{"product_id":"icp-40va-transformer-for-wugc105cg01-120v-to-24v-with-spdt-relay-ships-today","title":"ICP 40VA Transformer for WUGC105CG01 — 120V to 24V with SPDT Relay | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM transformer assembly powers the 24V control circuit on the ICP\/Heil\/Tempstar WUGC105CG01 gas furnace. It steps 120V line voltage down to 24V at 40VA, supplying the thermostat, gas valve, ignition control, and relays. The kit pairs the OEM transformer-relay receptacle (part 97298, TRANS RELAY RECEP 120\u0026gt;25 40VA) with a 24V SPDT switching relay (part 92840). When this transformer fails, the entire low-voltage control system loses power — the thermostat goes dark, the gas valve will not open, and the furnace will not start. A buzzing transformer, scorched windings, or repeatedly tripped fuses are classic signs of a failing 40VA transformer.\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\u003eOEM Part Numbers\u003c\/td\u003e\n\u003ctd\u003e92840 (Relay 24V SPDT), 97298 (Transformer Relay Receptacle)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eControl Transformer w\/ Relay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eICP \/ Heil \/ Tempstar\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\u003eRelay\u003c\/td\u003e\n\u003ctd\u003e24V SPDT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eEngineered as a direct OEM fit for the ICP\/Heil\/Tempstar WUGC105CG01 gas furnace and shared platform models that use the 40VA 120V-to-24V control transformer. Always confirm your model number before ordering.\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, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the furnace control\/blower compartment 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 wiring leads, unbolt the failed transformer from the control bracket, and detach the relay from its receptacle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer and relay, then reconnect each lead exactly per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm 24V across the secondary terminals and a normal heat call.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eThermostat display is blank and furnace is unresponsive\u003c\/li\u003e\n\u003cli\u003eAudible buzzing or humming from the transformer\u003c\/li\u003e\n\u003cli\u003eBlown low-voltage fuse on the control board\u003c\/li\u003e\n\u003cli\u003eBurnt smell or visibly scorched transformer windings\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":63021476249971,"sku":"WUGC105CG01","price":38.94,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047395934579,"sku":"WUGC105CG01-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-WUGC105CG01.jpg?v=1782883502","url":"https:\/\/nationalhvacparts.com\/products\/icp-40va-transformer-for-wugc105cg01-120v-to-24v-with-spdt-relay-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}