{"product_id":"tempstar-40va-transformer-for-teb15k25rta-208-240v-to-24v-with-relays-ships-today","title":"Tempstar 40VA Transformer for TEB15K25RTA — 208\/240V to 24V with Relays | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis is a genuine OEM control package for the Tempstar TEB15K25RTA, built around a 40VA step-down transformer (part 1056899) that converts 208\/240V line voltage to the 24V needed by the control circuit, plus two 24V control relays — a SPST relay (1053004) and a DPST relay (1060940). The transformer powers the thermostat and control board; if it fails, the entire low-voltage circuit goes dead and the unit will not respond to any call for heat or cool. The relays handle switching of the unit's loads. A blown transformer commonly results from a control-circuit short or sustained overload.\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 Numbers\u003c\/td\u003e\n\u003ctd\u003e1056899 (Transformer), 1053004 (Relay SPST), 1060940 (Relay DPST)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eStep-Down Transformer with Control Relays\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eTempstar (Heil \/ ICP)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRating\u003c\/td\u003e\n\u003ctd\u003e40VA\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\u003eFit\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\u003eEngineered for the Tempstar \/ Heil \/ ICP TEB15K25RTA and units using the same 40VA control transformer and relays. Confirm the OEM part numbers above against your existing components before ordering.\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 breaker and 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 compartment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the transformer and relay wiring before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the primary and secondary leads, unbolt the transformer, and unclip the relays from their mounts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer and relays, then reconnect every lead per your photo, matching primary to line voltage and secondary to the 24V circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm 24V at the secondary and correct relay operation.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eNo 24V control power and a completely unresponsive unit\u003c\/li\u003e\n\u003cli\u003eRepeatedly blown low-voltage fuse\u003c\/li\u003e\n\u003cli\u003eBuzzing, overheated, or burnt-smelling transformer\u003c\/li\u003e\n\u003cli\u003eRelays that chatter, stick, or fail to switch\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":63021643071859,"sku":"1053004-GEN","price":34.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048411840883,"sku":"1053004","price":44.2,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1053004_ce261da3-2911-4b7c-b857-7b6c86799031.jpg?v=1782958574","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-40va-transformer-for-teb15k25rta-208-240v-to-24v-with-relays-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}