Troubleshooting and Clearing a Mainline Break (MB) Alert

Lance Elliott Updated May 7, 2026 1 min read

Update

Table of Contents

Possible Causes:Possible Fixes:To clear a Mainline Break from the controller: To clear a Mainline Break from WeatherTRAK Central:


If a mainline break has occurred, flow has exceeded the mainline break threshold and the controller will close the station valves.


Possible Causes:

  • Mainline break: An actual break in the mainline has occurred 
  • Stuck valve: A station valve is stuck on 
  • Programming error: The mainline break threshold is set too low 


Possible Fixes:


To clear a Mainline Break from the controller: 

1.  Turn the Upper Knob to view flow status.

2.  Press the * button to clear all flow alerts.


To clear a Mainline Break from WeatherTRAK Central:

1.  Hover over the Alerts tab and click on Alert List. A list of all active alerts will display.

2.  Place a checkmark next to the alert you would like to clear.

3.  Press the Clear Flow and Electrical Alerts button. A pop-up screen displays asking you to verify the change. Click Yes.

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