{"product_id":"tempstar-24v-transformer-for-t4h342gkd200-40va-control-power-ships-today","title":"Tempstar 24V Transformer for T4H342GKD200 — 40VA Control Power | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis is the OEM 24V control transformer for the Tempstar T4H342GKD200 heat pump, supplying the low-voltage power that drives the 24V reversing-valve coil, contactor coil, and defrost control circuit (related OEM components #1172574 Coil Rev Vlv 24V and #1175622 Valve Rev w\/Coil 24V). The transformer steps line voltage (208\/240V) down to a regulated 24VAC at 40VA. When a transformer fails — usually from a shorted coil or an overloaded secondary — the entire low-voltage side goes dead: the thermostat loses power, the contactor will not pull in, and the reversing valve cannot energize. A buzzing, hot, or blown transformer is a common root cause of a completely unresponsive unit.\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\u003eOEM Part Numbers\u003c\/td\u003e\n\u003ctd\u003e1172574, 1175622 (associated 24V control components)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eControl \/ Class 2 Transformer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eTempstar (ICP \/ Heil family)\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\u003ePrimary Voltage\u003c\/td\u003e\n\u003ctd\u003e208 \/ 240V\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\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM Direct Replacement\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 replacement for the Tempstar T4H342GKD200 heat pump and ICP-built Heil, Comfortmaker, and Carrier\/Bryant private-label units sharing the same 24V control platform. Verify primary voltage taps and the 40VA rating against your existing transformer before wiring.\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 disconnect, then verify zero voltage with a multimeter before touching any wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the control-panel\/service cover to reach the transformer and low-voltage terminal block.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every primary and secondary lead and its terminal before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Label and disconnect the leads, then unbolt the transformer from its mounting bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, match the correct primary tap to your line voltage, and reconnect the 24V secondary per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm 24VAC across the secondary; verify the thermostat, contactor, and reversing valve energize on a call.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNo 24V control power — thermostat blank or system fully unresponsive\u003c\/li\u003e\n\u003cli\u003eContactor or reversing-valve coil will not energize\u003c\/li\u003e\n\u003cli\u003eTransformer is buzzing, hot to the touch, or visibly scorched\u003c\/li\u003e\n\u003cli\u003eRepeated low-voltage fuse blows after the transformer was loaded\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":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021793476979,"sku":"1172574-GEN","price":34.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048397521267,"sku":"1172574","price":44.2,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1172574_6c82425f-c48c-4654-88fa-fa027c4b2630.jpg?v=1782958078","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-24v-transformer-for-t4h342gkd200-40va-control-power-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}