{"product_id":"tempstar-40va-transformer-208-240v-to-24v-for-teb12k50rta-oem-ships-today","title":"Tempstar 40VA Transformer 208\/240V to 24V for TEB12K50RTA — OEM | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis is the OEM 40VA control transformer for the Tempstar TEB12K50RTA, stepping 208\/240V line voltage down to 24V to power the unit's control circuit, relays, and thermostat (OEM 1056899, TRANS 208\/240\u0026gt;24 40VA). When a transformer fails — usually from a shorted control wire or an overloaded 24V circuit — the entire low-voltage system goes dead: no thermostat response, no relay pull-in, and no operation despite line power being present. This listing covers the transformer and its companion control relays (OEM 1053004, RELAY 24V; OEM 1060940, RELAY 24V DPST) used in this model's control package.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\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\u003eTransformer Part Number\u003c\/td\u003e\n\u003ctd\u003e1056899\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\u003eType\u003c\/td\u003e\n\u003ctd\u003eControl transformer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelays Included\u003c\/td\u003e\n\u003ctd\u003e1053004 (24V), 1060940 (24V DPST)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eTempstar (ICP \/ Heil)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM exact replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDesigned for the Tempstar TEB12K50RTA. The 40VA 208\/240V-to-24V transformer is shared across many ICP-family (Heil, Comfortmaker, Tempstar) units, but verify part number 1056899 and your unit's primary voltage before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power at the breaker; verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the control\/electrical panel to expose the transformer and relays.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph all primary (line) and secondary (24V) leads before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unbolt the transformer from the bracket and disconnect all leads; note the 208 vs 240 primary tap if applicable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, match the primary tap to your supply voltage, and reconnect per your photos.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm ~24V across the secondary and proper relay pull-in.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNo 24V at the control board or thermostat with line power present.\u003c\/li\u003e\n\u003cli\u003eTripped or blown low-voltage fuse that recurs.\u003c\/li\u003e\n\u003cli\u003eBurnt smell or visibly scorched transformer windings.\u003c\/li\u003e\n\u003cli\u003eRelays fail to energize and the unit won't start.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\n\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":63021643727219,"sku":"1053004-GEN","price":28.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048401584499,"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_8d90b3b0-0b45-440b-8750-e67ff970f3c1.jpg?v=1782958203","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-40va-transformer-208-240v-to-24v-for-teb12k50rta-oem-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}