{"product_id":"vaillant-ecotec-plus-vuw-824-831-837-pro-24-28-flow-sensor-178988-genuine-part","title":"VAILLANT ECOTEC PLUS VUW 824 831 837 \u0026 PRO 24 28 FLOW SENSOR 178988 GENUINE PART","description":"\u003ch1 data-section-id=\"ziajll\" data-start=\"133\" data-end=\"163\"\u003e \u003cstrong\u003e\u003cspan class=\"ux-textspans ux-textspans--EMPHASIS ux-textspans--SUPERSCRIPT\"\u003e“\u003c\/span\u003e\u003cspan class=\"ux-textspans ux-textspans--ITALIC\"\u003e“FULLY REFURBISHED AND TESTED BY OUR ENGINEERS AND COME WITH 12 MONTH WARRANTY”\u003c\/span\u003e\u003cspan class=\"ux-textspans ux-textspans--EMPHASIS ux-textspans--SUPERSCRIPT\"\u003e”\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/h1\u003e\n\u003ch1 data-section-id=\"ziajll\" data-start=\"133\" data-end=\"163\"\u003e✅ What this part actually is\u003c\/h1\u003e\n\u003cul data-start=\"164\" data-end=\"293\"\u003e\n\u003cli data-section-id=\"1lbjc6b\" data-start=\"164\" data-end=\"207\"\u003e\u003cstrong data-start=\"166\" data-end=\"205\"\u003eFlow sensor \/ turbine (aqua sensor)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-section-id=\"e2jft9\" data-start=\"208\" data-end=\"254\"\u003eDetects\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"218\" data-end=\"252\"\u003ehot water demand (tap opening)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1qef6r3\" data-start=\"255\" data-end=\"293\"\u003eSends signal to PCB to fire boiler\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"295\" data-end=\"342\"\u003e👉 If faulty, boiler won’t detect flow properly\u003c\/p\u003e\n\u003chr data-start=\"344\" data-end=\"347\"\u003e\n\u003ch1 data-section-id=\"npxp2t\" data-start=\"349\" data-end=\"387\"\u003e✅ Confirmed compatible boiler models\u003c\/h1\u003e\n\u003ch2 data-section-id=\"1xfgk8s\" data-start=\"389\" data-end=\"429\"\u003e🔥 Vaillant ecoTEC Plus (major range)\u003c\/h2\u003e\n\u003cul data-start=\"430\" data-end=\"652\"\u003e\n\u003cli data-section-id=\"21m9s5\" data-start=\"430\" data-end=\"490\"\u003eecoTEC Plus\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"444\" data-end=\"451\"\u003e824\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(all variants 246\/3-5, 246\/5-5 etc.)\u003c\/li\u003e\n\u003cli data-section-id=\"1qbqt6e\" data-start=\"491\" data-end=\"514\"\u003eecoTEC Plus\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"505\" data-end=\"512\"\u003e825\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1659k9s\" data-start=\"515\" data-end=\"559\"\u003eecoTEC Plus\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"529\" data-end=\"536\"\u003e831\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(all R1–R5 variants)\u003c\/li\u003e\n\u003cli data-section-id=\"1skupbi\" data-start=\"560\" data-end=\"601\"\u003eecoTEC Plus\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"574\" data-end=\"599\"\u003e832 \/ 835 \/ 837 \/ 838\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"177nv9e\" data-start=\"602\" data-end=\"652\"\u003eecoTEC Plus\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"616\" data-end=\"650\"\u003e937 \/ 938 (VUI storage combis)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"654\" data-end=\"735\"\u003e👉 Covers most generations of ecoTEC Plus\u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"737\" data-end=\"740\"\u003e\n\u003ch2 data-section-id=\"1pv8cr2\" data-start=\"742\" data-end=\"767\"\u003e🔥 Vaillant ecoTEC Pro\u003c\/h2\u003e\n\u003cul data-start=\"768\" data-end=\"870\"\u003e\n\u003cli data-section-id=\"1ef24\" data-start=\"768\" data-end=\"804\"\u003eecoTEC Pro\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"781\" data-end=\"787\"\u003e24\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(all variants)\u003c\/li\u003e\n\u003cli data-section-id=\"ibzx6i\" data-start=\"805\" data-end=\"826\"\u003eecoTEC Pro\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"818\" data-end=\"824\"\u003e26\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"i86cl0\" data-start=\"827\" data-end=\"848\"\u003eecoTEC Pro\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"840\" data-end=\"846\"\u003e28\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"hrka3h\" data-start=\"849\" data-end=\"870\"\u003eecoTEC Pro\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"862\" data-end=\"868\"\u003e30\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"872\" data-end=\"949\"\u003e👉 Includes older and newer revisions\u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"951\" data-end=\"954\"\u003e\n\u003ch2 data-section-id=\"qli0x9\" data-start=\"956\" data-end=\"987\"\u003e🔥 Vaillant ecoTEC Exclusive\u003c\/h2\u003e\n\u003cul data-start=\"988\" data-end=\"1045\"\u003e\n\u003cli data-section-id=\"1u1onwk\" data-start=\"988\" data-end=\"1016\"\u003eecoTEC Exclusive\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"1007\" data-end=\"1014\"\u003e832\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1u8bwr2\" data-start=\"1017\" data-end=\"1045\"\u003eecoTEC Exclusive\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"1036\" data-end=\"1043\"\u003e838\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1047\" data-end=\"1050\"\u003e\n\u003ch2 data-section-id=\"bf00au\" data-start=\"1052\" data-end=\"1079\"\u003e🔥 Other ecoTEC variants\u003c\/h2\u003e\n\u003cul data-start=\"1080\" data-end=\"1234\"\u003e\n\u003cli data-section-id=\"11q4pzf\" data-start=\"1080\" data-end=\"1102\"\u003eVUW (combi) models\u003c\/li\u003e\n\u003cli data-section-id=\"rgn6cs\" data-start=\"1103\" data-end=\"1133\"\u003eVUI (storage combi) models\u003c\/li\u003e\n\u003cli data-section-id=\"1ajkcju\" data-start=\"1134\" data-end=\"1234\"\u003eSome regional condensing variants (Guernsey\/Jersey models)\u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1236\" data-end=\"1239\"\u003e\n\u003ch1 data-section-id=\"1vz2pay\" data-start=\"1241\" data-end=\"1258\"\u003e🧠 Key takeaway\u003c\/h1\u003e\n\u003cul data-start=\"1259\" data-end=\"1438\"\u003e\n\u003cli data-section-id=\"tvjgd\" data-start=\"1259\" data-end=\"1310\"\u003e\u003cstrong data-start=\"1261\" data-end=\"1310\"\u003e178988 = very common Vaillant DHW flow sensor\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-section-id=\"sinl55\" data-start=\"1311\" data-end=\"1386\"\u003eUsed mainly in:\n\u003cul data-start=\"1331\" data-end=\"1386\"\u003e\n\u003cli data-section-id=\"lbjw89\" data-start=\"1331\" data-end=\"1346\"\u003eecoTEC Plus\u003c\/li\u003e\n\u003cli data-section-id=\"118iplq\" data-start=\"1349\" data-end=\"1363\"\u003eecoTEC Pro\u003c\/li\u003e\n\u003cli data-section-id=\"1q9kbzx\" data-start=\"1366\" data-end=\"1386\"\u003eecoTEC Exclusive\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"wjkscj\" data-start=\"1387\" data-end=\"1438\"\u003eCovers\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"1396\" data-end=\"1436\"\u003edozens of models (especially combis)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1440\" data-end=\"1503\"\u003e👉 If your boiler is ecoTEC combi → high chance this is correct\u003c\/p\u003e\n\u003chr data-start=\"1505\" data-end=\"1508\"\u003e\n\u003ch1 data-section-id=\"1d9t6a9\" data-start=\"1510\" data-end=\"1548\"\u003e⚠️ Important (very common confusion)\u003c\/h1\u003e\n\u003cp data-start=\"1549\" data-end=\"1577\"\u003eThis is often mixed up with:\u003c\/p\u003e\n\u003cul data-start=\"1578\" data-end=\"1663\"\u003e\n\u003cli data-section-id=\"5s0dv0\" data-start=\"1578\" data-end=\"1620\"\u003e\n\u003cstrong data-start=\"1580\" data-end=\"1616\"\u003eNTC sensors (temperature probes)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e❌\u003c\/li\u003e\n\u003cli data-section-id=\"11u1vxm\" data-start=\"1621\" data-end=\"1663\"\u003e\n\u003cstrong data-start=\"1623\" data-end=\"1659\"\u003ePRVs (178985 \/ 178988 confusion)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e❌\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1665\" data-end=\"1764\"\u003e👉 This one is specifically:\u003cbr\u003e✔️\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"1697\" data-end=\"1732\"\u003eFlow detection (water movement)\u003c\/strong\u003e\u003cbr data-start=\"1732\" data-end=\"1735\"\u003eNOT temperature or pressure\u003c\/p\u003e\n\u003chr data-start=\"1766\" data-end=\"1769\"\u003e\n\u003ch1 data-section-id=\"8e2sdl\" data-start=\"1771\" data-end=\"1797\"\u003e🔧 Common fault symptoms\u003c\/h1\u003e\n\u003cul data-start=\"1798\" data-end=\"1924\"\u003e\n\u003cli data-section-id=\"1rxmyjd\" data-start=\"1798\" data-end=\"1829\"\u003eNo hot water when tap opens\u003c\/li\u003e\n\u003cli data-section-id=\"1bmdabv\" data-start=\"1830\" data-end=\"1860\"\u003eBoiler doesn’t fire on DHW\u003c\/li\u003e\n\u003cli data-section-id=\"104mmsx\" data-start=\"1861\" data-end=\"1887\"\u003eIntermittent hot water\u003c\/li\u003e\n\u003cli data-section-id=\"lclhag\" data-start=\"1888\" data-end=\"1924\"\u003eLow flow detection \/ error codes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1926\" data-end=\"1929\"\u003e\n\u003ch1 data-section-id=\"1xc5vzt\" data-start=\"1931\" data-end=\"1952\"\u003e👍 Practical advice\u003c\/h1\u003e\n\u003cp data-start=\"1953\" data-end=\"1970\"\u003eBefore replacing:\u003c\/p\u003e\n\u003cul data-start=\"1971\" data-end=\"2070\"\u003e\n\u003cli data-section-id=\"126yfjg\" data-start=\"1971\" data-end=\"2046\"\u003eCheck\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"1979\" data-end=\"2012\"\u003efilter + plate heat exchanger\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(blockages mimic sensor faults)\u003c\/li\u003e\n\u003cli data-section-id=\"1w9f8bs\" data-start=\"2047\" data-end=\"2070\"\u003eCheck wiring to PCB\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2072\" data-end=\"2128\"\u003e👉 These sensors do fail, but are\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"2106\" data-end=\"2128\"\u003eoften misdiagnosed\u003c\/strong\u003e\u003c\/p\u003e","brand":"VAILLANT","offers":[{"title":"Default Title","offer_id":57611490197878,"sku":null,"price":17.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0533\/0983\/3406\/files\/image5_1_d64a7e3c-a86e-4554-a3ba-3a9c2cc90be9.jpg?v=1775291112","url":"https:\/\/star-boiler-spares.com\/en-ie\/products\/vaillant-ecotec-plus-vuw-824-831-837-pro-24-28-flow-sensor-178988-genuine-part","provider":"Star boiler spares","version":"1.0","type":"link"}