OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA036060NB

This is the genuine OEM Direct Spark Ignition (DSI) control board for the Carrier PY3PPA036060NB packaged rooftop unit. As the central intelligence of your heating system, this board manages spark ignition sequencing, gas valve activation, combustion blower control, and real-time flame sensing. When it fails, symptoms typically include a no-heat condition, ignition lockout after one or more failed trials, erratic blower operation, or a system that starts briefly then shuts down — often with a fault LED code on the board itself.

• Part Type: Direct Spark Ignition (DSI) Integrated Furnace Control Board | OEM Part # LH33WP003 | Microprocessor-based design with onboard status LED fault diagnostics
• OEM vs Generic: This factory-authorized OEM board is engineered to Carrier's original design specifications, ensuring full compatibility with the PY3PPA036060NB's ignition timing, flame-sensing thresholds, and safety lockout logic. Aftermarket boards may use different timing tolerances, risking nuisance lockouts or unsafe ignition behavior.
• Install Difficulty: 3/5 — Requires disconnecting 24V control wiring, high-voltage blower leads, and gas valve connections. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter for pre-install voltage verification. Always confirm power is off at the disconnect and take a clear photo of all wiring harnesses before removal. Recommended for experienced DIYers or licensed HVAC technicians.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse — get your unit back online fast.

Compatibility: Engineered as the direct OEM replacement for Carrier model PY3PPA036060NB packaged rooftop units equipped with a Direct Spark Ignition heating system. Verify your existing board's part number (LH33WP003 or LH33WP003A) against your unit's data plate before ordering. Not sure? Our HVAC parts specialists are available to confirm fitment before you buy.