{"product_id":"icp-24v-control-transformer-for-wch3484gkb1-40va-class-2-ships-today-1","title":"ICP 24V Control Transformer for WCH3484GKB1 — 40VA Class 2 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM 24-volt control transformer supplies the low-voltage power that runs the thermostat, contactor coil, reversing valve solenoid, and control circuit on the ICP\/Tempstar\/Heil WCH3484GKB1 heat pump system. It steps line voltage down to a stable 24V Class 2 output rated at 40VA. When a transformer fails — usually from a shorted control wire, a stuck contactor coil drawing excess current, or age — the entire low-voltage side goes dead: no thermostat display, no contactor pull-in, and no system response to a call for heat or cool. A clicking or buzzing transformer, or one that runs hot to the touch, is a sign it's on the way out.\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\u003eType\u003c\/td\u003e\n\u003ctd\u003eStep-Down Control Transformer (Class 2)\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\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\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eLow-voltage control circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelated OEM Parts\u003c\/td\u003e\n\u003ctd\u003e1172574, 1175622\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM direct replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDirect-fit for the ICP WCH3484GKB1 heat pump and related WCH3484 series units sold under ICP, Tempstar, Heil, and Comfortmaker. Confirm primary line voltage and the 24V\/40VA rating against the unit's wiring diagram 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 breaker and disconnect. Verify zero voltage at the transformer primary leads with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the control panel cover to reach the transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the primary (line) and secondary (24V) wire connections before removing anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the primary and secondary leads, then unbolt the transformer from its mounting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer and reconnect the primary and secondary wiring 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, then verify the thermostat and contactor energize on a call.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDead thermostat \/ no low-voltage power at the control board.\u003c\/li\u003e\n\u003cli\u003eTransformer buzzes, hums loudly, or runs visibly hot.\u003c\/li\u003e\n\u003cli\u003eSystem won't respond to a heat or cool call despite line power present.\u003c\/li\u003e\n\u003cli\u003eNo 24V measured across the secondary with the unit powered.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\u003cp\u003eShips same day on orders placed before 3 PM CST. 30-day hassle-free returns. Backed by the National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"ICP","offers":[{"title":"Direct Replacement","offer_id":63027252068723,"sku":"1172574-GEN","price":28.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63047944241523,"sku":"1172574","price":37.63,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1172574_d49bcc13-95e1-4950-a9cd-27d1e93accff.jpg?v=1782881882","url":"https:\/\/nationalhvacparts.com\/products\/icp-24v-control-transformer-for-wch3484gkb1-40va-class-2-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}