{"product_id":"carrier-control-board-hb1ajx042000aaaa","title":"OEM Carrier Control Board Replacement for Model HB1AJX042000AAAA","description":"\u003cdiv\u003e\n\u003ch1\u003eOEM Carrier Control Board Replacement for Model HB1AJX042000AAAA\u003c\/h1\u003e\n\u003cp\u003eThis genuine OEM Carrier control board is the command center of your HB1AJX042000AAAA unit, coordinating compressor calls, outdoor fan operation, defrost cycles, and built-in safety lockouts using inputs from the thermostat and onboard sensors. Manufactured to precise Carrier specifications, it provides the correct relay configuration, firmware, and harness connectors for a direct factory-matched replacement—no adapters or rewiring required. Telltale signs of a failing board include a unit that won't respond to a cooling or heating call, stays stuck in defrost, cycles erratically, or displays diagnostic fault codes on the LED. This is a moderate repair: disconnect power at the disconnect, photograph all wiring, move each harness to the new board one connection at a time, and match the DIP switch settings to the original. Expect 30 to 45 minutes for most installs. Run a complete cycle to confirm proper operation before sealing the cabinet. In stock and ships same-day on orders placed before 3PM CST, keeping costly downtime to a minimum with reliable genuine Carrier electronics.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis part is compatible with Carrier model HB1AJX042000AAAA.\u003c\/p\u003e\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eSame-day shipping before 3 PM CST. 30-day returns on uninstalled parts.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Carrier","offers":[{"title":"Default Title","offer_id":62942658462067,"sku":"carrier-control-board-hb1ajx042000aaaa","price":229.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-hb1ajx042000aaaa.jpg?v=1781468265","url":"https:\/\/nationalhvacparts.com\/products\/carrier-control-board-hb1ajx042000aaaa","provider":"National HVAC Parts","version":"1.0","type":"link"}