{"product_id":"icp-transformer-for-waha18074a1-40va-208-230v-to-24v-ships-today","title":"ICP Transformer for WAHA18074A1 – 40VA 208\/230V to 24V | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis genuine OEM control transformer (part number 1173844) steps 208\/230V line voltage down to the 24V required to power the thermostat, control board, relays, and contactor in the ICP\/Tempstar\/Heil WAHA18074A1. Rated at 40VA, it feeds the low-voltage control circuit that runs the whole system. A failed transformer is one of the most common no-heat \/ no-cool causes: when it opens or shorts, the thermostat goes dark and nothing energizes. Transformers typically fail from a low-voltage short, a seized contactor coil pulling excess current, or age and heat.\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\u003e1173844\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eStep-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\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 \/ 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\u003eDirect OEM replacement for the ICP WAHA18074A1 air handler and the matching Tempstar, Heil, and Comfortmaker units using the same 40VA control transformer. Verify your existing transformer is marked 1173844 with a 208\/230V primary and 24V secondary 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 confirm zero voltage at the control box with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e – Remove the control\/electrical service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e – Photograph the primary and secondary wiring before disconnecting any leads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e – Disconnect all primary and secondary 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 208\/230V primary leads to line voltage and the 24V secondary to the control circuit per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e – Restore power and confirm 24V across the secondary and a live thermostat.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eThermostat is blank and the system is completely dead\u003c\/li\u003e\n\u003cli\u003eNo 24V reading across the secondary terminals (R to C)\u003c\/li\u003e\n\u003cli\u003eTransformer is hot, buzzing, or smells burnt\u003c\/li\u003e\n\u003cli\u003eRepeated blown low-voltage fuse or tripped breaker on the control circuit\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":63021622100339,"sku":"1173844","price":37.7,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047728628083,"sku":"1173844-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-1173844_feebbf3e-e087-4084-a97a-1e5f37555866.jpg?v=1782896179","url":"https:\/\/nationalhvacparts.com\/products\/icp-transformer-for-waha18074a1-40va-208-230v-to-24v-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}