{"product_id":"carrier-pg8maa042090adja-transformer-h2usbz","title":"OEM Carrier Furnace Transformer 120V–24V 40VA for PG8MAA042090ADJA","description":"\u003ch1\u003eOEM Carrier Furnace Transformer 120V–24V 40VA for Model PG8MAA042090ADJA\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer is the factory-authorized replacement for the \u003cstrong\u003eCarrier PG8MAA042090ADJA\u003c\/strong\u003e gas furnace, cross-referenced under part number \u003cstrong\u003eHT01BC116\u003c\/strong\u003e (superseded by HT680054). The transformer converts 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, gas valve, and control board relay coils. When the transformer fails, the furnace goes completely unresponsive: no thermostat call, no ignition sequence, and no error codes because the board itself loses power. A simple multimeter check between the C and R terminals on the control board will confirm whether your transformer is at fault.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary Voltage: 120V AC | Secondary Voltage: 24V AC | VA Rating: 40VA | Frequency: 60 Hz | Phase: Single | Mounting: Foot mount | Connection: Wire leads with insulated female quick-connect terminals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a factory-authorized OEM unit shipped in a Carrier\/Bryant branded box. Generic transformers often use lower-grade core laminations, running hotter and failing sooner — especially in furnaces with marginal low-voltage wiring that already stresses the VA rating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph or label all wire connections before removing the old transformer. Match wire leads carefully: primary (120V) to line voltage terminals, secondary (24V) to R and C on the control board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty. In stock — ships same business day from our warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for Carrier model \u003cstrong\u003ePG8MAA042090ADJA\u003c\/strong\u003e gas furnace. Also replaces legacy part numbers HT01BC116, HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, and additional cross-references — verify your data plate before ordering. Need fitment confirmation? Our HVAC parts team checks compatibility before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643034947955,"sku":"CARRIE-PG8MAA042090ADJA-TRANSFORMER-HT01BC116","price":51.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643034980723,"sku":"CARRIE-PG8MAA042090ADJA-TRANSFORMER-HT01BC116-GEN","price":45.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BC116_fac4dc73-af16-4062-aa6e-f384bf0a7b32.jpg?v=1775031583","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pg8maa042090adja-transformer-h2usbz","provider":"National HVAC Parts","version":"1.0","type":"link"}