{"product_id":"icp-transformer-for-wahm364b1-40va-208-230v-to-24v-step-down-ships-today","title":"ICP Transformer for WAHM364B1 - 40VA 208\/230V to 24V Step-Down | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM control transformer (part #1172028) is the low-voltage power source for your ICP WAHM364B1 fan coil air handler. It steps down 208\/230V line power to the 24V control voltage that runs the thermostat, control board, relays, and contactor coil. Rated at 40VA, it delivers enough current to drive the full 24V control circuit without overheating. When a transformer fails, the entire low-voltage side goes dead: the thermostat screen blanks, the blower will not start, and no 24V is present at the control board. Common failure causes are a shorted thermostat wire, a stuck contactor, a power surge, or simple age-related winding breakdown. A blown internal fuse link or a burnt smell at the transformer is a clear sign of failure.\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\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e1172028\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\u003ePrimary Voltage\u003c\/td\u003e\n\u003ctd\u003e208\/230V\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\u003eFit\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 fit for the ICP WAHM364B1 fan coil air handler and shared-platform Tempstar, Heil, and Comfortmaker WAHM-series units that use the 208\/230V-to-24V 40VA control transformer. Always confirm your existing transformer is rated 40VA with 208\/230V primary and 24V secondary before installing.\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 verify zero voltage with a multimeter at both the line and 24V terminals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e - Remove the air handler service panel to expose the control compartment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e - Photograph all primary and secondary wire connections before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e - Label and disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the failed transformer from its mounting bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e - Mount the new transformer, reconnect primary to line voltage and secondary to the 24V control circuit exactly per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e - Restore power and confirm 24V across the secondary terminals and normal blower\/thermostat operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThermostat is blank or unresponsive with line power confirmed present\u003c\/li\u003e\n\u003cli\u003eNo 24V reading at the control board or transformer secondary\u003c\/li\u003e\n\u003cli\u003eBlower and controls completely dead while line voltage is good\u003c\/li\u003e\n\u003cli\u003eBurnt smell, discoloration, or a blown internal fuse link at the transformer\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":"ICP","offers":[{"title":"OEM","offer_id":63021618266483,"sku":"1172028","price":38.94,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047731118451,"sku":"1172028-GEN","price":29.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1172028_17742f89-0084-41af-b100-283e6134ef3a.jpg?v=1782896238","url":"https:\/\/nationalhvacparts.com\/products\/icp-transformer-for-wahm364b1-40va-208-230v-to-24v-step-down-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}