{"product_id":"carrier-ph3znb024000ab-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/230V for PH3ZNB024000AB","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/230V–24V for Model PH3ZNB024000AB\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PH3ZNB024000AB\u003c\/strong\u003e packaged unit. The transformer steps down line voltage (208\/230V) to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage safety circuits. When it fails, the entire control circuit goes dark — symptoms include a completely unresponsive thermostat, a system that won't respond to any call for heating or cooling, or a blown 3A control fuse that keeps returning without explanation.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/230V primary | 24V secondary | 40VA capacity | 50\/60 Hz | Class 2 control transformer | Direct OEM replacement for HT01BD207, HT01CN232, and 9076-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and potted to exact Carrier factory tolerances, ensuring steady 24V output under full VA load. Generic equivalents can sag under load, causing intermittent lockouts, nuisance tripping of safety circuits, or premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output post-install), and needle-nose pliers. Label all low-voltage wires before disconnecting. Verify incoming line voltage matches transformer primary tap.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse — order by 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Factory-matched for Carrier model \u003cstrong\u003ePH3ZNB024000AB\u003c\/strong\u003e packaged units. Also replaces obsolete part numbers HT01BD207, HT01CN232, and 9076-00. Always verify line voltage (208V or 230V) against your unit's data plate before ordering. Our fitment team is available to confirm compatibility prior to purchase.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641340842355,"sku":"CARRIE-PH3ZNB024000AB-TRANSFORMER-HT01BD209","price":87.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641340875123,"sku":"CARRIE-PH3ZNB024000AB-TRANSFORMER-HT01BD209-GEN","price":77.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_c5adc2fa-34ac-48c4-84fe-68dbc7d3353f.jpg?v=1775025413","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph3znb024000ab-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}