{"product_id":"carrier-lc750lccmray600-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for LC750LCCMRAY600","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model LC750LCCMRAY600\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-replacement control transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier LC750LCCMRAY600\u003c\/strong\u003e. The transformer steps line voltage (120V) down to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this part fails, nothing in the system responds: the thermostat goes blank, the system won't call for heat or cooling, and diagnostics show no 24V signal at the control board. It is often the first component to check when the entire system appears completely dead.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory OEM part number HT01BD702 | Engineered to Carrier factory tolerances for stable, consistent low-voltage output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD702 transformer delivers a steady, regulated 24V output matched to Carrier's control board requirements. Generic transformers may produce voltage fluctuations that cause nuisance lockouts, contactor chatter, or premature control board failure — making OEM the only recommended choice for long-term reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph all wiring connections before disconnecting. Confirm 24V output with a multimeter after installation before restoring full system power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as the direct OEM replacement for Carrier model \u003cstrong\u003eLC750LCCMRAY600\u003c\/strong\u003e. Verify your existing transformer's VA rating and primary\/secondary voltages against your unit's data plate prior to ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909291200883,"sku":"CARRIE-LC750LCCMRAY600-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909291233651,"sku":"CARRIE-LC750LCCMRAY600-TRANSFORMER-HT01BD702-GEN","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-HT01BD702_82e3254e-733e-4884-9003-e85c86a3be60.jpg?v=1782941726","url":"https:\/\/nationalhvacparts.com\/products\/carrier-lc750lccmray600-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}