{"product_id":"icp-transformer-for-rhs090l0aa0aaaa-40va-24v-control-ships-today","title":"ICP Transformer for RHS090L0AA0AAAA — 40VA 24V Control | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis is a genuine OEM 40VA control transformer for the ICP (International Comfort Products) RHS090L0AA0AAAA heat pump system. The transformer steps line voltage (208\/240V primary) down to the 24V secondary that powers your thermostat, control board, contactor coil, reversing-valve solenoid, and relays — including the associated 24V components on this unit such as the reversing valve coil and DPST relay. When a transformer fails, the entire low-voltage control circuit goes dead: the thermostat screen blanks, the contactor won't pull in, and nothing responds to a heating or cooling call. Failures are usually caused by a shorted thermostat wire, a stuck contactor drawing excess coil current, or simple age-related winding breakdown. Installing a properly rated 40VA transformer restores full control power and protects downstream components.\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 \/ Tempstar \/ Heil \/ Comfortmaker\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\u003eRelated 24V Parts\u003c\/td\u003e\n\u003ctd\u003e1172619, 1178205, 1175367, 1190263\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eBuilt for the ICP RHS090L0AA0AAAA heat pump and used across many ICP-family systems sold under the Tempstar, Heil, Comfortmaker, and Arcoaire brands. Confirm your primary voltage (208\/240V) and VA rating before ordering.\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 before touching any wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the service\/control panel to reach the transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph all primary and secondary leads before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the primary (line) and secondary (24V) wires and unbolt the old transformer from its bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer and reconnect primary and secondary leads exactly per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm 24V at the secondary and that the thermostat and controls power up.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBlank thermostat and no response to heating or cooling calls.\u003c\/li\u003e\n\u003cli\u003eNo measurable 24V at the secondary terminals.\u003c\/li\u003e\n\u003cli\u003eContactor and reversing valve won't energize.\u003c\/li\u003e\n\u003cli\u003eBurnt smell or visibly scorched transformer housing.\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":63021888733555,"sku":"1172619","price":41.54,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047727350131,"sku":"1172619-GEN","price":31.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1172619_4a74c9e1-029e-4cad-85bc-307f761937b8.jpg?v=1782896128","url":"https:\/\/nationalhvacparts.com\/products\/icp-transformer-for-rhs090l0aa0aaaa-40va-24v-control-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}