{"product_id":"tempstar-40va-transformer-for-teb09k34rta-208-240v-to-24v-ships-today","title":"Tempstar 40VA Transformer for TEB09K34RTA — 208\/240V to 24V | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis genuine OEM control transformer, part 1056899, steps the Tempstar TEB09K34RTA's 208\/240V line voltage down to the 24V needed to power the thermostat, relays, and contactor coil. Rated at 40VA, it supplies the full low-voltage control circuit. This listing also covers the unit's 24V control relays — part 1053004 (relay 24V) and part 1060940 (relay 24V DPST) — which switch the loads the transformer energizes. A failed transformer leaves the entire unit dead with no 24V control power, while a failed relay prevents specific functions from starting even when the transformer is healthy.\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\u003ePrimary Part Number\u003c\/td\u003e\n\u003ctd\u003e1056899 (Transformer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Parts\u003c\/td\u003e\n\u003ctd\u003e1053004 (Relay 24V), 1060940 (Relay 24V DPST)\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\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eTempstar (ICP \/ Heil)\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\u003eRating\u003c\/td\u003e\n\u003ctd\u003e40VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eFactory-correct transformer and relay group for the Tempstar TEB09K34RTA. Confirm the part numbers and 208\/240V primary against your unit rating plate before ordering to guarantee fitment.\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 confirm zero voltage with a multimeter before servicing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the service panel to reach the control box and transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph all primary (line) and secondary (24V) wire connections before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unbolt the old transformer and any failed relay, then disconnect the leads, noting terminal positions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer and relay, reconnecting primary to line and secondary to the 24V control circuit per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and verify 24V across the transformer secondary, then confirm the unit energizes on a call.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eNo 24V at the secondary — unit completely unresponsive\u003c\/li\u003e\n\u003cli\u003eRepeatedly blown low-voltage fuse or tripped control circuit\u003c\/li\u003e\n\u003cli\u003eTransformer is hot, buzzing, or shows burn marks\u003c\/li\u003e\n\u003cli\u003eRelay fails to click or its contacts are pitted or welded\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":63021644579187,"sku":"1053004-GEN","price":32.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048411218291,"sku":"1053004","price":41.6,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1053004_4a02f92b-73b9-40c0-a773-a6112c4dd556.jpg?v=1782958551","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-40va-transformer-for-teb09k34rta-208-240v-to-24v-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}