OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model TCHC2550HECMRAY100

This is the factory OEM Direct Spark Ignition (DSI) Control Board for the Carrier TCHC2550HECMRAY100 heating system. Part number LH33WP002 serves as the electronic brain of the ignition sequence — it manages spark timing, monitors flame presence, controls gas valve operation, and sequences the inducer and blower motors. When this board fails, the unit will typically enter a hard lockout, attempt repeated ignition cycles with no flame establishment, or fail to energize the gas valve entirely. A faulty DSI board is one of the most common causes of a no-heat call that does not resolve with igniter or flame sensor replacement alone.

• Specs: Direct Spark Ignition (DSI) control board | 460V application | Replaces superseded part LH33WP002A | Factory-matched timing and safety lockout sequences
• OEM vs Generic: OEM control boards use factory-programmed logic and tested components. Aftermarket boards may have incompatible ignition trial timing or lockout thresholds, leading to nuisance faults or unsafe operation — always use OEM for ignition controls.
• Install difficulty: 3/5 — Disconnect power and verify zero voltage before touching the board. Tools needed: 1/4" and 5/16" nut drivers, flathead screwdriver, smartphone camera (photograph all wiring harness connections before removal). Transfer wire harnesses one at a time to avoid miswiring.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for Carrier model TCHC2550HECMRAY100. Also used across select Carrier, Bryant, and Payne packaged and commercial heating units 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. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — contact us before placing your order.