{"product_id":"tempstar-40va-transformer-for-t8mpv050b12a1-115v-to-24v-ships-today","title":"Tempstar 40VA Transformer for T8MPV050B12A1 — 115V to 24V | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM control transformer (part #1012722) converts 115-volt line power into the 24-volt control voltage that runs the low-voltage circuit on your Tempstar T8MPV050B12A1 furnace. Rated at 40VA, it supplies the thermostat, control board, gas valve, and relays. When the transformer fails, the control circuit loses power entirely: the thermostat goes blank, the furnace ignores heat and cool calls, and the board's low-voltage fuse may blow repeatedly. Buzzing, overheating, or a burnt smell at the transformer are classic warning signs. This genuine OEM Class 2 transformer matches the exact voltage, VA rating, and mounting of your unit so the control circuit comes right back to life.\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\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e1012722\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\u003e115V\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\u003ctr\u003e\n\u003ctd\u003eClass\u003c\/td\u003e\n\u003ctd\u003eClass 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eT8MPV050B12A1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eMade for the Tempstar T8MPV050B12A1 gas furnace and used across ICP-family equipment (Heil, Comfortmaker, Arcoaire) that requires a 115V-to-24V 40VA control transformer. Verify your existing transformer is 115V primary \/ 24V secondary \/ 40VA before installing.\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 furnace switch and breaker, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the furnace control\/blower compartment service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the primary (line) and secondary (24V) wiring before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the leads, remove the mounting screws, and lift out the failed transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer and reconnect primary and secondary leads exactly as photographed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, confirm 24VAC across the secondary, and verify the furnace responds to a thermostat call.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBlank thermostat with no furnace response\u003c\/li\u003e\n\u003cli\u003eRepeatedly blown low-voltage control fuse\u003c\/li\u003e\n\u003cli\u003eBuzzing or burnt-electrical smell at the transformer\u003c\/li\u003e\n\u003cli\u003eNo 24VAC reading at the secondary terminals\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":63021701792115,"sku":"1012722-GEN","price":33.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048405647731,"sku":"1012722","price":42.9,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1012722_5b88c40b-dff4-43a2-aadb-61586a6590c8.jpg?v=1782958338","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-40va-transformer-for-t8mpv050b12a1-115v-to-24v-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}