{"product_id":"tempstar-transformer-for-t8dnl100f14b1-115v-to-24v-40va-ships-today","title":"Tempstar Transformer for T8DNL100F14B1 — 115V to 24V 40VA | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis is a genuine OEM control transformer (part number 1172810) for the Tempstar T8DNL100F14B1 gas furnace. The transformer steps down 115-volt line power to the 24-volt low-voltage control circuit that runs your thermostat, gas valve, igniter, and control board. It is rated at 40VA, giving it the capacity to drive the full complement of low-voltage components on a single-stage furnace. When a 24V transformer fails, the entire control system goes dead — the thermostat screen may go blank, the furnace will not respond to a call for heat, and you will often find a blown low-voltage fuse on the control board. A buzzing or humming transformer, a burnt smell near the control compartment, or zero volts at the secondary terminals are all signs the transformer has shorted internally and needs replacement.\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 (ICP \/ Heil family)\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\u003eFit\u003c\/td\u003e\n\u003ctd\u003eOEM Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDesigned as the factory transformer for the Tempstar T8DNL100F14B1 furnace. Because Tempstar, ICP, Heil, Comfortmaker, and Arcoaire furnaces share the same parts platform, this 115V-to-24V 40VA transformer also services many comparable single-stage models in that family. Always confirm the printed primary\/secondary voltage and VA rating against your old transformer before installing.\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 before touching any wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the furnace control\/blower service panel to expose the control compartment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire on the transformer's primary and secondary terminals before disconnecting anything.\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 its mounting bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, then reconnect the primary and secondary leads exactly as shown in your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm 24V across the secondary terminals and a normal call for heat.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThermostat is blank or unresponsive and the furnace will not start.\u003c\/li\u003e\n\u003cli\u003eRepeated blown low-voltage fuses on the control board.\u003c\/li\u003e\n\u003cli\u003eAudible buzzing or humming from the transformer.\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":63021778272627,"sku":"1172810-GEN","price":32.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048489992563,"sku":"1172810","price":42.84,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1172810_ead6c22f-c7de-47fa-8a39-b1f4b241b9e6.jpg?v=1782961417","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-transformer-for-t8dnl100f14b1-115v-to-24v-40va-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}