{"product_id":"tempstar-control-board-for-t4a342gkd100-comfortalert-diagnostics-ships-today","title":"Tempstar Control Board for T4A342GKD100 — ComfortAlert Diagnostics | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis genuine OEM ComfortAlert control board (part number 1177402) is the diagnostic and protection module for your Tempstar T4A342GKD100 condensing unit. It continuously monitors compressor operation — voltage, current draw, and run behavior — and flashes coded fault signals so a technician can pinpoint problems like a locked rotor, open circuit, low voltage, or short cycling without guesswork. When this board fails, the system may lose compressor protection, ignore safety lockouts, or refuse to run entirely. Installing the correct factory board restores both the diagnostics and the built-in safeguards that extend compressor life.\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\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\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eCompressor monitoring \u0026amp; fault diagnostics\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 factory replacement for the Tempstar T4A342GKD100. The 1177402 ComfortAlert module is used across compatible ICP-family Tempstar, Heil, and Comfortmaker single-stage condensers and heat pumps. Match the existing board's part number and connector layout 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 disconnect and breaker, then verify zero voltage with a multimeter before touching the control box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condenser service panel to reach the board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph all wire harnesses and plug locations before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the connectors, release the mounting standoffs or screws, and lift out the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Seat the new board on its standoffs and reconnect each harness exactly per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, call for cooling, and confirm the status LED shows normal operation with no fault codes.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNo diagnostic LED activity or a board that stays dark on power-up.\u003c\/li\u003e\n\u003cli\u003eCompressor won't start despite a good contactor, capacitor, and call for cooling.\u003c\/li\u003e\n\u003cli\u003ePersistent or nonsensical fault codes that don't match field readings.\u003c\/li\u003e\n\u003cli\u003eVisible scorching, swollen components, or a burnt-electronics smell 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. National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021811728755,"sku":"1177402-GEN","price":184.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048436646259,"sku":"1177402","price":240.44,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-1177402_0c6a0528-7cd1-466a-9ff2-430c353e405f.jpg?v=1782959544","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-control-board-for-t4a342gkd100-comfortalert-diagnostics-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}