OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PPB042090AA

This is the genuine OEM Carrier LH33WP003 Direct Spark Ignition (DSI) Control Board — the factory-specified replacement for the Carrier PY2PPB042090AA packaged gas/electric unit. The DSI control board is the nerve center of your system's heating operation: it manages spark ignition sequencing, monitors the flame sensor, controls the gas valve, coordinates blower and inducer motor timing, and initiates safety lockout when a fault condition is detected. When this board fails, common symptoms include a no-heat condition, repeated ignition lockout codes, failure to light after trial-for-ignition, or erratic cycling that won't resolve with a simple reset.

• OEM Part Number: LH33WP003 | Board Type: Direct Spark Ignition (DSI) | Microprocessor-based combustion control | Factory-matched to Carrier PY2PPB042090AA specifications
• OEM vs Generic: This is the genuine Carrier OEM board — not a third-party substitute. OEM boards retain exact factory timing parameters for trial-for-ignition, flame-sensing thresholds, and lockout logic, eliminating the risk of nuisance faults or voided equipment warranties common with aftermarket alternatives.
• Install Difficulty: 3/5 — Requires shutting off gas supply and 120V power before servicing. Photograph all wiring harness connections before disconnecting. Tools needed: Phillips and flat-head screwdrivers, needle-nose pliers, a multimeter for post-install verification. Recommend a qualified HVAC technician for gas appliance control board replacement.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse — no waiting on special orders.

Compatibility: Directly fits Carrier model PY2PPB042090AA packaged gas/electric unit. Also compatible with select Carrier, Bryant, and Payne rooftop units using the LH33WP003 / LH33WP003A board. Always verify your existing board's part number on the label before ordering to confirm fitment. Have questions? Our HVAC parts specialists verify compatibility before you buy — reach out before placing your order.