{"product_id":"carrier-pf4mna025000aaaa-transformer-h3hwwy","title":"OEM Carrier 24V Control Transformer 40VA for PF4MNA025000AAAA","description":"\u003ch1\u003eOEM Carrier 24V Control Transformer 40VA for Model PF4MNA025000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PF4MNA025000AAAA\u003c\/strong\u003e air handler. The transformer steps down 120V primary line voltage to a safe 24V secondary signal used to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this part fails, absolutely nothing responds: no fan, no heat, no cooling. The whole system appears dead even though line voltage is present.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 120V primary | 24V secondary | 40VA rating | Factory OEM construction | Replaces HT01CN241 directly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers use factory-wound coils rated to exact VA tolerances. Generic units are often under-rated at sustained loads, leading to premature thermal cutout trips and repeat failures — especially in systems with multiple 24V accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the breaker and verify with a meter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Photograph all wiring before disconnecting the old unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before the cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the \u003cstrong\u003eCarrier PF4MNA025000AAAA\u003c\/strong\u003e air handler. Always verify your unit's data plate voltage and VA requirements before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643314033011,"sku":"CARRIE-PF4MNA025000AAAA-TRANSFORMER-HT01CN241","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643314065779,"sku":"CARRIE-PF4MNA025000AAAA-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_69fb22fc-253d-45ce-8120-9dec310f82c7.jpg?v=1775015752","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pf4mna025000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}