{"product_id":"icp-40va-transformer-for-wfmr045a036b1-120v-to-24v-furnace-control-ships-today","title":"ICP 40VA Transformer for WFMR045A036B1 — 120V to 24V Furnace Control | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis genuine ICP 40VA control transformer (OEM part number 1177217) steps line voltage down from 120V to 24V to power the low-voltage control circuit of the WFMR045A036B1 gas furnace. The 24V output drives the thermostat, gas valve, control board relays, and safety switches. When a transformer fails — typically from a shorted control wire, a stuck gas valve drawing excess current, or simple age — the entire furnace goes dead: no thermostat response, no blower, no ignition. A blown transformer is one of the most common no-heat causes and is inexpensive to replace. Look for a furnace that is completely unresponsive at the thermostat while line voltage is confirmed present at the unit, or a transformer that is hot, swollen, or smells burnt.\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 (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 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\u003eFits the ICP \/ Tempstar \/ Heil WFMR045A036B1 gas furnace and other ICP-family units calling for a 40VA 120-24V control transformer. Verify your existing transformer is rated 120V primary \/ 24V secondary before ordering.\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, then verify zero voltage at the transformer primary leads with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the furnace control-area service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph all primary (120V) and secondary (24V) wire connections before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the leads, remove the transformer mounting screws, and lift out the old unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, 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 at the secondary with a meter, and verify the furnace responds to a thermostat call.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFurnace completely unresponsive while 120V line power is present\u003c\/li\u003e\n\u003cli\u003eNo 24V reading at the control board or thermostat terminals\u003c\/li\u003e\n\u003cli\u003eTransformer is hot, swollen, or has a burnt odor\u003c\/li\u003e\n\u003cli\u003eRepeated control-fuse blowing after the transformer fails\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 returns. Backed by the National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"ICP","offers":[{"title":"Direct Replacement","offer_id":63021570326899,"sku":"1177217-GEN","price":26.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63047956562291,"sku":"1177217","price":33.8,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1177217_020a86e6-1f55-48df-ad9f-75f85f96c35d.jpg?v=1782882790","url":"https:\/\/nationalhvacparts.com\/products\/icp-40va-transformer-for-wfmr045a036b1-120v-to-24v-furnace-control-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}