{"product_id":"icp-24v-40va-control-transformer-for-rhs090h0ba0aaaa-class-ii-ships-today","title":"ICP 24V 40VA Control Transformer for RHS090H0BA0AAAA – Class II | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM 24-volt control transformer supplies low-voltage power to the control circuit of the ICP\/Heil\/Tempstar RHS090H0BA0AAAA heat pump. It steps line voltage down to 24V to drive the thermostat, contactor coil, reversing valve solenoid (OEM coils 1172619\/1175367\/1190263), and control relay (OEM 1178205). Rated 40VA, it provides the steady, regulated control power the system needs. When a transformer fails — usually from a shorted solenoid, overload, or burned winding — the unit goes completely dead with no thermostat response, even though line power is present.\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\u003eControl \/ Step-Down Transformer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eICP \/ Heil \/ Tempstar \/ Comfortmaker\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\u003eClass\u003c\/td\u003e\n\u003ctd\u003eClass II Low Voltage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelated OEM Parts\u003c\/td\u003e\n\u003ctd\u003e1178205 relay, 1172619\/1175367\/1190263 rev-valve coils\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDirect-fit control transformer for the ICP\/Heil\/Tempstar\/Comfortmaker RHS090H0BA0AAAA heat pump and comparable ICP-family units that use a 24V\/40VA control circuit. Verify your existing transformer's primary voltage and 40VA 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 disconnect, then 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 box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e – Photograph the primary and secondary wire connections before removing them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e – Disconnect the line-voltage primary and 24V secondary leads, then unbolt the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e – Mount the new transformer and reconnect primary and secondary leads to match your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e – Restore power and verify 24V at the secondary and normal thermostat operation.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSystem completely unresponsive with line power present\u003c\/li\u003e\n\u003cli\u003eNo 24V reading at the transformer secondary\u003c\/li\u003e\n\u003cli\u003eBurning smell or visibly scorched transformer body\u003c\/li\u003e\n\u003cli\u003eRepeated control-fuse blowing after a shorted solenoid\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 returns. Backed by the National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"ICP","offers":[{"title":"Direct Replacement","offer_id":63021890044275,"sku":"1172619-GEN","price":28.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63047943618931,"sku":"1172619","price":37.63,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1172619_17bc3b62-7928-4fb9-a0d0-1f8b0b7d0761.jpg?v=1782881836","url":"https:\/\/nationalhvacparts.com\/products\/icp-24v-40va-control-transformer-for-rhs090h0ba0aaaa-class-ii-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}