{"product_id":"tempstar-40va-transformer-for-t9mpd050f12a4-115v-to-24v-control-power-ships-today","title":"Tempstar 40VA Transformer for T9MPD050F12A4 — 115V to 24V Control Power | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis genuine OEM control transformer (part number 1012722) supplies low-voltage power for the Tempstar T9MPD050F12A4 gas furnace. It steps 115V line voltage down to 24V at 40VA, energizing the control board, gas valve, igniter circuit, thermostat, and blower relays. A failed transformer is a leading cause of a totally dead furnace — no thermostat display, no ignition sequence, no blower. Watch for a buzzing or scorched transformer, a repeatedly blown low-voltage fuse, or zero volts across the 24V (R to C) terminals. Installing this 40VA OEM transformer restores full control-circuit power.\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 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\u003eStep-Down Control 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\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eFits the Tempstar T9MPD050F12A4 modulating gas furnace and other ICP\/Heil\/Comfortmaker furnaces using a 115V-to-24V 40VA control transformer. Confirm your existing unit is rated 40VA at 115V primary 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 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\/junction access 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 line-voltage primary leads and 24V secondary leads, then unbolt the old transformer from its bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, reconnect primary and secondary leads per your photo, and secure all connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm 24V between R and C, then run a heat call to verify normal ignition.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFurnace completely dead — blank thermostat, no ignition\u003c\/li\u003e\n\u003cli\u003eBuzzing, humming, or burnt-smelling transformer\u003c\/li\u003e\n\u003cli\u003eRepeatedly blown low-voltage (3A) fuse\u003c\/li\u003e\n\u003cli\u003eNo 24V reading across the secondary terminals\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":63021683605875,"sku":"1012722-GEN","price":26.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048406401395,"sku":"1012722","price":33.8,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1012722_ce285e66-0210-49a7-b30e-674618069d6b.jpg?v=1782958368","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-40va-transformer-for-t9mpd050f12a4-115v-to-24v-control-power-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}