{"product_id":"tempstar-control-board-for-t4a318gkd100-comfortalert-diagnostics-ships-today","title":"Tempstar Control Board for T4A318GKD100 — ComfortAlert Diagnostics | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM Tempstar Control Board (part number 1177402) is a ComfortAlert diagnostic module that monitors and protects the compressor in your T4A318GKD100 air conditioning system. It continuously evaluates compressor and system conditions and flashes fault codes for issues such as low voltage, locked rotor, open circuits, missing phases, and short cycling. A failed board can cause the system to not start, run continuously, trip on protection faults, or show erratic or absent diagnostic LED codes. The exact OEM module restores dependable compressor protection and accurate field diagnostics.\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\u003e1177402\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eComfortAlert Diagnostic 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\u003eControl Voltage\u003c\/td\u003e\n\u003ctd\u003e24V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\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\u003eEngineered as the factory-correct control board for the Tempstar T4A318GKD100 condensing unit. This OEM ICP\/Heil\/Tempstar family part fits the matching ComfortAlert-equipped models that originally shipped with part 1177402.\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 disconnect and breaker, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the control access panel on the condensing unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and terminal location before disconnecting anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Label and unplug the low-voltage and sensor leads, release the board standoffs\/mounting screws, and lift out the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board on the standoffs and reconnect each lead exactly per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, start the system, and confirm normal operation and a clear\/healthy diagnostic LED status.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCompressor will not start or short cycles repeatedly\u003c\/li\u003e\n\u003cli\u003ePersistent or false protection fault codes\u003c\/li\u003e\n\u003cli\u003eDiagnostic LED is dark, frozen, or flashing erratically\u003c\/li\u003e\n\u003cli\u003eVisible burn marks, corrosion, or swollen components on the board\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":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021818675571,"sku":"1177402-GEN","price":189.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048435859827,"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-furnace-1177402_8a4cb980-12fc-4ec6-b208-26b91011d873.jpg?v=1782959512","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-control-board-for-t4a318gkd100-comfortalert-diagnostics-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}