{"product_id":"icp-24v-transformer-for-rhs243s0ca0aaaa-40va-class-2-control-power-ships-today","title":"ICP 24V Transformer for RHS243S0CA0AAAA — 40VA Class 2 Control Power | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM 24V control transformer supplies the low-voltage power that operates the contactors, relays, and reversing-valve coil inside your ICP RHS243S0CA0AAAA heat pump. It steps line voltage down to a stable 24 volts of Class 2 control power rated at 40VA. Companion OEM parts on this control circuit include the 24V reversing-valve coil (part 1172619) and the 24V DPST relay (part 1178205, T92P7A22-24). When a control transformer fails, the system goes completely dead at the thermostat — no fan, no compressor, no response — even with high-voltage power present at the disconnect. Buzzing, a repeatedly blown low-voltage fuse, or scorched secondary leads are the usual symptoms.\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\u003eControl transformer (24V)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelated OEM Parts\u003c\/td\u003e\n\u003ctd\u003e1172619, 1178205\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eClass 2 control transformer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eICP (Tempstar \/ Heil \/ Comfortmaker family)\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\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDirect fit for the ICP RHS243S0CA0AAAA heat pump and other ICP-built systems using the same 24V control circuit. ICP equipment is sold under the Tempstar, Heil, Comfortmaker, Arcoaire, and KeepRite labels, so this transformer also services equivalent models across those brands. Confirm the VA rating and voltage of your existing transformer 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 unit and breaker, 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 service panel to expose the control box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every primary and secondary lead before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unfasten the failed transformer and disconnect the primary (line) and secondary (24V) leads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, match the primary taps to your supply voltage, and reconnect the secondary leads exactly as photographed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm 24V across the secondary terminals and a normal thermostat call.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSystem is completely unresponsive at the thermostat despite line power\u003c\/li\u003e\n\u003cli\u003eRepeatedly blown low-voltage control fuse\u003c\/li\u003e\n\u003cli\u003eAudible buzzing or humming from the control box\u003c\/li\u003e\n\u003cli\u003eNo measurable 24V on the secondary side under load\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":63021836140915,"sku":"1172619","price":45.44,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047356350835,"sku":"1172619-GEN","price":34.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1172619_97b23332-3730-4808-9c9b-40a22b05b984.jpg?v=1782881929","url":"https:\/\/nationalhvacparts.com\/products\/icp-24v-transformer-for-rhs243s0ca0aaaa-40va-class-2-control-power-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}