{"product_id":"icp-40va-transformer-for-sup27m2401bia-120v-to-24v-ships-today","title":"ICP 40VA Transformer for SUP27M2401BIA — 120V to 24V | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM ICP Transformer (part L01F009) is a 40VA step-down transformer that converts 120V line power to the 24V control voltage your SUP27M2401BIA system needs to run the thermostat, relays, and control circuit. The matching 24VAC relay (part L01H009) switches the low-voltage load it powers. When the transformer fails — usually from a shorted control wire or overloaded circuit — you lose all 24V control power: a blank thermostat, no blower or heat\/cool response, and often a blown low-voltage fuse. A correct OEM 40VA replacement restores stable control power.\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\u003eL01F009 (transformer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompanion Relay\u003c\/td\u003e\n\u003ctd\u003eL01H009 — 24VAC relay\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\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\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eICP (Heil \/ Tempstar family)\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\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDirect-fit replacement for the ICP SUP27M2401BIA. This 40VA 120V-to-24V transformer (part L01F009) and its companion 24VAC relay (L01H009) are used across matching ICP-family units, including Heil and Tempstar models. Confirm primary voltage, VA rating, and the original part number on your existing transformer 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 breaker and verify zero voltage with a multimeter before touching any wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the control\/junction panel to reach the transformer and relay.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the primary (120V) and secondary (24V) connections before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the leads, unbolt the transformer from its mounting bracket, and remove it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new L01F009 transformer, reconnect the primary and secondary leads per your photos, and replace any blown low-voltage fuse.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm a steady 24V output at the secondary and normal thermostat\/control operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBlank or dead thermostat with no 24V control power\u003c\/li\u003e\n\u003cli\u003eSystem won't respond to heat or cool calls\u003c\/li\u003e\n\u003cli\u003eRepeatedly blown low-voltage control fuse\u003c\/li\u003e\n\u003cli\u003eBurnt smell, scorching, or buzzing from the transformer\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":"OEM","offer_id":63021831684467,"sku":"L01H009","price":37.64,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047375520115,"sku":"L01H009-GEN","price":28.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-L01H009_ad9cc99b-c6f1-47e6-a3c7-c7a28c3a1fe9.jpg?v=1782882477","url":"https:\/\/nationalhvacparts.com\/products\/icp-40va-transformer-for-sup27m2401bia-120v-to-24v-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}