{"product_id":"carrier-lc948lcfsrmt600-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for LC948LCFSRMT600","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model LC948LCFSRMT600\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier LC948LCFSRMT600\u003c\/strong\u003e system. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board logic. When this component fails, the entire control circuit goes dead: the thermostat goes blank, the system won't respond to calls for heating or cooling, and nothing powers on despite line voltage being present at the unit.\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 | Direct drop-in replacement with matching mounting footprint and wire leads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD702 transformer is wound to exact factory VA and voltage tolerances, ensuring stable 24V output under full control circuit load. Generic transformers often run under-rated VA, causing voltage sag that can damage control boards and contactors over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after install. Label or photograph all low-voltage wire connections before disconnecting the old transformer.\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 for the Carrier \u003cstrong\u003eLC948LCFSRMT600\u003c\/strong\u003e. Always verify the 40VA rating and 120V\/24V configuration against your unit's data plate and wiring diagram before ordering. If you need help confirming fitment, our HVAC parts specialists are available to verify compatibility before you buy — same-day shipping means you're back up and running fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909290185075,"sku":"CARRIE-LC948LCFSRMT600-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909290217843,"sku":"CARRIE-LC948LCFSRMT600-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_5512a8f5-9abc-42b6-a650-6d1cb98f813c.jpg?v=1782941738","url":"https:\/\/nationalhvacparts.com\/products\/carrier-lc948lcfsrmt600-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}