{"product_id":"icp-40va-transformer-for-wahm482a1-208-230v-to-24v-oem-1172028-ships-today","title":"ICP 40VA Transformer for WAHM482A1 — 208\/230V to 24V OEM 1172028 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis ICP OEM step-down transformer (part number 1172028) reduces the 208\/230V line voltage feeding the WAHM482A1 air handler to the 24V control voltage that drives the thermostat, relays, and low-voltage circuits. Rated at 40VA, it supplies the current the unit's control loads require. A failed transformer is a leading cause of a completely dead system: without 24V output the thermostat goes blank, relays and contactors won't energize, and nothing runs despite line power being present. These transformers typically fail from a shorted thermostat wire, a stuck contactor pulling excess current, or normal age and heat fatigue.\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\u003e1172028\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\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\u003e208\/230V\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\u003e40VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFit\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\u003eFactory replacement transformer for the ICP\/Tempstar\/Heil WAHM482A1 air handler and related WAHM-series units originally equipped with part 1172028. Confirm your primary voltage tap (208 vs 230) matches your supply before energizing.\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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the air handler control-box service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph all primary and secondary wire connections before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the leads, unbolt the transformer from its bracket, and remove it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new 1172028 transformer, land the correct primary tap for your line voltage, and reconnect the 24V secondary leads per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and verify 24V across the secondary and normal system 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 thermostat and a completely unresponsive system.\u003c\/li\u003e\n\u003cli\u003eNo 24V reading across the transformer secondary.\u003c\/li\u003e\n\u003cli\u003eContactors or relays fail to energize on a call for heat or cool.\u003c\/li\u003e\n\u003cli\u003eBurn marks, melted housing, or a repeatedly blown control circuit.\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":63021617807731,"sku":"1172028-GEN","price":29.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63047953219955,"sku":"1172028","price":37.7,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1172028_f810bb5d-c05b-4555-ada7-989c73025caf.jpg?v=1782882534","url":"https:\/\/nationalhvacparts.com\/products\/icp-40va-transformer-for-wahm482a1-208-230v-to-24v-oem-1172028-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}