{"product_id":"tempstar-40va-transformer-for-t9mpd050f12c2-115v-to-24v-ships-today","title":"Tempstar 40VA Transformer for T9MPD050F12C2 — 115V to 24V | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis is the genuine OEM 40VA control transformer (part number 1172810) for the Tempstar T9MPD050F12C2 furnace. The transformer steps line voltage down from 115 volts on the primary side to 24 volts on the secondary side, supplying low-voltage control power to the thermostat, control board, gas valve, and ignition circuit. Without a working transformer, none of the furnace's safety and operating controls receive power. Common failure symptoms include a completely dead furnace, a blank or unresponsive thermostat, no response when the thermostat calls for heat, and a tripped or repeatedly blown low-voltage fuse caused by an internal short. A transformer that hums loudly, runs hot to the touch, or shows scorched windings has failed and must be replaced.\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\u003e1172810\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\u003e115 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Voltage\u003c\/td\u003e\n\u003ctd\u003e24 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eT9MPD050F12C2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eEngineered as a direct-fit replacement for the Tempstar T9MPD050F12C2 gas furnace. Because Tempstar, Heil, Comfortmaker, and other ICP brands share a common chassis, this 40VA transformer also serves as the correct control transformer across many ICP-built furnaces of the same generation. Always verify your existing part number is 1172810 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, verify zero voltage with multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photo all wires before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Note the primary (line) and secondary (24V) lead positions, disconnect the leads, and unbolt the transformer from its mounting bracket.\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 confirm tight, clean connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, verify 24V across the secondary terminals with a multimeter, and confirm the furnace responds to a heat call.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFurnace is completely dead with a blank thermostat\u003c\/li\u003e\n\u003cli\u003eLow-voltage fuse blows immediately when power is restored\u003c\/li\u003e\n\u003cli\u003eNo 24V reading across the secondary terminals\u003c\/li\u003e\n\u003cli\u003eTransformer hums loudly, overheats, or smells burnt\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. National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021681869171,"sku":"1172810-GEN","price":32.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048406598003,"sku":"1172810","price":41.6,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1172810_477f6d48-1e8c-42fb-8a03-80d08ce4a0ae.jpg?v=1782958376","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-40va-transformer-for-t9mpd050f12c2-115v-to-24v-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}