{"product_id":"carrier-tchc2550hecmray900-control-board-cyc67o","title":"OEM Carrier DSI Control Board LH33WP002 for TCHC2550HECMRAY900","description":"\u003ch1\u003eOEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model TCHC2550HECMRAY900\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 TCHC2550HECMRAY900\u003c\/strong\u003e 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.\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Direct Spark Ignition (DSI) control board | 460V application | OEM part number LH33WP002 | Replaces superseded part LH33WP002A | Factory-matched firmware and relay logic for Carrier equipment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs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 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 3\/5\u003c\/strong\u003e — 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty. In stock — ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the \u003cstrong\u003eCarrier TCHC2550HECMRAY900\u003c\/strong\u003e. 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.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640273457523,"sku":"CARRIE-TCHC2550HECMRAY900-CONTROL_BOARD-LH33WP002","price":500.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640273490291,"sku":"CARRIE-TCHC2550HECMRAY900-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_eb8ffcc2-7601-434d-8c96-88d9dc9b2d03.jpg?v=1775027845","url":"https:\/\/nationalhvacparts.com\/products\/carrier-tchc2550hecmray900-control-board-cyc67o","provider":"National HVAC Parts","version":"1.0","type":"link"}