{"product_id":"icp-40va-transformer-for-wugd105cg01-120v-to-24v-control-transformer-ships-today","title":"ICP 40VA Transformer for WUGD105CG01 – 120V to 24V Control Transformer | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM 40VA control transformer (part #97298, TRANS RELAY RECEP 120\u0026gt;24 40VA) supplies the low-voltage 24V control power that runs the thermostat, gas valve, ignition control, and relays in your ICP\/Heil\/Tempstar WUGD105CG01 gas furnace. It steps 120V line voltage down to 24V secondary at 40VA, the standard load rating for residential furnace control circuits. The matched 24V SPDT relay (part #92840, RELAY 24V SPDT S) switches blower or auxiliary loads on the control board. When a transformer fails — typically from a shorted thermostat wire, a stuck contactor, or simple age — you lose all 24V control: the furnace goes completely dead, the thermostat screen blanks, or you smell burnt insulation near the control box.\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\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 Control Transformer w\/ Relay Receptacle\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\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\u003eRating\u003c\/td\u003e\n\u003ctd\u003e40 VA\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\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eEngineered as the factory-original 24V control transformer for the ICP \/ Heil \/ Tempstar \/ Comfortmaker WUGD105CG01 gas furnace. The 40VA \/ 120V-to-24V rating is also common across many ICP-family WUGD and WUGC furnace platforms, but always confirm against your unit's nameplate and wiring diagram before installing.\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 furnace switch and breaker; verify zero voltage at the transformer primary with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e – Remove the furnace control\/blower access panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e – Photograph every primary and secondary wire and the relay orientation before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e – Unplug the relay, label and disconnect the 120V primary and 24V secondary leads, then unbolt the old transformer from its mounting bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e – Mount the new transformer, reconnect the primary and secondary leads per your photo, and seat the 24V SPDT relay in its receptacle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e – Restore power and confirm 24V across the secondary and normal call-for-heat operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFurnace completely dead — no response to thermostat and no blower.\u003c\/li\u003e\n\u003cli\u003eBlank or unpowered thermostat (no 24V at R-C).\u003c\/li\u003e\n\u003cli\u003eBlown control fuse that re-blows, or a burnt smell near the control box.\u003c\/li\u003e\n\u003cli\u003eMeasured 0V or incorrect voltage on the 24V secondary with 120V present on the primary.\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":63021476053363,"sku":"WUGD105CG01","price":38.94,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047396917619,"sku":"WUGD105CG01-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-WUGD105CG01.jpg?v=1782883526","url":"https:\/\/nationalhvacparts.com\/products\/icp-40va-transformer-for-wugd105cg01-120v-to-24v-control-transformer-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}