{"product_id":"tempstar-transformer-for-t9mpd050f12a2-40va-115v-to-24v-ships-today","title":"Tempstar Transformer for T9MPD050F12A2 – 40VA 115V to 24V | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM 40VA control transformer (part #1012722) steps the incoming 115V line voltage down to the 24V control voltage required by your Tempstar T9MPD050F12A2 gas furnace. The transformer powers the thermostat circuit, gas valve, ignition control board, and relays. When a control transformer fails, the entire low-voltage system goes dead: the thermostat screen may go blank, the furnace will not respond to a call for heat, and you may find a blown fuse on the control board. A buzzing transformer, scorched windings, or zero volts on the 24V secondary terminals all indicate replacement is needed. This is a direct-fit factory replacement rated at 40VA with a 115V primary and 24V secondary.\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\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\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\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM\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 T9MPD050F12A2 gas furnace and shared across many ICP\/Heil\/Comfortmaker furnace platforms that use a 40VA 115-to-24V control transformer. Always confirm your primary voltage and VA rating against the failed unit 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 all primary and secondary wire connections before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e – Disconnect the primary (line) and secondary (24V) leads, then unbolt the transformer from the bracket or panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e – Mount the new transformer, reconnect the primary and secondary leads exactly per your photo, and secure all terminals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e – Restore power and verify 24V across the secondary terminals, then confirm the furnace responds to a heat call.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBlank thermostat and no response to a call for heat\u003c\/li\u003e\n\u003cli\u003eRepeatedly blown low-voltage (3A) control board fuse\u003c\/li\u003e\n\u003cli\u003eZero or low voltage reading across the 24V secondary terminals\u003c\/li\u003e\n\u003cli\u003eAudible buzzing, burning smell, or visibly scorched windings\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":63021685211507,"sku":"1012722-GEN","price":29.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048490418547,"sku":"1012722","price":37.7,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1012722_ca37f382-0329-40a1-bc64-9242ca813262.jpg?v=1782961436","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-transformer-for-t9mpd050f12a2-40va-115v-to-24v-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}