{"product_id":"icp-40va-transformer-for-wfml135d066b1-120-24v-oem-1177217-ships-today","title":"ICP 40VA Transformer for WFML135D066B1 — 120\/24V OEM 1177217 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis genuine OEM control transformer (part number 1177217) is the factory step-down transformer for the ICP \/ Heil \/ Tempstar WFML135D066B1 gas furnace. Rated 40VA with a 120V primary and 24V secondary, it converts incoming line voltage into the low-voltage 24V control power that runs the thermostat, gas valve, control board, and safety circuits. When a transformer fails — usually from a short, an overload, or age — the entire low-voltage control system goes dead: the thermostat screen blanks, the furnace won't respond to a call for heat, and no relays or valves energize. A fresh transformer restores reliable 24V power to the whole control circuit.\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\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\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\u003e120 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Voltage\u003c\/td\u003e\n\u003ctd\u003e24 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFit\u003c\/td\u003e\n\u003ctd\u003eOEM exact 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\u003eDirect factory replacement for the ICP \/ Heil \/ Tempstar \/ Comfortmaker WFML135D066B1 furnace and other ICP-family units using a 40VA 120V-to-24V control transformer. Confirm primary\/secondary voltages and VA rating against your existing unit.\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 switch and breaker, then verify zero voltage with a multimeter at both primary and secondary leads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the control\/electrical compartment service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and terminal before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the primary (line) and secondary (24V) leads, then unbolt the transformer from its bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, reconnect primary and secondary leads per your photo, and confirm a solid ground.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and measure 24V across the secondary; confirm the thermostat powers up and the furnace responds to a heat call.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBlank thermostat \/ no low-voltage power\u003c\/li\u003e\n\u003cli\u003eFurnace won't respond to a call for heat\u003c\/li\u003e\n\u003cli\u003eBurnt smell or visible scorching on the transformer\u003c\/li\u003e\n\u003cli\u003e0V reading across the 24V secondary with line voltage present\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\n\u003cp\u003eShips same day on orders placed before 3 PM CST. 30-day hassle-free returns. Backed by the National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"ICP","offers":[{"title":"Direct Replacement","offer_id":63021578879347,"sku":"1177217-GEN","price":26.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63047956431219,"sku":"1177217","price":35.04,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1177217_4afa3ab4-af1c-4036-bb46-b3c232604b8f.jpg?v=1782882775","url":"https:\/\/nationalhvacparts.com\/products\/icp-40va-transformer-for-wfml135d066b1-120-24v-oem-1177217-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}