OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model TCHC2550HECMRAY101

This is the genuine OEM Carrier Direct Spark Ignition (DSI) Control Board, part number LH33WP002, factory-specified for the Carrier TCHC2550HECMRAY101 packaged heating and cooling unit. The DSI control board is the central command module of the heating system — it sequences the ignition process, monitors flame presence, controls gas valve operation, and manages safety lockouts. When this board fails, common symptoms include a hard lockout with no ignition attempt, intermittent heating failures, a system that sparks but will not sustain flame, or error codes indicating a controls fault. Replacing it with the correct OEM board restores the precise factory timing sequences that aftermarket boards often cannot replicate.

• Specs: Direct Spark Ignition (DSI) type | 460V application | Replaces superseded part LH33WP002A | Factory-calibrated ignition timing and safety lockout logic
• OEM vs Generic: OEM boards carry factory-programmed ignition timing, flame-sensing sensitivity, and lockout parameters. Generic or remanufactured alternatives often have imprecise trial-for-ignition windows, which can lead to nuisance lockouts, shortened gas valve life, or unsafe operation — making OEM the only recommended choice for commercial equipment like the TCHC2550HECMRAY101.
• Install Difficulty: 3/5 — Shut off gas supply and disconnect power before beginning. Tools needed: flat-head and Phillips screwdrivers, 1/4" and 5/16" nut drivers, needle-nose pliers, smartphone or camera to photograph all wiring harness connections prior to removal. Transfer all connectors carefully; incorrect wiring can damage the new board. Recommend verifying correct operation with a qualified technician after installation.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as the factory-direct replacement for Carrier model TCHC2550HECMRAY101. Also fits select Carrier, Bryant, and Payne models in the 48, 574, 580, 581, 582, 583, 588, and 589 series — verify your unit's data plate and existing board part number before ordering. Our fitment team is available to confirm compatibility before you purchase.