{"product_id":"carrier-pf4mna036t00aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V→24V for PF4MNA036T00AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V→24V for Model PF4MNA036T00AAAA\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier PF4MNA036T00AAAA\u003c\/strong\u003e fan coil air handler. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, control board, and zone valves. When this transformer fails, you'll typically experience a completely unresponsive thermostat, a blank display, or a system that won't respond to any call for heating or cooling, even when the main power is confirmed on.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory-matched OEM tolerances | Replaces OEM part number HT01CN241\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and rated to exact factory specifications, ensuring stable 24V output under full load. Generic units can underperform under peak demand, causing nuisance lockouts and intermittent control board faults.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output after install), wire nuts or spade connectors. Always label all control wires 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 Engineered specifically for the \u003cstrong\u003eCarrier PF4MNA036T00AAAA\u003c\/strong\u003e fan coil air handler. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643299156339,"sku":"CARRIE-PF4MNA036T00AAAA-TRANSFORMER-HT01CN241","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643299189107,"sku":"CARRIE-PF4MNA036T00AAAA-TRANSFORMER-HT01CN241-GEN","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01CN241_5e0a8a5b-bc21-4e3a-804e-82afb0dcefdd.jpg?v=1775041455","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pf4mna036t00aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}