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"markdown": "[← Shutoff valve service hub](<https://mtnmanplumbing.com/services/shutoff-valves/?agentnet=md>) Sandy, Utah · Salt Lake Valley\n\nWhen you’re away\n\n# Automatic Water Shutoffs & Leak Detection\n\nUnderstand how Moen Flo and sensor-triggered systems detect leaks, close the water supply and fit into your home.\n\n- [All shutoff services](<https://mtnmanplumbing.com/services/shutoff-valves/?agentnet=md>)\n\n- [Sink, toilet & appliance valves](<https://mtnmanplumbing.com/services/shutoff-valves/fixture-shutoff-valves/?agentnet=md>)\n\n- [Main water shutoffs](<https://mtnmanplumbing.com/services/shutoff-valves/main-water-shutoff/?agentnet=md>)\n\n- [Automatic leak shutoffs](<https://mtnmanplumbing.com/services/shutoff-valves/automatic-water-shutoffs/?agentnet=md>)\n\nAutomatic water protection\n\n## Two ways to spot a leak.\n\nA motorized valve can stop incoming water when its system detects a leak—even while you are away. The detection method determines what the system watches.\n\nMeasures water moving through the home\n\n### Moen Flo\n\nFlo installs in the main water line and monitors flow, pressure and temperature. It learns usage patterns, runs leak checks and can close its built-in valve when it detects a potential leak. The app also lets you see water use and close the valve remotely.\n\nInstallation includes the correct pipe size, a nearby power supply and Wi-Fi setup. We locate it after the manual shutoff and pressure regulator so the home’s intended water use passes through it.\n\nRead more: [Moen: Flo water monitoring and automatic shutoff ↗](<https://shop.moen.com/products/flo-smart-water-monitor-and-shutoff>) · [Moen: Flo installation guide ↗](<https://assets.moen.com/shared/docs/instruction-sheets/ins11955b.pdf>)\n\nReacts to water where a sensor is placed\n\n### Sensor-triggered shutoffs\n\nSystems such as the Resideo L5 can close a motorized main valve when a connected cable or compatible paired detector senses a leak. Sensors can sit near a washer, water heater or other likely wet spot.\n\nSensor placement determines where the system can detect escaped water. We test the valve, the sensor connection and the alert setup together, then show you how to reopen or operate the valve manually.\n\nRead more: [Resideo: L5 Wi-Fi water shutoff instructions ↗](<https://customer.resideo.com/resources/Techlit/TechLitDocuments/33-00000s/33-00602.pdf>)\n\n### Start with the water you want protected.\n\nThe valve controls the branches downstream of it. We locate the house main, [pressure regulator](<https://mtnmanplumbing.com/services/pressure-prv/?agentnet=md>), outdoor branches and treatment equipment before choosing its position. A sensor beside the washer must sit where a leak will reach it; a flow monitor needs to recognize the household’s normal water use.\n\nClosing the valve stops incoming water. A leaking tank or pipe can still release the water it already holds.\n\n### Living with an automatic shutoff.\n\n### What happens when the Wi-Fi goes out?\n\nA powered Moen Flo keeps monitoring and stores data during an internet outage. Live phone alerts and remote control resume when the connection returns. That distinction matters when you are away: the device can be running while your phone cannot reach it.\n\n[Moen: operation without Wi-Fi ↗](<https://solutions.moen.com/Moen_Flo_Shutoff/Get_to_know_your_Product/Does_the_Moen_Flo_Shutoff_need_Wi-Fi%3F>)\n\n[Link to this answer](<https://mtnmanplumbing.com/services/shutoff-valves/automatic-water-shutoffs/#answer-what-happens-when-the-wi-fi-goes-out>)\n\n### What happens in a power outage?\n\nPlan power backup along with the valve. Moen’s optional Flo battery provides up to four hours of device power and is intended for indoor use. Remote access also needs the home’s internet equipment running.\n\nKeep the manual house shutoff accessible. Resideo’s L5 also has an emergency mechanical handle; operating that handle does not update the valve position shown in the app. We demonstrate the actual model’s manual control during setup.\n\n[Moen: battery backup ↗](<https://solutions.moen.com/Moen_Flo_Shutoff/Get_to_know_your_Product/Moen_Flo_Shutoff_Lithium_Ion_Battery_Backup>) · [Resideo L5: manual operation ↗](<https://customer.resideo.com/resources/Techlit/TechLitDocuments/33-00000s/33-00602.pdf>)\n\n[Link to this answer](<https://mtnmanplumbing.com/services/shutoff-valves/automatic-water-shutoffs/#answer-what-happens-in-a-power-outage>)\n\n### Will watering the yard or cleaning the softener set it off?\n\nThose uses belong in the setup. A [softener’s regeneration](<https://mtnmanplumbing.com/water-softeners/?agentnet=md>) is its automatic cleaning cycle, often scheduled overnight. Pool filling and irrigation can also look unusual to a flow monitor.\n\nFlo offers scheduled overrides for expected heavy use. Its Sleep mode disables alerts and automatic shutoff for the chosen period. Use the setting that fits the activity and restore normal protection afterward.\n\n[Moen: planned water-use settings ↗](<https://solutions.moen.com/Moen_Flo_Shutoff/Alerts%2C_Notifications%2C_and_Settings/How_To%3A_Add_a_Manual_Override>) · [Moen: Home, Away and Sleep modes ↗](<https://solutions.moen.com/Smart_Water_Security_Products/Help_Center/Flo_by_Moen_app/Mode_Change>)\n\n[Link to this answer](<https://mtnmanplumbing.com/services/shutoff-valves/automatic-water-shutoffs/#answer-will-watering-the-yard-or-cleaning-the-softener-set-it-off>)\n\n### The app reports a leak. What should I look for?\n\nLook for wet floors, dripping connections and water that keeps running after use. A [toilet refilling between flushes](<https://mtnmanplumbing.com/services/toilet-repair/running-toilet-repair/?agentnet=md>) can explain an alert without leaving a puddle. Check which sensor reported water before restoring a closed supply.\n\nWhen the cause stays hidden, [leak diagnosis](<https://mtnmanplumbing.com/leak-repair/?agentnet=md>) follows the water through the affected plumbing. Save the alert’s time and water-use history; they help narrow the search.\n\n[Link to this answer](<https://mtnmanplumbing.com/services/shutoff-valves/automatic-water-shutoffs/#answer-the-app-reports-a-leak-what-should-i-look-for>)\n\n### The handover should include a real demonstration.\n\nWe test closure, verify the alerts reach your phone, show you how to reopen and manually isolate the supply, and set the model’s maintenance cycle. Place sensors again after cleaning or moving an appliance, and check their operation on the maker’s schedule.\n\n[Ask about a smart shutoff ↗](<https://mtnmanplumbing.com/book-online/?agentnet=md>)\n\n**Keep the manual shutoff reachable.**\n\nA smart valve adds automatic protection. Knowing where the house main is still helps during service, a power problem or an urgent leak.\n\n[Find and understand your main valve →](<https://mtnmanplumbing.com/services/shutoff-valves/main-water-shutoff/?agentnet=md>)\n\nA few useful answers\n\n## Common questions.\n\n### Will an automatic shutoff work during a power or internet outage?\n\nPower keeps the motor and electronics working; internet access supports remote alerts and app control. Offline behavior and battery backup vary by product. We explain those details for the chosen device and show everyone in the home how to use the manual shutoff.\n\n[Link to this answer](<https://mtnmanplumbing.com/services/shutoff-valves/automatic-water-shutoffs/#answer-will-an-automatic-shutoff-work-during-a-power-or-internet-outage>)\n\n### Does Moen Flo keep working without Wi-Fi?\n\nWith power available, Flo continues monitoring and stores data during an internet outage. Live phone alerts and remote control need the internet connection.\n\n[Link to this answer](<https://mtnmanplumbing.com/services/shutoff-valves/automatic-water-shutoffs/#answer-does-moen-flo-keep-working-without-wi-fi>)\n\n### How do I plan power backup for a smart shutoff?\n\nPlan around the exact valve and power supply. Moen’s optional Flo battery provides up to four hours of device power and is intended for indoor use. Keep the manual house shutoff accessible.\n\n[Link to this answer](<https://mtnmanplumbing.com/services/shutoff-valves/automatic-water-shutoffs/#answer-how-do-i-plan-power-backup-for-a-smart-shutoff>)\n\n### Can a softener trigger a smart-shutoff alert?\n\nIts regeneration cycle uses water automatically, often overnight. Include that cycle and other planned heavy uses when setting up the monitor. Flo provides scheduled overrides for expected use.\n\n[Link to this answer](<https://mtnmanplumbing.com/services/shutoff-valves/automatic-water-shutoffs/#answer-can-a-softener-trigger-a-smart-shutoff-alert>)\n\n### Sources & public guide record\n\nMaintained by Mountain Man Plumbing · Utah Master Plumber, Lic. \\#12992295-5501.\n\n1. [Moen: Flo water monitoring and automatic shutoff ↗](<https://shop.moen.com/products/flo-smart-water-monitor-and-shutoff>)\n2. [Moen: Flo installation guide ↗](<https://assets.moen.com/shared/docs/instruction-sheets/ins11955b.pdf>)\n3. [Resideo: L5 Wi-Fi water shutoff instructions ↗](<https://customer.resideo.com/resources/Techlit/TechLitDocuments/33-00000s/33-00602.pdf>)\n4. [Moen: Flo operation without Wi-Fi ↗](<https://solutions.moen.com/Moen_Flo_Shutoff/Get_to_know_your_Product/Does_the_Moen_Flo_Shutoff_need_Wi-Fi%3F>)\n5. [Moen: Flo battery backup ↗](<https://solutions.moen.com/Moen_Flo_Shutoff/Get_to_know_your_Product/Moen_Flo_Shutoff_Lithium_Ion_Battery_Backup>)\n6. [Moen: planned water-use overrides ↗](<https://solutions.moen.com/Moen_Flo_Shutoff/Alerts%2C_Notifications%2C_and_Settings/How_To%3A_Add_a_Manual_Override>)\n7. [Moen: system modes ↗](<https://solutions.moen.com/Smart_Water_Security_Products/Help_Center/Flo_by_Moen_app/Mode_Change>)\n\nGuide version 2026.09.10.1 · References checked 2026-09-10.\n\n- [Public guide record · JSON](<https://mtnmanplumbing.com/pb/facts/shutoff-valves/guide.json>)\n\n- [Read as Markdown](<https://mtnmanplumbing.com/services/shutoff-valves/automatic-water-shutoffs/?agentnet=md>)\n\n## Need a dependable shutoff?\n\nTell us which valve needs help. We’ll explain the work and price before starting.\n\n[Book valve service ↗](<https://mtnmanplumbing.com/book-online/?agentnet=md>)\n\nConnected in your home\n\n## Keep following the plumbing.\n\n- [01 **Water shutoff valves →** Compare automatic protection with the home’s manual shutoffs.](<https://mtnmanplumbing.com/services/shutoff-valves/?agentnet=md>)\n- [02 **Running toilet repair →** A toilet that refills between uses can trigger an unusual-flow alert.](<https://mtnmanplumbing.com/services/toilet-repair/running-toilet-repair/?agentnet=md>)\n- [03 **Water softeners & sizing →** Include the softener’s regeneration cycle when setting up leak monitoring.](<https://mtnmanplumbing.com/water-softeners/?agentnet=md>)",
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