{"product_id":"tempstar-control-board-for-t4a324gkd100-comfort-alert-diagnostics-module-ships-today","title":"Tempstar Control Board for T4A324GKD100 — Comfort Alert Diagnostics Module | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM Comfort Alert control board (part number 1177402) is the diagnostic and protection module for the Tempstar T4A324GKD100 condensing unit. The board continuously monitors compressor and system operation, detects fault conditions such as long run cycles, locked rotor, low voltage, and short cycling, and communicates the condition through an on-board diagnostic LED. When this board fails, the system may refuse to start, short-cycle, throw false fault codes, or lose compressor protection entirely — leaving the unit vulnerable to costly damage. Replacing it with the genuine OEM board restores factory diagnostics and the manufacturer's protection logic.\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\u003eComfort Alert Diagnostics Control 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\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eCompressor monitoring \u0026amp; fault diagnostics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eEngineered as a direct OEM fit for the Tempstar T4A324GKD100 condensing unit and shared across compatible ICP-family (Heil, Comfortmaker, Tempstar) platforms that use the Comfort Alert module. Always confirm the printed part number 1177402 against your existing board 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 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 to expose the control area.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and terminal connection before disconnecting anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Label and unplug the harness connections, release the mounting standoffs\/screws, and lift out the old Comfort Alert board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Seat the new board on the standoffs, secure it, and reconnect each lead exactly per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, confirm the diagnostic LED shows a normal status, and verify the unit starts and runs correctly.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSystem will not start or short-cycles repeatedly\u003c\/li\u003e\n\u003cli\u003eDiagnostic LED is dark, flashing fault codes, or behaving erratically\u003c\/li\u003e\n\u003cli\u003eFalse trip conditions with no real fault present\u003c\/li\u003e\n\u003cli\u003eLoss of compressor protection or intermittent operation\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":63021812973939,"sku":"1177402-GEN","price":249.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048436023667,"sku":"1177402","price":323.7,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-1177402_4fe5b285-e9da-4e5c-93b8-fd44d04da7d5.jpg?v=1782959520","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-control-board-for-t4a324gkd100-comfort-alert-diagnostics-module-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}