OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model TCHC2550HECMRMY500

This is the genuine OEM Carrier Direct Spark Ignition (DSI) Control Board, part number LH33WP002, factory-specified for the Carrier TCHC2550HECMRMY500 packaged heating and cooling unit. The DSI control board serves as the brain of the ignition sequence — it manages spark timing, monitors flame rectification, and coordinates gas valve operation on every call for heat. When this board fails, common symptoms include a hard lockout with no ignition attempt, intermittent no-heat calls, erratic cycling, or a fault code indicating ignition failure after multiple retries. Replacing it with the correct OEM board restores factory-programmed timing and safety logic that aftermarket alternatives cannot always replicate.

• Specs: 460V application | Direct Spark Ignition (DSI) type | OEM part number LH33WP002 | Supersedes LH33WP002A
• OEM vs Generic: OEM DSI control boards carry factory-programmed ignition timing, retry lockout counts, and safety thresholds. Generic boards often use generalized firmware that can cause nuisance lockouts, mis-timed spark, or void equipment warranties on commercial units.
• Install Difficulty: 3/5 — Shut off power at the disconnect and verify zero voltage before touching any board terminals. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, phone camera to photograph all wiring harness positions before removal. Label every connector. Note: DSI boards on commercial packaged units may require a control board reset sequence after installation — consult the unit's service manual.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our climate-controlled warehouse.

Compatibility: Engineered as the direct OEM replacement for the Carrier TCHC2550HECMRMY500 packaged unit. Also used on select Carrier, Bryant, and Payne models in the 48, 574, 580, 581, 582, 583, 588, and 589 series — always confirm your unit's data plate and existing board part number before ordering. Our parts specialists are available to verify fitment prior to purchase.