{"product_id":"icp-40va-120v-to-25v-transformer-with-relay-receptacle-for-wugf105ah01-oem-97298-ships-today","title":"ICP 40VA 120V to 25V Transformer with Relay Receptacle for WUGF105AH01 — OEM 97298 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis genuine OEM control assembly for the ICP\/Tempstar\/Heil WUGF105AH01 furnace pairs a 40VA step-down transformer with integrated relay receptacle (part number 97298, 120V primary to 25V secondary) and a 24V SPDT control relay (part number 92840). The transformer powers the furnace's low-voltage control circuit — thermostat, gas valve, igniter sequence, and control board — while the SPDT relay switches a control circuit such as the blower. When the transformer fails the furnace goes completely unresponsive with no thermostat power; when the relay fails the controlled circuit (often the blower) stops switching reliably. Because both parts share the WUGF105AH01 control circuit, replacing them together restores full low-voltage control operation.\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\u003eTransformer Part Number\u003c\/td\u003e\n\u003ctd\u003e97298\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelay Part Number\u003c\/td\u003e\n\u003ctd\u003e92840\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eStep-Down Transformer w\/ Relay Receptacle + SPDT Relay\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\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\u003e25V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRating\u003c\/td\u003e\n\u003ctd\u003e40VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelay\u003c\/td\u003e\n\u003ctd\u003e24V SPDT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eWUGF105AH01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eFactory replacement transformer-and-relay control parts for the ICP\/Tempstar\/Heil WUGF105AH01 furnace. The 120V-to-25V, 40VA transformer with relay receptacle and the 24V SPDT relay are common across ICP-family furnaces — verify voltage ratings and terminal layout against your originals 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 furnace switch and breaker and verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the furnace control compartment service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph all transformer primary\/secondary leads and the relay terminal wiring before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect and label the leads, then unbolt the transformer and unclip the relay from the receptacle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, seat the relay in its receptacle, and reconnect every lead exactly per your photos.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, verify 25V across the secondary, confirm the relay clicks on demand, and check normal furnace operation.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFurnace completely unresponsive with no thermostat power\u003c\/li\u003e\n\u003cli\u003eRepeatedly blown low-voltage control fuse\u003c\/li\u003e\n\u003cli\u003eBlower or controlled circuit fails to switch on demand\u003c\/li\u003e\n\u003cli\u003eBuzzing transformer or chattering\/pitted relay contacts\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":"Direct Replacement","offer_id":63021475299699,"sku":"WUGF105AH01-GEN","price":28.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63047950369139,"sku":"WUGF105AH01","price":37.63,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-WUGF105AH01.jpg?v=1782882301","url":"https:\/\/nationalhvacparts.com\/products\/icp-40va-120v-to-25v-transformer-with-relay-receptacle-for-wugf105ah01-oem-97298-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}