{"product_id":"carrier-ph3znb036000aa-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/240V–24V for PH3ZNB036000AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V — Model PH3ZNB036000AA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the \u003cstrong\u003eCarrier PH3ZNB036000AA\u003c\/strong\u003e packaged unit. The transformer steps down 208\/240V line voltage to the 24V signal that powers your thermostat, control board, and every low-voltage relay in the system. When it fails — due to a short, voltage spike, or age — the entire control circuit goes dark: no thermostat response, no staging, nothing works. Replacing it with the correct OEM part restores full system function immediately.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/240V Primary | 24V Secondary | 40VA | 50\/60 Hz | Replaces HT01BD207, HT01CN232, 4000A46E07AE28, 9076-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM transformer, factory-wound to exact VA and voltage tolerances. Generic transformers risk undervoltage on heavy control loads, causing nuisance lockouts and shortened board life.\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 touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter (confirm 0V before touching), wire nuts or spade connectors. Photograph all wiring before disconnecting. The transformer typically mounts with one screw to the cabinet panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM fit for Carrier model \u003cstrong\u003ePH3ZNB036000AA\u003c\/strong\u003e. Also cross-references with Bryant and Payne units sharing the same transformer specification. Always confirm your unit's control voltage and VA rating on the equipment data plate before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy — call or chat today and get your unit back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641338155379,"sku":"CARRIE-PH3ZNB036000AA-TRANSFORMER-HT01BD209","price":50.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641338188147,"sku":"CARRIE-PH3ZNB036000AA-TRANSFORMER-HT01BD209-GEN","price":44.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_1a0a2ee9-e178-48b8-b25c-a75313c078b7.jpg?v=1775025634","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph3znb036000aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}