{"product_id":"carrier-py3pna030040nb-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/240V for PY3PNA030040NB","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD209 for Model PY3PNA030040NB\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3PNA030040NB\u003c\/strong\u003e packaged unit. The transformer steps down the 208\/240V line voltage to the 24V signal required to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this part fails, the system goes completely unresponsive: no thermostat communication, no staging, no heat or cool. A failed transformer is one of the most common causes of a fully dead HVAC system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/240V primary input | 24V secondary output | 40VA power rating | 50\/60 Hz | Factory-matched OEM tolerances for the PY3PNA030040NB control circuit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD209 is wound to Carrier's exact VA rating and insulation class. Generic transformers frequently run under-rated VA, leading to overheating and premature failure under full control-load conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — De-energize and lock out power before starting. Tools needed: multimeter, flathead\/Phillips screwdrivers, wire stripper, needle-nose pliers. Photograph or label all 24V wiring before disconnecting terminals. Verify primary voltage tap matches your supply voltage before powering up.\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 Designed for the Carrier \u003cstrong\u003ePY3PNA030040NB\u003c\/strong\u003e packaged unit. Verify your unit's supply voltage (208V or 240V) against the transformer's primary tap before installation. Cross-references include HT01CN232 and HT01CN233. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order — ships same day.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640396566899,"sku":"CARRIE-PY3PNA030040NB-TRANSFORMER-HT01BD209","price":55.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640396599667,"sku":"CARRIE-PY3PNA030040NB-TRANSFORMER-HT01BD209-GEN","price":48.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_2d1e6459-d64f-47f6-b62b-c586ee8285b2.jpg?v=1775025574","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3pna030040nb-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}