OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model TCHC2550HECMRMY501

This is the genuine OEM Carrier Direct Spark Ignition (DSI) Control Board, part number LH33WP002, factory-specified for the Carrier TCHC2550HECMRMY501. The DSI control board serves as the brain of the heating system — it sequences the inducer motor, manages gas valve timing, fires the direct spark igniter, and continuously monitors the flame sensor signal. When this board fails, you will typically experience a complete no-heat condition, repeated ignition lockouts, fault codes on the system, or a furnace that attempts ignition and immediately shuts down without establishing a flame.

• Specs: Direct Spark Ignition (DSI) control board | 460V application | Replaces LH33WP002A | Factory-programmed timing and lockout sequences for Carrier equipment
• OEM vs Generic: This is a genuine Carrier OEM board with factory-calibrated ignition timing, lockout delay thresholds, and safety trip logic. Aftermarket boards may carry incompatible firmware or imprecise flame-sensing thresholds, risking nuisance lockouts or unsafe ignition behavior.
• Install Difficulty: 3/5 — Shut off gas supply and 120V power before servicing. Photograph all wiring harness connections prior to disconnecting. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone camera for documentation. Clear any fault codes after installation and verify ignition sequence through a full call-for-heat cycle.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for Carrier model TCHC2550HECMRMY501. Also fits select Carrier, Bryant, and Payne models in the 48, 574, 580, 581, 582, 583, 588, and 589 series — verify your unit's data plate and existing part number before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy.