{"product_id":"icp-40va-transformer-for-x8mpn075b12a2-115v-to-24v-ships-today-1","title":"ICP 40VA Transformer for X8MPN075B12A2 — 115V to 24V | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM 40VA control transformer (OEM #1012722) steps 115V line voltage down to the 24V control voltage that powers the thermostat, gas valve, control board, and relays in the ICP \/ Heil \/ Tempstar X8MPN075B12A2 furnace. The transformer is the heart of the low-voltage control circuit — when it fails, the entire 24V system goes dead: no thermostat display, no blower or heat call response, and no ignition sequence. A 40VA rating provides ample capacity for the furnace's control load. This is the genuine OEM step-down transformer matched to your furnace's primary and secondary voltages.\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 \/ Heil \/ Tempstar\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 Direct 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\u003eEngineered for the ICP\/Heil\/Tempstar X8MPN075B12A2 furnace and related X8MPN075 platform units running a 115V primary, 24V secondary control circuit. Verify your existing transformer is a 40VA 115V-to-24V unit before ordering. Primary and secondary leads match the OEM harness for a plug-and-go swap.\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. Verify zero voltage with a multimeter on both line and control terminals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the control compartment service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph all primary (115V) and secondary (24V) lead connections before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the transformer leads, unscrew its mounting bracket, and lift the old transformer out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, reconnect primary to line voltage and secondary to the 24V control circuit per your photos, and confirm no leads are pinched.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and verify 24V across the secondary terminals; confirm the thermostat powers up and the heat cycle starts.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNo 24V at the control board — blank thermostat and no system response.\u003c\/li\u003e\n\u003cli\u003eFurnace completely dead despite line voltage being present.\u003c\/li\u003e\n\u003cli\u003eBurning smell or visibly scorched transformer windings.\u003c\/li\u003e\n\u003cli\u003eBlown low-voltage fuse that re-blows after a short in the 24V circuit.\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":"OEM","offer_id":63027200622963,"sku":"1012722","price":44.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047398195571,"sku":"1012722-GEN","price":34.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1012722_39232c0b-f95b-4a71-a670-1a4fe184a8a6.jpg?v=1782883562","url":"https:\/\/nationalhvacparts.com\/products\/icp-40va-transformer-for-x8mpn075b12a2-115v-to-24v-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}