OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model TCHC2550HECMRAY900

This is the genuine OEM Carrier Direct Spark Ignition (DSI) Control Board, part number LH33WP002, factory-specified for the Carrier TCHC2550HECMRAY900 unit. The DSI control board serves as the brain of the heating system — sequencing the ignition process, monitoring flame presence, managing the gas valve, inducer motor, and blower fan, and executing safety lockout logic. When this board fails, common symptoms include a complete no-heat condition, repeated ignition trial lockouts, intermittent heating faults, or erratic blower behavior that cannot be resolved by resetting the thermostat.

• Specs: Direct Spark Ignition (DSI) control board | 460V application | OEM part number LH33WP002 | Replaces superseded part LH33WP002A | Factory-matched firmware and relay logic for Carrier equipment
• OEM vs Generic: This is a genuine Carrier OEM board — not an aftermarket clone. OEM boards carry factory-programmed timing sequences and relay ratings precisely matched to your unit. Aftermarket boards frequently use off-spec relays and untested firmware, risking nuisance lockouts, unsafe ignition timing, or premature failure.
• Install Difficulty: 3/5 — Disconnect all power before servicing. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone camera (photograph all wiring harness connections before disconnecting). Transfer wiring harness connectors one-at-a-time to avoid miswiring. Clear any fault codes after installation and cycle the system through a full heating sequence to verify operation.
• Warranty: 1-year OEM manufacturer warranty. In stock — ships same business day from our warehouse.

Compatibility: Designed for the Carrier TCHC2550HECMRAY900. This board also fits a range of Carrier, Bryant, and Payne packaged and commercial units in the 48, 574, 580, 581, 582, 583, 588, and 589 model series. Always verify your existing board's part number against LH33WP002 before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you buy if you have any questions.