{"product_id":"icp-40va-transformer-24v-relay-for-wugb105ag01-120v-to-24v-oem-ships-today","title":"ICP 40VA Transformer \u0026 24V Relay for WUGB105AG01 — 120V to 24V OEM | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM control-power kit for the WUGB105AG01 gas furnace includes the 40VA step-down transformer (OEM #97298, TRANS RELAY RECEP 120\u0026gt;24 40VA) and the matching 24V SPDT relay (OEM #92840, RELAY 24V SPDT S). The transformer converts incoming 120V line voltage down to the 24V used by the thermostat, control board, gas valve, and safety circuits, while the relay switches blower or accessory loads on the low-voltage signal. A failed transformer leaves the furnace completely dead — no thermostat response, no ignition sequence — while a failed relay causes intermittent blower operation or chattering. Both parts are built to OEM specification for the ICP\/Heil\/Tempstar furnace platform.\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\u003eTransformer Rating\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 Type\u003c\/td\u003e\n\u003ctd\u003e24V SPDT\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\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eWUGB105AG01\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 OEM fit for the ICP\/Heil\/Tempstar WUGB105AG01 gas furnace and compatible ICP-family models (Comfortmaker, Arcoaire, KeepRite) using the 40VA 120-to-24V transformer and SPDT relay. Verify part numbers 97298 and 92840 against your existing components 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 furnace switch and breaker, and verify zero voltage with a multimeter on both primary and secondary leads.\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 wire connections on the transformer and relay before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Label and disconnect the primary (120V) and secondary (24V) leads, then unscrew the transformer and relay from the cabinet.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer and relay, then reconnect each wire exactly per your photo, observing primary vs. secondary terminals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, measure ~24V across the secondary, and run a heat cycle to confirm normal 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 is completely unresponsive — no thermostat or ignition activity\u003c\/li\u003e\n\u003cli\u003eNo 24V reading at the control board or gas valve\u003c\/li\u003e\n\u003cli\u003eBlown low-voltage fuse that fails again immediately\u003c\/li\u003e\n\u003cli\u003eChattering, buzzing, or intermittent relay\/blower operation\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":"Direct Replacement","offer_id":63021476675955,"sku":"WUGB105AG01-GEN","price":38.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63047950565747,"sku":"WUGB105AG01","price":50.64,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-WUGB105AG01.jpg?v=1782882321","url":"https:\/\/nationalhvacparts.com\/products\/icp-40va-transformer-24v-relay-for-wugb105ag01-120v-to-24v-oem-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}