{"product_id":"carrier-tchc2550hecmrsy501-control-board-cyc67o","title":"OEM Carrier DSI Control Board LH33WP002 — TCHC2550HECMRSY501","description":"\u003ch1\u003eOEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model TCHC2550HECMRSY501\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM Carrier Direct Spark Ignition (DSI) Control Board, part number \u003cstrong\u003eLH33WP002\u003c\/strong\u003e, factory-specified for the \u003cstrong\u003eCarrier TCHC2550HECMRSY501\u003c\/strong\u003e. 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.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Direct Spark Ignition (DSI) control board | 460V application | Replaces superseded part LH33WP002A | Factory-matched logic and timing sequences for safe, code-compliant operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for Carrier model \u003cstrong\u003eTCHC2550HECMRSY501\u003c\/strong\u003e. 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.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640269820275,"sku":"CARRIE-TCHC2550HECMRSY501-CONTROL_BOARD-LH33WP002","price":500.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640269853043,"sku":"CARRIE-TCHC2550HECMRSY501-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_94bbd884-8f8d-495d-b14a-f72c5edb2931.jpg?v=1775027863","url":"https:\/\/nationalhvacparts.com\/products\/carrier-tchc2550hecmrsy501-control-board-cyc67o","provider":"National HVAC Parts","version":"1.0","type":"link"}