{"product_id":"tempstar-defrost-control-board-for-txh542gka200-heat-pump-timer-board-ships-today","title":"Tempstar Defrost Control Board for TXH542GKA200 — Heat Pump Timer Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM defrost control board (Part #1173636) is the brain of the defrost cycle on your Tempstar TXH542GKA200 heat pump. In heating mode the outdoor coil accumulates frost; this board monitors the defrost thermostat and run time, then temporarily reverses the unit to melt ice off the coil before returning to normal heating. It coordinates the reversing valve, condenser fan, and auxiliary heat during each cycle. When the board fails, the outdoor coil ices over and heating efficiency collapses — or the system gets stuck defrosting and blows cold air indoors. A blank or unlit board, no defrost activity, or a unit that never exits defrost are all classic symptoms.\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\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\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eHeat Pump Defrost Management\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VAC\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 OEM replacement for the Tempstar TXH542GKA200 heat pump. The 1173636 defrost board is used across multiple ICP-family heat pump models (Heil, Comfortmaker, Arcoaire). Match the part number and connector layout to your existing board 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the outdoor unit's electrical\/control panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and connector position before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the harnesses and release the board from its standoffs\/mounting screws.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Seat the new board, transfer any jumper\/dip-switch settings, and reconnect each harness per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and verify a normal heating call, then confirm a defrost cycle initiates and terminates correctly.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOutdoor coil freezes over and stays iced in heating mode.\u003c\/li\u003e\n\u003cli\u003eUnit never enters defrost, or gets stuck in defrost.\u003c\/li\u003e\n\u003cli\u003eCold air blows indoors during heating because the cycle won't end.\u003c\/li\u003e\n\u003cli\u003eBoard LEDs are dark or showing a fault\/error code.\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":63021624885619,"sku":"1173636-GEN","price":169.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048449261939,"sku":"1173636","price":220.94,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1173636_08b27292-b444-4320-87c9-009c787d0b82.jpg?v=1782960008","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-txh542gka200-heat-pump-timer-board-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}