{"product_id":"tempstar-40va-transformer-for-teb12k34rta-208-240v-to-24v-ships-today","title":"Tempstar 40VA Transformer for TEB12K34RTA — 208\/240V to 24V | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis is the genuine OEM 40VA control transformer for the Tempstar TEB12K34RTA (OEM 1056899). It steps line voltage of 208\/240V down to the 24V needed to power the unit's thermostat, relays, and control circuit. The transformer is the power supply for the entire low-voltage system — when it fails or its internal fuse opens, nothing on the 24V side will operate even though the unit has line power. Typical failure symptoms are a dead thermostat display, relays that will not pull in, and a system that has power at the disconnect but does nothing when called. This OEM transformer is a direct electrical and mechanical match.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM Part Number\u003c\/td\u003e\n\u003ctd\u003e1056899 (TRANS 208\/240\u0026gt;24 40VA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eStep-Down Control Transformer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eTempstar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRating\u003c\/td\u003e\n\u003ctd\u003e40 VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Voltage\u003c\/td\u003e\n\u003ctd\u003e208\/240V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Voltage\u003c\/td\u003e\n\u003ctd\u003e24V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM Direct Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDirect-fit replacement for the Tempstar TEB12K34RTA. This 40VA 208\/240V-to-24V transformer is common across the ICP\/Tempstar\/Heil\/Comfortmaker TEB12K34 platform; verify your OEM part number matches 1056899 and your primary supply is 208\/240V.\u003c\/p\u003e\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power at the unit and breaker, verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the service panel to reach the control box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the primary and secondary wire connections before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unbolt the failed transformer and disconnect both windings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, wiring the 208\/240V leads to the primary and the 24V leads to the secondary per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm 24V across the secondary with a multimeter.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eNo 24V output measured at the secondary\u003c\/li\u003e\n\u003cli\u003eThermostat and controls completely dead with line power present\u003c\/li\u003e\n\u003cli\u003eRelays and contactor will not energize\u003c\/li\u003e\n\u003cli\u003eBurnt smell or visibly scorched transformer housing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\u003cp\u003eShips same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021643858291,"sku":"1053004-GEN","price":28.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048411578739,"sku":"1053004","price":37.63,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1053004_2db1b719-9aeb-4354-afa2-1608d15133ec.jpg?v=1782958565","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-40va-transformer-for-teb12k34rta-208-240v-to-24v-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}