{"product_id":"icp-40va-transformer-120-24v-for-wfar100c048c1-furnace-control-transformer-ships-today-1","title":"ICP 40VA Transformer 120\/24V for WFAR100C048C1 — Furnace Control Transformer | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM 40VA control transformer (part 1177217) steps line voltage down from 120V to 24V to power the low-voltage control circuit on the ICP\/Tempstar\/Heil WFAR100C048C1 furnace. The 24V output feeds the thermostat, control board, gas valve, relays, and contactor coil — essentially the entire control system. When a transformer fails or shorts (often after a wiring fault or surge), the thermostat goes blank, the furnace won't respond to a heat or cool call, and no control voltage is present. A 40VA rating provides enough capacity for the furnace's control loads with margin. Installing the exact OEM transformer ensures correct VA capacity, primary\/secondary voltages, and mounting fit.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\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\u003e1177217\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\u003eICP \/ Tempstar \/ Heil\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\u003ePrimary Voltage\u003c\/td\u003e\n\u003ctd\u003e120V\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\u003eFit\u003c\/td\u003e\n\u003ctd\u003eOEM Direct Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDesigned for the ICP\/Tempstar\/Heil WFAR100C048C1 furnace and shared ICP-family platforms (Comfortmaker, Heil, Tempstar). Verify the 120V primary, 24V secondary, and 40VA rating against your existing transformer before installing.\u003c\/p\u003e\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power at the switch and breaker; verify zero voltage with a multimeter.\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 the primary and secondary wiring and note each wire color and terminal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the leads, unbolt the old transformer from the bracket, and remove it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, connect the 120V primary leads and 24V secondary leads per your photo, and secure all connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, confirm 24V across the secondary with a multimeter, and verify the thermostat and furnace respond to a call.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBlank thermostat with no low-voltage power\u003c\/li\u003e\n\u003cli\u003eFurnace won't respond to heat or cool calls\u003c\/li\u003e\n\u003cli\u003eNo 24V reading across the transformer secondary\u003c\/li\u003e\n\u003cli\u003eBurnt smell, discoloration, or repeatedly blown control fuse\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\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":63027246825843,"sku":"1177217-GEN","price":29.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63047950827891,"sku":"1177217","price":37.7,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1177217_f3ccaa04-2d31-49b5-b01e-fe4e3d7cae11.jpg?v=1782882349","url":"https:\/\/nationalhvacparts.com\/products\/icp-40va-transformer-120-24v-for-wfar100c048c1-furnace-control-transformer-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}