{"product_id":"tempstar-defrost-control-board-for-t4h436gka100-oem-heat-pump-board-ships-today","title":"Tempstar Defrost Control Board for T4H436GKA100 - OEM Heat Pump Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM defrost control board (OEM part #1173636) is the brain of the Tempstar T4H436GKA100 heat pump's defrost cycle. It monitors the outdoor coil temperature sensor and a time\/temperature defrost algorithm to decide when frost has built up on the outdoor coil, then commands the reversing valve, energizes the compressor, and de-energizes the outdoor fan to melt the ice. It also handles compressor anti-short-cycle timing and 24V control sequencing. When this board fails, the heat pump can ice over solid, fail to defrost, lock out the compressor, or run the auxiliary heat continuously and spike the electric bill.\u003c\/p\u003e\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\u003eControl Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eDefrost timing, reversing valve \u0026amp; compressor control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eT4H436GKA100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDesigned for the Tempstar T4H436GKA100 heat pump and used across the ICP family (Heil, Comfortmaker, Arcoaire) on units calling for the 1173636 defrost board. Confirm the board part number and connector layout against your existing board before ordering.\u003c\/p\u003e\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 condenser control-box panel to reach the board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e - Photograph every wire, connector, and the defrost timer pin setting before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e - Unplug the harness connectors and the coil sensor, release the board standoffs, and lift the old board out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e - Seat the new board on the standoffs, reconnect all connectors per your photos, and match the defrost timer pin setting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e - Restore power and force or observe a defrost cycle to confirm proper reversing valve and fan operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOutdoor coil ices over and never defrosts\u003c\/li\u003e\n\u003cli\u003eHeat pump stuck running auxiliary\/emergency heat\u003c\/li\u003e\n\u003cli\u003eCompressor or reversing valve fails to switch during defrost\u003c\/li\u003e\n\u003cli\u003eNo 24V output to the contactor on a call for heat or cool\u003c\/li\u003e\n\u003c\/ul\u003e\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":63021786759539,"sku":"1173636-GEN","price":165.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048444019059,"sku":"1173636","price":214.5,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1173636_2cc193c0-5979-44b2-b61e-cc9c4823b2a4.jpg?v=1782959825","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t4h436gka100-oem-heat-pump-board-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}