{"product_id":"carrier-pf4mna031000aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 24V for PF4MNA031000AAAA — HT01CN241","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 24V for Model PF4MNA031000AAAA\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-specified replacement transformer (part# \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier PF4MNA031000AAAA\u003c\/strong\u003e fan coil unit. The transformer steps down line voltage (120V) to the 24V signal voltage that powers the entire control circuit — including the thermostat, relays, and control board. When this part fails, the system goes completely unresponsive: no thermostat call, no blower, no response whatsoever. A failed transformer is often misdiagnosed as a bad control board, so always test this component first.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 120V primary → 24V secondary | 40VA rated | Factory-matched impedance and insulation class | Direct OEM replacement for part# HT01CN241\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and tested to Carrier's exact VA and thermal ratings. Generic units may run hot under sustained load, tripping thermal protection and causing intermittent shutdowns — or failing prematurely.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or quick-connects. Photograph existing wiring before disconnecting. Confirm primary and secondary voltages with a multimeter after installation before restoring load.\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 as a direct fit for the Carrier \u003cstrong\u003ePF4MNA031000AAAA\u003c\/strong\u003e fan coil unit. Always verify line voltage and VA requirements on your unit's data plate before ordering. Not sure about fitment? Our HVAC parts specialists verify compatibility before you buy — no guesswork, no returns.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643305972083,"sku":"CARRIE-PF4MNA031000AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643306004851,"sku":"CARRIE-PF4MNA031000AAAA-TRANSFORMER-HT01CN241-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-HT01CN241_2578b3c2-d958-4f1e-933b-2fe641b4e81c.jpg?v=1782942656","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pf4mna031000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}