OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model TCHC2550HECMRLY501

This is the genuine OEM Direct Spark Ignition (DSI) Control Board for the Carrier TCHC2550HECMRLY501, manufactured to exact factory specifications under part number LH33WP002. The DSI control board serves as the brain of the heating system, orchestrating the entire ignition sequence — energizing the inducer motor, proving draft pressure, firing the direct spark igniter, confirming flame establishment, and managing all safety lockout logic. When this board fails, symptoms typically include a no-heat condition, repeated ignition lockouts, failure to prove flame even with a healthy flame sensor, or erratic cycling that cannot be traced to any single downstream component.

• Specs: Direct Spark Ignition (DSI) control board | 460V application | OEM part number LH33WP002 | Replaces legacy part LH33WP002A | Factory-matched timing and lockout sequences
• OEM vs Generic: This is a genuine Carrier OEM board — not an aftermarket clone. OEM boards preserve factory-programmed ignition timing, trial-for-ignition duration, and safety lockout parameters. Aftermarket boards frequently ship with mismatched firmware that causes nuisance lockouts, voided equipment warranties, and potential liability exposure on commercial installs.
• Install difficulty: 3/5 — Disconnect power at the disconnect and verify zero voltage before handling. Tools needed: 1/4" and 5/16" nut drivers, a phone camera to photograph all wiring harness connections before removal, and a multimeter for post-install verification. Label every connector. A wiring diagram is typically affixed inside the unit's blower compartment door.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before cutoff. Free shipping included.

Compatibility: Engineered specifically for the Carrier TCHC2550HECMRLY501. This board is also used across a wide range of Carrier, Bryant, and Payne packaged and split heating systems in the 48, 574, 580, 581, 582, 583, 588, and 589 model series — always confirm your unit's data plate part number before ordering. Our fitment team is available to verify compatibility before you buy.