{"product_id":"water-flow-switch","title":"Universal Pool \u0026 Spa Flow Switch - Heat Pumps, Chlorinators, Dosing Systems, etc - 3\/4\"","description":"\u003ch3\u003eUniversal Pool \u0026amp; Spa Flow Switch - Heat Pumps, Chlorinators, Dosing Systems, etc - 3\/4\"\u003c\/h3\u003e\n\u003cp\u003ePool and spa water flow switch with a 3\/4\" thread (approx 25mm), used as the original equipment flow switch by most heat pump manufacturers. Also fitted to chlorinator cell housings, acid and chlorine dosing systems, and other pool and spa equipment. Normally Open, closes on flow.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e\u003cstrong\u003ePhysically Stocked, unlike most \"drop-shipping\" websites.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e\u003cstrong\u003eShipped from VIC, NSW, WA, QLD\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- HASP-XREF-FLOW-3Q4 rev.7 --\u003e\n\u003ch3\u003eFault codes this part usually fixes\u003c\/h3\u003e\n\u003cp\u003eA failed flow switch is the most common cause of a flow fault on a heat pump that is otherwise plumbed and running correctly. Depending on the brand and controller, the same fault is displayed as:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eE3 \/ E03 \/ EE3 \/ ER3 \/ ERR 3 \/ ERR03 \/ Err 03 \/ Error 3 \/ Error 03\u003c\/strong\u003e — water flow fault, the near-universal code across imported heat pumps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eE6 \/ E06\u003c\/strong\u003e — used by some Madimack manuals for insufficient flow or excessive temperature differential\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\"Low Flow\", \"No Flow\", \"Water Flow Fault\", \"Check Flow\"\u003c\/strong\u003e — text-display controllers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTypical symptoms:\u003c\/strong\u003e the heater starts then shuts down after a minute or two, the unit will not start even though the filtration pump is running, heating cuts in and out, or the fault clears when you press on the paddle by hand. On a dosing system, the usual sign is that the pump will not dose at all even with the filtration running. More detail on our \u003ca href=\"https:\/\/heaterandspaparts.com.au\/pages\/error-3-for-pool-spa-heat-pumps\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eError 3 for Pool \u0026amp; Spa Heat Pumps\u003c\/a\u003e page.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBefore replacing the switch\u003c\/strong\u003e, rule out a dirty filter, a closed or incorrectly set valve, a failing filtration pump, air in the line, or a bypass opened too far. A flow switch that tests fine on the bench will still fault if the flow is not there.\u003c\/p\u003e\n\u003ch3\u003eUsed in\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAquark, AquaSolis, Aquatight, AstralPool, Australian Energy Systems (AES), CHR Heat Pumps, Chilli, Danfoss, Davey, Emaux, EvoHeat, Eziheat, Fairland, Fluidra, Garden PAC, Genesis, Grannus, Guardian, Hayward, HeatSeeker, Henden, Hurlcon, Hydro-Pro, Madimack, Midea, NCS, Neptune, Nova, Oasis, Pentair, PHNIX, Pool Set, Profacture, Raypak, Reltech, Rheem, SensaHeat, SpaNet, SpaPro, Sunlover, Sunrain, Swimmax, Theralux, Thermia, TiLab, Toyesi, Waterco, WWDG, Zealux, Zodiac, and many others.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommonly seen on these model families:\u003c\/strong\u003e Hayward HeatPro (HP50A, HP50HA, HP65A, HP50A1, HP70A1, HP50AEE, HP70AEE), Hayward Trevinium HP55TR \/ HP75TR, Hayward HP31005T; Pentair UltraTemp HX, HXi, VX and VXi; Zodiac Z550iQ and ZS500; Madimack Elite V3 \/ V4, InverEco, Eco, InverTITAN, GT and GT Freedom; EvoHeat DHP, Fusion, Force, CS and Inver; Eziheat Infinity, Serenity and Aquamini; Aquark Mr. Perfect; Aquatight; AstralPool and Viron Eco heat pumps; Sunlover, Waterco and Davey heat pumps; and the many rebadged imported units built on the same platform.\u003c\/p\u003e\n\u003ch3\u003eAlso used in dosing and sanitising equipment\u003c\/h3\u003e\n\u003cp\u003eOn a dosing system the paddle switch acts as the flow interlock — it confirms water is actually circulating before the peristaltic pump is allowed to inject acid or chlorine. A failed switch stops dosing entirely, which is the safe failure mode but leaves your water drifting. Commonly fitted to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfacture\u003c\/strong\u003e pHMate, pHMate Series 2, TuffChem and TuffChem TP100 dosing systems (Australian made)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePool Controls\u003c\/strong\u003e dosing systems, including those found in Endless® spas\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDavey \/ Henden\u003c\/strong\u003e Nipper chlorinator cell housings\u003c\/li\u003e\n\u003cli\u003eA wide range of other pool \u0026amp; spa equipment using a 3\/4\" threaded paddle switch\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Paddle \/ blade operated water flow switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical action:\u003c\/strong\u003e Normally Open (NO) — contacts close when flow moves the paddle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring:\u003c\/strong\u003e Two-wire, unpolarised dry contact\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitching voltage:\u003c\/strong\u003e 3V, 6V, 12V, 24V, 36V — rated range 3–100V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum current:\u003c\/strong\u003e 0.5A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum flow to actuate:\u003c\/strong\u003e 1 L\/min\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating temperature:\u003c\/strong\u003e -10°C to 100°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody material:\u003c\/strong\u003e Glass-filled nylon and POM (acetal)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 3\/4\" BSP — at this size BSP and NPT are effectively interchangeable in moulded plastic fittings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured thread diameter:\u003c\/strong\u003e approximately 25 mm across. Nominal spec is 26.4 mm, but moulded plastic threads read slightly under — this is normal and does not affect fitment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread pitch:\u003c\/strong\u003e 14 TPI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Inline, direction-sensitive\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePart numbers \u0026amp; cross references\u003c\/h3\u003e\n\u003cp\u003eReplaces the following manufacturer, distributor and OEM references where the thread, paddle length and electrical operation match:\u003c\/p\u003e\n\u003cdiv style=\"overflow-x: auto;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 12px 0;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 8px; border-bottom: 2px solid #E1E3E4; color: #1e2d7d;\"\u003eBrand\u003c\/th\u003e\n\u003cth style=\"text-align: left; padding: 8px; border-bottom: 2px solid #E1E3E4; color: #1e2d7d;\"\u003ePart number\u003c\/th\u003e\n\u003cth style=\"text-align: left; padding: 8px; border-bottom: 2px solid #E1E3E4; color: #1e2d7d;\"\u003eFits \/ notes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eAES \/ Australian Energy Systems\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003e040060600000\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eSold as the AES universal water flow switch; also retailed as an Astral heater water pressure switch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eAstralPool\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003e20000-360005, 83000068\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eAstral and Viron Eco heat pump range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eDavey\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003e16102-3SP, earlier 16102-2SP\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003ePaddle switch for Nipper chlorinator cell housings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eEvoHeat\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eSP-E83000012\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eDHP, Fusion, Force, CS and Inver series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eFairland\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003e040060600000, 040060620000\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eInverter heat pump range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eGarden PAC\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eGHD-151-1215, JR-B688\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eAll\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eHayward\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eHPX20000-360005, HPX20000360005, HPX517000-86201\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eHeatPro HP50A, HP50HA, HP65A, HP50A1, HP70A1, HP50AEE, HP70AEE; Trevinium HP55TR \/ HP75TR; HP31005T. Listed by some suppliers as a \"water pressure switch\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eMadimack\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eSP11006, MKL-151-91018\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eElite V3 \/ V4, InverEco, Eco, GT series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eRaypak\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003e018146F\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eAll\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eSensaPool \/ SensaHeat\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eSP-HPFLOW\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eAll\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eSpaNet\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eSN-HP-FLOW-SV\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eSpa heat pump flow switch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eZealux\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003e604766, JR-B688\u003c\/td\u003e\n\u003ctd style=\"padding-top: 8px; padding-right: 8px; padding-bottom: 8px; border-bottom: 1px solid rgb(225, 227, 228);\"\u003e All\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eZodiac \/ Fluidra\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eB0052400A\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eZ550iQ, ZS500\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eFactory \/ OEM\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eJR-B688, B688\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border-bottom: 1px solid #E1E3E4;\"\u003eBase OEM designation, appears under multiple rebadges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Manufacturers may use different plugs, wire lengths, paddle lengths or body revisions within the same equipment family. Compare against the original before ordering. As this is a two-wire unpolarised switch, the original plug can generally be transferred across.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAlso searched as:\u003c\/strong\u003e 20000360005, 20000 360005, 2000-36005, JR B688, B688.\u003c\/p\u003e\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal switch only — 0.5A maximum.\u003c\/strong\u003e This is a low-current control input to the heat pump or dosing controller board. It must never be wired to switch a pump, contactor, heating element or any other load directly. Doing so will weld or destroy the contacts immediately and is not covered by warranty.\u003c\/li\u003e\n\u003cli\u003eUniversal style: each manufacturer uses different plugs, so you may need to cut and join the two wires. Polarity does not matter.\u003c\/li\u003e\n\u003cli\u003eThe blue plastic shown in photos is only a thread protector and is not used in installation.\u003c\/li\u003e\n\u003cli\u003eEnsure correct orientation and water flow direction so the paddle engages properly.\u003c\/li\u003e\n\u003cli\u003eMost failures are caused by poor water balance, too much water flow, or bromine. The nylon and acetal body is chemically resistant to normal chlorinated pool water, but bromine and badly unbalanced water will attack it over time.\u003c\/li\u003e\n\u003cli\u003eEnsure heat pump water flow is restricted as per manufacturer's specs using a \u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/heat-pump-3-way-valve-installation-kit\" rel=\"noopener noreferrer\" target=\"_blank\"\u003ebypass valve setup like this\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eTest with a multimeter: Normally Open — should close when the paddle is engaged.\u003c\/li\u003e\n\u003cli\u003eMust be installed by a qualified person.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWarranty:\u003c\/strong\u003e 12 months. Excludes failures caused by excessive water flow or corrosive water.\u003c\/p\u003e\n\u003cp\u003eNot sure if it's the right part? Send us a photo of what you're replacing and we'll confirm it before you order.\u003c\/p\u003e","brand":"EvoHeat","offers":[{"title":"Default Title","offer_id":35762423857308,"sku":"20000-360005","price":82.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0372\/5253\/files\/universal-pool-spa-flow-switch-heat-pumps-chlorinators-dosing-systems-etc-3-4-481.webp?v=1784524687","url":"https:\/\/heaterandspaparts.com.au\/en-nz\/products\/water-flow-switch","provider":"Heater and Spa Parts","version":"1.0","type":"link"}