{"product_id":"tempstar-comfort-alert-control-board-for-t4a448gkd100-oem-diagnostic-module-ships-today","title":"Tempstar Comfort Alert Control Board for T4A448GKD100 — OEM Diagnostic Module | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis is a genuine OEM Comfort Alert control board (part #1177402) for the Tempstar T4A448GKD100 condensing unit. The Comfort Alert module is a compressor diagnostic and protection board that continuously monitors compressor operation, voltage conditions, and run\/start performance. It provides fault-code diagnostics through an onboard LED, protecting the compressor from damaging conditions such as low voltage, locked rotor, open circuits, and short cycling. When this board fails or malfunctions, the system may lose protective shutoff features, throw erroneous fault codes, or fail to start the compressor entirely. A working Comfort Alert board extends compressor life and dramatically speeds up field troubleshooting.\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\u003eOEM Part 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 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\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eCompressor monitoring \u0026amp; protection\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\u003eDiagnostics\u003c\/td\u003e\n\u003ctd\u003eLED fault-code indication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eThis OEM control board is a direct-fit replacement for the Tempstar T4A448GKD100 air conditioning condensing unit and is used across the ICP family of single-stage condensers (Heil, Comfortmaker, and related brands) that employ the Comfort Alert diagnostic module. Confirm your existing board part number before ordering.\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 servicing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the electrical access panel to expose the control area.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph all low-voltage and sensing connections on the existing board before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the wiring harnesses, release the board from its standoffs or mounting clips, and lift it out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Seat the new board on the standoffs and reconnect each harness exactly as photographed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, call for cooling, and confirm the LED reports 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\u003eCompressor won't start despite a valid call for cooling\u003c\/li\u003e\n\u003cli\u003eErratic or constant fault-code flashing on the diagnostic LED\u003c\/li\u003e\n\u003cli\u003eLoss of compressor protection or repeated short cycling\u003c\/li\u003e\n\u003cli\u003eNo response from the board or a visibly burned\/corroded 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":63021804585331,"sku":"1177402-GEN","price":169.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048416461171,"sku":"1177402","price":220.94,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-1177402_4a523194-c306-4e70-9130-bc9c5314fd02.jpg?v=1782958683","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-comfort-alert-control-board-for-t4a448gkd100-oem-diagnostic-module-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}