{"product_id":"icp-40va-transformer-for-wfml090c048b1-120-24v-control-transformer-ships-today-1","title":"ICP 40VA Transformer for WFML090C048B1 — 120\/24V Control Transformer | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM 40VA control transformer steps 120V line voltage down to 24V to power the low-voltage control circuit on your ICP \/ Heil \/ Tempstar WFML090C048B1 furnace. The 24V output feeds the thermostat, gas valve, control board relays, and inducer\/blower controls. When a transformer fails — often from a shorted control wire, a stuck contactor, or simple age — the entire 24V circuit goes dead: the thermostat screen goes blank (if R-powered) and the furnace will not respond to a call for heat. This is the correct OEM part 1177217, rated 40VA with a 120V primary and 24V secondary.\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\u003eOEM Part 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\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 \/ Comfortmaker\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\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e120V Primary \/ 24V Secondary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eWFML090C048B1\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 for the ICP\/Heil\/Tempstar\/Comfortmaker WFML090C048B1 furnace. Confirm your existing transformer is a 120V-primary, 40VA unit before ordering — some installations use 208\/240V multi-tap transformers.\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\/electrical service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph all primary (line) and secondary (24V) leads before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the primary and secondary wires, then unbolt the transformer from its mounting bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, connect the 120V primary leads to line, and wire the 24V secondary to R and C per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, measure 24V across the secondary terminals, and run a heat cycle to confirm operation.\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 power — thermostat blank and furnace unresponsive.\u003c\/li\u003e\n\u003cli\u003eBlown low-voltage fuse on the control board that re-blows on reset.\u003c\/li\u003e\n\u003cli\u003eBurnt smell or visibly scorched transformer windings.\u003c\/li\u003e\n\u003cli\u003eNo measurable 24V at the secondary with 120V present on the primary.\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":63027241222515,"sku":"1177217-GEN","price":27.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63047956332915,"sku":"1177217","price":36.34,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1177217_d5367b90-ddd0-4823-b9ad-a84f9426d469.jpg?v=1782882768","url":"https:\/\/nationalhvacparts.com\/products\/icp-40va-transformer-for-wfml090c048b1-120-24v-control-transformer-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}