{"product_id":"icp-40va-transformer-for-wfmr110c066b3-120v-to-24v-control-ships-today-1","title":"ICP 40VA Transformer for WFMR110C066B3 — 120V to 24V Control | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM \u003cstrong\u003e40VA\u003c\/strong\u003e control transformer, part number \u003cstrong\u003e1177217\u003c\/strong\u003e, supplies the 24V low-voltage power for the ICP \/ Tempstar \/ Heil \u003cstrong\u003eWFMR110C066B3\u003c\/strong\u003e furnace. It steps incoming \u003cstrong\u003e120V\u003c\/strong\u003e line voltage down to \u003cstrong\u003e24V\u003c\/strong\u003e to drive the control board, thermostat circuit, gas valve, and relays. A failed transformer takes the entire low-voltage system offline — no thermostat response, no ignition, and often a blank or dead control board. Transformers fail from age, shorted control wiring, or a seized contactor\/gas valve drawing excess current, so always check downstream loads after a failure.\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\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eGas Furnace control circuit\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-fit replacement for the ICP-family \u003cstrong\u003eWFMR110C066B3\u003c\/strong\u003e furnace and shared platform models sold under Tempstar, Heil, Comfortmaker, and Arcoaire. Verify primary\/secondary voltage and VA rating against your existing transformer.\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. Verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the furnace control\/service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the primary (120V) and secondary (24V) lead connections before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the leads, remove the mounting screw, and take out the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new 40VA transformer and reconnect 120V primary and 24V secondary leads per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm 24V at the secondary and normal control\/ignition 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 control power \/ dead control board\u003c\/li\u003e\n\u003cli\u003eThermostat unresponsive with line voltage present\u003c\/li\u003e\n\u003cli\u003eTransformer humming loudly, overheating, or smelling burnt\u003c\/li\u003e\n\u003cli\u003eBlown low-voltage fuse that recurs after reset\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":63027237650803,"sku":"1177217-GEN","price":26.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63047956824435,"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_e657ab6d-a649-4069-8bca-f30f28f0965d.jpg?v=1782882817","url":"https:\/\/nationalhvacparts.com\/products\/icp-40va-transformer-for-wfmr110c066b3-120v-to-24v-control-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}