{"product_id":"tempstar-40va-208-240v-to-24v-transformer-for-teb09k25rta-with-relays-ships-today","title":"Tempstar 40VA 208\/240V-to-24V Transformer for TEB09K25RTA – With Relays | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM control package powers the low-voltage circuit of the Tempstar TEB09K25RTA. The core is a 40VA control transformer (part 1056899) that steps 208\/240V line voltage down to 24V to run the thermostat, relays, and contactor coils. It is paired with the unit's 24V relays — a standard 24V relay (part 1053004) and a 24V DPST relay (part 1060940) — that switch the fan and compressor loads on command. A failed transformer leaves the entire control circuit dead: no 24V means the unit won't respond at all, even though line power is present. Symptoms include a humming or burnt transformer, blown control fuse, or no low-voltage output at the secondary terminals. Worn relays cause stuck or unresponsive loads.\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\u003ePart Numbers\u003c\/td\u003e\n\u003ctd\u003e1056899 (40VA Transformer), 1053004 (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 with Relays\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\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\u003eRelay Contacts\u003c\/td\u003e\n\u003ctd\u003eSPST \/ DPST, 24V coil\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\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDirect OEM replacement for the Tempstar TEB09K25RTA control circuit. The 40VA 208\/240V-to-24V transformer and 24V relay platform are shared across ICP, Heil, Comfortmaker, and Tempstar units using the same low-voltage scheme. Verify primary voltage, VA rating, and the existing part numbers 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 unit disconnect and verify zero voltage at the transformer primary 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 leads and every relay terminal before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e – Unscrew the transformer from its mount, disconnect the primary and secondary leads, and unplug the relays.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e – Mount the new transformer, confirm the primary tap matches your supply voltage, reconnect secondary leads, and seat the new relays per your photos.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e – Restore power, measure 24V at the secondary, call for operation, and verify the relays energize and the loads respond.\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 output at the transformer secondary terminals\u003c\/li\u003e\n\u003cli\u003eUnit completely unresponsive despite present line voltage\u003c\/li\u003e\n\u003cli\u003eHumming, overheating, or visibly burnt transformer\u003c\/li\u003e\n\u003cli\u003eRepeated blown control fuses or stuck\/chattering relays\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":63021644710259,"sku":"1053004-GEN","price":32.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048400863603,"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_1e439dba-bf31-4b86-a74d-3466dda51f7b.jpg?v=1782958175","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-40va-208-240v-to-24v-transformer-for-teb09k25rta-with-relays-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}