The answer to 'sprinkler system brown patches' is that brown patches in your lawn are often caused by issues with your sprinkler system. Common causes include improper coverage, broken or clogged sprinkler heads, and imbalanced water distribution. These problems can lead to areas of your lawn not receiving enough water, causing the grass to turn brown and die.
To troubleshoot and fix the issue, you'll want to start by inspecting your sprinkler system. Check for any broken or clogged heads, and make sure the system is providing even coverage across your lawn. You may need to adjust the spray patterns or replace any damaged components. If the problem persists, it could be due to an underlying issue with your sprinkler's water pressure, timer, or other mechanical components. In these cases, it's best to call a professional landscaping or sprinkler repair service to diagnose and resolve the problem.