{"product_id":"icp-transformer-for-wfml110c066b3-40va-120-24v-ships-today","title":"ICP Transformer for WFML110C066B3 — 40VA 120\/24V | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis genuine OEM control transformer (part number 1177217) is rated 40VA 120V-24V and fits the ICP Tempstar Heil WFML110C066B3 gas furnace. It steps down 120V line voltage to the 24V control voltage that powers the thermostat, gas valve, ignition control, and relay circuit. The 40VA rating supplies the current the entire low-voltage control side requires. A failed transformer leaves the furnace dead on the control side — no thermostat display, no call for heat — and frequently blows the control board's low-voltage fuse. Buzzing, overheating, or a scorched housing all indicate the transformer has failed and must be replaced.\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 (step-down)\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\u003e40 VA\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 Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDirect OEM fit for the ICP Tempstar Heil WFML110C066B3 furnace and compatible across ICP-family gas furnaces using a 40VA 120V-to-24V control transformer. Confirm your existing transformer is rated 120V primary \/ 24V secondary at 40VA 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 furnace switch and breaker, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the furnace control\/blower service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph all primary and secondary wire connections before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the 120V primary and 24V secondary leads, then unbolt the transformer from its bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer and reconnect 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, and verify the furnace responds to a call for heat.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFurnace fully unresponsive — no thermostat power or display\u003c\/li\u003e\n\u003cli\u003eRepeatedly blown low-voltage control fuse\u003c\/li\u003e\n\u003cli\u003eBuzzing or humming from the transformer\u003c\/li\u003e\n\u003cli\u003eBurnt smell, discoloration, or melted housing\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":"OEM","offer_id":63021581959539,"sku":"1177217","price":32.44,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047741374835,"sku":"1177217-GEN","price":24.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1177217_f44dac79-a91d-43f0-b68c-74d20400724b.jpg?v=1782896493","url":"https:\/\/nationalhvacparts.com\/products\/icp-transformer-for-wfml110c066b3-40va-120-24v-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}