{"product_id":"carrier-m150039mx41011520-transformer-h306bq","title":"OEM Carrier Transformer 40VA 120V-24V for M150039MX41011520","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model M150039MX41011520\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part# \u003cstrong\u003eHT01BD118\u003c\/strong\u003e) for the Carrier \u003cstrong\u003eM150039MX41011520\u003c\/strong\u003e. The transformer steps down line voltage (120V) to the 24V control circuit voltage that powers your thermostat, contactor coil, and all low-voltage control components. When this part fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any commands, and nothing turns on. It is often the first part to diagnose when the unit has power at the disconnect but zero response at the thermostat.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory-matched OEM part number HT01BD118 | Designed for Carrier control circuit applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact factory VA and voltage tolerances, ensuring stable 24V output under full load. Undersized or off-tolerance generic transformers can overheat, trip their internal fuse, or deliver insufficient voltage to hold contactors closed — causing intermittent lockouts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire stripper, multimeter to verify 24V output after installation. Label all wire connections before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. 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 the direct OEM replacement for Carrier model \u003cstrong\u003eM150039MX41011520\u003c\/strong\u003e. Always verify input voltage (120V) and VA rating on your unit's data plate before ordering to confirm fitment. Our parts specialists are available to verify compatibility before you buy — order with confidence and get your system back online today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909287530867,"sku":"CARRIE-M150039MX41011520-TRANSFORMER-HT01BD118","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909287563635,"sku":"CARRIE-M150039MX41011520-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.jpg?v=1782939947","url":"https:\/\/nationalhvacparts.com\/products\/carrier-m150039mx41011520-transformer-h306bq","provider":"National HVAC Parts","version":"1.0","type":"link"}