{"product_id":"tempstar-40va-transformer-for-t9mpd050f12c1-115v-to-24v-ships-today","title":"Tempstar 40VA Transformer for T9MPD050F12C1 — 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 T9MPD050F12C1 furnace. The transformer reduces 115-volt line power on the primary side to 24-volt control power on the secondary side, energizing the thermostat, control board, gas valve, and ignition circuit. If the transformer fails, the entire low-voltage control system goes dark and the furnace will not respond to any heat call. Watch for a completely dead furnace, a blank thermostat, a repeatedly blown low-voltage fuse from an internal short, or a transformer that hums loudly and runs hot. A scorched or buzzing transformer should be replaced promptly to restore reliable furnace operation.\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\u003eT9MPD050F12C1\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-fit replacement control transformer for the Tempstar T9MPD050F12C1 gas furnace. Because the ICP platform is shared, the same 40VA transformer fits many Tempstar, Heil, and Comfortmaker furnaces of this generation. Confirm your existing part 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 and secondary lead positions, disconnect the leads, and unbolt the transformer from its bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer and reconnect the primary and secondary leads exactly per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, confirm 24V across the secondary terminals, and verify 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 as soon as power is restored\u003c\/li\u003e\n\u003cli\u003eNo 24V reading across the secondary terminals\u003c\/li\u003e\n\u003cli\u003eTransformer hums, 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":63021682327923,"sku":"1172810-GEN","price":32.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048406532467,"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_15d78bd7-51b0-4409-a715-4b6ee0b6b233.jpg?v=1782958374","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-40va-transformer-for-t9mpd050f12c1-115v-to-24v-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}