OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PPB036090AAAA

This is the genuine OEM Carrier LH33WP003 Direct Spark Ignition (DSI) Control Board, the factory-specified replacement for the Carrier PY1PPB036090AAAA packaged gas/electric unit. The DSI control board is the brain of your system's heating sequence — it orchestrates the combustion process by controlling the spark igniter and gas valve, managing blower and indoor motor operation, and continuously monitoring flame sensing, trial-for-ignition timing, and safety lockout logic. When this board fails, you'll typically experience a complete no-heat condition, repeated ignition lockouts, short-cycling after burner light-off, or a system that attempts ignition but shuts down immediately without establishing a stable flame.

• Part Number & Type: OEM Carrier LH33WP003 | Direct Spark Ignition (DSI) Microprocessor-Based Control Board | Monitors combustion, blower, spark igniter, gas valve, flame sensing, and safety lockout
• OEM vs Generic: This is the genuine factory OEM board — not an aftermarket substitute. OEM boards carry the exact firmware, timing sequences, and safety trip points programmed for your unit. Generic boards may use mismatched lockout timing or flame-sense thresholds, leading to nuisance shutdowns or reduced safety margin.
• Install Difficulty: 4/5 — Control board replacement on a packaged rooftop/gas-electric unit requires disconnecting 120V and 24V wiring harnesses, documenting all connector positions before removal, and confirming proper ground continuity post-install. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, camera/phone for wiring photo documentation. Recommend a licensed HVAC technician for this repair.
• Warranty & Shipping: 1-year OEM factory warranty against defects. In stock — ships same business day from our warehouse.

Compatibility: Directly fits Carrier model PY1PPB036090AAAA packaged gas/electric units. Also replaces LH33WP003A variant boards. Verify your existing board's part number on the board label before ordering. Our fitment team is available to confirm compatibility before you purchase — just reach out with your full model and serial number.