{"product_id":"icp-heat-pump-defrost-control-board-for-wch5424gka200-24v-timed-demand-defrost-ships-today-1","title":"ICP Heat Pump Defrost Control Board for WCH5424GKA200 — 24V Timed\/Demand Defrost | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis is the OEM defrost control board (part number 1173636) for the ICP \/ Heil \/ Tempstar WCH5424GKA200 heat pump condensing unit. The defrost control board is the brain of the heat pump's defrost cycle. In heating mode, it monitors the outdoor coil temperature and accumulated run time, then initiates a defrost cycle that reverses the system to melt frost and ice off the outdoor coil. It coordinates the reversing valve, condenser fan, and auxiliary heat so the unit defrosts efficiently and resumes heating without damage. When this board fails, the heat pump may ice over completely, fail to defrost, lock into defrost, or stop heating altogether — all common cold-weather no-heat symptoms.\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\u003eICP \/ Heil \/ Tempstar\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 control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eEngineered as a direct OEM replacement for the ICP\/Heil\/Tempstar WCH5424GKA200 heat pump. The WCH5424 platform is shared across several ICP family brands (Heil, Tempstar, Comfortmaker), so this board fits many units built on the same chassis. Always confirm the part number on your existing board before ordering.\u003c\/p\u003e\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter before touching any wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the control panel cover on the condensing unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and terminal connection before disconnecting anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Label and disconnect the low-voltage and line-voltage leads, then unclip or unscrew the old defrost board from its standoffs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board on the standoffs and reconnect every wire exactly as shown in your photos, matching terminal designations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, run the unit in heating mode, and verify a normal defrost cycle initiates and terminates 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 gets stuck in defrost or cycles in and out of defrost rapidly\u003c\/li\u003e\n\u003cli\u003eNo heat output even though the compressor and fan run\u003c\/li\u003e\n\u003cli\u003eVisible burn marks, corrosion, or a chemical smell 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":"ICP","offers":[{"title":"OEM","offer_id":63027249512819,"sku":"1173636","price":155.94,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047603519859,"sku":"1173636-GEN","price":119.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1173636_77faaa10-73f2-46c7-9476-46f6522312c3.jpg?v=1782891434","url":"https:\/\/nationalhvacparts.com\/products\/icp-heat-pump-defrost-control-board-for-wch5424gka200-24v-timed-demand-defrost-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}