{"product_id":"tempstar-defrost-control-board-for-txh548gka200-oem-heat-pump-board-ships-today","title":"Tempstar Defrost Control Board for TXH548GKA200 — OEM Heat Pump Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis genuine OEM defrost control board (part number 1173636) is the brain of the Tempstar TXH548GKA200 heat pump's outdoor section. It monitors coil temperature and run time, then initiates and terminates the defrost cycle that clears frost from the outdoor coil in heating mode. It also sequences the reversing valve, condenser fan, and auxiliary heat during defrost. When this board fails, the heat pump can ice over solid, lose heating capacity, run continuous or never-ending defrost, or fail to switch between heating and cooling. Symptoms include a frosted outdoor coil that never clears, no defrost at all, the unit stuck in defrost, or erratic reversing-valve behavior.\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\u003e1173636\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eDefrost 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\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\u003eTimed\/demand defrost, reversing-valve \u0026amp; fan sequencing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eHeat Pump (outdoor unit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eEngineered as the factory-correct replacement for the Tempstar TXH548GKA200 heat pump and used across matching ICP-family (Heil, Comfortmaker, Tempstar) heat pumps. Match the board part number, terminal layout, and defrost timing-pin options to your original before installing.\u003c\/p\u003e\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect outdoor power and verify zero voltage with a multimeter before opening the control box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condenser service panel to reach the control board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and connector, and note the defrost timing-pin (jumper) position.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the connectors, release the board standoffs\/screws, and lift out the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board, set the defrost timing pin to match, and reconnect each wire\/connector per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, force a defrost cycle, and confirm the reversing valve, fan, and aux heat respond correctly.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOutdoor coil ices over and never defrosts in heating mode\u003c\/li\u003e\n\u003cli\u003eUnit stuck in continuous defrost or never enters defrost\u003c\/li\u003e\n\u003cli\u003eNo 24V output to the reversing valve or fan during defrost\u003c\/li\u003e\n\u003cli\u003eVisible burnt traces, scorched relays, or swollen components on the board\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":63021624721779,"sku":"1173636-GEN","price":189.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048449360243,"sku":"1173636","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-1173636_1102c43e-8850-4164-9a38-cd0fa7d86d87.jpg?v=1782960013","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-txh548gka200-oem-heat-pump-board-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}