{"product_id":"carrier-tchc2550hecmrly501-control-board-cyc67o","title":"OEM Carrier DSI Control Board LH33WP002 for TCHC2550HECMRLY501","description":"\u003ch1\u003eOEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model TCHC2550HECMRLY501\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM Direct Spark Ignition (DSI) Control Board for the \u003cstrong\u003eCarrier TCHC2550HECMRLY501\u003c\/strong\u003e, manufactured to exact factory specifications under part number \u003cstrong\u003eLH33WP002\u003c\/strong\u003e. 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.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Direct Spark Ignition (DSI) control board | 460V application | OEM part number LH33WP002 | Replaces legacy part LH33WP002A | Factory-matched timing and lockout sequences\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before cutoff. Free shipping included.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003eTCHC2550HECMRLY501\u003c\/strong\u003e. 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.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640272867699,"sku":"CARRIE-TCHC2550HECMRLY501-CONTROL_BOARD-LH33WP002","price":500.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640272900467,"sku":"CARRIE-TCHC2550HECMRLY501-CONTROL_BOARD-LH33WP002-GEN","price":440.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-LH33WP002_6a5acb46-b777-470a-844d-6cfea5763f7f.jpg?v=1775027848","url":"https:\/\/nationalhvacparts.com\/products\/carrier-tchc2550hecmrly501-control-board-cyc67o","provider":"National HVAC Parts","version":"1.0","type":"link"}