OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model LC748LCCSRLYX2600

This is the genuine OEM Direct Spark Ignition (DSI) control board, part number LH33WP002, factory-specified for the Carrier LC748LCCSRLYX2600. The DSI control board is the brain of your furnace's ignition sequence — it orchestrates the inducer motor, spark ignition, gas valve timing, flame verification, and safety lockout logic. When this board fails, common symptoms include a no-heat condition, repeated ignition lockouts, failure to initiate the ignition spark, erratic cycling, or fault codes flashing on the board's diagnostic LED. Replacing with an OEM board ensures every timing sequence and safety threshold matches Carrier's factory specifications exactly.

• Specs: Direct Spark Ignition (DSI) control board | OEM part number LH33WP002 | 24V control circuit compatible | Integrated diagnostic LED fault codes | Factory-calibrated ignition and flame-sensing timing
• OEM vs Generic: OEM boards use factory-programmed microcontrollers with exact ignition timing, retry logic, and lockout thresholds. Aftermarket boards frequently use approximated timing curves that can cause nuisance lockouts, premature component wear, or unsafe ignition behavior — never compromise on a control board.
• Install difficulty: 3/5 — Disconnect power and gas before beginning. Tools needed: Phillips and flathead screwdrivers, needle-nose pliers, smartphone or camera to photograph all wiring harness connections prior to removal. Transfer wiring connectors one at a time to avoid miswiring. Restore power and cycle the thermostat to verify proper ignition sequence on completion.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our fulfillment warehouse — order by 3 PM local time for same-day dispatch.

Compatibility: This DSI control board is the direct factory replacement for Carrier model LC748LCCSRLYX2600. Always verify the OEM part number LH33WP002 against your existing board's label before ordering to confirm fitment on any variant configurations. Need help confirming compatibility? Our HVAC parts specialists verify fitment before you order — contact us before purchasing if you have any questions.