{"product_id":"carrier-m150039mx41011524-transformer-h306bq","title":"OEM Carrier Transformer 40VA 120V\/24V for M150039MX41011524","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model M150039MX41011524\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD118\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier M150039MX41011524\u003c\/strong\u003e. Its job is to step down line voltage from 120V to the 24V AC signal that powers your thermostat, control board, and all low-voltage safety circuits. When this transformer fails, the entire control circuit loses power — your thermostat goes blank, the system won't respond to calls for heating or cooling, and nothing works. A faulty transformer is often misdiagnosed as a failed control board, so always verify 24V output at the transformer secondary before replacing more expensive components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01BD118 | Factory-matched output tolerance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound and rated to Carrier's exact factory specifications. Generic transformers often use lower-grade core laminations that run hotter, reducing lifespan and risking nuisance tripping of the internal thermal fuse under normal load conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph or label all low-voltage wire connections before disconnecting. Reconnect wires to matching terminals and restore power to confirm 24V output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. 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 as a direct OEM replacement for Carrier model \u003cstrong\u003eM150039MX41011524\u003c\/strong\u003e. Verify your existing transformer's primary\/secondary voltages and VA rating on the data plate before ordering to ensure a proper match. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you order — reach out before placing your order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909287203187,"sku":"CARRIE-M150039MX41011524-TRANSFORMER-HT01BD118","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909287235955,"sku":"CARRIE-M150039MX41011524-TRANSFORMER-HT01BD118-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-HT01BD118_9064d354-3665-425f-90fc-43bfc6e0bd09.jpg?v=1782941743","url":"https:\/\/nationalhvacparts.com\/products\/carrier-m150039mx41011524-transformer-h306bq","provider":"National HVAC Parts","version":"1.0","type":"link"}