{"product_id":"icp-transformer-for-wfml135d066b3-40va-120-24v-control-transformer-ships-today-1","title":"ICP Transformer for WFML135D066B3 — 40VA 120\/24V Control Transformer | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM control transformer (part #1177217) converts 120V line voltage to the 24V control voltage that operates your ICP, Tempstar, or Heil furnace. Rated at 40VA, it supplies the thermostat circuit, ignition control board, gas valve, and blower relays. When the transformer fails, the low-voltage control system shuts down completely — the thermostat goes dark, no heat or cool call is honored, and the blower stays off. A repeatedly blown low-voltage fuse, an audible buzz, or a scorched smell at the control box indicates an overloaded or internally shorted transformer. This factory-spec 40VA 120\/24V unit is a direct drop-in replacement.\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\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\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM Direct Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eFits ICP model WFML135D066B3 and related Tempstar, Heil, and Comfortmaker furnaces that use a 40VA 120\/24V control transformer. Confirm the primary voltage tap and VA rating against the failed unit 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 breaker and verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the furnace service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the primary and secondary wiring before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the line and 24V leads, then unbolt the old transformer from the control panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, reconnect leads exactly per your photo, and verify the correct primary tap.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm 24V across the secondary terminals and normal furnace control response.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eNo 24V output \/ dead thermostat and controls\u003c\/li\u003e\n\u003cli\u003eLow-voltage fuse blows repeatedly\u003c\/li\u003e\n\u003cli\u003eBuzzing or humming from the transformer\u003c\/li\u003e\n\u003cli\u003eBurnt smell or scorching at the control box\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":63027240370547,"sku":"1177217","price":38.94,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047741768051,"sku":"1177217-GEN","price":29.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1177217_9289cf17-8707-4971-b0fe-b97f83437707.jpg?v=1782896505","url":"https:\/\/nationalhvacparts.com\/products\/icp-transformer-for-wfml135d066b3-40va-120-24v-control-transformer-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}