{"product_id":"tempstar-control-board-comfortalert-for-t4a342gkd200-diagnostic-defrost-board-ships-today","title":"Tempstar Control Board ComfortAlert for T4A342GKD200 — Diagnostic Defrost Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM ComfortAlert control board (part number 1177402) is the diagnostic defrost control for the Tempstar T4A342GKD200 heat pump. It governs the defrost cycle, monitors compressor health, and flashes fault codes through onboard LEDs to speed up troubleshooting. A failed board can leave the unit unable to defrost, short-cycling, locked out, or throwing erratic codes. Since it handles the 24V control logic, a bad board often mimics a compressor or motor failure even when those components are fine.\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\u003e1177402\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eComfortAlert Diagnostic Defrost Board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eTempstar (ICP \/ Heil)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Voltage\u003c\/td\u003e\n\u003ctd\u003e24V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eHeat Pump Condenser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eEngineered for the Tempstar T4A342GKD200 and shared across many ICP-family heat pumps (Tempstar, Heil, Comfortmaker) using the ComfortAlert platform. Confirm OEM number 1177402 against your existing board 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 disconnect and breaker, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condenser service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and connector before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Release the low- and line-voltage plugs, unclip the board from its standoffs, and lift it out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new 1177402 board and reconnect each harness exactly per your photos.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, check the diagnostic LEDs for a normal status, and verify a proper defrost and run cycle.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eUnit fails to enter or exit defrost mode\u003c\/li\u003e\n\u003cli\u003eFlashing or solid fault-code LEDs on the board\u003c\/li\u003e\n\u003cli\u003eCompressor lockout or repeated short-cycling\u003c\/li\u003e\n\u003cli\u003eNo 24V output to the contactor with good incoming power\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":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021811630451,"sku":"1177402-GEN","price":189.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048434352499,"sku":"1177402","price":245.7,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1177402_cf25a9fa-a0d5-4972-b2a9-2f83a2943f15.jpg?v=1782959481","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-control-board-comfortalert-for-t4a342gkd200-diagnostic-defrost-board-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}