{"product_id":"carrier-c50a405051-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A405051","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C50A405051\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified 40VA step-down transformer for the \u003cstrong\u003eCarrier C50A405051\u003c\/strong\u003e commercial rooftop unit. The transformer converts 120V primary power to the 24V AC signal that powers the entire control circuit — including the thermostat, contactor coils, gas valve, and control board. When this component fails, the system goes completely unresponsive: the thermostat goes blank, the unit won't call for heating or cooling, and no safety or operating sequence can initiate. It's often the first component to diagnose when nothing works.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Class 2 control transformer | Factory-matched impedance for stable control voltage under load\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit (HT01BD236) meets Carrier's exact VA rating and insulation class. Generic transformers frequently deliver unstable secondary voltage under load, causing intermittent lockouts, nuisance tripping of fuses, and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Verify fuse condition on the 24V secondary side before installing — a shorted control component will immediately blow the new transformer. Label all wiring before disconnecting.\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 for the Carrier \u003cstrong\u003eC50A405051\u003c\/strong\u003e commercial packaged rooftop unit. Always verify primary voltage (120V) and VA rating on your unit's wiring diagram or data plate before ordering. If your system uses a 208\/240V primary, do not use this transformer. Our team is available to verify fitment before you order — same-day shipping available on all in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909680386419,"sku":"CARRIE-C50A405051-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909680419187,"sku":"CARRIE-C50A405051-TRANSFORMER-HT01BD236-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-HT01BD236_c3f735fb-eb82-41c5-90aa-03da312db31c.jpg?v=1782940534","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a405051-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}