{"product_id":"icp-transformer-40va-208-230v-to-24v-for-wja342000ktp0a1-class-ii-step-down-ships-today-1","title":"ICP Transformer 40VA 208\/230V to 24V for WJA342000KTP0A1 — Class II Step-Down | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis is a genuine OEM 40VA control transformer (OEM part #1173691) for the ICP \/ Tempstar \/ Heil WJA342000KTP0A1 system, supplied with the matching 24V barrier (OEM part #1176032). The transformer steps the incoming 208\/230V line voltage down to the 24V control voltage that powers the thermostat, contactor coil, control board, and safety circuits. Its 40VA rating provides enough current to drive the low-voltage components without overloading. When a transformer fails, the entire low-voltage control side goes dead: the thermostat may go blank, the contactor will not pull in, and the system ignores calls for heating or cooling even with line power present. Typical causes are a shorted contactor coil, a pinched 24V wire, or a power surge.\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\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e1173691 (transformer), 1176032 (barrier)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eClass II Step-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\u003eVA 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\u003e208 \/ 230 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Voltage\u003c\/td\u003e\n\u003ctd\u003e24 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eEngineered for the ICP \/ Tempstar \/ Heil WJA342000KTP0A1 and compatible 208\/230V residential HVAC equipment using a 24V control circuit. Always confirm the original transformer's primary\/secondary voltage and VA rating 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 verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the service panel to reach the control area.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph all primary and secondary wiring before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the line-voltage and 24V leads, then unbolt the old transformer and barrier from the mounting bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer and 24V barrier, then reconnect the primary and secondary wires exactly per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm 24V at the secondary terminals and proper system operation.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eNo 24V control voltage \/ blank thermostat with line power present\u003c\/li\u003e\n\u003cli\u003eContactor will not pull in on a call for cooling\u003c\/li\u003e\n\u003cli\u003eVisible scorching, swelling, or a burnt smell at the transformer\u003c\/li\u003e\n\u003cli\u003eRepeatedly blown low-voltage fuse after a shorted coil\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":63027233292659,"sku":"1176032","price":37.7,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047724859763,"sku":"1176032-GEN","price":29.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1176032_0a329cf6-2789-4958-a114-5b7554e670e9.jpg?v=1782896066","url":"https:\/\/nationalhvacparts.com\/products\/icp-transformer-40va-208-230v-to-24v-for-wja342000ktp0a1-class-ii-step-down-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}