{"product_id":"917178a-nordyne-defrost-control-board","title":"917178A Nordyne Defrost Control Board","description":"\u003cp\u003e\u003c!-- rlb --\u003e\u003c\/p\u003e\n\u003ch1\u003e917178A Nordyne Defrost Control Board\u003c\/h1\u003e\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003e917178A is the factory-original defrost control board for Nordyne and private-label heat pump systems. It monitors coil and ambient temperatures, initiates the defrost sequence by energizing the reversing valve and compressor, and employs a built-in 5-minute time delay to prevent rapid cycling and ensure efficient frost removal.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"relative pb-6 w-full after:border-b after:border-stroke-300 after:w-full after:absolute after:mt-3\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eCross-Reference Part Numbers\u003c\/h2\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eOEM Part Number\u003c\/th\u003e\n\u003cth\u003eReplaces \/ Supersedes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e917178A\u003c\/td\u003e\n\u003ctd\u003eFactory OEM defrost control board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e917178\u003c\/td\u003e\n\u003ctd\u003eOriginal revision\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e917012\u003c\/td\u003e\n\u003ctd\u003eEarlier revision\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e621301\u003c\/td\u003e\n\u003ctd\u003eLegacy Nordyne defrost board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e621579\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e624519\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e624608\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e624626\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e624633\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e624656\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cspan\u003e\u003cem\u003eCross-reference data sourced from internal catalogs and H \u0026amp; S Mobile Home Supplies\u003c\/em\u003e\u003cspan class=\"mx-0.5 inline-block h-5 w-4 pb-1 align-middle\" data-copy=\"false\"\u003e\u003cbutton id=\":rfr:\" aria-expanded=\"false\" aria-controls=\":rfq:\" aria-label=\"Citation 2\" type=\"button\"\u003e2\u003c\/button\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eNordyne and OEM private-label heat pumps (Intertherm, Miller, Coleman, Frigidaire, Maytag)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eResidential split-system heat pumps requiring a dedicated defrost control module\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eReplaces single-stage defrost control boards in models originally using 917178, 917012 series parts\u003cspan class=\"mx-0.5 inline-block h-5 w-4 pb-1 align-middle\" data-copy=\"false\"\u003e\u003cbutton id=\":rfv:\" aria-expanded=\"false\" aria-controls=\":rfu:\" aria-label=\"Citation 4\" type=\"button\"\u003e4\u003c\/button\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eTechnician Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAlways disconnect all power and discharge capacitors before servicing the control board.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eUse an ESD wrist strap and handle the board by its edges to prevent static damage.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePhotograph or diagram existing wire connections and sensor locations before removal.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eInspect defrost termination thermostat and ambient sensor for correct placement and continuity.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eVerify dip-switch or jumper settings according to the unit’s service manual for defrost timing and temperature thresholds.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAfter installation, cycle the heat pump through cooling and heating modes to confirm normal operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eObserve the board’s LED flash codes during defrost initiation and termination; refer to the OEM manual for code definitions.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePerform multiple defrost cycles under controlled frost load to ensure reliable performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eAdditional Resources\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDownloadable OEM wiring diagram \u0026amp; installation manual (PDF)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePrintable cross-reference sheet covering Nordyne and private labels\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eStep-by-step video tutorial on defrost board replacement\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eReplacement defrost control kit for heat pumps. Includes built-in 5 minute time delay.\u003cbr\u003e\u003cbr\u003eReplaces 917012, 917178, 621301, 621579, 624519, 624608, 624626, 624633, 1084-83-4000B \u0026amp; 624656.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Quinn","offers":[{"title":"Default Title","offer_id":13270030595,"sku":"917178A","price":161.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1071\/8320\/files\/Screenshot_2026-03-02_120917.png?v=1772478609","url":"https:\/\/hvacpartstore.com\/products\/917178a-nordyne-defrost-control-board","provider":"HVACpartstore","version":"1.0","type":"link"}