PNA060090AA

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY3PNA060090AA packaged unit. The DSI control board is the nerve center of your unit's 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, common symptoms include a complete no-heat condition, repeated ignition lockouts, an inducer motor that runs but never advances to spark, or a system that lights and immediately shuts back down due to a failed flame-sensing signal.

• Specs: Direct Spark Ignition (DSI) microprocessor-based control | Manages spark igniter, gas valve, inducer fan, and blower motor | Integrated LED fault-code diagnostics | 45-second pre-purge and post-purge timing | 5+2 second trial for ignition | Manual-reset lockout after failed ignition sequence
• OEM vs Generic: This OEM board is manufactured to Carrier's exact factory specifications, ensuring full compatibility with all safety switch inputs (limit, pressure, flame rod) and proper sequencing timing. Aftermarket boards may deviate in pre-purge timing and lockout logic, potentially causing nuisance faults or voiding equipment warranties.
• Install Difficulty: 3/5 — Control board replacement requires powering down and locking out the unit, photographing all wire connections before removal, and careful transfer of each harness connector. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, phone/camera for wiring documentation. Recommend a qualified HVAC technician for this repair.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed as the factory-specified replacement DSI control board for the Carrier PY3PNA060090AA packaged unit. Verify OEM part number LH33WP003 against your unit's data plate or existing board label before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — reach out before placing your order.