{"product_id":"carrier-c4850c48zn040500-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C48ZN040500 — Ships Today","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C48ZN040500\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C48ZN040500\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, the result is total system unresponsiveness: a blank thermostat, no contactor pull-in, and a unit that won't start regardless of demand. It is one of the most commonly overlooked failure points in a no-heat, no-cool diagnostic.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | Class 2 control circuit | Compatible with OEM wiring harness on C4850C48ZN040500\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine Carrier OEM part (HT01BD236), manufactured to exact VA and voltage tolerances. Generic transformers may be undersized or use inferior core laminations, causing overheating, premature failure, or nuisance tripped fuses on the control circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output post-install). Label all low-voltage wires before disconnecting. Typical replacement time: 20–30 minutes.\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 HVAC parts warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for Carrier model \u003cstrong\u003eC4850C48ZN040500\u003c\/strong\u003e packaged units. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering to confirm an exact match. Our parts specialists are available to verify fitment — contact us before you order if you have any questions. Order today and most shipments arrive within 1–2 business days.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909858775411,"sku":"CARRIE-C4850C48ZN040500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909858808179,"sku":"CARRIE-C4850C48ZN040500-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_19a88e83-9152-4381-91c2-6bb9f010c149.jpg?v=1782938821","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48zn040500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}