{"product_id":"icp-40va-transformer-for-x9mpd075f12b1-115v-to-24v-control-ships-today","title":"ICP 40VA Transformer for X9MPD075F12B1 — 115V to 24V Control | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM 40VA control transformer (part 1012722) steps the furnace's 115 VAC line voltage down to the 24 VAC low-voltage control circuit on the ICP \/ Tempstar \/ Heil X9MPD075F12B1 gas furnace. Every low-voltage control on the system — the thermostat, gas valve, igniter circuit through the control board, and blower relays — depends on a clean, stable 24V supply from this transformer. When it fails, the furnace goes completely dead on the control side: no thermostat response, no ignition sequence, and often a blown low-voltage fuse on the board. Transformers fail from age, shorted secondary wiring, or a stuck gas valve drawing excess current that overheats the windings. Replacing a marginal or burned-out transformer restores reliable 24V control power to the entire system.\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 (TRANS 115\u0026gt;24 40VA)\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\u003eICP \/ Tempstar \/ Heil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Voltage\u003c\/td\u003e\n\u003ctd\u003e115 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VAC\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\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eX9MPD075F12B1\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 OEM replacement transformer for the ICP\/Tempstar\/Heil X9MPD075F12B1 furnace control circuit. Confirm the 115V primary \/ 24V secondary rating and the 40 VA size, and compare the mounting bracket and terminal layout to the original 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 and verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the furnace control-compartment service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the primary (line) and secondary (24V) leads and their terminal positions before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the four leads, then remove the transformer mounting screws or bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, then reconnect the 115V primary and 24V secondary leads exactly per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, confirm 24 VAC across the secondary with a meter, and run a full heat cycle.\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 unresponsive to the thermostat (no ignition sequence).\u003c\/li\u003e\n\u003cli\u003eNo 24 VAC measured at the transformer secondary.\u003c\/li\u003e\n\u003cli\u003eRepeatedly blown low-voltage control fuse on the board.\u003c\/li\u003e\n\u003cli\u003eBurnt smell or visibly scorched \/ swollen transformer body.\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":"ICP","offers":[{"title":"Direct Replacement","offer_id":63021461209459,"sku":"X9MPD075F12B1-GEN","price":28.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63047965933939,"sku":"X9MPD075F12B1","price":36.4,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-X9MPD075F12B1.jpg?v=1782883585","url":"https:\/\/nationalhvacparts.com\/products\/icp-40va-transformer-for-x9mpd075f12b1-115v-to-24v-control-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}