OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model TCHC2550HECMRSY501

This is the genuine OEM Carrier Direct Spark Ignition (DSI) Control Board, part number LH33WP002, factory-specified for the Carrier TCHC2550HECMRSY501. The DSI control board is the central intelligence of your heating system — it sequences the ignition process, monitors the flame signal, controls the gas valve, manages inducer and blower timing, and executes safety lockout protocols. When this board fails, symptoms typically include a hard lockout with no ignition attempt, repeated ignition cycling with no sustained flame, error codes flashing on the board's diagnostic LED, or a complete loss of heating with no response from the furnace controls.

• Specs: Direct Spark Ignition (DSI) control board | 460V application | Replaces superseded part LH33WP002A | Factory-matched logic and timing sequences for safe, code-compliant operation
• OEM vs Generic: This is a genuine Carrier OEM board — not an aftermarket substitute. OEM boards preserve factory ignition timing, flame-sense thresholds, and safety lockout delays. Aftermarket boards may use mismatched timing that can cause nuisance lockouts or, worse, unsafe gas valve operation.
• Install difficulty: 3/5 — Disconnect power at the breaker and verify 0V before handling. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, phone/camera to photograph all harness connections before removal. Label every connector. Some installations may require a short blower off-delay reconfiguration after swap.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed for Carrier model TCHC2550HECMRSY501. Also referenced across select Carrier, Bryant, and Payne commercial and packaged unit platforms. Always cross-reference the part number on your existing board's label before ordering. Our team is available to verify fitment — contact us before you order if you have any questions.